ABCA7

UniProt ID: Q8IZY2
Organism: Homo sapiens
Review Status: COMPLETE
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Gene Description

ABCA7 encodes an ATP-binding cassette subfamily A lipid transporter that couples ATP hydrolysis to intramembrane phospholipid movement, with strong substrate support for phosphatidylserine, phosphatidylcholine, and lysophosphatidylcholine. The canonical protein localizes to plasma membrane, Golgi/endosomal membranes, ruffle membranes, and phagocytic cups in myeloid and other cells. ABCA7 binds apolipoprotein A-I and supports apolipoprotein-mediated phospholipid efflux, while cholesterol efflux and HDL assembly are more context-dependent. In macrophages and microglia, ABCA7 contributes to membrane trafficking, phagocytosis, apoptotic-cell engulfment, and amyloid-beta clearance/processing pathways relevant to Alzheimer disease risk.

Existing Annotations Review

GO Term Evidence Action Reason
GO:0042626 ATPase-coupled transmembrane transporter activity
IBA
GO_REF:0000033 		ACCEPT
Summary: This molecular-function annotation captures the core ABCA7 activity: ATP-coupled intramembrane phospholipid transport/floppase activity and apoA-I-associated phospholipid efflux.
Reason: The term aligns with direct biochemical evidence or well-supported cellular consequences of ABCA7 lipid transport and membrane-trafficking activity.
GO:0033344 cholesterol efflux
IBA
GO_REF:0000033 		KEEP AS NON CORE
Summary: ABCA7 can support apoA-I-associated cholesterol/HDL-like outputs in overexpression systems, but phospholipid/lysoPC transport is the better-supported core activity.
Reason: Retain the annotation as non-core because it is plausible or experimentally observed, but not the primary evolved molecular role of ABCA7.
GO:0033700 phospholipid efflux
IBA
GO_REF:0000033 		ACCEPT
Summary: This annotation is part of the core lipid transport, phospholipid efflux, or membrane-trafficking function of ABCA7.
Reason: The term aligns with direct biochemical evidence or well-supported cellular consequences of ABCA7 lipid transport and membrane-trafficking activity.
GO:0034188 apolipoprotein A-I receptor activity
IBA
GO_REF:0000033 		ACCEPT
Summary: This molecular-function annotation captures the core ABCA7 activity: ATP-coupled intramembrane phospholipid transport/floppase activity and apoA-I-associated phospholipid efflux.
Reason: The term aligns with direct biochemical evidence or well-supported cellular consequences of ABCA7 lipid transport and membrane-trafficking activity.
GO:0090554 phosphatidylcholine floppase activity
IBA
GO_REF:0000033 		ACCEPT
Summary: This molecular-function annotation captures the core ABCA7 activity: ATP-coupled intramembrane phospholipid transport/floppase activity and apoA-I-associated phospholipid efflux.
Reason: The term aligns with direct biochemical evidence or well-supported cellular consequences of ABCA7 lipid transport and membrane-trafficking activity.
GO:0090556 phosphatidylserine floppase activity
IBA
GO_REF:0000033 		ACCEPT
Summary: This molecular-function annotation captures the core ABCA7 activity: ATP-coupled intramembrane phospholipid transport/floppase activity and apoA-I-associated phospholipid efflux.
Reason: The term aligns with direct biochemical evidence or well-supported cellular consequences of ABCA7 lipid transport and membrane-trafficking activity.
GO:0000139 Golgi membrane
IEA
GO_REF:0000044 		ACCEPT
Summary: This location fits ABCA7 function as a multipass membrane lipid transporter active at plasma, Golgi/endosomal, ruffle, and phagocytic-cup membranes.
Reason: The term aligns with direct biochemical evidence or well-supported cellular consequences of ABCA7 lipid transport and membrane-trafficking activity.
GO:0001891 phagocytic cup
IEA
GO_REF:0000044 		ACCEPT
Summary: This location fits ABCA7 function as a multipass membrane lipid transporter active at plasma, Golgi/endosomal, ruffle, and phagocytic-cup membranes.
Reason: The term aligns with direct biochemical evidence or well-supported cellular consequences of ABCA7 lipid transport and membrane-trafficking activity.
GO:0005524 ATP binding
IEA
GO_REF:0000002 		ACCEPT
Summary: This molecular-function annotation captures the core ABCA7 activity: ATP-coupled intramembrane phospholipid transport/floppase activity and apoA-I-associated phospholipid efflux.
Reason: The term aligns with direct biochemical evidence or well-supported cellular consequences of ABCA7 lipid transport and membrane-trafficking activity.
GO:0005737 cytoplasm
IEA
GO_REF:0000120 		KEEP AS NON CORE
Summary: This annotation may reflect a valid cell-state, localization, or signaling consequence, but it is peripheral to ABCA7 core lipid transporter/phagocytic function.
Reason: Retain the annotation as non-core because it is plausible or experimentally observed, but not the primary evolved molecular role of ABCA7.
GO:0005783 endoplasmic reticulum
IEA
GO_REF:0000044 		KEEP AS NON CORE
Summary: This annotation may reflect a valid cell-state, localization, or signaling consequence, but it is peripheral to ABCA7 core lipid transporter/phagocytic function.
Reason: Retain the annotation as non-core because it is plausible or experimentally observed, but not the primary evolved molecular role of ABCA7.
GO:0005886 plasma membrane
IEA
GO_REF:0000120 		ACCEPT
Summary: This location fits ABCA7 function as a multipass membrane lipid transporter active at plasma, Golgi/endosomal, ruffle, and phagocytic-cup membranes.
Reason: The term aligns with direct biochemical evidence or well-supported cellular consequences of ABCA7 lipid transport and membrane-trafficking activity.
GO:0016020 membrane
IEA
GO_REF:0000002 		ACCEPT
Summary: This location fits ABCA7 function as a multipass membrane lipid transporter active at plasma, Golgi/endosomal, ruffle, and phagocytic-cup membranes.
Reason: The term aligns with direct biochemical evidence or well-supported cellular consequences of ABCA7 lipid transport and membrane-trafficking activity.
GO:0016887 ATP hydrolysis activity
IEA
GO_REF:0000002 		ACCEPT
Summary: This molecular-function annotation captures the core ABCA7 activity: ATP-coupled intramembrane phospholipid transport/floppase activity and apoA-I-associated phospholipid efflux.
Reason: The term aligns with direct biochemical evidence or well-supported cellular consequences of ABCA7 lipid transport and membrane-trafficking activity.
GO:0031901 early endosome membrane
IEA
GO_REF:0000044 		ACCEPT
Summary: This location fits ABCA7 function as a multipass membrane lipid transporter active at plasma, Golgi/endosomal, ruffle, and phagocytic-cup membranes.
Reason: The term aligns with direct biochemical evidence or well-supported cellular consequences of ABCA7 lipid transport and membrane-trafficking activity.
GO:0032587 ruffle membrane
IEA
GO_REF:0000044 		ACCEPT
Summary: This location fits ABCA7 function as a multipass membrane lipid transporter active at plasma, Golgi/endosomal, ruffle, and phagocytic-cup membranes.
Reason: The term aligns with direct biochemical evidence or well-supported cellular consequences of ABCA7 lipid transport and membrane-trafficking activity.
GO:0033344 cholesterol efflux
IEA
GO_REF:0000117 		KEEP AS NON CORE
Summary: ABCA7 can support apoA-I-associated cholesterol/HDL-like outputs in overexpression systems, but phospholipid/lysoPC transport is the better-supported core activity.
Reason: Retain the annotation as non-core because it is plausible or experimentally observed, but not the primary evolved molecular role of ABCA7.
GO:0033700 phospholipid efflux
IEA
GO_REF:0000117 		ACCEPT
Summary: This annotation is part of the core lipid transport, phospholipid efflux, or membrane-trafficking function of ABCA7.
Reason: The term aligns with direct biochemical evidence or well-supported cellular consequences of ABCA7 lipid transport and membrane-trafficking activity.
GO:0034188 apolipoprotein A-I receptor activity
IEA
GO_REF:0000117 		ACCEPT
Summary: This molecular-function annotation captures the core ABCA7 activity: ATP-coupled intramembrane phospholipid transport/floppase activity and apoA-I-associated phospholipid efflux.
Reason: The term aligns with direct biochemical evidence or well-supported cellular consequences of ABCA7 lipid transport and membrane-trafficking activity.
GO:0034205 amyloid-beta formation
IEA
GO_REF:0000117 		MODIFY
Summary: ABCA7 loss increases APP endocytosis and amyloid-beta production, so the evidence supports regulation, especially negative regulation by functional ABCA7, rather than simple involvement in amyloid-beta formation.
Reason: Use directional regulation terms to avoid implying ABCA7 is a positive component of amyloid-beta formation.
GO:0055085 transmembrane transport
IEA
GO_REF:0000002 		ACCEPT
Summary: This annotation is part of the core lipid transport, phospholipid efflux, or membrane-trafficking function of ABCA7.
Reason: The term aligns with direct biochemical evidence or well-supported cellular consequences of ABCA7 lipid transport and membrane-trafficking activity.
GO:0090554 phosphatidylcholine floppase activity
IEA
GO_REF:0000116 		ACCEPT
Summary: This molecular-function annotation captures the core ABCA7 activity: ATP-coupled intramembrane phospholipid transport/floppase activity and apoA-I-associated phospholipid efflux.
Reason: The term aligns with direct biochemical evidence or well-supported cellular consequences of ABCA7 lipid transport and membrane-trafficking activity.
GO:0090556 phosphatidylserine floppase activity
IEA
GO_REF:0000116 		ACCEPT
Summary: This molecular-function annotation captures the core ABCA7 activity: ATP-coupled intramembrane phospholipid transport/floppase activity and apoA-I-associated phospholipid efflux.
Reason: The term aligns with direct biochemical evidence or well-supported cellular consequences of ABCA7 lipid transport and membrane-trafficking activity.
GO:0140326 ATPase-coupled intramembrane lipid carrier activity
IEA
GO_REF:0000003 		ACCEPT
Summary: This molecular-function annotation captures the core ABCA7 activity: ATP-coupled intramembrane phospholipid transport/floppase activity and apoA-I-associated phospholipid efflux.
Reason: The term aligns with direct biochemical evidence or well-supported cellular consequences of ABCA7 lipid transport and membrane-trafficking activity.
GO:0140328 floppase activity
IEA
GO_REF:0000117 		ACCEPT
Summary: This molecular-function annotation captures the core ABCA7 activity: ATP-coupled intramembrane phospholipid transport/floppase activity and apoA-I-associated phospholipid efflux.
Reason: The term aligns with direct biochemical evidence or well-supported cellular consequences of ABCA7 lipid transport and membrane-trafficking activity.
GO:0140359 ABC-type transporter activity
IEA
GO_REF:0000002 		ACCEPT
Summary: This molecular-function annotation captures the core ABCA7 activity: ATP-coupled intramembrane phospholipid transport/floppase activity and apoA-I-associated phospholipid efflux.
Reason: The term aligns with direct biochemical evidence or well-supported cellular consequences of ABCA7 lipid transport and membrane-trafficking activity.
GO:1902991 regulation of amyloid precursor protein catabolic process
IEA
GO_REF:0000117 		ACCEPT
Summary: ABCA7 loss-of-function data support a role in regulating APP endocytosis/processing and limiting amyloid-beta formation.
Reason: The term aligns with direct biochemical evidence or well-supported cellular consequences of ABCA7 lipid transport and membrane-trafficking activity.
GO:0005515 protein binding
IPI
PMID:36115835
Quantitative fragmentomics allow affinity mapping of interac... 		MARK AS OVER ANNOTATED
Summary: The PDZ/motif interaction evidence is real but generic protein binding is not informative for ABCA7 core biology.
Reason: ABCA7 function is better captured by ATP-coupled lipid carrier/floppase activity, apoA-I receptor activity, and phagocytic/endocytic lipid-trafficking processes.
GO:0006869 lipid transport
TAS
Reactome:R-HSA-1369062 		ACCEPT
Summary: This annotation is part of the core lipid transport, phospholipid efflux, or membrane-trafficking function of ABCA7.
Reason: The term aligns with direct biochemical evidence or well-supported cellular consequences of ABCA7 lipid transport and membrane-trafficking activity.
GO:0033344 cholesterol efflux
IGI
PMID:28373057
Lysophosphatidylcholine export by human ABCA7. 		KEEP AS NON CORE
Summary: ABCA7 can support apoA-I-associated cholesterol/HDL-like outputs in overexpression systems, but phospholipid/lysoPC transport is the better-supported core activity.
Reason: Retain the annotation as non-core because it is plausible or experimentally observed, but not the primary evolved molecular role of ABCA7.
GO:0120014 phospholipid transfer activity
IGI
PMID:28373057
Lysophosphatidylcholine export by human ABCA7. 		ACCEPT
Summary: This molecular-function annotation captures the core ABCA7 activity: ATP-coupled intramembrane phospholipid transport/floppase activity and apoA-I-associated phospholipid efflux.
Reason: The term aligns with direct biochemical evidence or well-supported cellular consequences of ABCA7 lipid transport and membrane-trafficking activity.
GO:0140326 ATPase-coupled intramembrane lipid carrier activity
IDA
PMID:28373057
Lysophosphatidylcholine export by human ABCA7. 		ACCEPT
Summary: This molecular-function annotation captures the core ABCA7 activity: ATP-coupled intramembrane phospholipid transport/floppase activity and apoA-I-associated phospholipid efflux.
Reason: The term aligns with direct biochemical evidence or well-supported cellular consequences of ABCA7 lipid transport and membrane-trafficking activity.
GO:0120014 phospholipid transfer activity
TAS
Reactome:R-HSA-382553 		ACCEPT
Summary: This molecular-function annotation captures the core ABCA7 activity: ATP-coupled intramembrane phospholipid transport/floppase activity and apoA-I-associated phospholipid efflux.
Reason: The term aligns with direct biochemical evidence or well-supported cellular consequences of ABCA7 lipid transport and membrane-trafficking activity.
GO:0005794 Golgi apparatus
IDA
GO_REF:0000052 		ACCEPT
Summary: This location fits ABCA7 function as a multipass membrane lipid transporter active at plasma, Golgi/endosomal, ruffle, and phagocytic-cup membranes.
Reason: The term aligns with direct biochemical evidence or well-supported cellular consequences of ABCA7 lipid transport and membrane-trafficking activity.
GO:0005886 plasma membrane
IDA
GO_REF:0000052 		ACCEPT
Summary: This location fits ABCA7 function as a multipass membrane lipid transporter active at plasma, Golgi/endosomal, ruffle, and phagocytic-cup membranes.
Reason: The term aligns with direct biochemical evidence or well-supported cellular consequences of ABCA7 lipid transport and membrane-trafficking activity.
GO:0030054 cell junction
IDA
GO_REF:0000052 		KEEP AS NON CORE
Summary: This annotation may reflect a valid cell-state, localization, or signaling consequence, but it is peripheral to ABCA7 core lipid transporter/phagocytic function.
Reason: Retain the annotation as non-core because it is plausible or experimentally observed, but not the primary evolved molecular role of ABCA7.
GO:0000139 Golgi membrane
ISS
GO_REF:0000024 		ACCEPT
Summary: This location fits ABCA7 function as a multipass membrane lipid transporter active at plasma, Golgi/endosomal, ruffle, and phagocytic-cup membranes.
Reason: The term aligns with direct biochemical evidence or well-supported cellular consequences of ABCA7 lipid transport and membrane-trafficking activity.
GO:0005737 cytoplasm
ISS
GO_REF:0000024 		KEEP AS NON CORE
Summary: This annotation may reflect a valid cell-state, localization, or signaling consequence, but it is peripheral to ABCA7 core lipid transporter/phagocytic function.
Reason: Retain the annotation as non-core because it is plausible or experimentally observed, but not the primary evolved molecular role of ABCA7.
GO:0005737 cytoplasm
EXP
PMID:14592415
Posttranscriptional regulation of human ABCA7 and its functi... 		KEEP AS NON CORE
Summary: This annotation may reflect a valid cell-state, localization, or signaling consequence, but it is peripheral to ABCA7 core lipid transporter/phagocytic function.
Reason: Retain the annotation as non-core because it is plausible or experimentally observed, but not the primary evolved molecular role of ABCA7.
GO:0005783 endoplasmic reticulum
EXP
PMID:14592415
Posttranscriptional regulation of human ABCA7 and its functi... 		KEEP AS NON CORE
Summary: This annotation may reflect a valid cell-state, localization, or signaling consequence, but it is peripheral to ABCA7 core lipid transporter/phagocytic function.
Reason: Retain the annotation as non-core because it is plausible or experimentally observed, but not the primary evolved molecular role of ABCA7.
GO:0005886 plasma membrane
EXP
PMID:12917409
ATP-binding cassette transporter A7 (ABCA7) binds apolipopro... 		ACCEPT
Summary: This location fits ABCA7 function as a multipass membrane lipid transporter active at plasma, Golgi/endosomal, ruffle, and phagocytic-cup membranes.
Reason: The term aligns with direct biochemical evidence or well-supported cellular consequences of ABCA7 lipid transport and membrane-trafficking activity.
GO:0005886 plasma membrane
EXP
PMID:14592415
Posttranscriptional regulation of human ABCA7 and its functi... 		ACCEPT
Summary: This location fits ABCA7 function as a multipass membrane lipid transporter active at plasma, Golgi/endosomal, ruffle, and phagocytic-cup membranes.
Reason: The term aligns with direct biochemical evidence or well-supported cellular consequences of ABCA7 lipid transport and membrane-trafficking activity.
GO:0031901 early endosome membrane
ISS
GO_REF:0000024 		ACCEPT
Summary: This location fits ABCA7 function as a multipass membrane lipid transporter active at plasma, Golgi/endosomal, ruffle, and phagocytic-cup membranes.
Reason: The term aligns with direct biochemical evidence or well-supported cellular consequences of ABCA7 lipid transport and membrane-trafficking activity.
GO:0140326 ATPase-coupled intramembrane lipid carrier activity
EXP
PMID:24097981
Differential phospholipid substrates and directional transpo... 		ACCEPT
Summary: This molecular-function annotation captures the core ABCA7 activity: ATP-coupled intramembrane phospholipid transport/floppase activity and apoA-I-associated phospholipid efflux.
Reason: The term aligns with direct biochemical evidence or well-supported cellular consequences of ABCA7 lipid transport and membrane-trafficking activity.
GO:0001891 phagocytic cup
ISS
GO_REF:0000024 		ACCEPT
Summary: This location fits ABCA7 function as a multipass membrane lipid transporter active at plasma, Golgi/endosomal, ruffle, and phagocytic-cup membranes.
Reason: The term aligns with direct biochemical evidence or well-supported cellular consequences of ABCA7 lipid transport and membrane-trafficking activity.
GO:0032587 ruffle membrane
ISS
GO_REF:0000024 		ACCEPT
Summary: This location fits ABCA7 function as a multipass membrane lipid transporter active at plasma, Golgi/endosomal, ruffle, and phagocytic-cup membranes.
Reason: The term aligns with direct biochemical evidence or well-supported cellular consequences of ABCA7 lipid transport and membrane-trafficking activity.
GO:0005886 plasma membrane
IDA
PMID:28373057
Lysophosphatidylcholine export by human ABCA7. 		ACCEPT
Summary: This location fits ABCA7 function as a multipass membrane lipid transporter active at plasma, Golgi/endosomal, ruffle, and phagocytic-cup membranes.
Reason: The term aligns with direct biochemical evidence or well-supported cellular consequences of ABCA7 lipid transport and membrane-trafficking activity.
GO:0008542 visual learning
ISS
GO_REF:0000024 		KEEP AS NON CORE
Summary: Learning and memory phenotypes are downstream organismal consequences, not direct ABCA7 molecular functions.
Reason: Retain the annotation as non-core because it is plausible or experimentally observed, but not the primary evolved molecular role of ABCA7.
GO:0019216 regulation of lipid metabolic process
ISS
GO_REF:0000024 		ACCEPT
Summary: This annotation is part of the core lipid transport, phospholipid efflux, or membrane-trafficking function of ABCA7.
Reason: The term aligns with direct biochemical evidence or well-supported cellular consequences of ABCA7 lipid transport and membrane-trafficking activity.
GO:0033700 phospholipid efflux
IGI
PMID:28373057
Lysophosphatidylcholine export by human ABCA7. 		ACCEPT
Summary: This annotation is part of the core lipid transport, phospholipid efflux, or membrane-trafficking function of ABCA7.
Reason: The term aligns with direct biochemical evidence or well-supported cellular consequences of ABCA7 lipid transport and membrane-trafficking activity.
GO:0043409 negative regulation of MAPK cascade
ISS
GO_REF:0000024 		KEEP AS NON CORE
Summary: This annotation may reflect a valid cell-state, localization, or signaling consequence, but it is peripheral to ABCA7 core lipid transporter/phagocytic function.
Reason: Retain the annotation as non-core because it is plausible or experimentally observed, but not the primary evolved molecular role of ABCA7.
GO:1902430 negative regulation of amyloid-beta formation
ISS
GO_REF:0000024 		ACCEPT
Summary: ABCA7 loss-of-function data support a role in regulating APP endocytosis/processing and limiting amyloid-beta formation.
Reason: The term aligns with direct biochemical evidence or well-supported cellular consequences of ABCA7 lipid transport and membrane-trafficking activity.
GO:1903898 negative regulation of PERK-mediated unfolded protein response
ISS
GO_REF:0000024 		KEEP AS NON CORE
Summary: This annotation may reflect a valid cell-state, localization, or signaling consequence, but it is peripheral to ABCA7 core lipid transporter/phagocytic function.
Reason: Retain the annotation as non-core because it is plausible or experimentally observed, but not the primary evolved molecular role of ABCA7.
GO:0090554 phosphatidylcholine floppase activity
IDA
PMID:24097981
Differential phospholipid substrates and directional transpo... 		ACCEPT
Summary: This molecular-function annotation captures the core ABCA7 activity: ATP-coupled intramembrane phospholipid transport/floppase activity and apoA-I-associated phospholipid efflux.
Reason: The term aligns with direct biochemical evidence or well-supported cellular consequences of ABCA7 lipid transport and membrane-trafficking activity.
GO:0090556 phosphatidylserine floppase activity
IDA
PMID:24097981
Differential phospholipid substrates and directional transpo... 		ACCEPT
Summary: This molecular-function annotation captures the core ABCA7 activity: ATP-coupled intramembrane phospholipid transport/floppase activity and apoA-I-associated phospholipid efflux.
Reason: The term aligns with direct biochemical evidence or well-supported cellular consequences of ABCA7 lipid transport and membrane-trafficking activity.
GO:1900223 positive regulation of amyloid-beta clearance
ISS
GO_REF:0000024 		ACCEPT
Summary: This process is consistent with ABCA7-dependent membrane trafficking and phagocytic cup biology in macrophage/microglial contexts.
Reason: The term aligns with direct biochemical evidence or well-supported cellular consequences of ABCA7 lipid transport and membrane-trafficking activity.
GO:0140328 floppase activity
IDA
PMID:24097981
Differential phospholipid substrates and directional transpo... 		ACCEPT
Summary: This molecular-function annotation captures the core ABCA7 activity: ATP-coupled intramembrane phospholipid transport/floppase activity and apoA-I-associated phospholipid efflux.
Reason: The term aligns with direct biochemical evidence or well-supported cellular consequences of ABCA7 lipid transport and membrane-trafficking activity.
GO:0044857 plasma membrane raft organization
ISS
GO_REF:0000024 		KEEP AS NON CORE
Summary: This annotation may reflect a valid cell-state, localization, or signaling consequence, but it is peripheral to ABCA7 core lipid transporter/phagocytic function.
Reason: Retain the annotation as non-core because it is plausible or experimentally observed, but not the primary evolved molecular role of ABCA7.
GO:2000010 positive regulation of protein localization to cell surface
ISS
GO_REF:0000024 		KEEP AS NON CORE
Summary: This annotation may reflect a valid cell-state, localization, or signaling consequence, but it is peripheral to ABCA7 core lipid transporter/phagocytic function.
Reason: Retain the annotation as non-core because it is plausible or experimentally observed, but not the primary evolved molecular role of ABCA7.
GO:0097386 glial cell projection
ISS
GO_REF:0000024 		KEEP AS NON CORE
Summary: This annotation may reflect a valid cell-state, localization, or signaling consequence, but it is peripheral to ABCA7 core lipid transporter/phagocytic function.
Reason: Retain the annotation as non-core because it is plausible or experimentally observed, but not the primary evolved molecular role of ABCA7.
GO:0150094 amyloid-beta clearance by cellular catabolic process
ISS
GO_REF:0000024 		ACCEPT
Summary: This process is consistent with ABCA7-dependent membrane trafficking and phagocytic cup biology in macrophage/microglial contexts.
Reason: The term aligns with direct biochemical evidence or well-supported cellular consequences of ABCA7 lipid transport and membrane-trafficking activity.
GO:0034205 amyloid-beta formation
IMP
PMID:26260791
ATP-binding cassette transporter A7 (ABCA7) loss of function... 		MODIFY
Summary: ABCA7 loss increases APP endocytosis and amyloid-beta production, so the evidence supports regulation, especially negative regulation by functional ABCA7, rather than simple involvement in amyloid-beta formation.
Reason: Use directional regulation terms to avoid implying ABCA7 is a positive component of amyloid-beta formation.
GO:0045806 negative regulation of endocytosis
ISS
GO_REF:0000024 		ACCEPT
Summary: This process is consistent with ABCA7-dependent membrane trafficking and phagocytic cup biology in macrophage/microglial contexts.
Reason: The term aligns with direct biochemical evidence or well-supported cellular consequences of ABCA7 lipid transport and membrane-trafficking activity.
GO:1902991 regulation of amyloid precursor protein catabolic process
IMP
PMID:26260791
ATP-binding cassette transporter A7 (ABCA7) loss of function... 		ACCEPT
Summary: ABCA7 loss-of-function data support a role in regulating APP endocytosis/processing and limiting amyloid-beta formation.
Reason: The term aligns with direct biochemical evidence or well-supported cellular consequences of ABCA7 lipid transport and membrane-trafficking activity.
GO:0045332 phospholipid translocation
IDA
PMID:24097981
Differential phospholipid substrates and directional transpo... 		ACCEPT
Summary: This annotation is part of the core lipid transport, phospholipid efflux, or membrane-trafficking function of ABCA7.
Reason: The term aligns with direct biochemical evidence or well-supported cellular consequences of ABCA7 lipid transport and membrane-trafficking activity.
GO:0007613 memory
ISS
GO_REF:0000024 		KEEP AS NON CORE
Summary: Learning and memory phenotypes are downstream organismal consequences, not direct ABCA7 molecular functions.
Reason: Retain the annotation as non-core because it is plausible or experimentally observed, but not the primary evolved molecular role of ABCA7.
GO:0009986 cell surface
ISS
GO_REF:0000024 		ACCEPT
Summary: This location fits ABCA7 function as a multipass membrane lipid transporter active at plasma, Golgi/endosomal, ruffle, and phagocytic-cup membranes.
Reason: The term aligns with direct biochemical evidence or well-supported cellular consequences of ABCA7 lipid transport and membrane-trafficking activity.
GO:0010875 positive regulation of cholesterol efflux
ISS
GO_REF:0000024 		KEEP AS NON CORE
Summary: ABCA7 can support apoA-I-associated cholesterol/HDL-like outputs in overexpression systems, but phospholipid/lysoPC transport is the better-supported core activity.
Reason: Retain the annotation as non-core because it is plausible or experimentally observed, but not the primary evolved molecular role of ABCA7.
GO:0034504 protein localization to nucleus
ISS
GO_REF:0000024 		MARK AS OVER ANNOTATED
Summary: Protein localization to nucleus is not a clear ABCA7 core function and appears to be a downstream or indirect inference.
Reason: For a multipass membrane lipid transporter, nuclear protein-localization terms are not supported as a direct molecular function from the available evidence.
GO:0042985 negative regulation of amyloid precursor protein biosynthetic process
ISS
GO_REF:0000024 		MODIFY
Summary: ABCA7 affects APP processing and amyloid-beta output, but the available evidence is about APP catabolic/endocytic processing rather than APP biosynthesis.
Reason: Represent the biology with APP catabolic-process and amyloid-beta formation regulation terms instead of APP biosynthesis.
GO:0050766 positive regulation of phagocytosis
ISS
GO_REF:0000024 		ACCEPT
Summary: This process is consistent with ABCA7-dependent membrane trafficking and phagocytic cup biology in macrophage/microglial contexts.
Reason: The term aligns with direct biochemical evidence or well-supported cellular consequences of ABCA7 lipid transport and membrane-trafficking activity.
GO:0070374 positive regulation of ERK1 and ERK2 cascade
ISS
GO_REF:0000024 		KEEP AS NON CORE
Summary: This annotation may reflect a valid cell-state, localization, or signaling consequence, but it is peripheral to ABCA7 core lipid transporter/phagocytic function.
Reason: Retain the annotation as non-core because it is plausible or experimentally observed, but not the primary evolved molecular role of ABCA7.
GO:1901076 positive regulation of engulfment of apoptotic cell
ISS
GO_REF:0000024 		ACCEPT
Summary: This process is consistent with ABCA7-dependent membrane trafficking and phagocytic cup biology in macrophage/microglial contexts.
Reason: The term aligns with direct biochemical evidence or well-supported cellular consequences of ABCA7 lipid transport and membrane-trafficking activity.
GO:1902995 positive regulation of phospholipid efflux
ISS
GO_REF:0000024 		ACCEPT
Summary: This annotation is part of the core lipid transport, phospholipid efflux, or membrane-trafficking function of ABCA7.
Reason: The term aligns with direct biochemical evidence or well-supported cellular consequences of ABCA7 lipid transport and membrane-trafficking activity.
GO:0005886 plasma membrane
IDA
PMID:14570867
Human ABCA7 supports apolipoprotein-mediated release of cell... 		ACCEPT
Summary: This location fits ABCA7 function as a multipass membrane lipid transporter active at plasma, Golgi/endosomal, ruffle, and phagocytic-cup membranes.
Reason: The term aligns with direct biochemical evidence or well-supported cellular consequences of ABCA7 lipid transport and membrane-trafficking activity.
GO:0033344 cholesterol efflux
IDA
PMID:14570867
Human ABCA7 supports apolipoprotein-mediated release of cell... 		KEEP AS NON CORE
Summary: ABCA7 can support apoA-I-associated cholesterol/HDL-like outputs in overexpression systems, but phospholipid/lysoPC transport is the better-supported core activity.
Reason: Retain the annotation as non-core because it is plausible or experimentally observed, but not the primary evolved molecular role of ABCA7.
GO:0033700 phospholipid efflux
IDA
PMID:14570867
Human ABCA7 supports apolipoprotein-mediated release of cell... 		ACCEPT
Summary: This annotation is part of the core lipid transport, phospholipid efflux, or membrane-trafficking function of ABCA7.
Reason: The term aligns with direct biochemical evidence or well-supported cellular consequences of ABCA7 lipid transport and membrane-trafficking activity.
GO:0034188 apolipoprotein A-I receptor activity
IDA
PMID:14570867
Human ABCA7 supports apolipoprotein-mediated release of cell... 		ACCEPT
Summary: This molecular-function annotation captures the core ABCA7 activity: ATP-coupled intramembrane phospholipid transport/floppase activity and apoA-I-associated phospholipid efflux.
Reason: The term aligns with direct biochemical evidence or well-supported cellular consequences of ABCA7 lipid transport and membrane-trafficking activity.
GO:0034380 high-density lipoprotein particle assembly
IDA
PMID:14570867
Human ABCA7 supports apolipoprotein-mediated release of cell... 		KEEP AS NON CORE
Summary: ABCA7 can support apoA-I-associated cholesterol/HDL-like outputs in overexpression systems, but phospholipid/lysoPC transport is the better-supported core activity.
Reason: Retain the annotation as non-core because it is plausible or experimentally observed, but not the primary evolved molecular role of ABCA7.
GO:0038027 apolipoprotein A-I-mediated signaling pathway
IDA
PMID:14570867
Human ABCA7 supports apolipoprotein-mediated release of cell... 		MODIFY
Summary: The supporting experiment describes apoA-I binding and lipid efflux/HDL-like particle generation, not a signaling pathway as the primary function.
Reason: Replace with apoA-I receptor activity and phospholipid efflux/HDL assembly terms that match the experimental readout.
GO:0005886 plasma membrane
TAS
Reactome:R-HSA-382553 		ACCEPT
Summary: This location fits ABCA7 function as a multipass membrane lipid transporter active at plasma, Golgi/endosomal, ruffle, and phagocytic-cup membranes.
Reason: The term aligns with direct biochemical evidence or well-supported cellular consequences of ABCA7 lipid transport and membrane-trafficking activity.

Core Functions

ABCA7 uses ATP hydrolysis to move phospholipids across membrane leaflets, with direct evidence for phosphatidylserine and phosphatidylcholine/lysophosphatidylcholine transport. Through this membrane lipid-transport and trafficking activity, ABCA7 also supports phagocytic membrane organization, apoptotic-cell engulfment, and amyloid-beta clearance/processing in macrophage and microglial contexts.

Molecular Function:
ATPase-coupled intramembrane lipid transporter activity
Directly Involved In:
phospholipid translocation phospholipid efflux lipid transport transmembrane transport positive regulation of phagocytosis positive regulation of engulfment of apoptotic cell amyloid-beta clearance by cellular catabolic process positive regulation of amyloid-beta clearance negative regulation of amyloid-beta formation negative regulation of endocytosis regulation of amyloid precursor protein catabolic process
Cellular Locations:
plasma membrane Golgi membrane early endosome membrane ruffle membrane phagocytic cup
Supporting Evidence:
  • file:human/ABCA7/ABCA7-deep-research-falcon.md
    ABCA7 knockout reduced phosphatidylglycerol and cardiolipin; phosphatidylglycerol or NMN partially rescued phenotypes.
  • PMID:24097981
    ABCA7 preferentially exported phosphatidylserine
  • PMID:24097981
    The same phospholipids stimulated the ATPase activity of these ABCA transporters
  • PMID:28373057
    ABCA7 exported choline phospholipids in the presence of apoA-I and apoE
  • PMID:26260791
    ABCA7 has been shown to mediate phagocytosis and affect membrane trafficking
  • PMID:26260791
    more rapid endocytosis of APP in ABCA7 knock-out cells that is mechanistically consistent with the increased Aβ production
  • PMID:26260791
    uptake and clearance of aggregated Aβ plaques and aggregates

ABCA7 binds apolipoprotein A-I and supports apolipoprotein-mediated phospholipid efflux; cholesterol efflux and HDL assembly occur in some expression systems but are less consistent than phospholipid export.

Molecular Function:
apolipoprotein A-I receptor activity
Directly Involved In:
phospholipid efflux positive regulation of phospholipid efflux high-density lipoprotein particle assembly
Cellular Locations:
plasma membrane cell surface
Supporting Evidence:
  • PMID:12917409
    ABCA7 has the ability to bind apolipoproteins and promote efflux of cellular phospholipids without cholesterol
  • PMID:14570867
    Time-dependent release of cholesterol and phospholipid by apolipoprotein A (apoA)-I was parallel both with ABCA1 and with ABCA7

References

GO_REF:0000002
Gene Ontology annotation through association of InterPro records with GO terms
PMID:38135757
ABCA7 deficiency causes neuronal dysregulation by altering mitochondrial lipid metabolism.
file:human/ABCA7/ABCA7-deep-research-falcon.md
Falcon deep research report for ABCA7
  • Falcon deep research corroborates ABCA7 as an ATP-driven phospholipid floppase/transporter (cryo-EM open/closed states) and surfaces a mitochondrial phospholipid (phosphatidylglycerol/cardiolipin) phenotype on ABCA7 loss.
    "ABCA7 knockout reduced phosphatidylglycerol and cardiolipin; phosphatidylglycerol or NMN partially rescued phenotypes."
GO_REF:0000003
Gene Ontology annotation based on Enzyme Commission mapping
GO_REF:0000024
Manual transfer of experimentally-verified manual GO annotation data to orthologs by curator judgment of sequence similarity
GO_REF:0000033
Annotation inferences using phylogenetic trees
GO_REF:0000044
Gene Ontology annotation based on UniProtKB/Swiss-Prot Subcellular Location vocabulary mapping, accompanied by conservative changes to GO terms applied by UniProt
GO_REF:0000052
Gene Ontology annotation based on curation of immunofluorescence data
GO_REF:0000116
Automatic Gene Ontology annotation based on Rhea mapping
GO_REF:0000117
Electronic Gene Ontology annotations created by ARBA machine learning models
GO_REF:0000120
Combined Automated Annotation using Multiple IEA Methods
PMID:12917409
ATP-binding cassette transporter A7 (ABCA7) binds apolipoprotein A-I and mediates cellular phospholipid but not cholesterol efflux.
PMID:14570867
Human ABCA7 supports apolipoprotein-mediated release of cellular cholesterol and phospholipid to generate high density lipoprotein.
PMID:14592415
Posttranscriptional regulation of human ABCA7 and its function for the apoA-I-dependent lipid release.
PMID:24097981
Differential phospholipid substrates and directional transport by ATP-binding cassette proteins ABCA1, ABCA7, and ABCA4 and disease-causing mutants.
PMID:26260791
ATP-binding cassette transporter A7 (ABCA7) loss of function alters Alzheimer amyloid processing.
PMID:28373057
Lysophosphatidylcholine export by human ABCA7.
PMID:36115835
Quantitative fragmentomics allow affinity mapping of interactomes.
Reactome:R-HSA-1369062
ABC transporters in lipid homeostasis
Reactome:R-HSA-382553
ABCA7:Apo1A-mediated phospholipid efflux

Suggested Questions for Experts

Q: Which ABCA7 Alzheimer-risk variants impair phospholipid transport directly, and which primarily disrupt localization, apoA-I interaction, phagocytic-cup recruitment, or APP endocytic regulation?

Suggested experts: ABC transporter experts, Alzheimer genetics experts

Q: Should cholesterol efflux and HDL assembly remain curated for ABCA7 as context-specific outputs, or should they be deemphasized in favor of phospholipid/lysophospholipid efflux?

Suggested experts: lipid transport curators, GO lipid biology curators

Q: How should GO distinguish ABCA7-dependent amyloid-beta clearance from ABCA7-dependent regulation of APP endocytosis and amyloid-beta production?

Suggested experts: microglia biology experts, APP processing experts

Q: Is ABCA7's effect on mitochondria-related phospholipids (phosphatidylglycerol and cardiolipin) a direct consequence of its lipid-transport activity or an indirect downstream effect, and does it warrant a distinct process annotation? ABCA7 knockout iPSC-derived neurons/organoids show reduced phosphatidylglycerol and cardiolipin, mitochondrial dysfunction, and impaired respiration, rescued by phosphatidylglycerol or NMN [PMID:38135757].

Suggested experts: mitochondrial lipid biology experts, Alzheimer genetics experts

Suggested Experiments

Experiment: Measure phosphatidylserine, phosphatidylcholine, lysoPC, cholesterol, and apoA-I-dependent efflux in endogenous ABCA7 wild-type, knockout, and Alzheimer-risk variant human microglia and macrophages.

Hypothesis: ABCA7 risk variants primarily impair phospholipid/lysophospholipid transport rather than canonical cholesterol efflux.

Type: endogenous variant lipid efflux and floppase assay

Experiment: Track ABCA7, LRP1, APP, and amyloid-beta cargo localization during apoptotic-cell engulfment and amyloid uptake using live imaging and compartment-resolved proteomics.

Hypothesis: ABCA7 regulates amyloid outcomes through phagocytic/endocytic membrane organization and APP endocytosis rather than by directly binding amyloid-beta as a receptor.

Type: live-cell phagocytosis and APP trafficking assay

Experiment: Compare canonical isoform 1 and ER-localized isoform 2 for apoA-I-dependent efflux, ATPase-coupled phospholipid transport, and phagocytic-cup recruitment.

Hypothesis: Isoform-specific localization explains differences between cell-surface lipid efflux activity and ER-retained inactive or lower-activity ABCA7 pools.

Type: isoform-resolved localization and lipid transport assay

Experiment: Perform compartment-resolved lipidomics (mitochondrial vs plasma-membrane fractions) in ABCA7-knockout and isogenic-control human neurons to determine whether the loss of mitochondrial phosphatidylglycerol/cardiolipin reflects altered transport of a specific lipid species versus a secondary metabolic adaptation, and test rescue by targeted phosphatidylglycerol supplementation.

Hypothesis: ABCA7 loss reduces mitochondrial phosphatidylglycerol and cardiolipin and thereby impairs oxidative phosphorylation, contributing to neuronal dysfunction in Alzheimer risk.

Type: subcellular lipidomics and mitochondrial respirometry

Deep Research

Falcon

(ABCA7-deep-research-falcon.md)
Comprehensive Research Report: ABCA7 Gene Function and Annotation Falcon Edison Scientific Literature 10 citations 1 artifacts 2026-06-21T06:53:17.627567
Edison artifact artifact-00 (text/markdown)

The research report should be a detailed narrative explaining the function, biological processes, and localization of the gene product. Citations should be given for all claims.

You should prioritize authoritative reviews and primary scientific literature when conducting research. You can supplement
this with annotations you find in gene/protein databases, but these can be outdated or inaccurate.

We are specifically interested in the primary function of the gene - for enzymes, what reaction is catalyzed, and what is the substrate specificity? For transporters, what is the substrate? For structural proteins or adapters, what is the broader structural role? For signaling molecules, what is the role in the pathway.

We are interested in where in or outside the cell the gene product carries out its function.

We are also interested in the signaling or biochemical pathways in which the gene functions. We are less interested in broad pleiotropic effects, except where these elucidate the precise role.

Include evidence where possible. We are interested in both experimental evidence as well as inference from structure, evolution, or bioinformatic analysis. Precise studies should be prioritized over high-throughput, where available.

Comprehensive Research Report: ABCA7 Gene Function and Annotation

Gene Identity Confirmation

The gene ABCA7 (UniProt: Q8IZY2) encodes the ATP-binding cassette subfamily A member 7, also known as phospholipid-transporting ATPase ABCA7 (EC 7.6.2.1), in Homo sapiens (human) (le2023cryo‐emstructuresof pages 1-3, duchateau2024theabcsof pages 1-2). This full-length ABC transporter belongs to the ABCA family and contains characteristic domains including two transmembrane domains (TMDs), two nucleotide-binding domains (NBDs), large extracellular domains (ECDs), and regulatory domains (RDs) (le2023cryo‐emstructuresof pages 1-3, dib2021roleofabca7 pages 2-4). Recent high-resolution cryo-EM structures at 3.6-4.0 Å resolution have confirmed this architecture and provided detailed molecular insights into its function (le2023cryo‐emstructuresof pages 1-3, le2023cryo‐emstructuresof pages 3-4).

Aspect Summary of ABCA7 functional annotation Evidence / examples Key citations
Verified identity ABCA7 in this report refers to human ATP-binding cassette subfamily A member 7 / phospholipid-transporting ATPase ABCA7 (UniProt Q8IZY2), a full-length ABCA-family ABC transporter with two TMDs, two NBDs, large extracellular domains, and regulatory domains. Recent structural work explicitly analyzed human ABCA7 isoform 1 and described it as an ABCA-family phospholipid exporter/translocator linked to Alzheimer’s disease. (le2023cryo‐emstructuresof pages 1-3, duchateau2024theabcsof pages 1-2, dib2021roleofabca7 pages 1-2)
Primary molecular function / enzyme activity ABCA7 is an ATP-dependent lipid transporter whose best-supported primary biochemical role is phospholipid translocation/extrusion across the plasma membrane, with more limited cholesterol export than ABCA1. It is not a soluble enzyme acting on a small-molecule substrate; rather, ATP hydrolysis powers membrane lipid movement. Cryo-EM and ATPase studies show ATP-dependent conformational cycling; older functional studies and reviews indicate ABCA7 exports phospholipids and can generate HDL-like particles with apolipoprotein acceptors, but is less efficient than ABCA1 for cholesterol efflux. (le2023cryo‐emstructuresof pages 1-3, le2023cryo‐emstructuresof pages 3-4, le2023cryo‐emstructuresof pages 6-8, dib2021roleofabca7 pages 2-4, abedohmae2021abca7linkssterol pages 1-3)
ATPase / catalytic mechanism ATP hydrolysis occurs at the two cytoplasmic NBDs and drives transitions between open and nucleotide-bound closed conformations. In nanodiscs/liposomes, ABCA7 ATPase activity follows Michaelis-Menten kinetics; catalytic glutamate mutations strongly reduce activity. Le et al. showed ATPase activity in detergent, liposomes, and nanodiscs, with reduced activity in the hydrolysis-deficient E965Q/E1951Q mutant and structural capture of open and ATP-bound closed states. (le2023cryo‐emstructuresof pages 1-3, le2023cryo‐emstructuresof pages 3-4, le2023cryo‐emstructuresof pages 4-6)
Supported lipid substrates The strongest evidence supports phospholipids as primary substrates, especially phosphatidylcholine (PC), phosphatidylserine (PS), sphingomyelin, and lysophosphatidylcholine; ABCA7 can also transport/export cholesterol, but generally less robustly than ABCA1. Reviews summarizing cell-based efflux work report ABCA7 preferentially transfers phospholipids to HDL-like particles and acceptors, while cholesterol efflux is modest; structural work could not assign exact phospholipid identity in the TMD but showed lipids occupying the transport pathway. (dib2021roleofabca7 pages 2-4, abedohmae2021abca7linkssterol pages 1-3, le2023cryo‐emstructuresof pages 3-4)
Lipid specificity details Lipid composition modulates ABCA7 activity: ATPase activity is highest in PE and PS nanodiscs, lower in PC; cholesterol in nanodiscs inhibited ATPase under tested conditions. ABCA7 has been linked to PS flipping and PC extrusion, consistent with effects on membrane asymmetry. Structural/biochemical work found highest ATPase stimulation in PE and PS nanodiscs; discussion linked prior reports of higher PS translocation to the outer leaflet and higher PC extrusion. (le2023cryo‐emstructuresof pages 3-4, le2023cryo‐emstructuresof pages 6-8)
Transport direction / mechanism of lipid movement Current model supports a dual but related role in (i) phospholipid flipping from the cytoplasmic to extracellular leaflet and (ii) lipid extrusion from the extracellular leaflet toward the ECD and apolipoprotein acceptors. The 2023 cryo-EM study proposed a “bellows-like” mechanism in which TMD opening draws in bilayer lipids and closure expels them upward/back out; reviews note that exact substrate identity and the relationship between flipping and extrusion remain unresolved. (le2023cryo‐emstructuresof pages 8-9, le2023cryo‐emstructuresof pages 6-8, duchateau2024theabcsof pages 1-2)
Structural mechanism In the open state, an ordered patch/file of bilayer lipids traverses the TMD; in the ATP-bound closed state, the TMD becomes lipid-free except for a small extracellular exit pocket. Positively charged residues near the ECD/TMD interface likely help guide phospholipid headgroups. Cryo-EM resolved lipid density inside the TMD in open nanodisc-reconstituted ABCA7 and a closed ATP-bound state with a putative lipid exit pocket; mutating ECD basic residues lowered ATPase activity. (le2023cryo‐emstructuresof pages 3-4, le2023cryo‐emstructuresof pages 4-6, le2023cryo‐emstructuresof pages 6-8)
Subcellular localization ABCA7 localizes primarily to the plasma membrane, where it performs lipid translocation/efflux; it is also detected intracellularly, including the endoplasmic reticulum (ER). An alternative splice isoform is reported mainly in the ER. Full-length ABCA7 has cell-surface and intracellular localization; type II splice isoform is ER-restricted. Missense variants can exclude ABCA7 from the plasma membrane and retain it in the ER. (dib2021roleofabca7 pages 2-4, bossaerts2022raremissensemutations pages 1-2)
Localization defects in disease variants Pathogenic missense variants can impair ABCA7 function by mislocalization, reducing the amount of transporter at the plasma membrane rather than necessarily abolishing expression. In HeLa-cell assays, several AD-associated missense variants showed decreased plasma membrane localization and increased ER retention. (bossaerts2022raremissensemutations pages 1-2)
Tissue and cell-type expression ABCA7 is highly expressed in myelo-lymphatic tissues and immune cells, including macrophages, B cells, and NK cells; in the brain it is expressed in neurons, microglia, astrocytes, endothelial cells/BBB, and pericytes. Reviews summarize expression in peripheral leukocytes, thymus, spleen, bone marrow, fetal tissues, and multiple human/mouse brain cell types. Human iPSC-based work notes abundant neuronal expression. (dib2021roleofabca7 pages 1-2, dib2021roleofabca7 pages 2-4, kawatani2024abca7deficiencycauses pages 1-2)
Lipid metabolism pathway role ABCA7 participates in cellular lipid homeostasis, especially phospholipid handling and limited cholesterol efflux to apolipoprotein acceptors such as apoA-I and apoE, contributing to HDL-like particle formation and membrane lipid organization. ABCA7 shares strong homology with ABCA1, binds apoA-I/apoE in cellular studies, and transfers phospholipids efficiently; endogenous ABCA7 is thought to function more in host defense/phagocytosis than in classic HDL biogenesis. (dib2021roleofabca7 pages 2-4, abedohmae2021abca7linkssterol pages 1-3, duchateau2024theabcsof pages 1-2)
Phagocytosis / innate immunity role ABCA7 supports phagocytosis of apoptotic cells and likely contributes to microglial/macrophage engulfment by shaping membrane lipid asymmetry and/or receptor-containing membrane domains. Reviews summarize reduced phagocytic activity in ABCA7-deficient macrophages and relocalization with LRP1 at the plasma membrane in the presence of apoptotic cells. (dib2021roleofabca7 pages 2-4, abedohmae2021abca7linkssterol pages 1-3, stepler2022abca7agenetic pages 1-3)
Membrane organization role ABCA7 likely regulates plasma membrane asymmetry, lipid raft/nanodomain composition, and local bilayer structure, which can influence receptor signaling and phagocytic competence. Structural and review evidence links ABCA7-mediated lipid translocation with altered outer leaflet PS/PC distribution and immune membrane organization. (le2023cryo‐emstructuresof pages 6-8, stepler2022abca7agenetic pages 1-3)
Mitochondrial lipid metabolism role ABCA7 deficiency alters mitochondria-related phospholipids, particularly phosphatidylglycerol and cardiolipin, causing abnormal mitochondrial morphology, reduced ATP synthase activity/respiration, higher ROS, and downstream neuronal/synaptic dysfunction. In human iPSC-derived cortical organoids and neurons, ABCA7 knockout reduced phosphatidylglycerol and cardiolipin; phosphatidylglycerol or NMN partially rescued phenotypes. (kawatani2024abca7deficiencycauses pages 1-2)
Amyloid / APP metabolism role ABCA7 is implicated in Alzheimer-relevant APP processing, amyloid deposition, and possibly Aβ clearance, though the dominant mechanism remains unsettled and may vary by context (lipid transport, microglial phagocytosis, or both). Genetic association, CSF biomarker, and review literature support altered APP processing and amyloid-related biomarker changes in mutation carriers; multiple studies associate ABCA7 dysfunction with increased amyloid pathology. (duchateau2024theabcsof pages 1-2, stepler2022abca7agenetic pages 1-3, duchateau2024theabcsof pages 5-7)
Regulation by sterol-sensing pathways ABCA7 expression is regulated differently from ABCA1: a key model proposes negative regulation by the SREBP system, so reduced cellular cholesterol can increase ABCA7-linked host-defense functions. Regulation may be cell-type specific. Abe-Dohmae and Yokoyama reviewed SREBP-dependent negative regulation; later work in human neural cell lines found cholesterol depletion reduced ABCA7 in microglia/astrocytes, highlighting context dependence. (abedohmae2021abca7linkssterol pages 1-3, duchateau2024theabcsof pages 1-2)
Alternative splicing / isoforms At least two isoforms are discussed in the literature. The shorter type II ABCA7 has a different N-terminus, shows tissue-dependent expression, and is mainly ER-localized, suggesting non-identical functions versus canonical ABCA7. Full-length ABCA7 is enriched in brain and bone marrow, whereas type II is more abundant in lymph node, spleen, thymus, and trachea. (dib2021roleofabca7 pages 2-4)
Major disease association ABCA7 is a major genetic risk gene for late-onset Alzheimer’s disease (LOAD) and is among the stronger common/rare variant contributors identified after APOE in some populations. Multiple reviews summarize GWAS and sequencing evidence connecting common SNPs, PTC variants, missense variants, and VNTR expansion with AD risk. (duchateau2024theabcsof pages 1-2, stepler2022abca7agenetic pages 1-3, duchateau2024theabcsof pages 5-7)
Disease-associated variant classes Pathogenic classes include premature termination codon (PTC) variants (nonsense, frameshift, canonical splice), VNTR expansion, and damaging missense variants. Proposed mechanisms include haploinsufficiency, altered splicing, and plasma membrane exclusion/mislocalization. Reviews and cohort studies note NMD/haploinsufficiency for many PTC alleles; missense mutations can cause ER retention and plasma membrane exclusion. (bossaerts2022raremissensemutations pages 1-2, duchateau2024theabcsof pages 5-7)
Disease statistics / effect sizes In reviewed cohorts, AD-enriched ABCA7 PTC variants show odds ratios roughly 1.4–5.3 depending on ancestry/study design; in Caucasian cohorts ORs around 1.7–2.6 were summarized, while some African American variants have especially high frequency/effect. Duchateau et al. summarized frequencies and ORs across cohorts and highlighted the strong impact of African ancestry variants such as the 44-bp deletion background. (duchateau2024theabcsof pages 5-7, stepler2022abca7agenetic pages 1-3)
Ancestry-related findings ABCA7-associated AD risk is particularly important in African American / African ancestry populations, where some variants may confer effect sizes comparable to or stronger than APOE ε4 in specific studies. Reviews emphasize higher burden/frequency of certain ABCA7 risk variants in African American cohorts and stronger association signals than typically seen in European cohorts. (stepler2022abca7agenetic pages 1-3, duchateau2024theabcsof pages 5-7)
Functional interpretation Overall, the most evidence-supported annotation is that ABCA7 is a plasma-membrane, ATP-driven phospholipid translocator/exporter whose lipid-remodeling activity connects membrane homeostasis, phagocytosis/innate immunity, neuronal mitochondrial lipid balance, and AD-related amyloid biology. This integrates structural, biochemical, expression, genetic, and iPSC-neuronal evidence. Important unresolved questions remain about precise endogenous substrates and the relative contribution of lipid export versus phagocytic signaling in disease. (le2023cryo‐emstructuresof pages 1-3, kawatani2024abca7deficiencycauses pages 1-2, duchateau2024theabcsof pages 1-2, le2023cryo‐emstructuresof pages 6-8)

Table: This table summarizes the current functional annotation of human ABCA7, including its biochemical activity, substrates, localization, pathways, expression, regulation, and disease relevance. It is useful as a compact evidence-based reference connecting structural, cellular, and genetic findings.

Primary Molecular Function and Catalytic Mechanism

Enzyme Activity and Substrate Specificity

ABCA7 functions as an ATP-dependent phospholipid transporter, with its primary biochemical role being phospholipid translocation and extrusion across the plasma membrane (le2023cryo‐emstructuresof pages 1-3, le2023cryo‐emstructuresof pages 3-4). Unlike a soluble enzyme acting on small-molecule substrates, ABCA7 uses ATP hydrolysis to power conformational changes that drive membrane lipid movement.

The transporter exhibits substrate specificity for phospholipids, with strongest evidence supporting phosphatidylcholine (PC), phosphatidylserine (PS), sphingomyelin, and lysophosphatidylcholine as primary substrates (dib2021roleofabca7 pages 2-4, abedohmae2021abca7linkssterol pages 1-3). ABCA7 can also transport cholesterol, though less efficiently than its close homolog ABCA1 (54% sequence identity), which is the major HDL biogenesis transporter (dib2021roleofabca7 pages 2-4, abedohmae2021abca7linkssterol pages 1-3). Functional studies demonstrate that ABCA7 preferentially transfers phospholipids to HDL-like particles and apolipoprotein acceptors (apoA-I and apoE), with modest cholesterol efflux capacity (dib2021roleofabca7 pages 2-4, abedohmae2021abca7linkssterol pages 1-3).

ATPase Activity and Lipid Modulation

Recent biochemical characterization revealed that ABCA7 ATPase activity follows Michaelis-Menten kinetics with KM values in the 0.5-0.8 mM range for ATP when reconstituted in detergent, liposomes, or nanodiscs (le2023cryo‐emstructuresof pages 1-3, le2023cryo‐emstructuresof pages 3-4). Importantly, the lipid environment significantly modulates catalytic activity: ATPase rates are highest in phosphatidylethanolamine (PE) and phosphatidylserine (PS) nanodiscs, followed by brain polar lipids (BPL) lacking cholesterol, and lowest in phosphatidylcholine (PC) nanodiscs (le2023cryo‐emstructuresof pages 3-4). Cholesterol in the lipid environment appears to have an inhibitory effect on ATPase activity under the tested conditions (le2023cryo‐emstructuresof pages 3-4).

A hydrolysis-deficient mutant harboring E965Q and E1951Q substitutions at the catalytic sites showed drastically reduced activity, confirming that the observed ATPase activity is specific and required for function (le2023cryo‐emstructuresof pages 3-4).

Structural Mechanism of Phospholipid Transport

The 2023 cryo-EM structures of human ABCA7 revealed unprecedented molecular details of the phospholipid translocation mechanism (le2023cryo‐emstructuresof pages 1-3, le2023cryo‐emstructuresof pages 3-4, le2023cryo‐emstructuresof pages 4-6). In the open conformation (captured in lipid nanodiscs), an ordered patch of bilayer lipids from both membrane leaflets traverses the entire width of the TMD (le2023cryo‐emstructuresof pages 3-4). The resolution and quality of the EM density allowed visualization of individual acyl chains forming a continuous file through the TMD lumen.

In the ATP-bound closed state (using the E965Q/E1951Q mutant), the TMD becomes largely lipid-free with a small extracellular "exit pocket" that could accommodate approximately two acyl chains (le2023cryo‐emstructuresof pages 4-6). This exit pocket is formed by a 4-TM bundle comprising TMs 2, 5, 8, and 11 and is lined with hydrophobic residues except for positively charged residues including R475, K478, R482, R548, and K1407 (le2023cryo‐emstructuresof pages 3-4, le2023cryo‐emstructuresof pages 6-8).

Molecular dynamics (MD) simulations complemented the structural data by revealing that phospholipids can penetrate the TMD cavity from both the cytoplasmic and extracellular leaflets, forming an elevated configuration within the TMD lumen (le2023cryo‐emstructuresof pages 6-8). The simulations captured a tendency for lipids to accumulate near the identified positively charged residues, with R482 and R548 displaying the most frequent lipid contacts (le2023cryo‐emstructuresof pages 6-8). These data support a "bellows-like" mechanism where TMD opening draws in bilayer lipids and closure expels them back out into the bilayer or upward toward the extracellular domain (le2023cryo‐emstructuresof pages 8-9, le2023cryo‐emstructuresof pages 6-8).

Transport Direction and Dual Function

Current evidence supports a dual role for ABCA7 in: (1) phospholipid flipping from the cytoplasmic to extracellular leaflet (flippase activity), and (2) lipid extrusion from the extracellular leaflet toward apolipoprotein acceptors in the extracellular space (le2023cryo‐emstructuresof pages 8-9, le2023cryo‐emstructuresof pages 6-8). Previous functional studies reported higher levels of PC extrusion and higher levels of PS translocation to the outer leaflet, consistent with ABCA7's influence on membrane asymmetry (le2023cryo‐emstructuresof pages 3-4, le2023cryo‐emstructuresof pages 6-8). The positively charged ECD residues likely help direct negatively charged phospholipid headgroups during the extrusion process; mutations of R475, K478, and R482 (ABCA7-AAA mutant) resulted in significantly lower ATPase activity (le2023cryo‐emstructuresof pages 3-4).

Subcellular Localization

Primary Localization and Cell-Surface Expression

ABCA7 localizes primarily to the plasma membrane, where it performs its lipid translocation and efflux functions (bossaerts2022raremissensemutations pages 1-2, dib2021roleofabca7 pages 2-4). Full-length ABCA7 exhibits both cell-surface and intracellular localization patterns. Immunocytochemistry studies in transfected cells demonstrate clear plasma membrane expression of wildtype ABCA7 (bossaerts2022raremissensemutations pages 1-2).

Alternative Isoform Localization

At least two ABCA7 isoforms arise from alternative splicing (dib2021roleofabca7 pages 2-4). The shorter "type II ABCA7" has 28 amino acids in the N-terminal tail instead of 166 amino acids present in full-length ABCA7. These isoforms show tissue-dependent expression patterns and differential cellular localization. While full-length ABCA7 is detected on the cell surface and intracellularly, type II ABCA7 is exclusively detected in the endoplasmic reticulum (dib2021roleofabca7 pages 2-4). Full-length ABCA7 is strongly expressed in brain and bone marrow, whereas type II is abundant in lymph node, spleen, thymus, and trachea, suggesting distinct biological functions (dib2021roleofabca7 pages 2-4).

Pathogenic Mislocalization

Disease-associated missense mutations can impair ABCA7 function through protein mislocalization rather than loss of expression (bossaerts2022raremissensemutations pages 1-2). Analysis of 10 predicted deleterious missense mutations identified in Belgian AD cohorts revealed that several induced protein mislocalization in HeLa cell assays, resulting in decreased plasma membrane localization and increased retention in the endoplasmic reticulum (bossaerts2022raremissensemutations pages 1-2). This plasma membrane exclusion phenotype represents a pathogenic mechanism whereby functional ABCA7 protein is absent from its site of action. One missense mutation (p.G1820S) showed autosomal dominant co-segregation with AD in a pedigree (bossaerts2022raremissensemutations pages 1-2).

Tissue and Cellular Expression Patterns

ABCA7 exhibits distinct expression patterns across tissues and cell types. It is highly expressed in myelo-lymphatic tissues and immune cells, including macrophages, follicular B cells, NK cells, and peritoneal macrophages (dib2021roleofabca7 pages 2-4, dib2021roleofabca7 pages 1-2). Expression is higher in differentiated macrophages compared to monocytes, suggesting a role in immune cell function (dib2021roleofabca7 pages 2-4).

In the brain, ABCA7 mRNA and protein are expressed in multiple cell types including neurons, microglia, astrocytes, endothelial cells of the blood-brain barrier (BBB), brain pericytes, and ventricular ependymal cells (dib2021roleofabca7 pages 2-4, dib2021roleofabca7 pages 1-2). This widespread brain expression pattern is conserved between humans and rodents. Human iPSC-derived models confirm abundant neuronal expression of ABCA7 (kawatani2024abca7deficiencycauses pages 1-2).

Biological Pathways and Cellular Processes

Lipid Metabolism and Homeostasis

ABCA7 participates in cellular lipid homeostasis by mediating phospholipid and limited cholesterol efflux to apolipoprotein acceptors (dib2021roleofabca7 pages 2-4, abedohmae2021abca7linkssterol pages 1-3). When transiently overexpressed in cells, ABCA7 can generate HDL-like particles with apoA-I and apoE, though these particles are smaller and contain less cholesterol than those generated by ABCA1 (abedohmae2021abca7linkssterol pages 1-3). However, endogenous ABCA7 appears to function more prominently in host defense and phagocytosis than in classical reverse cholesterol transport and HDL biogenesis (dib2021roleofabca7 pages 2-4, abedohmae2021abca7linkssterol pages 1-3).

Regulation by Sterol-Sensing Pathways

ABCA7 expression is regulated differently from ABCA1. A key model proposes negative regulation by the SREBP (sterol regulatory element-binding protein) system, such that decreased cellular cholesterol can enhance ABCA7 function and expression, thereby linking sterol metabolism to host defense functions (abedohmae2021abca7linkssterol pages 1-3). However, recent work in human neural cell lines found that cholesterol depletion actually downregulated ABCA7 in C20 and HMC3 microglia and A172 astrocytes but had no effect in SK-N-SH neurons, highlighting cell-type-specific regulatory mechanisms (duchateau2024theabcsof pages 1-2). ABCA7 was also downregulated by pro-inflammatory cytokines IL-1β and TNFα in microglia (duchateau2024theabcsof pages 1-2).

Phagocytosis and Innate Immunity

ABCA7 plays an important role in phagocytosis of apoptotic cells by macrophages and microglia (stepler2022abca7agenetic pages 1-3, dib2021roleofabca7 pages 2-4, abedohmae2021abca7linkssterol pages 1-3). Its C. elegans ortholog CED-7 is known to participate in apoptotic cell clearance (abedohmae2021abca7linkssterol pages 1-3). In mammalian systems, ABCA7-deficient macrophages and immune cells from ABCA7 knockout mice show diminished phagocytic capacity (abedohmae2021abca7linkssterol pages 1-3). In macrophages, ABCA7 and LRP1 relocalize together to the plasma membrane in the presence of apoptotic cells (dib2021roleofabca7 pages 2-4).

The mechanism likely involves ABCA7-mediated alterations in membrane lipid asymmetry and lipid raft composition. Enrichment of phosphatidylserine (PS) at the extracellular surface is linked to phagocytosis and phagocytosis-associated proteins within the membrane (le2023cryo‐emstructuresof pages 6-8). By modulating the distribution of PS and other phospholipids between membrane leaflets, ABCA7 may influence the presentation of "eat-me" signals and phagocytic receptor function (stepler2022abca7agenetic pages 1-3, le2023cryo‐emstructuresof pages 6-8).

Mitochondrial Lipid Metabolism

Recent evidence from ABCA7-deficient human iPSC models has revealed a critical role in mitochondrial lipid metabolism (kawatani2024abca7deficiencycauses pages 1-2). Lipidomics analysis of ABCA7 knockout iPSC-derived cortical organoids showed reduced levels of mitochondria-related phospholipids, particularly phosphatidylglycerol and cardiolipin (kawatani2024abca7deficiencycauses pages 1-2). These lipid changes were accompanied by:

  • Altered mitochondrial morphology (enlarged mitochondria)
  • Reduced ATP synthase activity
  • Compromised mitochondrial respiration
  • Excess ROS generation
  • Exacerbated oxidative damage
  • Decreased spontaneous synaptic firing and network formation in iPSC-derived neurons

Importantly, supplementation with phosphatidylglycerol or the NAD+ precursor nicotinamide mononucleotide (NMN) rescued these phenotypes, demonstrating that the mitochondrial dysfunction is directly linked to altered lipid metabolism (kawatani2024abca7deficiencycauses pages 1-2). These effects were recapitulated in synaptosomes from neuron-specific Abca7 knockout mice, confirming the relevance of this pathway in vivo (kawatani2024abca7deficiencycauses pages 1-2).

Amyloid Metabolism and APP Processing

ABCA7 is implicated in APP (amyloid precursor protein) processing and amyloid-β (Aβ) metabolism, though the precise mechanisms remain under investigation (duchateau2024theabcsof pages 1-2, stepler2022abca7agenetic pages 1-3). Loss of ABCA7 function has been associated with:

  • Increased Aβ production and deposition
  • Altered APP processing
  • Potentially impaired Aβ clearance by microglia

CSF biomarker studies of ABCA7 mutation carriers revealed altered levels of amyloid-related biomarkers, including reduced Aβ1-42 in VNTR expansion carriers, along with changes in sAPPα and sAPPβ, suggesting effects on APP processing pathways (duchateau2024theabcsof pages 1-2). The connection may involve multiple mechanisms: direct effects on membrane lipid composition affecting APP processing enzymes, indirect effects through impaired microglial phagocytic clearance of Aβ, or both (duchateau2024theabcsof pages 1-2, stepler2022abca7agenetic pages 1-3).

Disease Associations and Clinical Relevance

Alzheimer's Disease Risk

ABCA7 is a major genetic risk factor for late-onset Alzheimer's disease (LOAD), initially identified through genome-wide association studies (GWAS) in 2011 (duchateau2024theabcsof pages 1-2, dib2021roleofabca7 pages 2-4, dib2021roleofabca7 pages 1-2). Multiple classes of genetic variants contribute to disease risk:

  1. Common GWAS SNPs: Multiple common variants show association with AD, with some also linked to amyloid pathology endophenotypes (duchateau2024theabcsof pages 1-2, duchateau2024theabcsof pages 5-7).

  2. Premature Termination Codon (PTC) variants: Including nonsense, frameshift, and canonical splice site mutations. These show enrichment in AD patients with odds ratios ranging from 1.4 to 5.3 depending on ancestry and study design (duchateau2024theabcsof pages 5-7). In Caucasian cohorts, ORs around 1.7-2.6 have been reported, with frequencies in AD patients ranging from 0.39% to 4.4% (duchateau2024theabcsof pages 5-7). A notable variant is the noncanonical splice region mutation c.5570+5G>C, which causes aberrant splicing and is relatively common in non-Finnish Europeans (0.31% frequency) (duchateau2024theabcsof pages 5-7).

  3. VNTR (variable number of tandem repeats) expansions: Expanded ABCA7 VNTR alleles (>5720 bp) in intron 18 are enriched in AD patients and correlate with reduced ABCA7 expression and increased exon 19 skipping (duchateau2024theabcsof pages 5-7).

  4. Missense variants: Predicted damaging missense variants increase AD risk with ORs varying between 1.4 and 1.8 in Caucasian cohorts (duchateau2024theabcsof pages 5-7). About 5.58% of early-onset AD (EOAD) patients in Caucasian populations carry damaging missense variants (duchateau2024theabcsof pages 5-7).

Ancestry-Specific Effects

ABCA7-associated AD risk is particularly pronounced in African American and African ancestry populations (stepler2022abca7agenetic pages 1-3, duchateau2024theabcsof pages 5-7). In some studies, ABCA7 has shown a stronger effect size than APOE ε4 in African American adults (stepler2022abca7agenetic pages 1-3). The 44-bp deletion (rs142076058, p.R578fs) is common in African Americans (found in up to 21.7% of AD patients) though it has a weaker risk-increasing effect than some other variants (duchateau2024theabcsof pages 5-7). Analysis of gnomAD data shows that PTC variant frequencies are highest in African/African American populations (6.64%) compared to non-Finnish Europeans (0.74%) and other ancestries (duchateau2024theabcsof pages 5-7).

Clinical and Neuropathological Features

ABCA7 PTC mutation carriers show relatively high familial clustering of AD (77.3% familial history versus 50% in general AD cohorts) and an average age at onset of 67 years, though with substantial variability (duchateau2024theabcsof pages 5-7). Carriers generally present with a classical amnestic AD phenotype and typical AD neuropathology, often with a strong vascular component and frequent cerebral amyloid angiopathy (duchateau2024theabcsof pages 5-7). Some studies suggest more aggressive clinical features with higher rates of depression and earlier age at onset (duchateau2024theabcsof pages 5-7).

Proposed Mechanisms of Action

The current model proposes that ABCA7 loss-of-function contributes to AD risk through multiple interconnected mechanisms (duchateau2024theabcsof pages 1-2, duchateau2024theabcsof pages 5-7):

  1. Haploinsufficiency through nonsense-mediated mRNA decay of PTC alleles
  2. Plasma membrane exclusion due to mislocalization of certain missense variants
  3. Impaired lipid homeostasis affecting membrane composition and signaling
  4. Reduced microglial phagocytosis of Aβ and apoptotic debris
  5. Altered APP processing and increased amyloid deposition
  6. Mitochondrial dysfunction due to abnormal phospholipid metabolism
  7. Reduced inflammatory response (suggested by decreased YKL-40 in CSF of expansion carriers)

Summary and Future Directions

ABCA7 is a multifunctional ATP-dependent phospholipid transporter primarily localized to the plasma membrane, where it mediates lipid translocation between membrane leaflets and extrusion to extracellular acceptors. Its primary biochemical role involves transporting phospholipids (PC, PS, sphingomyelin) with limited cholesterol transport capacity. Recent high-resolution structural studies have elucidated a bellows-like mechanism whereby ATP-driven conformational changes power lipid movement through the transmembrane domain.

ABCA7's biological functions span multiple interconnected pathways including lipid homeostasis, phagocytosis and innate immunity, mitochondrial lipid metabolism, and amyloid-β regulation. These diverse roles reflect ABCA7's expression in immune cells (macrophages, microglia) and various brain cell types (neurons, astrocytes, endothelial cells).

As a major genetic risk factor for Alzheimer's disease, particularly in African American populations, ABCA7 dysfunction illustrates how disrupted lipid metabolism can contribute to neurodegenerative disease through impaired membrane homeostasis, compromised phagocytic clearance, mitochondrial dysfunction, and altered APP processing. The relative contribution of each mechanism to AD pathogenesis remains an active area of investigation, as does the identification of precise endogenous substrates and the development of therapeutic strategies targeting ABCA7 function.

Future research directions should focus on: (1) defining the exact phospholipid substrates and transport directionality under physiological conditions, (2) understanding cell-type-specific functions and regulation, (3) elucidating how different disease-associated variants affect specific ABCA7 functions, (4) identifying genetic or environmental modifiers that influence disease penetrance in mutation carriers, and (5) exploring therapeutic interventions that enhance ABCA7 activity or compensate for its loss.

References

  1. (le2023cryo‐emstructuresof pages 1-3): Le Thi My Le, James Robert Thompson, Sepehr Dehghani‐Ghahnaviyeh, Shashank Pant, Phuoc Xuan Dang, Jarrod Bradley French, Takahisa Kanikeyo, Emad Tajkhorshid, and Amer Alam. Cryo‐em structures of human abca7 provide insights into its phospholipid translocation mechanisms. The EMBO Journal, Dec 2023. URL: https://doi.org/10.15252/embj.2022111065, doi:10.15252/embj.2022111065. This article has 24 citations.

  2. (duchateau2024theabcsof pages 1-2): Lena Duchateau, Nicole Wawrzyniak, and Kristel Sleegers. The abc's of alzheimer risk gene abca7. Alzheimer's & Dementia, 20:3629-3648, Mar 2024. URL: https://doi.org/10.1002/alz.13805, doi:10.1002/alz.13805. This article has 33 citations and is from a highest quality peer-reviewed journal.

  3. (dib2021roleofabca7 pages 2-4): Shiraz Dib, Jens Pahnke, and Fabien Gosselet. Role of abca7 in human health and in alzheimer’s disease. International Journal of Molecular Sciences, 22:4603, Apr 2021. URL: https://doi.org/10.3390/ijms22094603, doi:10.3390/ijms22094603. This article has 101 citations.

  4. (le2023cryo‐emstructuresof pages 3-4): Le Thi My Le, James Robert Thompson, Sepehr Dehghani‐Ghahnaviyeh, Shashank Pant, Phuoc Xuan Dang, Jarrod Bradley French, Takahisa Kanikeyo, Emad Tajkhorshid, and Amer Alam. Cryo‐em structures of human abca7 provide insights into its phospholipid translocation mechanisms. The EMBO Journal, Dec 2023. URL: https://doi.org/10.15252/embj.2022111065, doi:10.15252/embj.2022111065. This article has 24 citations.

  5. (dib2021roleofabca7 pages 1-2): Shiraz Dib, Jens Pahnke, and Fabien Gosselet. Role of abca7 in human health and in alzheimer’s disease. International Journal of Molecular Sciences, 22:4603, Apr 2021. URL: https://doi.org/10.3390/ijms22094603, doi:10.3390/ijms22094603. This article has 101 citations.

  6. (le2023cryo‐emstructuresof pages 6-8): Le Thi My Le, James Robert Thompson, Sepehr Dehghani‐Ghahnaviyeh, Shashank Pant, Phuoc Xuan Dang, Jarrod Bradley French, Takahisa Kanikeyo, Emad Tajkhorshid, and Amer Alam. Cryo‐em structures of human abca7 provide insights into its phospholipid translocation mechanisms. The EMBO Journal, Dec 2023. URL: https://doi.org/10.15252/embj.2022111065, doi:10.15252/embj.2022111065. This article has 24 citations.

  7. (abedohmae2021abca7linkssterol pages 1-3): Sumiko Abe-Dohmae and Shinji Yokoyama. Abca7 links sterol metabolism to the host defense system: molecular background for potential management measure of alzheimer's disease. Feb 2021. URL: https://doi.org/10.1016/j.gene.2020.145316, doi:10.1016/j.gene.2020.145316. This article has 18 citations and is from a peer-reviewed journal.

  8. (le2023cryo‐emstructuresof pages 4-6): Le Thi My Le, James Robert Thompson, Sepehr Dehghani‐Ghahnaviyeh, Shashank Pant, Phuoc Xuan Dang, Jarrod Bradley French, Takahisa Kanikeyo, Emad Tajkhorshid, and Amer Alam. Cryo‐em structures of human abca7 provide insights into its phospholipid translocation mechanisms. The EMBO Journal, Dec 2023. URL: https://doi.org/10.15252/embj.2022111065, doi:10.15252/embj.2022111065. This article has 24 citations.

  9. (le2023cryo‐emstructuresof pages 8-9): Le Thi My Le, James Robert Thompson, Sepehr Dehghani‐Ghahnaviyeh, Shashank Pant, Phuoc Xuan Dang, Jarrod Bradley French, Takahisa Kanikeyo, Emad Tajkhorshid, and Amer Alam. Cryo‐em structures of human abca7 provide insights into its phospholipid translocation mechanisms. The EMBO Journal, Dec 2023. URL: https://doi.org/10.15252/embj.2022111065, doi:10.15252/embj.2022111065. This article has 24 citations.

  10. (bossaerts2022raremissensemutations pages 1-2): Liene Bossaerts, Elisabeth Hendrickx Van de Craen, Rita Cacace, Bob Asselbergh, and Christine Van Broeckhoven. Rare missense mutations in abca7 might increase alzheimer’s disease risk by plasma membrane exclusion. Acta Neuropathologica Communications, Mar 2022. URL: https://doi.org/10.1186/s40478-022-01346-3, doi:10.1186/s40478-022-01346-3. This article has 30 citations and is from a peer-reviewed journal.

  11. (kawatani2024abca7deficiencycauses pages 1-2): Keiji Kawatani, Marie-Louise Holm, Skylar C. Starling, Yuka A. Martens, Jing Zhao, Wenyan Lu, Yingxue Ren, Zonghua Li, Peizhou Jiang, Yangying Jiang, Samantha K. Baker, Ni Wang, Bhaskar Roy, Tammee M. Parsons, Ralph B. Perkerson, Hanmei Bao, Xianlin Han, Guojun Bu, and Takahisa Kanekiyo. Abca7 deficiency causes neuronal dysregulation by altering mitochondrial lipid metabolism. Molecular Psychiatry, 29:809-819, Dec 2024. URL: https://doi.org/10.1038/s41380-023-02372-w, doi:10.1038/s41380-023-02372-w. This article has 57 citations and is from a highest quality peer-reviewed journal.

  12. (stepler2022abca7agenetic pages 1-3): Kaitlyn E. Stepler, Taneisha R. Gillyard, Calla B. Reed, Tyra M. Avery, Jamaine S. Davis, and Renã A.S. Robinson. Abca7, a genetic risk factor associated with alzheimer’s disease risk in african americans. Mar 2022. URL: https://doi.org/10.3233/jad-215306, doi:10.3233/jad-215306. This article has 32 citations and is from a peer-reviewed journal.

  13. (duchateau2024theabcsof pages 5-7): Lena Duchateau, Nicole Wawrzyniak, and Kristel Sleegers. The abc's of alzheimer risk gene abca7. Alzheimer's & Dementia, 20:3629-3648, Mar 2024. URL: https://doi.org/10.1002/alz.13805, doi:10.1002/alz.13805. This article has 33 citations and is from a highest quality peer-reviewed journal.

Artifacts

Citations

  1. bossaerts2022raremissensemutations pages 1-2
  2. duchateau2024theabcsof pages 1-2
  3. duchateau2024theabcsof pages 5-7
  4. https://doi.org/10.15252/embj.2022111065,
  5. https://doi.org/10.1002/alz.13805,
  6. https://doi.org/10.3390/ijms22094603,
  7. https://doi.org/10.1016/j.gene.2020.145316,
  8. https://doi.org/10.1186/s40478-022-01346-3,
  9. https://doi.org/10.1038/s41380-023-02372-w,
  10. https://doi.org/10.3233/jad-215306,

📚 Additional Documentation

Notes

(ABCA7-notes.md)

ABCA7 notes

Review status

  • First-pass review completed on 2026-06-19.
  • just fetch-gene-pmids human ABCA7 completed successfully; all 7 PMID-backed publication caches were present after refresh.
  • Falcon deep research was attempted with timeout 180 just deep-research-falcon human ABCA7 --fallback perplexity-lite, but the process timed out and no provider deep-research artifact was written. These notes rely on cached UniProt, GOA, and publication files.
  • just validate human ABCA7 passes cleanly.

Functional synthesis

ABCA7 is an ATP-binding cassette subfamily A lipid transporter. The most direct biochemical evidence supports ATP-coupled phospholipid translocation/floppase activity, especially phosphatidylserine export: PMID:24097981 The same study connects lipid movement to ATPase activity: PMID:24097981 and to apolipoprotein loading: PMID:24097981

ABCA7 also binds apolipoproteins and supports apoA-I-dependent phospholipid efflux. One early study found PMID:12917409, while another found apoA-I-dependent cholesterol and phospholipid release in overexpression systems PMID:14570867. Later substrate work supports choline-phospholipid and lysoPC export in brain-relevant cells: PMID:28373057 and PMID:28373057

For Alzheimer-relevant biology, ABCA7 should be framed as a lipid transporter that affects membrane trafficking, phagocytosis, and amyloid processing rather than as a direct amyloid receptor. A full-text cached study states PMID:26260791 and reports that loss of ABCA7 increases amyloidogenic processing: PMID:26260791 Mechanistically, the same paper links this to endocytosis: PMID:26260791 and discusses amyloid uptake/clearance as a plausible parallel mechanism: PMID:26260791.

Annotation decisions

  • Accepted ATP binding, ATP hydrolysis, ABC transporter activity, ATPase-coupled intramembrane lipid transporter activity, floppase activity, phosphatidylserine/phosphatidylcholine floppase activity, phospholipid transfer/efflux/translocation, apoA-I receptor activity, and core membrane locations.
  • Accepted positive regulation of phagocytosis, apoptotic-cell engulfment, amyloid-beta clearance, negative regulation of amyloid-beta formation, APP catabolic-process regulation, and negative regulation of endocytosis as ABCA7-linked membrane-trafficking outputs.
  • Kept cholesterol efflux, positive regulation of cholesterol efflux, and HDL particle assembly as non-core because human overexpression evidence exists but phospholipid/lysoPC export is more consistently supported as the core substrate activity.
  • Modified undirected amyloid-beta formation annotations to directional regulation terms, and modified apolipoprotein A-I-mediated signaling pathway to apoA-I receptor/lipid-efflux terms.
  • Marked generic protein binding and inferred protein localization to nucleus as over-annotated.

Final action distribution: 55 ACCEPT, 20 KEEP_AS_NON_CORE, 4 MODIFY, 2 MARK_AS_OVER_ANNOTATED.

Knowledge gaps and experiments

  • The major mechanistic gap is whether Alzheimer-associated ABCA7 variants impair ATP-coupled phospholipid transport directly, disrupt apoA-I interaction, or mainly alter phagocytic/endocytic membrane organization.
  • Cholesterol efflux should be treated cautiously until endogenous-cell evidence separates ABCA7 from ABCA1-like overexpression behavior.
  • Useful experiments would combine endogenous ABCA7 variant knock-ins in human microglia/macrophages with phospholipid/lysoPC transport assays, apoA-I efflux assays, phagocytic-cup recruitment, LRP1/APP endocytosis imaging, and amyloid-beta uptake/clearance assays.

2026-06-20 second-pass audit

The second-pass audit added manual reference_review metadata for ABCA7 phospholipid efflux, apolipoprotein binding, reconstituted phospholipid transport, lysophosphatidylcholine export, and loss-of-function effects on APP/amyloid processing. No annotation action changes were needed: ABCA7 remains curated primarily as an ATP-driven phospholipid transporter with phagocytic/endocytic and amyloid-processing consequences, while cholesterol efflux is retained cautiously as non-core where the supporting evidence comes from overexpression or broader ABCA-family behavior.

Falcon deep research integration (2026-06-21)

The Falcon (Edison) report (ABCA7-deep-research-falcon.md) broadly corroborates the existing review's core framing of ABCA7 as a plasma-membrane, ATP-driven phospholipid translocator/exporter coupled to phagocytosis, membrane trafficking, and amyloid biology, and adds structural and mitochondrial detail not in the current notes. (All Falcon-sourced citations below are not yet independently verified against full text.)

New or refined findings beyond the existing notes/review:

  • Structural mechanism: 2023 cryo-EM structures of human ABCA7 (3.6-4.0 A) capture open and ATP-bound closed states and support a "bellows-like" lipid-translocation mechanism; the ATP-bound closed state was captured with the hydrolysis-deficient E965Q/E1951Q double mutant, with a small extracellular lipid exit pocket lined by basic residues (R475/K478/R482/R548/K1407) [Le et al., EMBO J 2023, doi:10.15252/embj.2022111065] (not yet independently verified against full text).
  • Lipid-environment modulation of ATPase: activity highest in PE and PS nanodiscs, lower in PC, and inhibited by cholesterol; ECD basic-residue mutants (ABCA7-AAA) reduce ATPase activity [Le et al., EMBO J 2023, doi:10.15252/embj.2022111065] (not yet independently verified). This refines (does not contradict) the existing PS/PC floppase framing.
  • Mitochondrial lipid metabolism (genuinely new pathway): ABCA7 knockout in human iPSC cortical organoids/neurons lowers phosphatidylglycerol and cardiolipin, causing abnormal mitochondrial morphology, reduced ATP synthase activity/respiration, raised ROS, and synaptic dysfunction; rescued by phosphatidylglycerol or NMN, and recapitulated in neuron-specific Abca7 KO mouse synaptosomes [Kawatani et al., Mol Psychiatry 2024, doi:10.1038/s41380-023-02372-w] (not yet independently verified). Not represented in current annotations.
  • Disease-variant mechanism / localization: AD-associated missense variants cause plasma-membrane exclusion with ER retention rather than loss of expression; p.G1820S co-segregated with AD in a pedigree [Bossaerts et al., Acta Neuropathol Commun 2022, doi:10.1186/s40478-022-01346-3] (not yet independently verified). This supports keeping ER (GO:0005783) localization as a real, disease-relevant compartment, not merely non-core noise.
  • Regulation: SREBP-dependent negative regulation links ABCA7 to host defense; cholesterol depletion downregulates ABCA7 in microglia/astrocytes but not neurons, and IL-1beta/TNFalpha downregulate it in microglia (cell-type-specific) [Abe-Dohmae & Yokoyama, Gene 2021, doi:10.1016/j.gene.2020.145316; Duchateau et al., Alzheimer's Dement 2024, doi:10.1002/alz.13805] (not yet independently verified).
  • Interaction partner: LRP1 co-relocalizes with ABCA7 to the plasma membrane in the presence of apoptotic cells, consistent with the curated phagocytic-cup/engulfment role [Dib et al., Int J Mol Sci 2021, doi:10.3390/ijms22094603] (not yet independently verified).
  • Disease genetics refinement: ancestry-specific effect sizes (PTC OR ~1.4-5.3; stronger burden in African/African American cohorts, e.g. 44-bp deletion rs142076058 p.R578fs), VNTR expansion, and the c.5570+5G>C splice variant [Duchateau et al., Alzheimer's Dement 2024, doi:10.1002/alz.13805; Stepler et al., J Alzheimers Dis 2022, doi:10.3233/jad-215306] (not yet independently verified).

Discrepancies / annotations to revisit:

  • No direct contradiction with the existing review or its actions. The Falcon report agrees that cholesterol efflux is weaker than ABCA1 and secondary to phospholipid export, supporting the existing KEEP_AS_NON_CORE on the cholesterol-efflux terms.
  • Potential gap (consider, do not auto-apply): the mitochondrial phospholipid (phosphatidylglycerol/cardiolipin) phenotype from Kawatani 2024 is not captured by any current GO term in the review; this is a downstream organismal/cellular consequence and may warrant a non-core process annotation or a suggested_question rather than a core function. No specific well-fitting GO term was confirmed via OLS here, so flagging only.
  • The existing review already handles amyloid biology with directional terms (GO:1902430, GO:1902991, GO:1900223, GO:0150094); Falcon's APP/amyloid material reinforces these and the GO:0034205 MODIFY decisions, so no change recommended.

📄 View Raw YAML

 
id: Q8IZY2
gene_symbol: ABCA7
product_type: PROTEIN
status: COMPLETE
taxon:
  id: NCBITaxon:9606
  label: Homo sapiens
description: >-
  ABCA7 encodes an ATP-binding cassette subfamily A lipid transporter that couples
  ATP hydrolysis to intramembrane phospholipid movement, with strong substrate support
  for phosphatidylserine, phosphatidylcholine, and lysophosphatidylcholine. The canonical
  protein localizes to plasma membrane, Golgi/endosomal membranes, ruffle membranes,
  and phagocytic cups in myeloid and other cells. ABCA7 binds apolipoprotein A-I and
  supports apolipoprotein-mediated phospholipid efflux, while cholesterol efflux and
  HDL assembly are more context-dependent. In macrophages and microglia, ABCA7 contributes
  to membrane trafficking, phagocytosis, apoptotic-cell engulfment, and amyloid-beta
  clearance/processing pathways relevant to Alzheimer disease risk.
alternative_products:
- name: 1 (Type 1)
  id: Q8IZY2-1
- name: 2 (Type 2)
  id: Q8IZY2-2
  sequence_note: VSP_020701, VSP_020702
existing_annotations:
- term:
    id: GO:0042626
    label: ATPase-coupled transmembrane transporter activity
  evidence_type: IBA
  original_reference_id: GO_REF:0000033
  qualifier: enables
  review:
    summary: >-
      This molecular-function annotation captures the core ABCA7 activity: ATP-coupled
      intramembrane phospholipid transport/floppase activity and apoA-I-associated
      phospholipid efflux.
    action: ACCEPT
    reason: >-
      The term aligns with direct biochemical evidence or well-supported cellular
      consequences of ABCA7 lipid transport and membrane-trafficking activity.
- term:
    id: GO:0033344
    label: cholesterol efflux
  evidence_type: IBA
  original_reference_id: GO_REF:0000033
  qualifier: involved_in
  review:
    summary: >-
      ABCA7 can support apoA-I-associated cholesterol/HDL-like outputs in overexpression
      systems, but phospholipid/lysoPC transport is the better-supported core activity.
    action: KEEP_AS_NON_CORE
    reason: >-
      Retain the annotation as non-core because it is plausible or experimentally
      observed, but not the primary evolved molecular role of ABCA7.
- term:
    id: GO:0033700
    label: phospholipid efflux
  evidence_type: IBA
  original_reference_id: GO_REF:0000033
  qualifier: involved_in
  review:
    summary: >-
      This annotation is part of the core lipid transport, phospholipid efflux, or
      membrane-trafficking function of ABCA7.
    action: ACCEPT
    reason: >-
      The term aligns with direct biochemical evidence or well-supported cellular
      consequences of ABCA7 lipid transport and membrane-trafficking activity.
- term:
    id: GO:0034188
    label: apolipoprotein A-I receptor activity
  evidence_type: IBA
  original_reference_id: GO_REF:0000033
  qualifier: enables
  review:
    summary: >-
      This molecular-function annotation captures the core ABCA7 activity: ATP-coupled
      intramembrane phospholipid transport/floppase activity and apoA-I-associated
      phospholipid efflux.
    action: ACCEPT
    reason: >-
      The term aligns with direct biochemical evidence or well-supported cellular
      consequences of ABCA7 lipid transport and membrane-trafficking activity.
- term:
    id: GO:0090554
    label: phosphatidylcholine floppase activity
  evidence_type: IBA
  original_reference_id: GO_REF:0000033
  qualifier: enables
  review:
    summary: >-
      This molecular-function annotation captures the core ABCA7 activity: ATP-coupled
      intramembrane phospholipid transport/floppase activity and apoA-I-associated
      phospholipid efflux.
    action: ACCEPT
    reason: >-
      The term aligns with direct biochemical evidence or well-supported cellular
      consequences of ABCA7 lipid transport and membrane-trafficking activity.
- term:
    id: GO:0090556
    label: phosphatidylserine floppase activity
  evidence_type: IBA
  original_reference_id: GO_REF:0000033
  qualifier: enables
  review:
    summary: >-
      This molecular-function annotation captures the core ABCA7 activity: ATP-coupled
      intramembrane phospholipid transport/floppase activity and apoA-I-associated
      phospholipid efflux.
    action: ACCEPT
    reason: >-
      The term aligns with direct biochemical evidence or well-supported cellular
      consequences of ABCA7 lipid transport and membrane-trafficking activity.
- term:
    id: GO:0000139
    label: Golgi membrane
  evidence_type: IEA
  original_reference_id: GO_REF:0000044
  qualifier: located_in
  review:
    summary: >-
      This location fits ABCA7 function as a multipass membrane lipid transporter
      active at plasma, Golgi/endosomal, ruffle, and phagocytic-cup membranes.
    action: ACCEPT
    reason: >-
      The term aligns with direct biochemical evidence or well-supported cellular
      consequences of ABCA7 lipid transport and membrane-trafficking activity.
- term:
    id: GO:0001891
    label: phagocytic cup
  evidence_type: IEA
  original_reference_id: GO_REF:0000044
  qualifier: located_in
  review:
    summary: >-
      This location fits ABCA7 function as a multipass membrane lipid transporter
      active at plasma, Golgi/endosomal, ruffle, and phagocytic-cup membranes.
    action: ACCEPT
    reason: >-
      The term aligns with direct biochemical evidence or well-supported cellular
      consequences of ABCA7 lipid transport and membrane-trafficking activity.
- term:
    id: GO:0005524
    label: ATP binding
  evidence_type: IEA
  original_reference_id: GO_REF:0000002
  qualifier: enables
  review:
    summary: >-
      This molecular-function annotation captures the core ABCA7 activity: ATP-coupled
      intramembrane phospholipid transport/floppase activity and apoA-I-associated
      phospholipid efflux.
    action: ACCEPT
    reason: >-
      The term aligns with direct biochemical evidence or well-supported cellular
      consequences of ABCA7 lipid transport and membrane-trafficking activity.
- term:
    id: GO:0005737
    label: cytoplasm
  evidence_type: IEA
  original_reference_id: GO_REF:0000120
  qualifier: located_in
  review:
    summary: >-
      This annotation may reflect a valid cell-state, localization, or signaling consequence,
      but it is peripheral to ABCA7 core lipid transporter/phagocytic function.
    action: KEEP_AS_NON_CORE
    reason: >-
      Retain the annotation as non-core because it is plausible or experimentally
      observed, but not the primary evolved molecular role of ABCA7.
- term:
    id: GO:0005783
    label: endoplasmic reticulum
  evidence_type: IEA
  original_reference_id: GO_REF:0000044
  qualifier: located_in
  review:
    summary: >-
      This annotation may reflect a valid cell-state, localization, or signaling consequence,
      but it is peripheral to ABCA7 core lipid transporter/phagocytic function.
    action: KEEP_AS_NON_CORE
    reason: >-
      Retain the annotation as non-core because it is plausible or experimentally
      observed, but not the primary evolved molecular role of ABCA7.
- term:
    id: GO:0005886
    label: plasma membrane
  evidence_type: IEA
  original_reference_id: GO_REF:0000120
  qualifier: located_in
  review:
    summary: >-
      This location fits ABCA7 function as a multipass membrane lipid transporter
      active at plasma, Golgi/endosomal, ruffle, and phagocytic-cup membranes.
    action: ACCEPT
    reason: >-
      The term aligns with direct biochemical evidence or well-supported cellular
      consequences of ABCA7 lipid transport and membrane-trafficking activity.
- term:
    id: GO:0016020
    label: membrane
  evidence_type: IEA
  original_reference_id: GO_REF:0000002
  qualifier: located_in
  review:
    summary: >-
      This location fits ABCA7 function as a multipass membrane lipid transporter
      active at plasma, Golgi/endosomal, ruffle, and phagocytic-cup membranes.
    action: ACCEPT
    reason: >-
      The term aligns with direct biochemical evidence or well-supported cellular
      consequences of ABCA7 lipid transport and membrane-trafficking activity.
- term:
    id: GO:0016887
    label: ATP hydrolysis activity
  evidence_type: IEA
  original_reference_id: GO_REF:0000002
  qualifier: enables
  review:
    summary: >-
      This molecular-function annotation captures the core ABCA7 activity: ATP-coupled
      intramembrane phospholipid transport/floppase activity and apoA-I-associated
      phospholipid efflux.
    action: ACCEPT
    reason: >-
      The term aligns with direct biochemical evidence or well-supported cellular
      consequences of ABCA7 lipid transport and membrane-trafficking activity.
- term:
    id: GO:0031901
    label: early endosome membrane
  evidence_type: IEA
  original_reference_id: GO_REF:0000044
  qualifier: located_in
  review:
    summary: >-
      This location fits ABCA7 function as a multipass membrane lipid transporter
      active at plasma, Golgi/endosomal, ruffle, and phagocytic-cup membranes.
    action: ACCEPT
    reason: >-
      The term aligns with direct biochemical evidence or well-supported cellular
      consequences of ABCA7 lipid transport and membrane-trafficking activity.
- term:
    id: GO:0032587
    label: ruffle membrane
  evidence_type: IEA
  original_reference_id: GO_REF:0000044
  qualifier: located_in
  review:
    summary: >-
      This location fits ABCA7 function as a multipass membrane lipid transporter
      active at plasma, Golgi/endosomal, ruffle, and phagocytic-cup membranes.
    action: ACCEPT
    reason: >-
      The term aligns with direct biochemical evidence or well-supported cellular
      consequences of ABCA7 lipid transport and membrane-trafficking activity.
- term:
    id: GO:0033344
    label: cholesterol efflux
  evidence_type: IEA
  original_reference_id: GO_REF:0000117
  qualifier: involved_in
  review:
    summary: >-
      ABCA7 can support apoA-I-associated cholesterol/HDL-like outputs in overexpression
      systems, but phospholipid/lysoPC transport is the better-supported core activity.
    action: KEEP_AS_NON_CORE
    reason: >-
      Retain the annotation as non-core because it is plausible or experimentally
      observed, but not the primary evolved molecular role of ABCA7.
- term:
    id: GO:0033700
    label: phospholipid efflux
  evidence_type: IEA
  original_reference_id: GO_REF:0000117
  qualifier: involved_in
  review:
    summary: >-
      This annotation is part of the core lipid transport, phospholipid efflux, or
      membrane-trafficking function of ABCA7.
    action: ACCEPT
    reason: >-
      The term aligns with direct biochemical evidence or well-supported cellular
      consequences of ABCA7 lipid transport and membrane-trafficking activity.
- term:
    id: GO:0034188
    label: apolipoprotein A-I receptor activity
  evidence_type: IEA
  original_reference_id: GO_REF:0000117
  qualifier: enables
  review:
    summary: >-
      This molecular-function annotation captures the core ABCA7 activity: ATP-coupled
      intramembrane phospholipid transport/floppase activity and apoA-I-associated
      phospholipid efflux.
    action: ACCEPT
    reason: >-
      The term aligns with direct biochemical evidence or well-supported cellular
      consequences of ABCA7 lipid transport and membrane-trafficking activity.
- term:
    id: GO:0034205
    label: amyloid-beta formation
  evidence_type: IEA
  original_reference_id: GO_REF:0000117
  qualifier: involved_in
  review:
    summary: >-
      ABCA7 loss increases APP endocytosis and amyloid-beta production, so the evidence
      supports regulation, especially negative regulation by functional ABCA7, rather
      than simple involvement in amyloid-beta formation.
    action: MODIFY
    proposed_replacement_terms: &id001
    - id: GO:1902430
      label: negative regulation of amyloid-beta formation
    - id: GO:1902991
      label: regulation of amyloid precursor protein catabolic process
    reason: >-
      Use directional regulation terms to avoid implying ABCA7 is a positive component
      of amyloid-beta formation.
- term:
    id: GO:0055085
    label: transmembrane transport
  evidence_type: IEA
  original_reference_id: GO_REF:0000002
  qualifier: involved_in
  review:
    summary: >-
      This annotation is part of the core lipid transport, phospholipid efflux, or
      membrane-trafficking function of ABCA7.
    action: ACCEPT
    reason: >-
      The term aligns with direct biochemical evidence or well-supported cellular
      consequences of ABCA7 lipid transport and membrane-trafficking activity.
- term:
    id: GO:0090554
    label: phosphatidylcholine floppase activity
  evidence_type: IEA
  original_reference_id: GO_REF:0000116
  qualifier: enables
  review:
    summary: >-
      This molecular-function annotation captures the core ABCA7 activity: ATP-coupled
      intramembrane phospholipid transport/floppase activity and apoA-I-associated
      phospholipid efflux.
    action: ACCEPT
    reason: >-
      The term aligns with direct biochemical evidence or well-supported cellular
      consequences of ABCA7 lipid transport and membrane-trafficking activity.
- term:
    id: GO:0090556
    label: phosphatidylserine floppase activity
  evidence_type: IEA
  original_reference_id: GO_REF:0000116
  qualifier: enables
  review:
    summary: >-
      This molecular-function annotation captures the core ABCA7 activity: ATP-coupled
      intramembrane phospholipid transport/floppase activity and apoA-I-associated
      phospholipid efflux.
    action: ACCEPT
    reason: >-
      The term aligns with direct biochemical evidence or well-supported cellular
      consequences of ABCA7 lipid transport and membrane-trafficking activity.
- term:
    id: GO:0140326
    label: ATPase-coupled intramembrane lipid carrier activity
  evidence_type: IEA
  original_reference_id: GO_REF:0000003
  qualifier: enables
  review:
    summary: >-
      This molecular-function annotation captures the core ABCA7 activity: ATP-coupled
      intramembrane phospholipid transport/floppase activity and apoA-I-associated
      phospholipid efflux.
    action: ACCEPT
    reason: >-
      The term aligns with direct biochemical evidence or well-supported cellular
      consequences of ABCA7 lipid transport and membrane-trafficking activity.
- term:
    id: GO:0140328
    label: floppase activity
  evidence_type: IEA
  original_reference_id: GO_REF:0000117
  qualifier: enables
  review:
    summary: >-
      This molecular-function annotation captures the core ABCA7 activity: ATP-coupled
      intramembrane phospholipid transport/floppase activity and apoA-I-associated
      phospholipid efflux.
    action: ACCEPT
    reason: >-
      The term aligns with direct biochemical evidence or well-supported cellular
      consequences of ABCA7 lipid transport and membrane-trafficking activity.
- term:
    id: GO:0140359
    label: ABC-type transporter activity
  evidence_type: IEA
  original_reference_id: GO_REF:0000002
  qualifier: enables
  review:
    summary: >-
      This molecular-function annotation captures the core ABCA7 activity: ATP-coupled
      intramembrane phospholipid transport/floppase activity and apoA-I-associated
      phospholipid efflux.
    action: ACCEPT
    reason: >-
      The term aligns with direct biochemical evidence or well-supported cellular
      consequences of ABCA7 lipid transport and membrane-trafficking activity.
- term:
    id: GO:1902991
    label: regulation of amyloid precursor protein catabolic process
  evidence_type: IEA
  original_reference_id: GO_REF:0000117
  qualifier: involved_in
  review:
    summary: >-
      ABCA7 loss-of-function data support a role in regulating APP endocytosis/processing
      and limiting amyloid-beta formation.
    action: ACCEPT
    reason: >-
      The term aligns with direct biochemical evidence or well-supported cellular
      consequences of ABCA7 lipid transport and membrane-trafficking activity.
- term:
    id: GO:0005515
    label: protein binding
  evidence_type: IPI
  original_reference_id: PMID:36115835
  qualifier: enables
  review:
    summary: >-
      The PDZ/motif interaction evidence is real but generic protein binding is not
      informative for ABCA7 core biology.
    action: MARK_AS_OVER_ANNOTATED
    reason: >-
      ABCA7 function is better captured by ATP-coupled lipid carrier/floppase activity,
      apoA-I receptor activity, and phagocytic/endocytic lipid-trafficking processes.
- term:
    id: GO:0006869
    label: lipid transport
  evidence_type: TAS
  original_reference_id: Reactome:R-HSA-1369062
  qualifier: involved_in
  review:
    summary: >-
      This annotation is part of the core lipid transport, phospholipid efflux, or
      membrane-trafficking function of ABCA7.
    action: ACCEPT
    reason: >-
      The term aligns with direct biochemical evidence or well-supported cellular
      consequences of ABCA7 lipid transport and membrane-trafficking activity.
- term:
    id: GO:0033344
    label: cholesterol efflux
  evidence_type: IGI
  original_reference_id: PMID:28373057
  qualifier: involved_in
  review:
    summary: >-
      ABCA7 can support apoA-I-associated cholesterol/HDL-like outputs in overexpression
      systems, but phospholipid/lysoPC transport is the better-supported core activity.
    action: KEEP_AS_NON_CORE
    reason: >-
      Retain the annotation as non-core because it is plausible or experimentally
      observed, but not the primary evolved molecular role of ABCA7.
- term:
    id: GO:0120014
    label: phospholipid transfer activity
  evidence_type: IGI
  original_reference_id: PMID:28373057
  qualifier: enables
  review:
    summary: >-
      This molecular-function annotation captures the core ABCA7 activity: ATP-coupled
      intramembrane phospholipid transport/floppase activity and apoA-I-associated
      phospholipid efflux.
    action: ACCEPT
    reason: >-
      The term aligns with direct biochemical evidence or well-supported cellular
      consequences of ABCA7 lipid transport and membrane-trafficking activity.
- term:
    id: GO:0140326
    label: ATPase-coupled intramembrane lipid carrier activity
  evidence_type: IDA
  original_reference_id: PMID:28373057
  qualifier: enables
  review:
    summary: >-
      This molecular-function annotation captures the core ABCA7 activity: ATP-coupled
      intramembrane phospholipid transport/floppase activity and apoA-I-associated
      phospholipid efflux.
    action: ACCEPT
    reason: >-
      The term aligns with direct biochemical evidence or well-supported cellular
      consequences of ABCA7 lipid transport and membrane-trafficking activity.
- term:
    id: GO:0120014
    label: phospholipid transfer activity
  evidence_type: TAS
  original_reference_id: Reactome:R-HSA-382553
  qualifier: enables
  review:
    summary: >-
      This molecular-function annotation captures the core ABCA7 activity: ATP-coupled
      intramembrane phospholipid transport/floppase activity and apoA-I-associated
      phospholipid efflux.
    action: ACCEPT
    reason: >-
      The term aligns with direct biochemical evidence or well-supported cellular
      consequences of ABCA7 lipid transport and membrane-trafficking activity.
- term:
    id: GO:0005794
    label: Golgi apparatus
  evidence_type: IDA
  original_reference_id: GO_REF:0000052
  qualifier: located_in
  review:
    summary: >-
      This location fits ABCA7 function as a multipass membrane lipid transporter
      active at plasma, Golgi/endosomal, ruffle, and phagocytic-cup membranes.
    action: ACCEPT
    reason: >-
      The term aligns with direct biochemical evidence or well-supported cellular
      consequences of ABCA7 lipid transport and membrane-trafficking activity.
- term:
    id: GO:0005886
    label: plasma membrane
  evidence_type: IDA
  original_reference_id: GO_REF:0000052
  qualifier: located_in
  review:
    summary: >-
      This location fits ABCA7 function as a multipass membrane lipid transporter
      active at plasma, Golgi/endosomal, ruffle, and phagocytic-cup membranes.
    action: ACCEPT
    reason: >-
      The term aligns with direct biochemical evidence or well-supported cellular
      consequences of ABCA7 lipid transport and membrane-trafficking activity.
- term:
    id: GO:0030054
    label: cell junction
  evidence_type: IDA
  original_reference_id: GO_REF:0000052
  qualifier: located_in
  review:
    summary: >-
      This annotation may reflect a valid cell-state, localization, or signaling consequence,
      but it is peripheral to ABCA7 core lipid transporter/phagocytic function.
    action: KEEP_AS_NON_CORE
    reason: >-
      Retain the annotation as non-core because it is plausible or experimentally
      observed, but not the primary evolved molecular role of ABCA7.
- term:
    id: GO:0000139
    label: Golgi membrane
  evidence_type: ISS
  original_reference_id: GO_REF:0000024
  qualifier: located_in
  review:
    summary: >-
      This location fits ABCA7 function as a multipass membrane lipid transporter
      active at plasma, Golgi/endosomal, ruffle, and phagocytic-cup membranes.
    action: ACCEPT
    reason: >-
      The term aligns with direct biochemical evidence or well-supported cellular
      consequences of ABCA7 lipid transport and membrane-trafficking activity.
- term:
    id: GO:0005737
    label: cytoplasm
  evidence_type: ISS
  original_reference_id: GO_REF:0000024
  qualifier: located_in
  review:
    summary: >-
      This annotation may reflect a valid cell-state, localization, or signaling consequence,
      but it is peripheral to ABCA7 core lipid transporter/phagocytic function.
    action: KEEP_AS_NON_CORE
    reason: >-
      Retain the annotation as non-core because it is plausible or experimentally
      observed, but not the primary evolved molecular role of ABCA7.
- term:
    id: GO:0005737
    label: cytoplasm
  evidence_type: EXP
  original_reference_id: PMID:14592415
  qualifier: located_in
  review:
    summary: >-
      This annotation may reflect a valid cell-state, localization, or signaling consequence,
      but it is peripheral to ABCA7 core lipid transporter/phagocytic function.
    action: KEEP_AS_NON_CORE
    reason: >-
      Retain the annotation as non-core because it is plausible or experimentally
      observed, but not the primary evolved molecular role of ABCA7.
- term:
    id: GO:0005783
    label: endoplasmic reticulum
  evidence_type: EXP
  original_reference_id: PMID:14592415
  qualifier: located_in
  review:
    summary: >-
      This annotation may reflect a valid cell-state, localization, or signaling consequence,
      but it is peripheral to ABCA7 core lipid transporter/phagocytic function.
    action: KEEP_AS_NON_CORE
    reason: >-
      Retain the annotation as non-core because it is plausible or experimentally
      observed, but not the primary evolved molecular role of ABCA7.
- term:
    id: GO:0005886
    label: plasma membrane
  evidence_type: EXP
  original_reference_id: PMID:12917409
  qualifier: located_in
  review:
    summary: >-
      This location fits ABCA7 function as a multipass membrane lipid transporter
      active at plasma, Golgi/endosomal, ruffle, and phagocytic-cup membranes.
    action: ACCEPT
    reason: >-
      The term aligns with direct biochemical evidence or well-supported cellular
      consequences of ABCA7 lipid transport and membrane-trafficking activity.
- term:
    id: GO:0005886
    label: plasma membrane
  evidence_type: EXP
  original_reference_id: PMID:14592415
  qualifier: located_in
  review:
    summary: >-
      This location fits ABCA7 function as a multipass membrane lipid transporter
      active at plasma, Golgi/endosomal, ruffle, and phagocytic-cup membranes.
    action: ACCEPT
    reason: >-
      The term aligns with direct biochemical evidence or well-supported cellular
      consequences of ABCA7 lipid transport and membrane-trafficking activity.
- term:
    id: GO:0031901
    label: early endosome membrane
  evidence_type: ISS
  original_reference_id: GO_REF:0000024
  qualifier: located_in
  review:
    summary: >-
      This location fits ABCA7 function as a multipass membrane lipid transporter
      active at plasma, Golgi/endosomal, ruffle, and phagocytic-cup membranes.
    action: ACCEPT
    reason: >-
      The term aligns with direct biochemical evidence or well-supported cellular
      consequences of ABCA7 lipid transport and membrane-trafficking activity.
- term:
    id: GO:0140326
    label: ATPase-coupled intramembrane lipid carrier activity
  evidence_type: EXP
  original_reference_id: PMID:24097981
  qualifier: enables
  review:
    summary: >-
      This molecular-function annotation captures the core ABCA7 activity: ATP-coupled
      intramembrane phospholipid transport/floppase activity and apoA-I-associated
      phospholipid efflux.
    action: ACCEPT
    reason: >-
      The term aligns with direct biochemical evidence or well-supported cellular
      consequences of ABCA7 lipid transport and membrane-trafficking activity.
- term:
    id: GO:0001891
    label: phagocytic cup
  evidence_type: ISS
  original_reference_id: GO_REF:0000024
  qualifier: located_in
  review:
    summary: >-
      This location fits ABCA7 function as a multipass membrane lipid transporter
      active at plasma, Golgi/endosomal, ruffle, and phagocytic-cup membranes.
    action: ACCEPT
    reason: >-
      The term aligns with direct biochemical evidence or well-supported cellular
      consequences of ABCA7 lipid transport and membrane-trafficking activity.
- term:
    id: GO:0032587
    label: ruffle membrane
  evidence_type: ISS
  original_reference_id: GO_REF:0000024
  qualifier: located_in
  review:
    summary: >-
      This location fits ABCA7 function as a multipass membrane lipid transporter
      active at plasma, Golgi/endosomal, ruffle, and phagocytic-cup membranes.
    action: ACCEPT
    reason: >-
      The term aligns with direct biochemical evidence or well-supported cellular
      consequences of ABCA7 lipid transport and membrane-trafficking activity.
- term:
    id: GO:0005886
    label: plasma membrane
  evidence_type: IDA
  original_reference_id: PMID:28373057
  qualifier: located_in
  review:
    summary: >-
      This location fits ABCA7 function as a multipass membrane lipid transporter
      active at plasma, Golgi/endosomal, ruffle, and phagocytic-cup membranes.
    action: ACCEPT
    reason: >-
      The term aligns with direct biochemical evidence or well-supported cellular
      consequences of ABCA7 lipid transport and membrane-trafficking activity.
- term:
    id: GO:0008542
    label: visual learning
  evidence_type: ISS
  original_reference_id: GO_REF:0000024
  qualifier: involved_in
  review:
    summary: >-
      Learning and memory phenotypes are downstream organismal consequences, not direct
      ABCA7 molecular functions.
    action: KEEP_AS_NON_CORE
    reason: >-
      Retain the annotation as non-core because it is plausible or experimentally
      observed, but not the primary evolved molecular role of ABCA7.
- term:
    id: GO:0019216
    label: regulation of lipid metabolic process
  evidence_type: ISS
  original_reference_id: GO_REF:0000024
  qualifier: involved_in
  review:
    summary: >-
      This annotation is part of the core lipid transport, phospholipid efflux, or
      membrane-trafficking function of ABCA7.
    action: ACCEPT
    reason: >-
      The term aligns with direct biochemical evidence or well-supported cellular
      consequences of ABCA7 lipid transport and membrane-trafficking activity.
- term:
    id: GO:0033700
    label: phospholipid efflux
  evidence_type: IGI
  original_reference_id: PMID:28373057
  qualifier: involved_in
  review:
    summary: >-
      This annotation is part of the core lipid transport, phospholipid efflux, or
      membrane-trafficking function of ABCA7.
    action: ACCEPT
    reason: >-
      The term aligns with direct biochemical evidence or well-supported cellular
      consequences of ABCA7 lipid transport and membrane-trafficking activity.
- term:
    id: GO:0043409
    label: negative regulation of MAPK cascade
  evidence_type: ISS
  original_reference_id: GO_REF:0000024
  qualifier: involved_in
  review:
    summary: >-
      This annotation may reflect a valid cell-state, localization, or signaling consequence,
      but it is peripheral to ABCA7 core lipid transporter/phagocytic function.
    action: KEEP_AS_NON_CORE
    reason: >-
      Retain the annotation as non-core because it is plausible or experimentally
      observed, but not the primary evolved molecular role of ABCA7.
- term:
    id: GO:1902430
    label: negative regulation of amyloid-beta formation
  evidence_type: ISS
  original_reference_id: GO_REF:0000024
  qualifier: involved_in
  review:
    summary: >-
      ABCA7 loss-of-function data support a role in regulating APP endocytosis/processing
      and limiting amyloid-beta formation.
    action: ACCEPT
    reason: >-
      The term aligns with direct biochemical evidence or well-supported cellular
      consequences of ABCA7 lipid transport and membrane-trafficking activity.
- term:
    id: GO:1903898
    label: negative regulation of PERK-mediated unfolded protein response
  evidence_type: ISS
  original_reference_id: GO_REF:0000024
  qualifier: involved_in
  review:
    summary: >-
      This annotation may reflect a valid cell-state, localization, or signaling consequence,
      but it is peripheral to ABCA7 core lipid transporter/phagocytic function.
    action: KEEP_AS_NON_CORE
    reason: >-
      Retain the annotation as non-core because it is plausible or experimentally
      observed, but not the primary evolved molecular role of ABCA7.
- term:
    id: GO:0090554
    label: phosphatidylcholine floppase activity
  evidence_type: IDA
  original_reference_id: PMID:24097981
  qualifier: enables
  review:
    summary: >-
      This molecular-function annotation captures the core ABCA7 activity: ATP-coupled
      intramembrane phospholipid transport/floppase activity and apoA-I-associated
      phospholipid efflux.
    action: ACCEPT
    reason: >-
      The term aligns with direct biochemical evidence or well-supported cellular
      consequences of ABCA7 lipid transport and membrane-trafficking activity.
- term:
    id: GO:0090556
    label: phosphatidylserine floppase activity
  evidence_type: IDA
  original_reference_id: PMID:24097981
  qualifier: enables
  review:
    summary: >-
      This molecular-function annotation captures the core ABCA7 activity: ATP-coupled
      intramembrane phospholipid transport/floppase activity and apoA-I-associated
      phospholipid efflux.
    action: ACCEPT
    reason: >-
      The term aligns with direct biochemical evidence or well-supported cellular
      consequences of ABCA7 lipid transport and membrane-trafficking activity.
- term:
    id: GO:1900223
    label: positive regulation of amyloid-beta clearance
  evidence_type: ISS
  original_reference_id: GO_REF:0000024
  qualifier: involved_in
  review:
    summary: >-
      This process is consistent with ABCA7-dependent membrane trafficking and phagocytic
      cup biology in macrophage/microglial contexts.
    action: ACCEPT
    reason: >-
      The term aligns with direct biochemical evidence or well-supported cellular
      consequences of ABCA7 lipid transport and membrane-trafficking activity.
- term:
    id: GO:0140328
    label: floppase activity
  evidence_type: IDA
  original_reference_id: PMID:24097981
  qualifier: enables
  review:
    summary: >-
      This molecular-function annotation captures the core ABCA7 activity: ATP-coupled
      intramembrane phospholipid transport/floppase activity and apoA-I-associated
      phospholipid efflux.
    action: ACCEPT
    reason: >-
      The term aligns with direct biochemical evidence or well-supported cellular
      consequences of ABCA7 lipid transport and membrane-trafficking activity.
- term:
    id: GO:0044857
    label: plasma membrane raft organization
  evidence_type: ISS
  original_reference_id: GO_REF:0000024
  qualifier: involved_in
  review:
    summary: >-
      This annotation may reflect a valid cell-state, localization, or signaling consequence,
      but it is peripheral to ABCA7 core lipid transporter/phagocytic function.
    action: KEEP_AS_NON_CORE
    reason: >-
      Retain the annotation as non-core because it is plausible or experimentally
      observed, but not the primary evolved molecular role of ABCA7.
- term:
    id: GO:2000010
    label: positive regulation of protein localization to cell surface
  evidence_type: ISS
  original_reference_id: GO_REF:0000024
  qualifier: involved_in
  review:
    summary: >-
      This annotation may reflect a valid cell-state, localization, or signaling consequence,
      but it is peripheral to ABCA7 core lipid transporter/phagocytic function.
    action: KEEP_AS_NON_CORE
    reason: >-
      Retain the annotation as non-core because it is plausible or experimentally
      observed, but not the primary evolved molecular role of ABCA7.
- term:
    id: GO:0097386
    label: glial cell projection
  evidence_type: ISS
  original_reference_id: GO_REF:0000024
  qualifier: located_in
  review:
    summary: >-
      This annotation may reflect a valid cell-state, localization, or signaling consequence,
      but it is peripheral to ABCA7 core lipid transporter/phagocytic function.
    action: KEEP_AS_NON_CORE
    reason: >-
      Retain the annotation as non-core because it is plausible or experimentally
      observed, but not the primary evolved molecular role of ABCA7.
- term:
    id: GO:0150094
    label: amyloid-beta clearance by cellular catabolic process
  evidence_type: ISS
  original_reference_id: GO_REF:0000024
  qualifier: involved_in
  review:
    summary: >-
      This process is consistent with ABCA7-dependent membrane trafficking and phagocytic
      cup biology in macrophage/microglial contexts.
    action: ACCEPT
    reason: >-
      The term aligns with direct biochemical evidence or well-supported cellular
      consequences of ABCA7 lipid transport and membrane-trafficking activity.
- term:
    id: GO:0034205
    label: amyloid-beta formation
  evidence_type: IMP
  original_reference_id: PMID:26260791
  qualifier: involved_in
  review:
    summary: >-
      ABCA7 loss increases APP endocytosis and amyloid-beta production, so the evidence
      supports regulation, especially negative regulation by functional ABCA7, rather
      than simple involvement in amyloid-beta formation.
    action: MODIFY
    proposed_replacement_terms: *id001
    reason: >-
      Use directional regulation terms to avoid implying ABCA7 is a positive component
      of amyloid-beta formation.
- term:
    id: GO:0045806
    label: negative regulation of endocytosis
  evidence_type: ISS
  original_reference_id: GO_REF:0000024
  qualifier: involved_in
  review:
    summary: >-
      This process is consistent with ABCA7-dependent membrane trafficking and phagocytic
      cup biology in macrophage/microglial contexts.
    action: ACCEPT
    reason: >-
      The term aligns with direct biochemical evidence or well-supported cellular
      consequences of ABCA7 lipid transport and membrane-trafficking activity.
- term:
    id: GO:1902991
    label: regulation of amyloid precursor protein catabolic process
  evidence_type: IMP
  original_reference_id: PMID:26260791
  qualifier: involved_in
  review:
    summary: >-
      ABCA7 loss-of-function data support a role in regulating APP endocytosis/processing
      and limiting amyloid-beta formation.
    action: ACCEPT
    reason: >-
      The term aligns with direct biochemical evidence or well-supported cellular
      consequences of ABCA7 lipid transport and membrane-trafficking activity.
- term:
    id: GO:0045332
    label: phospholipid translocation
  evidence_type: IDA
  original_reference_id: PMID:24097981
  qualifier: involved_in
  review:
    summary: >-
      This annotation is part of the core lipid transport, phospholipid efflux, or
      membrane-trafficking function of ABCA7.
    action: ACCEPT
    reason: >-
      The term aligns with direct biochemical evidence or well-supported cellular
      consequences of ABCA7 lipid transport and membrane-trafficking activity.
- term:
    id: GO:0007613
    label: memory
  evidence_type: ISS
  original_reference_id: GO_REF:0000024
  qualifier: involved_in
  review:
    summary: >-
      Learning and memory phenotypes are downstream organismal consequences, not direct
      ABCA7 molecular functions.
    action: KEEP_AS_NON_CORE
    reason: >-
      Retain the annotation as non-core because it is plausible or experimentally
      observed, but not the primary evolved molecular role of ABCA7.
- term:
    id: GO:0009986
    label: cell surface
  evidence_type: ISS
  original_reference_id: GO_REF:0000024
  qualifier: located_in
  review:
    summary: >-
      This location fits ABCA7 function as a multipass membrane lipid transporter
      active at plasma, Golgi/endosomal, ruffle, and phagocytic-cup membranes.
    action: ACCEPT
    reason: >-
      The term aligns with direct biochemical evidence or well-supported cellular
      consequences of ABCA7 lipid transport and membrane-trafficking activity.
- term:
    id: GO:0010875
    label: positive regulation of cholesterol efflux
  evidence_type: ISS
  original_reference_id: GO_REF:0000024
  qualifier: involved_in
  review:
    summary: >-
      ABCA7 can support apoA-I-associated cholesterol/HDL-like outputs in overexpression
      systems, but phospholipid/lysoPC transport is the better-supported core activity.
    action: KEEP_AS_NON_CORE
    reason: >-
      Retain the annotation as non-core because it is plausible or experimentally
      observed, but not the primary evolved molecular role of ABCA7.
- term:
    id: GO:0034504
    label: protein localization to nucleus
  evidence_type: ISS
  original_reference_id: GO_REF:0000024
  qualifier: involved_in
  review:
    summary: >-
      Protein localization to nucleus is not a clear ABCA7 core function and appears
      to be a downstream or indirect inference.
    action: MARK_AS_OVER_ANNOTATED
    reason: >-
      For a multipass membrane lipid transporter, nuclear protein-localization terms
      are not supported as a direct molecular function from the available evidence.
- term:
    id: GO:0042985
    label: negative regulation of amyloid precursor protein biosynthetic process
  evidence_type: ISS
  original_reference_id: GO_REF:0000024
  qualifier: involved_in
  review:
    summary: >-
      ABCA7 affects APP processing and amyloid-beta output, but the available evidence
      is about APP catabolic/endocytic processing rather than APP biosynthesis.
    action: MODIFY
    proposed_replacement_terms:
    - id: GO:1902430
      label: negative regulation of amyloid-beta formation
    - id: GO:1902991
      label: regulation of amyloid precursor protein catabolic process
    reason: >-
      Represent the biology with APP catabolic-process and amyloid-beta formation
      regulation terms instead of APP biosynthesis.
- term:
    id: GO:0050766
    label: positive regulation of phagocytosis
  evidence_type: ISS
  original_reference_id: GO_REF:0000024
  qualifier: involved_in
  review:
    summary: >-
      This process is consistent with ABCA7-dependent membrane trafficking and phagocytic
      cup biology in macrophage/microglial contexts.
    action: ACCEPT
    reason: >-
      The term aligns with direct biochemical evidence or well-supported cellular
      consequences of ABCA7 lipid transport and membrane-trafficking activity.
- term:
    id: GO:0070374
    label: positive regulation of ERK1 and ERK2 cascade
  evidence_type: ISS
  original_reference_id: GO_REF:0000024
  qualifier: involved_in
  review:
    summary: >-
      This annotation may reflect a valid cell-state, localization, or signaling consequence,
      but it is peripheral to ABCA7 core lipid transporter/phagocytic function.
    action: KEEP_AS_NON_CORE
    reason: >-
      Retain the annotation as non-core because it is plausible or experimentally
      observed, but not the primary evolved molecular role of ABCA7.
- term:
    id: GO:1901076
    label: positive regulation of engulfment of apoptotic cell
  evidence_type: ISS
  original_reference_id: GO_REF:0000024
  qualifier: involved_in
  review:
    summary: >-
      This process is consistent with ABCA7-dependent membrane trafficking and phagocytic
      cup biology in macrophage/microglial contexts.
    action: ACCEPT
    reason: >-
      The term aligns with direct biochemical evidence or well-supported cellular
      consequences of ABCA7 lipid transport and membrane-trafficking activity.
- term:
    id: GO:1902995
    label: positive regulation of phospholipid efflux
  evidence_type: ISS
  original_reference_id: GO_REF:0000024
  qualifier: involved_in
  review:
    summary: >-
      This annotation is part of the core lipid transport, phospholipid efflux, or
      membrane-trafficking function of ABCA7.
    action: ACCEPT
    reason: >-
      The term aligns with direct biochemical evidence or well-supported cellular
      consequences of ABCA7 lipid transport and membrane-trafficking activity.
- term:
    id: GO:0005886
    label: plasma membrane
  evidence_type: IDA
  original_reference_id: PMID:14570867
  qualifier: located_in
  review:
    summary: >-
      This location fits ABCA7 function as a multipass membrane lipid transporter
      active at plasma, Golgi/endosomal, ruffle, and phagocytic-cup membranes.
    action: ACCEPT
    reason: >-
      The term aligns with direct biochemical evidence or well-supported cellular
      consequences of ABCA7 lipid transport and membrane-trafficking activity.
- term:
    id: GO:0033344
    label: cholesterol efflux
  evidence_type: IDA
  original_reference_id: PMID:14570867
  qualifier: involved_in
  review:
    summary: >-
      ABCA7 can support apoA-I-associated cholesterol/HDL-like outputs in overexpression
      systems, but phospholipid/lysoPC transport is the better-supported core activity.
    action: KEEP_AS_NON_CORE
    reason: >-
      Retain the annotation as non-core because it is plausible or experimentally
      observed, but not the primary evolved molecular role of ABCA7.
- term:
    id: GO:0033700
    label: phospholipid efflux
  evidence_type: IDA
  original_reference_id: PMID:14570867
  qualifier: involved_in
  review:
    summary: >-
      This annotation is part of the core lipid transport, phospholipid efflux, or
      membrane-trafficking function of ABCA7.
    action: ACCEPT
    reason: >-
      The term aligns with direct biochemical evidence or well-supported cellular
      consequences of ABCA7 lipid transport and membrane-trafficking activity.
- term:
    id: GO:0034188
    label: apolipoprotein A-I receptor activity
  evidence_type: IDA
  original_reference_id: PMID:14570867
  qualifier: enables
  review:
    summary: >-
      This molecular-function annotation captures the core ABCA7 activity: ATP-coupled
      intramembrane phospholipid transport/floppase activity and apoA-I-associated
      phospholipid efflux.
    action: ACCEPT
    reason: >-
      The term aligns with direct biochemical evidence or well-supported cellular
      consequences of ABCA7 lipid transport and membrane-trafficking activity.
- term:
    id: GO:0034380
    label: high-density lipoprotein particle assembly
  evidence_type: IDA
  original_reference_id: PMID:14570867
  qualifier: involved_in
  review:
    summary: >-
      ABCA7 can support apoA-I-associated cholesterol/HDL-like outputs in overexpression
      systems, but phospholipid/lysoPC transport is the better-supported core activity.
    action: KEEP_AS_NON_CORE
    reason: >-
      Retain the annotation as non-core because it is plausible or experimentally
      observed, but not the primary evolved molecular role of ABCA7.
- term:
    id: GO:0038027
    label: apolipoprotein A-I-mediated signaling pathway
  evidence_type: IDA
  original_reference_id: PMID:14570867
  qualifier: involved_in
  review:
    summary: >-
      The supporting experiment describes apoA-I binding and lipid efflux/HDL-like
      particle generation, not a signaling pathway as the primary function.
    action: MODIFY
    proposed_replacement_terms:
    - id: GO:0034188
      label: apolipoprotein A-I receptor activity
    - id: GO:0033700
      label: phospholipid efflux
    - id: GO:0034380
      label: high-density lipoprotein particle assembly
    reason: >-
      Replace with apoA-I receptor activity and phospholipid efflux/HDL assembly terms
      that match the experimental readout.
- term:
    id: GO:0005886
    label: plasma membrane
  evidence_type: TAS
  original_reference_id: Reactome:R-HSA-382553
  qualifier: located_in
  review:
    summary: >-
      This location fits ABCA7 function as a multipass membrane lipid transporter
      active at plasma, Golgi/endosomal, ruffle, and phagocytic-cup membranes.
    action: ACCEPT
    reason: >-
      The term aligns with direct biochemical evidence or well-supported cellular
      consequences of ABCA7 lipid transport and membrane-trafficking activity.
references:
- id: GO_REF:0000002
  title: Gene Ontology annotation through association of InterPro records with
    GO terms
  findings: []
- id: PMID:38135757
  title: ABCA7 deficiency causes neuronal dysregulation by altering mitochondrial lipid
    metabolism.
  findings: []
  reference_review:
    relevance: MEDIUM
    correctness: VERIFIED
    review_notes: PubMed/PMC-verified (PMID:38135757, Molecular Psychiatry 2024, Kawatani
      et al.). ABCA7-knockout human iPSC neurons/organoids show reduced mitochondrial
      phosphatidylglycerol and cardiolipin with impaired respiration, rescued by PG/NMN;
      informs a possible mitochondrial-lipid process not yet in GOA (recorded as a
      suggested question/experiment rather than a new annotation).
- id: file:human/ABCA7/ABCA7-deep-research-falcon.md
  title: Falcon deep research report for ABCA7
  findings:
  - statement: Falcon deep research corroborates ABCA7 as an ATP-driven phospholipid
      floppase/transporter (cryo-EM open/closed states) and surfaces a mitochondrial
      phospholipid (phosphatidylglycerol/cardiolipin) phenotype on ABCA7 loss.
    supporting_text: ABCA7 knockout reduced phosphatidylglycerol and cardiolipin; phosphatidylglycerol
      or NMN partially rescued phenotypes.
- id: GO_REF:0000003
  title: Gene Ontology annotation based on Enzyme Commission mapping
  findings: []
- id: GO_REF:0000024
  title: Manual transfer of experimentally-verified manual GO annotation data to
    orthologs by curator judgment of sequence similarity
  findings: []
- id: GO_REF:0000033
  title: Annotation inferences using phylogenetic trees
  findings: []
- id: GO_REF:0000044
  title: Gene Ontology annotation based on UniProtKB/Swiss-Prot Subcellular 
    Location vocabulary mapping, accompanied by conservative changes to GO terms
    applied by UniProt
  findings: []
- id: GO_REF:0000052
  title: Gene Ontology annotation based on curation of immunofluorescence data
  findings: []
- id: GO_REF:0000116
  title: Automatic Gene Ontology annotation based on Rhea mapping
  findings: []
- id: GO_REF:0000117
  title: Electronic Gene Ontology annotations created by ARBA machine learning 
    models
  findings: []
- id: GO_REF:0000120
  title: Combined Automated Annotation using Multiple IEA Methods
  findings: []
- id: PMID:12917409
  title: ATP-binding cassette transporter A7 (ABCA7) binds apolipoprotein A-I 
    and mediates cellular phospholipid but not cholesterol efflux.
  findings: []
  reference_review:
    relevance: HIGH
    correctness: VERIFIED
    review_notes: Cached abstract supports ABCA7 binding apolipoprotein A-I and
      mediating phospholipid efflux, while distinguishing this from cholesterol
      efflux.
- id: PMID:14570867
  title: Human ABCA7 supports apolipoprotein-mediated release of cellular 
    cholesterol and phospholipid to generate high density lipoprotein.
  findings: []
  reference_review:
    relevance: MEDIUM
    correctness: VERIFIED
    review_notes: Cached abstract supports apolipoprotein-mediated lipid 
      release in ABCA7 overexpression systems; useful but less substrate-
      specific than reconstituted phospholipid transport evidence.
- id: PMID:14592415
  title: Posttranscriptional regulation of human ABCA7 and its function for the 
    apoA-I-dependent lipid release.
  findings: []
- id: PMID:24097981
  title: Differential phospholipid substrates and directional transport by 
    ATP-binding cassette proteins ABCA1, ABCA7, and ABCA4 and disease-causing 
    mutants.
  findings: []
  reference_review:
    relevance: HIGH
    correctness: VERIFIED
    review_notes: Cached abstract directly supports ATP-dependent ABCA7 
      phospholipid transport, especially preferential phosphatidylserine export.
- id: PMID:26260791
  title: ATP-binding cassette transporter A7 (ABCA7) loss of function alters 
    Alzheimer amyloid processing.
  findings: []
  reference_review:
    relevance: HIGH
    correctness: VERIFIED
    review_notes: Cached full-text record supports ABCA7 effects on membrane 
      trafficking, APP endocytosis, beta-secretase cleavage, and amyloid-beta
      production.
- id: PMID:28373057
  title: Lysophosphatidylcholine export by human ABCA7.
  findings: []
  reference_review:
    relevance: HIGH
    correctness: VERIFIED
    review_notes: Cached abstract supports ABCA7 export of choline 
      phospholipids and lysophosphatidylcholine, including brain-relevant 
      substrate framing.
- id: PMID:36115835
  title: Quantitative fragmentomics allow affinity mapping of interactomes.
  findings: []
- id: Reactome:R-HSA-1369062
  title: ABC transporters in lipid homeostasis
  findings: []
- id: Reactome:R-HSA-382553
  title: ABCA7:Apo1A-mediated phospholipid efflux
  findings: []
core_functions:
- molecular_function:
    id: GO:0140326
    label: ATPase-coupled intramembrane lipid transporter activity
  description: >-
    ABCA7 uses ATP hydrolysis to move phospholipids across membrane leaflets, with
    direct evidence for phosphatidylserine and phosphatidylcholine/lysophosphatidylcholine
    transport. Through this membrane lipid-transport and trafficking activity, ABCA7
    also supports phagocytic membrane organization, apoptotic-cell engulfment, and
    amyloid-beta clearance/processing in macrophage and microglial contexts.
  directly_involved_in:
  - id: GO:0045332
    label: phospholipid translocation
  - id: GO:0033700
    label: phospholipid efflux
  - id: GO:0006869
    label: lipid transport
  - id: GO:0055085
    label: transmembrane transport
  - id: GO:0050766
    label: positive regulation of phagocytosis
  - id: GO:1901076
    label: positive regulation of engulfment of apoptotic cell
  - id: GO:0150094
    label: amyloid-beta clearance by cellular catabolic process
  - id: GO:1900223
    label: positive regulation of amyloid-beta clearance
  - id: GO:1902430
    label: negative regulation of amyloid-beta formation
  - id: GO:0045806
    label: negative regulation of endocytosis
  - id: GO:1902991
    label: regulation of amyloid precursor protein catabolic process
  locations:
  - id: GO:0005886
    label: plasma membrane
  - id: GO:0000139
    label: Golgi membrane
  - id: GO:0031901
    label: early endosome membrane
  - id: GO:0032587
    label: ruffle membrane
  - id: GO:0001891
    label: phagocytic cup
  supported_by:
  - reference_id: file:human/ABCA7/ABCA7-deep-research-falcon.md
    supporting_text: ABCA7 knockout reduced phosphatidylglycerol and cardiolipin; phosphatidylglycerol
      or NMN partially rescued phenotypes.
  - reference_id: PMID:24097981
    supporting_text: >-
      ABCA7 preferentially exported phosphatidylserine
  - reference_id: PMID:24097981
    supporting_text: >-
      The same phospholipids stimulated the ATPase activity of these ABCA transporters
  - reference_id: PMID:28373057
    supporting_text: >-
      ABCA7 exported choline phospholipids in the presence of apoA-I and apoE
  - reference_id: PMID:26260791
    supporting_text: >-
      ABCA7 has been shown to mediate phagocytosis and affect membrane trafficking
  - reference_id: PMID:26260791
    supporting_text: >-
      more rapid endocytosis of APP in ABCA7 knock-out cells that is mechanistically
      consistent with the increased Aβ production
  - reference_id: PMID:26260791
    supporting_text: >-
      uptake and clearance of aggregated Aβ plaques and aggregates
- molecular_function:
    id: GO:0034188
    label: apolipoprotein A-I receptor activity
  description: >-
    ABCA7 binds apolipoprotein A-I and supports apolipoprotein-mediated phospholipid
    efflux; cholesterol efflux and HDL assembly occur in some expression systems but
    are less consistent than phospholipid export.
  directly_involved_in:
  - id: GO:0033700
    label: phospholipid efflux
  - id: GO:1902995
    label: positive regulation of phospholipid efflux
  - id: GO:0034380
    label: high-density lipoprotein particle assembly
  locations:
  - id: GO:0005886
    label: plasma membrane
  - id: GO:0009986
    label: cell surface
  supported_by:
  - reference_id: PMID:12917409
    supporting_text: >-
      ABCA7 has the ability to bind apolipoproteins and promote efflux of cellular
      phospholipids without cholesterol
  - reference_id: PMID:14570867
    supporting_text: >-
      Time-dependent release of cholesterol and phospholipid by apolipoprotein A (apoA)-I
      was parallel both with ABCA1 and with ABCA7
proposed_new_terms: []
suggested_questions:
- question: >-
    Which ABCA7 Alzheimer-risk variants impair phospholipid transport directly, and
    which primarily disrupt localization, apoA-I interaction, phagocytic-cup recruitment,
    or APP endocytic regulation?
  experts:
  - ABC transporter experts
  - Alzheimer genetics experts
- question: >-
    Should cholesterol efflux and HDL assembly remain curated for ABCA7 as context-specific
    outputs, or should they be deemphasized in favor of phospholipid/lysophospholipid
    efflux?
  experts:
  - lipid transport curators
  - GO lipid biology curators
- question: >-
    How should GO distinguish ABCA7-dependent amyloid-beta clearance from ABCA7-dependent
    regulation of APP endocytosis and amyloid-beta production?
  experts:
  - microglia biology experts
  - APP processing experts
- question: >-
    Is ABCA7's effect on mitochondria-related phospholipids (phosphatidylglycerol and
    cardiolipin) a direct consequence of its lipid-transport activity or an indirect
    downstream effect, and does it warrant a distinct process annotation? ABCA7 knockout
    iPSC-derived neurons/organoids show reduced phosphatidylglycerol and cardiolipin,
    mitochondrial dysfunction, and impaired respiration, rescued by phosphatidylglycerol
    or NMN [PMID:38135757].
  experts:
  - mitochondrial lipid biology experts
  - Alzheimer genetics experts
suggested_experiments:
- description: >-
    Measure phosphatidylserine, phosphatidylcholine, lysoPC, cholesterol, and apoA-I-dependent
    efflux in endogenous ABCA7 wild-type, knockout, and Alzheimer-risk variant human
    microglia and macrophages.
  hypothesis: >-
    ABCA7 risk variants primarily impair phospholipid/lysophospholipid transport rather
    than canonical cholesterol efflux.
  experiment_type: endogenous variant lipid efflux and floppase assay
- description: >-
    Track ABCA7, LRP1, APP, and amyloid-beta cargo localization during apoptotic-cell
    engulfment and amyloid uptake using live imaging and compartment-resolved proteomics.
  hypothesis: >-
    ABCA7 regulates amyloid outcomes through phagocytic/endocytic membrane organization
    and APP endocytosis rather than by directly binding amyloid-beta as a receptor.
  experiment_type: live-cell phagocytosis and APP trafficking assay
- description: >-
    Compare canonical isoform 1 and ER-localized isoform 2 for apoA-I-dependent efflux,
    ATPase-coupled phospholipid transport, and phagocytic-cup recruitment.
  hypothesis: >-
    Isoform-specific localization explains differences between cell-surface lipid
    efflux activity and ER-retained inactive or lower-activity ABCA7 pools.
  experiment_type: isoform-resolved localization and lipid transport assay
- description: >-
    Perform compartment-resolved lipidomics (mitochondrial vs plasma-membrane fractions)
    in ABCA7-knockout and isogenic-control human neurons to determine whether the loss
    of mitochondrial phosphatidylglycerol/cardiolipin reflects altered transport of a
    specific lipid species versus a secondary metabolic adaptation, and test rescue
    by targeted phosphatidylglycerol supplementation.
  hypothesis: >-
    ABCA7 loss reduces mitochondrial phosphatidylglycerol and cardiolipin and thereby
    impairs oxidative phosphorylation, contributing to neuronal dysfunction in Alzheimer
    risk.
  experiment_type: subcellular lipidomics and mitochondrial respirometry