Deep research status: just deep-research-falcon human ABCA1 --fallback perplexity-lite was launched after just fetch-gene human ABCA1 and just fetch-gene-pmids human ABCA1; it timed out after 180 seconds without writing a provider artifact. This note records the local evidence used for the first-pass GO review.
ABCA1 is a multipass ABCA-family transporter whose defining function is ATP-coupled lipid movement at the plasma membrane/endosomal system. UniProt summarizes the molecular role as phospholipid translocation coupled to ATP hydrolysis [file:human/ABCA1/ABCA1-uniprot.txt "Catalyzes the translocation of specific phospholipids"] and apolipoprotein-dependent HDL biogenesis [file:human/ABCA1/ABCA1-uniprot.txt "transfer to apolipoproteins"]. Direct reconstitution assays support phosphatidylcholine, phosphatidylserine, and sphingomyelin transport PMID:24097981 and show lipid-stimulated ATPase activity PMID:24097981.
ABCA1-dependent HDL formation is tied to apoA-I and other exchangeable apolipoproteins. Tangier-disease studies show that loss or inhibition of ABC1 reduces apolipoprotein-mediated lipid efflux PMID:10525055 and place the protein at the plasma membrane PMID:10525055. ApoA-I extracellular-loop mutants impair cholesterol efflux and apoA-I interaction PMID:12084722 PMID:12084722. A later structural/mechanistic study supports extracellular phospholipid extraction/export PMID:35974019.
ABCA1 is also strongly tied to cholesterol efflux and apolipoprotein E lipidation. The original Tangier/familial HDL-deficiency genetics paper named ABC1/CERP for intracellular cholesterol transport PMID:10431236 PMID:10431236. ApoE can bind ABCA1 and induce cholesterol efflux, generating nascent apoE/cholesterol/phospholipid particles PMID:14754908 PMID:14754908. This supports Alzheimer-relevant ABCA1 placement in APOE lipidation and lipid homeostasis modules.
Accept as core: ABC transporter/ATP binding and hydrolysis terms, ATPase-coupled transmembrane/lipid-carrier activity, floppase/phospholipid transfer terms, cholesterol transport/efflux/homeostasis, apoA-I/apolipoprotein binding or receptor activity, HDL assembly/reverse cholesterol transport, and direct plasma-membrane/endosomal membrane localizations.
Keep as non-core: experimentally plausible context terms such as apoA-I-triggered Cdc42/GPCR signaling, inflammatory/cytokine or LPS response, endothelial shear/LDL/nutrient response, ER/Golgi/perinuclear trafficking, lysosome or platelet dense-granule phenotypes, protein secretion/signal release, and phagocytic vesicle/membrane raft localization. These are credible ABCA1 biology but not the primary molecular function.
Mark as over-annotated: generic protein binding, broad signaling-receptor or ATPase-binding annotations, and other partner-binding labels that do not capture ABCA1's informative activity.
Modify: broad or misleading transport labels should be redirected to lipid-specific terms, especially cholesterol transport/transfer or phospholipid translocation/ATPase-coupled intramembrane lipid carrier activity.
The second-pass audit confirmed the existing ABCA1 review and manual reference metadata. No annotation action changes were needed: ABCA1 remains curated as an ATP-driven phospholipid/cholesterol transporter that enables apolipoprotein-dependent lipid efflux, HDL biogenesis, and APOE lipidation, with inflammatory, signaling, vesicle, secretion, trafficking, and generic binding annotations kept non-core or over-annotated unless they directly reflect lipid-transport biology.