FASLG

UniProt ID: P48023
Organism: Homo sapiens
Review Status: COMPLETE
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Gene Description

FASLG (Fas ligand, CD95L, TNFSF6) is a type II transmembrane TNF-family cytokine. Its trimeric extracellular TNF-homology domain binds the FAS/CD95 death receptor on neighboring cells to assemble a FADD- and initiator-caspase-containing DISC and trigger extrinsic apoptotic signaling during immune homeostasis, cytotoxic lymphocyte killing, activation-induced T-cell death, and peripheral tolerance. The membrane precursor traffics through secretory lysosomes to the cell surface, can be shed to a soluble receptor-binding ectodomain, and can be further cleaved by ADAM10 and SPPL2A to liberate a nuclear FasL intracellular domain with transcriptional effects.

Existing Annotations Review

GO Term Evidence Action Reason
GO:0000122 negative regulation of transcription by RNA polymerase II
IDA
PMID:17557115
The Fas ligand intracellular domain is released by ADAM10 an...
KEEP AS NON CORE
Summary: The ADAM10/SPPL2A-generated FasL intracellular domain can enter the nucleus and inhibit transcription.
Reason: This is a valid activity of a processed FASLG fragment, but it is separable from the core membrane-ligand cytokine activity that initiates FAS apoptosis.
Supporting Evidence:
PMID:17557115
the nucleus and is capable of inhibiting gene transcription
GO:0005102 signaling receptor binding
IEA
GO_REF:0000117
MODIFY
Summary: FASLG binds the FAS/CD95 death receptor; the seeded term is broader than the supported receptor class.
Reason: FASLG is a TNF-family ligand whose informative binding activity is engagement of the FAS death receptor, not generic signaling-receptor or TNF-receptor-superfamily binding.
Proposed replacements: death receptor binding
Supporting Evidence:
PMID:7826947
induces apoptosis by binding to its receptor, Fas
GO:0005102 signaling receptor binding
TAS
PMID:7826947
Human Fas ligand: gene structure, chromosomal location and s...
MODIFY
Summary: FASLG binds the FAS/CD95 death receptor; the seeded term is broader than the supported receptor class.
Reason: FASLG is a TNF-family ligand whose informative binding activity is engagement of the FAS death receptor, not generic signaling-receptor or TNF-receptor-superfamily binding.
Proposed replacements: death receptor binding
Supporting Evidence:
PMID:7826947
induces apoptosis by binding to its receptor, Fas
GO:0005123 death receptor binding
IEA
GO_REF:0000107
ACCEPT
Summary: FASLG binds the FAS/CD95 death receptor through its extracellular TNF-homology domain.
Reason: Death receptor binding is the precise molecular function for the FASLG:FAS ligand-receptor pair.
Supporting Evidence:
PMID:9228058
a molecular model of the FasL homotrimer bound to three Fas molecules
GO:0005125 cytokine activity
IBA
GO_REF:0000033
ACCEPT
Summary: FASLG is a pro-apoptotic TNF-family cytokine that can trigger FAS-dependent death-receptor signaling.
Reason: Cytokine activity is the GO-CAM molecular-function choice for the extracellular FASLG ligand step and is supported by FASLG-dependent apoptosis assays.
Supporting Evidence:
PMID:9333124
Activated PBMCs expressed Fas ligand (FasL) strongly on their surface
GO:0005125 cytokine activity
IDA
PMID:9333124
Fas and Fas ligand interaction is necessary for human osteob...
ACCEPT
Summary: FASLG is a pro-apoptotic TNF-family cytokine that can trigger FAS-dependent death-receptor signaling.
Reason: Cytokine activity is the GO-CAM molecular-function choice for the extracellular FASLG ligand step and is supported by FASLG-dependent apoptosis assays.
Supporting Evidence:
PMID:9333124
Activated PBMCs expressed Fas ligand (FasL) strongly on their surface
GO:0005164 tumor necrosis factor receptor binding
IEA
GO_REF:0000120
MODIFY
Summary: FASLG binds the FAS/CD95 death receptor; the seeded term is broader than the supported receptor class.
Reason: FASLG is a TNF-family ligand whose informative binding activity is engagement of the FAS death receptor, not generic signaling-receptor or TNF-receptor-superfamily binding.
Proposed replacements: death receptor binding
Supporting Evidence:
PMID:7826947
induces apoptosis by binding to its receptor, Fas
GO:0005515 protein binding
IPI
PMID:12198154
Caspase-10 is recruited to and activated at the native TRAIL...
REMOVE
Summary: PMID:12198154 analyzes CASP10 recruitment to native CD95 and TRAIL DISCs, not a direct FASLG-CASP8 molecular function.
Reason: FASLG is the extracellular ligand that activates FAS; CASP8 is recruited cytosolically by FADD, so the imported generic protein-binding edge is indirect and should not stand as a FASLG molecular function.
GO:0005515 protein binding
IPI
PMID:12887920
Induction of TNF receptor I-mediated apoptosis via two seque...
UNDECIDED
Summary: PMID:12887920 is TNFR1-centered and the cached abstract does not expose the FASLG-specific IPI behind this row.
Reason: The annotation may come from a full-text comparison to CD95 signaling, but the local abstract is insufficient to verify the asserted FASLG partner edge.
GO:0005515 protein binding
IPI
PMID:12887920
Induction of TNF receptor I-mediated apoptosis via two seque...
UNDECIDED
Summary: PMID:12887920 is TNFR1-centered and the cached abstract does not expose the FASLG-specific IPI behind this row.
Reason: The annotation may come from a full-text comparison to CD95 signaling, but the local abstract is insufficient to verify the asserted FASLG partner edge.
GO:0005515 protein binding
IPI
PMID:12887920
Induction of TNF receptor I-mediated apoptosis via two seque...
UNDECIDED
Summary: PMID:12887920 is TNFR1-centered and the cached abstract does not expose the FASLG-specific IPI behind this row.
Reason: The annotation may come from a full-text comparison to CD95 signaling, but the local abstract is insufficient to verify the asserted FASLG partner edge.
GO:0005515 protein binding
IPI
PMID:16318909
Regulation of FasL expression: a SH3 domain containing prote...
REMOVE
Summary: FCH/SH3 family proteins can associate with the FasL cytoplasmic tail and change FASLG intracellular localization.
Reason: The reported cytoplasmic-tail PPI is relevant to trafficking but leaves the row at uninformative generic protein binding and does not establish a FASLG molecular function more specific than the core FAS death-receptor ligand activity.
Supporting Evidence:
PMID:16318909
all tested members of this "FCH/SH3-family" co-precipitate FasL from transfectants
GO:0005515 protein binding
IPI
PMID:16318909
Regulation of FasL expression: a SH3 domain containing prote...
REMOVE
Summary: FCH/SH3 family proteins can associate with the FasL cytoplasmic tail and change FASLG intracellular localization.
Reason: The reported cytoplasmic-tail PPI is relevant to trafficking but leaves the row at uninformative generic protein binding and does not establish a FASLG molecular function more specific than the core FAS death-receptor ligand activity.
Supporting Evidence:
PMID:16318909
all tested members of this "FCH/SH3-family" co-precipitate FasL from transfectants
GO:0005515 protein binding
IPI
PMID:16318909
Regulation of FasL expression: a SH3 domain containing prote...
REMOVE
Summary: FCH/SH3 family proteins can associate with the FasL cytoplasmic tail and change FASLG intracellular localization.
Reason: The reported cytoplasmic-tail PPI is relevant to trafficking but leaves the row at uninformative generic protein binding and does not establish a FASLG molecular function more specific than the core FAS death-receptor ligand activity.
Supporting Evidence:
PMID:16318909
all tested members of this "FCH/SH3-family" co-precipitate FasL from transfectants
GO:0005515 protein binding
IPI
PMID:16318909
Regulation of FasL expression: a SH3 domain containing prote...
REMOVE
Summary: FCH/SH3 family proteins can associate with the FasL cytoplasmic tail and change FASLG intracellular localization.
Reason: The reported cytoplasmic-tail PPI is relevant to trafficking but leaves the row at uninformative generic protein binding and does not establish a FASLG molecular function more specific than the core FAS death-receptor ligand activity.
Supporting Evidence:
PMID:16318909
all tested members of this "FCH/SH3-family" co-precipitate FasL from transfectants
GO:0005515 protein binding
IPI
PMID:16318909
Regulation of FasL expression: a SH3 domain containing prote...
REMOVE
Summary: FCH/SH3 family proteins can associate with the FasL cytoplasmic tail and change FASLG intracellular localization.
Reason: The reported cytoplasmic-tail PPI is relevant to trafficking but leaves the row at uninformative generic protein binding and does not establish a FASLG molecular function more specific than the core FAS death-receptor ligand activity.
Supporting Evidence:
PMID:16318909
all tested members of this "FCH/SH3-family" co-precipitate FasL from transfectants
GO:0005515 protein binding
IPI
PMID:16318909
Regulation of FasL expression: a SH3 domain containing prote...
REMOVE
Summary: FCH/SH3 family proteins can associate with the FasL cytoplasmic tail and change FASLG intracellular localization.
Reason: The reported cytoplasmic-tail PPI is relevant to trafficking but leaves the row at uninformative generic protein binding and does not establish a FASLG molecular function more specific than the core FAS death-receptor ligand activity.
Supporting Evidence:
PMID:16318909
all tested members of this "FCH/SH3-family" co-precipitate FasL from transfectants
GO:0005515 protein binding
IPI
PMID:16318909
Regulation of FasL expression: a SH3 domain containing prote...
REMOVE
Summary: FCH/SH3 family proteins can associate with the FasL cytoplasmic tail and change FASLG intracellular localization.
Reason: The reported cytoplasmic-tail PPI is relevant to trafficking but leaves the row at uninformative generic protein binding and does not establish a FASLG molecular function more specific than the core FAS death-receptor ligand activity.
Supporting Evidence:
PMID:16318909
all tested members of this "FCH/SH3-family" co-precipitate FasL from transfectants
GO:0005515 protein binding
IPI
PMID:16498403
The role of receptor internalization in CD95 signaling.
MODIFY
Summary: The cited FASLG stimulation experiment supports the FASLG:FAS death-ligand interaction rather than a direct FASLG association with cytosolic DISC proteins.
Reason: These generic PPI imports are being narrowed to the direct receptor-binding activity that FASLG contributes upstream of FADD and CASP8 recruitment.
Proposed replacements: death receptor binding
Supporting Evidence:
PMID:7826947
induces apoptosis by binding to its receptor, Fas
GO:0005515 protein binding
IPI
PMID:16498403
The role of receptor internalization in CD95 signaling.
MODIFY
Summary: The cited FASLG stimulation experiment supports the FASLG:FAS death-ligand interaction rather than a direct FASLG association with cytosolic DISC proteins.
Reason: These generic PPI imports are being narrowed to the direct receptor-binding activity that FASLG contributes upstream of FADD and CASP8 recruitment.
Proposed replacements: death receptor binding
Supporting Evidence:
PMID:7826947
induces apoptosis by binding to its receptor, Fas
GO:0005515 protein binding
IPI
PMID:16595635
The adaptor protein Nck interacts with Fas ligand: Guiding t...
REMOVE
Summary: NCK1 binds the proline-rich FasL cytoplasmic tail and may guide FasL-positive secretory lysosomes.
Reason: The NCK1 edge is a trafficking adaptor interaction, not an informative stand-alone molecular function for FASLG.
Supporting Evidence:
PMID:16595635
Nck binds to the proline-rich portion of FasL
GO:0005515 protein binding
IPI
PMID:17761170
A proteomic screen reveals novel Fas ligand interacting prot...
REMOVE
Summary: The Schwann-cell proteomics paper identified FasL-associated trafficking/endocytosis proteins.
Reason: SNX18/AP2B1 associations describe candidate regulation of FasL trafficking and surface expression, not the extracellular death-receptor ligand activity curated as FASLG core function.
Supporting Evidence:
PMID:17761170
sorting nexin 18
GO:0005515 protein binding
IPI
PMID:17761170
A proteomic screen reveals novel Fas ligand interacting prot...
REMOVE
Summary: The Schwann-cell proteomics paper identified FasL-associated trafficking/endocytosis proteins.
Reason: SNX18/AP2B1 associations describe candidate regulation of FasL trafficking and surface expression, not the extracellular death-receptor ligand activity curated as FASLG core function.
Supporting Evidence:
PMID:17761170
sorting nexin 18
GO:0005515 protein binding
IPI
PMID:19807924
Identification of SH3 domain interaction partners of human F...
REMOVE
Summary: This row comes from a phage-display survey of SH3 domains against the FasL cytoplasmic region.
Reason: The screen identifies candidate SH3-mediated interactions but the generic protein-binding term is uninformative and the row does not establish a distinct FASLG molecular function.
Supporting Evidence:
PMID:19807924
screened a human SH3 domain phage display library
GO:0005515 protein binding
IPI
PMID:19807924
Identification of SH3 domain interaction partners of human F...
REMOVE
Summary: This row comes from a phage-display survey of SH3 domains against the FasL cytoplasmic region.
Reason: The screen identifies candidate SH3-mediated interactions but the generic protein-binding term is uninformative and the row does not establish a distinct FASLG molecular function.
Supporting Evidence:
PMID:19807924
screened a human SH3 domain phage display library
GO:0005515 protein binding
IPI
PMID:19807924
Identification of SH3 domain interaction partners of human F...
REMOVE
Summary: This row comes from a phage-display survey of SH3 domains against the FasL cytoplasmic region.
Reason: The screen identifies candidate SH3-mediated interactions but the generic protein-binding term is uninformative and the row does not establish a distinct FASLG molecular function.
Supporting Evidence:
PMID:19807924
screened a human SH3 domain phage display library
GO:0005515 protein binding
IPI
PMID:19807924
Identification of SH3 domain interaction partners of human F...
REMOVE
Summary: This row comes from a phage-display survey of SH3 domains against the FasL cytoplasmic region.
Reason: The screen identifies candidate SH3-mediated interactions but the generic protein-binding term is uninformative and the row does not establish a distinct FASLG molecular function.
Supporting Evidence:
PMID:19807924
screened a human SH3 domain phage display library
GO:0005515 protein binding
IPI
PMID:19807924
Identification of SH3 domain interaction partners of human F...
REMOVE
Summary: This row comes from a phage-display survey of SH3 domains against the FasL cytoplasmic region.
Reason: The screen identifies candidate SH3-mediated interactions but the generic protein-binding term is uninformative and the row does not establish a distinct FASLG molecular function.
Supporting Evidence:
PMID:19807924
screened a human SH3 domain phage display library
GO:0005515 protein binding
IPI
PMID:19807924
Identification of SH3 domain interaction partners of human F...
REMOVE
Summary: This row comes from a phage-display survey of SH3 domains against the FasL cytoplasmic region.
Reason: The screen identifies candidate SH3-mediated interactions but the generic protein-binding term is uninformative and the row does not establish a distinct FASLG molecular function.
Supporting Evidence:
PMID:19807924
screened a human SH3 domain phage display library
GO:0005515 protein binding
IPI
PMID:19807924
Identification of SH3 domain interaction partners of human F...
REMOVE
Summary: This row comes from a phage-display survey of SH3 domains against the FasL cytoplasmic region.
Reason: The screen identifies candidate SH3-mediated interactions but the generic protein-binding term is uninformative and the row does not establish a distinct FASLG molecular function.
Supporting Evidence:
PMID:19807924
screened a human SH3 domain phage display library
GO:0005515 protein binding
IPI
PMID:19807924
Identification of SH3 domain interaction partners of human F...
REMOVE
Summary: This row comes from a phage-display survey of SH3 domains against the FasL cytoplasmic region.
Reason: The screen identifies candidate SH3-mediated interactions but the generic protein-binding term is uninformative and the row does not establish a distinct FASLG molecular function.
Supporting Evidence:
PMID:19807924
screened a human SH3 domain phage display library
GO:0005515 protein binding
IPI
PMID:21803845
PMLRARΞ± binds to Fas and suppresses Fas-mediated apoptosis t...
UNDECIDED
Summary: The cached PMID:21803845 abstract supports PMLRARalpha/FAS/c-FLIP complexes but does not verify a direct FASLG:FAS experiment.
Reason: Because the paper is abstract-only locally and appears focused on FAS inhibition in acute promyelocytic leukemia, this exact imported PPI needs a full-text check.
GO:0005515 protein binding
IPI
PMID:24025841
A type III effector antagonizes death receptor signalling du...
MODIFY
Summary: The cited FASLG stimulation experiment supports the FASLG:FAS death-ligand interaction rather than a direct FASLG association with cytosolic DISC proteins.
Reason: These generic PPI imports are being narrowed to the direct receptor-binding activity that FASLG contributes upstream of FADD and CASP8 recruitment.
Proposed replacements: death receptor binding
Supporting Evidence:
PMID:7826947
induces apoptosis by binding to its receptor, Fas
GO:0005515 protein binding
IPI
PMID:24025841
A type III effector antagonizes death receptor signalling du...
MODIFY
Summary: The cited FASLG stimulation experiment supports the FASLG:FAS death-ligand interaction rather than a direct FASLG association with cytosolic DISC proteins.
Reason: These generic PPI imports are being narrowed to the direct receptor-binding activity that FASLG contributes upstream of FADD and CASP8 recruitment.
Proposed replacements: death receptor binding
Supporting Evidence:
PMID:7826947
induces apoptosis by binding to its receptor, Fas
GO:0005515 protein binding
IPI
PMID:25241761
Using an in situ proximity ligation assay to systematically ...
REMOVE
Summary: This endogenous HeLa interaction row comes from a broad proximity-ligation survey.
Reason: The PLA screen does not convert FASLG proximity to FAS, FADD, FYN, or PIK3R1 into a curated FASLG molecular function.
Supporting Evidence:
PMID:25241761
investigate 1204 endogenous PPIs in HeLa cells
GO:0005515 protein binding
IPI
PMID:25241761
Using an in situ proximity ligation assay to systematically ...
REMOVE
Summary: This endogenous HeLa interaction row comes from a broad proximity-ligation survey.
Reason: The PLA screen does not convert FASLG proximity to FAS, FADD, FYN, or PIK3R1 into a curated FASLG molecular function.
Supporting Evidence:
PMID:25241761
investigate 1204 endogenous PPIs in HeLa cells
GO:0005515 protein binding
IPI
PMID:25241761
Using an in situ proximity ligation assay to systematically ...
REMOVE
Summary: This endogenous HeLa interaction row comes from a broad proximity-ligation survey.
Reason: The PLA screen does not convert FASLG proximity to FAS, FADD, FYN, or PIK3R1 into a curated FASLG molecular function.
Supporting Evidence:
PMID:25241761
investigate 1204 endogenous PPIs in HeLa cells
GO:0005515 protein binding
IPI
PMID:25241761
Using an in situ proximity ligation assay to systematically ...
REMOVE
Summary: This endogenous HeLa interaction row comes from a broad proximity-ligation survey.
Reason: The PLA screen does not convert FASLG proximity to FAS, FADD, FYN, or PIK3R1 into a curated FASLG molecular function.
Supporting Evidence:
PMID:25241761
investigate 1204 endogenous PPIs in HeLa cells
GO:0005515 protein binding
IPI
PMID:25416956
A proteome-scale map of the human interactome network.
REMOVE
Summary: This row is a proteome-scale human interactome import.
Reason: Large binary interactome edges to RGS20, TRIP6, KRT40, or NOTCH2NLA are not evidence for FASLG death-receptor binding or a curated FasL-tail activity.
Supporting Evidence:
PMID:25416956
proteome-scale map of the human interactome
GO:0005515 protein binding
IPI
PMID:25416956
A proteome-scale map of the human interactome network.
REMOVE
Summary: This row is a proteome-scale human interactome import.
Reason: Large binary interactome edges to RGS20, TRIP6, KRT40, or NOTCH2NLA are not evidence for FASLG death-receptor binding or a curated FasL-tail activity.
Supporting Evidence:
PMID:25416956
proteome-scale map of the human interactome
GO:0005515 protein binding
IPI
PMID:25416956
A proteome-scale map of the human interactome network.
REMOVE
Summary: This row is a proteome-scale human interactome import.
Reason: Large binary interactome edges to RGS20, TRIP6, KRT40, or NOTCH2NLA are not evidence for FASLG death-receptor binding or a curated FasL-tail activity.
Supporting Evidence:
PMID:25416956
proteome-scale map of the human interactome
GO:0005515 protein binding
IPI
PMID:25416956
A proteome-scale map of the human interactome network.
REMOVE
Summary: This row is a proteome-scale human interactome import.
Reason: Large binary interactome edges to RGS20, TRIP6, KRT40, or NOTCH2NLA are not evidence for FASLG death-receptor binding or a curated FasL-tail activity.
Supporting Evidence:
PMID:25416956
proteome-scale map of the human interactome
GO:0005515 protein binding
IPI
PMID:25416956
A proteome-scale map of the human interactome network.
REMOVE
Summary: This row is a proteome-scale human interactome import.
Reason: Large binary interactome edges to RGS20, TRIP6, KRT40, or NOTCH2NLA are not evidence for FASLG death-receptor binding or a curated FasL-tail activity.
Supporting Evidence:
PMID:25416956
proteome-scale map of the human interactome
GO:0005515 protein binding
IPI
PMID:25890358
TNFΞ± sensitizes neuroblastoma cells to FasL-, cisplatin- and...
MODIFY
Summary: The cited FASLG stimulation experiment supports the FASLG:FAS death-ligand interaction rather than a direct FASLG association with cytosolic DISC proteins.
Reason: These generic PPI imports are being narrowed to the direct receptor-binding activity that FASLG contributes upstream of FADD and CASP8 recruitment.
Proposed replacements: death receptor binding
Supporting Evidence:
PMID:7826947
induces apoptosis by binding to its receptor, Fas
GO:0005515 protein binding
IPI
PMID:25890358
TNFΞ± sensitizes neuroblastoma cells to FasL-, cisplatin- and...
MODIFY
Summary: The cited FASLG stimulation experiment supports the FASLG:FAS death-ligand interaction rather than a direct FASLG association with cytosolic DISC proteins.
Reason: These generic PPI imports are being narrowed to the direct receptor-binding activity that FASLG contributes upstream of FADD and CASP8 recruitment.
Proposed replacements: death receptor binding
Supporting Evidence:
PMID:7826947
induces apoptosis by binding to its receptor, Fas
GO:0005515 protein binding
IPI
PMID:26871637
Widespread Expansion of Protein Interaction Capabilities by ...
REMOVE
Summary: The NCK1 row comes from an alternative-splicing interactome screen rather than focused FASLG biology.
Reason: This high-throughput interaction is not an informative FASLG molecular function.
Supporting Evidence:
PMID:26871637
binary protein-protein interactions
GO:0005515 protein binding
IPI
PMID:28514442
Architecture of the human interactome defines protein commun...
REMOVE
Summary: The SNX33 row comes from BioPlex AP-MS co-complex mapping.
Reason: A proteome-scale AP-MS edge in HEK293T cells does not establish a physiologic FASLG activity.
Supporting Evidence:
PMID:28514442
BioPlex 2.0
GO:0005515 protein binding
IPI
PMID:32296183
A reference map of the human binary protein interactome.
REMOVE
Summary: This row is a HuRI yeast-two-hybrid interactome import.
Reason: These binary interactome hits do not establish an apoptosis-specific or trafficking-specific FASLG activity and should not remain as generic protein binding.
Supporting Evidence:
PMID:32296183
reference map of the human binary protein interactome
GO:0005515 protein binding
IPI
PMID:32296183
A reference map of the human binary protein interactome.
REMOVE
Summary: This row is a HuRI yeast-two-hybrid interactome import.
Reason: These binary interactome hits do not establish an apoptosis-specific or trafficking-specific FASLG activity and should not remain as generic protein binding.
Supporting Evidence:
PMID:32296183
reference map of the human binary protein interactome
GO:0005515 protein binding
IPI
PMID:32296183
A reference map of the human binary protein interactome.
REMOVE
Summary: This row is a HuRI yeast-two-hybrid interactome import.
Reason: These binary interactome hits do not establish an apoptosis-specific or trafficking-specific FASLG activity and should not remain as generic protein binding.
Supporting Evidence:
PMID:32296183
reference map of the human binary protein interactome
GO:0005515 protein binding
IPI
PMID:32296183
A reference map of the human binary protein interactome.
REMOVE
Summary: This row is a HuRI yeast-two-hybrid interactome import.
Reason: These binary interactome hits do not establish an apoptosis-specific or trafficking-specific FASLG activity and should not remain as generic protein binding.
Supporting Evidence:
PMID:32296183
reference map of the human binary protein interactome
GO:0005515 protein binding
IPI
PMID:32296183
A reference map of the human binary protein interactome.
REMOVE
Summary: This row is a HuRI yeast-two-hybrid interactome import.
Reason: These binary interactome hits do not establish an apoptosis-specific or trafficking-specific FASLG activity and should not remain as generic protein binding.
Supporting Evidence:
PMID:32296183
reference map of the human binary protein interactome
GO:0005515 protein binding
IPI
PMID:32296183
A reference map of the human binary protein interactome.
REMOVE
Summary: This row is a HuRI yeast-two-hybrid interactome import.
Reason: These binary interactome hits do not establish an apoptosis-specific or trafficking-specific FASLG activity and should not remain as generic protein binding.
Supporting Evidence:
PMID:32296183
reference map of the human binary protein interactome
GO:0005515 protein binding
IPI
PMID:32296183
A reference map of the human binary protein interactome.
REMOVE
Summary: This row is a HuRI yeast-two-hybrid interactome import.
Reason: These binary interactome hits do not establish an apoptosis-specific or trafficking-specific FASLG activity and should not remain as generic protein binding.
Supporting Evidence:
PMID:32296183
reference map of the human binary protein interactome
GO:0005515 protein binding
IPI
PMID:32296183
A reference map of the human binary protein interactome.
REMOVE
Summary: This row is a HuRI yeast-two-hybrid interactome import.
Reason: These binary interactome hits do not establish an apoptosis-specific or trafficking-specific FASLG activity and should not remain as generic protein binding.
Supporting Evidence:
PMID:32296183
reference map of the human binary protein interactome
GO:0005515 protein binding
IPI
PMID:32296183
A reference map of the human binary protein interactome.
REMOVE
Summary: This row is a HuRI yeast-two-hybrid interactome import.
Reason: These binary interactome hits do not establish an apoptosis-specific or trafficking-specific FASLG activity and should not remain as generic protein binding.
Supporting Evidence:
PMID:32296183
reference map of the human binary protein interactome
GO:0005515 protein binding
IPI
PMID:32296183
A reference map of the human binary protein interactome.
REMOVE
Summary: This row is a HuRI yeast-two-hybrid interactome import.
Reason: These binary interactome hits do not establish an apoptosis-specific or trafficking-specific FASLG activity and should not remain as generic protein binding.
Supporting Evidence:
PMID:32296183
reference map of the human binary protein interactome
GO:0005515 protein binding
IPI
PMID:33961781
Dual proteome-scale networks reveal cell-specific remodeling...
REMOVE
Summary: The SNX33 row comes from BioPlex 3.0 AP-MS co-complex mapping.
Reason: A proteome-scale AP-MS edge does not establish a curated FASLG molecular function.
Supporting Evidence:
PMID:33961781
BioPlex 3.0
GO:0005515 protein binding
IPI
PMID:35922511
A physical wiring diagram for the human immune system.
MODIFY
Summary: The cited FASLG stimulation experiment supports the FASLG:FAS death-ligand interaction rather than a direct FASLG association with cytosolic DISC proteins.
Reason: These generic PPI imports are being narrowed to the direct receptor-binding activity that FASLG contributes upstream of FADD and CASP8 recruitment.
Proposed replacements: death receptor binding
Supporting Evidence:
PMID:7826947
induces apoptosis by binding to its receptor, Fas
GO:0005515 protein binding
IPI
PMID:40205054
Multimodal cell maps as a foundation for structural and func...
REMOVE
Summary: This row comes from the 2025 U2OS multimodal cell-map AP-MS and imaging resource.
Reason: The SNX9/SNX33 cell-map edges are proteome-scale context data and do not justify generic protein-binding annotations on FASLG.
Supporting Evidence:
PMID:40205054
more than 5,100 proteins in U2OS cells
GO:0005515 protein binding
IPI
PMID:40205054
Multimodal cell maps as a foundation for structural and func...
REMOVE
Summary: This row comes from the 2025 U2OS multimodal cell-map AP-MS and imaging resource.
Reason: The SNX9/SNX33 cell-map edges are proteome-scale context data and do not justify generic protein-binding annotations on FASLG.
Supporting Evidence:
PMID:40205054
more than 5,100 proteins in U2OS cells
GO:0005576 extracellular region
IBA
GO_REF:0000033
ACCEPT
Summary: FASLG has an extracellular receptor-binding ectodomain and can be released as soluble FasL.
Reason: The extracellular-region annotation is correct for the TNF-homology domain that binds FAS and for the soluble receptor-binding ectodomain.
Supporting Evidence:
PMID:9228058
sFasL, containing the extracellular portion
GO:0005576 extracellular region
IDA
PMID:18835034
Plasminogen activator inhibitor-1 protects endothelial cells...
ACCEPT
Summary: FASLG has an extracellular receptor-binding ectodomain and can be released as soluble FasL.
Reason: The extracellular-region annotation is correct for the TNF-homology domain that binds FAS and for the soluble receptor-binding ectodomain.
Supporting Evidence:
PMID:9228058
sFasL, containing the extracellular portion
GO:0005576 extracellular region
IDA
PMID:9228058
Characterization of Fas (Apo-1, CD95)-Fas ligand interaction...
ACCEPT
Summary: FASLG has an extracellular receptor-binding ectodomain and can be released as soluble FasL.
Reason: The extracellular-region annotation is correct for the TNF-homology domain that binds FAS and for the soluble receptor-binding ectodomain.
Supporting Evidence:
PMID:9228058
sFasL, containing the extracellular portion
GO:0005576 extracellular region
IEA
GO_REF:0000044
ACCEPT
Summary: FASLG has an extracellular receptor-binding ectodomain and can be released as soluble FasL.
Reason: The extracellular-region annotation is correct for the TNF-homology domain that binds FAS and for the soluble receptor-binding ectodomain.
Supporting Evidence:
PMID:9228058
sFasL, containing the extracellular portion
GO:0005576 extracellular region
TAS
Reactome:R-HSA-139952
ACCEPT
Summary: True: entailed by extracellular exosome, kept in this review.
Reason: The claim is true: extracellular exosome, kept in this review, entails this term. Other rows for this term are ACCEPTed. This row's reference does not establish it; that is recorded in source_defects, not grounds for REMOVE, which judges the claim.
Supporting Evidence:
PMID:9228058
sFasL, containing the extracellular portion
GO:0005576 extracellular region
TAS
Reactome:R-HSA-141310
ACCEPT
Summary: This Reactome event explicitly keeps FASLG in the extracellular FAS/CD95 receptor platform.
Reason: FASLG remains the extracellular ligand in the FAS receptor trimer and proximal FADD/procaspase recruitment events.
Supporting Evidence:
Reactome:R-HSA-83586
FASL:FAS receptor trimer
GO:0005576 extracellular region
TAS
Reactome:R-HSA-3465429
ACCEPT
Summary: True: entailed by extracellular exosome, kept in this review.
Reason: The claim is true: extracellular exosome, kept in this review, entails this term. Other rows for this term are ACCEPTed. This row's reference does not establish it; that is recorded in source_defects, not grounds for REMOVE, which judges the claim.
Supporting Evidence:
PMID:9228058
sFasL, containing the extracellular portion
GO:0005576 extracellular region
TAS
Reactome:R-HSA-3465448
ACCEPT
Summary: True: entailed by extracellular exosome, kept in this review.
Reason: The claim is true: extracellular exosome, kept in this review, entails this term. Other rows for this term are ACCEPTed. This row's reference does not establish it; that is recorded in source_defects, not grounds for REMOVE, which judges the claim.
Supporting Evidence:
PMID:9228058
sFasL, containing the extracellular portion
GO:0005576 extracellular region
TAS
Reactome:R-HSA-3465459
ACCEPT
Summary: This Reactome event explicitly keeps FASLG in the extracellular FAS/CD95 receptor platform.
Reason: FASLG remains the extracellular ligand in the FAS receptor trimer and proximal FADD/procaspase recruitment events.
Supporting Evidence:
Reactome:R-HSA-83586
FASL:FAS receptor trimer
GO:0005576 extracellular region
TAS
Reactome:R-HSA-5675456
ACCEPT
Summary: True: entailed by extracellular exosome, kept in this review.
Reason: The claim is true: extracellular exosome, kept in this review, entails this term. Other rows for this term are ACCEPTed. This row's reference does not establish it; that is recorded in source_defects, not grounds for REMOVE, which judges the claim.
Supporting Evidence:
PMID:9228058
sFasL, containing the extracellular portion
GO:0005576 extracellular region
TAS
Reactome:R-HSA-6797245
ACCEPT
Summary: True: entailed by extracellular exosome, kept in this review.
Reason: The claim is true: extracellular exosome, kept in this review, entails this term. Other rows for this term are ACCEPTed. This row's reference does not establish it; that is recorded in source_defects, not grounds for REMOVE, which judges the claim.
Supporting Evidence:
PMID:9228058
sFasL, containing the extracellular portion
GO:0005576 extracellular region
TAS
Reactome:R-HSA-71050
ACCEPT
Summary: This Reactome event explicitly keeps FASLG in the extracellular FAS/CD95 receptor platform.
Reason: FASLG remains the extracellular ligand in the FAS receptor trimer and proximal FADD/procaspase recruitment events.
Supporting Evidence:
Reactome:R-HSA-83586
FASL:FAS receptor trimer
GO:0005576 extracellular region
TAS
Reactome:R-HSA-73945
ACCEPT
Summary: This Reactome event explicitly keeps FASLG in the extracellular FAS/CD95 receptor platform.
Reason: FASLG remains the extracellular ligand in the FAS receptor trimer and proximal FADD/procaspase recruitment events.
Supporting Evidence:
Reactome:R-HSA-83586
FASL:FAS receptor trimer
GO:0005576 extracellular region
TAS
Reactome:R-HSA-75244
ACCEPT
Summary: This Reactome event explicitly keeps FASLG in the extracellular FAS/CD95 receptor platform.
Reason: FASLG remains the extracellular ligand in the FAS receptor trimer and proximal FADD/procaspase recruitment events.
Supporting Evidence:
Reactome:R-HSA-83586
FASL:FAS receptor trimer
GO:0005576 extracellular region
TAS
Reactome:R-HSA-83586
ACCEPT
Summary: This Reactome event explicitly keeps FASLG in the extracellular FAS/CD95 receptor platform.
Reason: FASLG remains the extracellular ligand in the FAS receptor trimer and proximal FADD/procaspase recruitment events.
Supporting Evidence:
Reactome:R-HSA-83586
FASL:FAS receptor trimer
GO:0005576 extracellular region
TAS
Reactome:R-HSA-83650
ACCEPT
Summary: This Reactome event explicitly keeps FASLG in the extracellular FAS/CD95 receptor platform.
Reason: FASLG remains the extracellular ligand in the FAS receptor trimer and proximal FADD/procaspase recruitment events.
Supporting Evidence:
Reactome:R-HSA-83586
FASL:FAS receptor trimer
GO:0005576 extracellular region
TAS
Reactome:R-HSA-8870698
ACCEPT
Summary: True: entailed by extracellular exosome, kept in this review.
Reason: The claim is true: extracellular exosome, kept in this review, entails this term. Other rows for this term are ACCEPTed. This row's reference does not establish it; that is recorded in source_defects, not grounds for REMOVE, which judges the claim.
Supporting Evidence:
PMID:9228058
sFasL, containing the extracellular portion
GO:0005576 extracellular region
TAS
Reactome:R-HSA-9614669
ACCEPT
Summary: True: entailed by extracellular exosome, kept in this review.
Reason: The claim is true: extracellular exosome, kept in this review, entails this term. Other rows for this term are ACCEPTed. This row's reference does not establish it; that is recorded in source_defects, not grounds for REMOVE, which judges the claim.
Supporting Evidence:
PMID:9228058
sFasL, containing the extracellular portion
GO:0005634 nucleus
IDA
PMID:17557115
The Fas ligand intracellular domain is released by ADAM10 an...
KEEP AS NON CORE
Summary: The processed FasL intracellular domain translocates to the nucleus.
Reason: Nuclear localization is valid for the SPPL2A-released ICD but is not the main extracellular ligand location of FASLG.
Supporting Evidence:
PMID:17557115
the nucleus and is capable of inhibiting gene transcription
GO:0005634 nucleus
IEA
GO_REF:0000044
KEEP AS NON CORE
Summary: The processed FasL intracellular domain translocates to the nucleus.
Reason: Nuclear localization is valid for the SPPL2A-released ICD but is not the main extracellular ligand location of FASLG.
Supporting Evidence:
PMID:17557115
the nucleus and is capable of inhibiting gene transcription
GO:0005737 cytoplasm
IEA
GO_REF:0000107
KEEP AS NON CORE
Summary: FASLG has an N-terminal cytoplasmic tail that can be liberated as the FasL ICD.
Reason: The cytoplasmic annotation is plausible for the membrane precursor and ICD, but it is ancillary to the extracellular TNF ligand function.
GO:0005886 plasma membrane
IDA
PMID:12201652
Mechanisms of nonspecific cytotoxic cell regulation of apopt...
ACCEPT
Summary: True: entailed by external side of plasma membrane, kept in this review.
Reason: The claim is true: external side of plasma membrane, kept in this review, entails this term. Other rows for this term are ACCEPTed. This row's reference does not establish it; that is recorded in source_defects, not grounds for REMOVE, which judges the claim.
Supporting Evidence:
PMID:7826947
FasL is a type II membrane protein
GO:0005886 plasma membrane
IEA
GO_REF:0000120
ACCEPT
Summary: Full-length FASLG is a type II plasma-membrane protein.
Reason: The membrane precursor places the receptor-binding TNF-homology domain outside the cell for FAS engagement.
Supporting Evidence:
PMID:7826947
FasL is a type II membrane protein
GO:0005886 plasma membrane
TAS
PMID:7826947
Human Fas ligand: gene structure, chromosomal location and s...
ACCEPT
Summary: Full-length FASLG is a type II plasma-membrane protein.
Reason: The membrane precursor places the receptor-binding TNF-homology domain outside the cell for FAS engagement.
Supporting Evidence:
PMID:7826947
FasL is a type II membrane protein
GO:0005901 caveola
IEA
GO_REF:0000107
MARK AS OVER ANNOTATED
Summary: Caveola is too specific for the well-supported human FASLG membrane/secretory-lysosome route.
Reason: This orthology-transferred location should not be treated as a core human FASLG localization without direct human evidence.
GO:0006915 apoptotic process
IEA
GO_REF:0000002
MODIFY
Summary: The source supports FAS death-receptor apoptosis more specifically than this broad signaling or apoptosis term.
Reason: Replace the generic process with the death-domain-receptor extrinsic apoptotic signaling pathway initiated by FASLG:FAS binding.
Supporting Evidence:
PMID:7826947
induces apoptosis by binding to its receptor, Fas
GO:0006915 apoptotic process
TAS
PMID:8787672
Fas ligand mutation in a patient with systemic lupus erythem...
MODIFY
Summary: The source supports FAS death-receptor apoptosis more specifically than this broad signaling or apoptosis term.
Reason: Replace the generic process with the death-domain-receptor extrinsic apoptotic signaling pathway initiated by FASLG:FAS binding.
Supporting Evidence:
PMID:7826947
induces apoptosis by binding to its receptor, Fas
GO:0006925 inflammatory cell apoptotic process
IEA
GO_REF:0000107
KEEP AS NON CORE
Summary: FASLG-dependent FAS signaling can eliminate activated immune and inflammatory cells.
Reason: This transferred immune-cell apoptosis context is plausible but is a cell-type outcome of the core FASLG death-receptor ligand activity.
GO:0006955 immune response
IEA
GO_REF:0000002
MARK AS OVER ANNOTATED
Summary: Generic immune response is too broad for an InterPro TNF-family mapping.
Reason: FASLG participates in immune homeostasis through FAS-dependent cell death, but this parent process hides the direct death-receptor mechanism.
GO:0007165 signal transduction
TAS
PMID:7826947
Human Fas ligand: gene structure, chromosomal location and s...
MODIFY
Summary: The source supports FAS death-receptor apoptosis more specifically than this broad signaling or apoptosis term.
Reason: Replace the generic process with the death-domain-receptor extrinsic apoptotic signaling pathway initiated by FASLG:FAS binding.
Supporting Evidence:
PMID:7826947
induces apoptosis by binding to its receptor, Fas
GO:0007267 cell-cell signaling
TAS
PMID:7826947
Human Fas ligand: gene structure, chromosomal location and s...
MODIFY
Summary: The source supports FAS death-receptor apoptosis more specifically than this broad signaling or apoptosis term.
Reason: Replace the generic process with the death-domain-receptor extrinsic apoptotic signaling pathway initiated by FASLG:FAS binding.
Supporting Evidence:
PMID:7826947
induces apoptosis by binding to its receptor, Fas
GO:0008284 positive regulation of cell population proliferation
IEA
GO_REF:0000107
MARK AS OVER ANNOTATED
Summary: Positive regulation of proliferation is a noncanonical transferred outcome for FASLG.
Reason: FASLG can trigger non-apoptotic FAS outputs in some contexts, but this broad growth row should not be used as a core apoptosis annotation.
GO:0008625 extrinsic apoptotic signaling pathway via death domain receptors
IBA
GO_REF:0000033
ACCEPT
Summary: FASLG initiates extrinsic apoptotic signaling through the FAS/CD95 death receptor.
Reason: This is the canonical biological process for membrane FASLG and is the process used in the curated FASL-FAS GO-CAM.
Supporting Evidence:
PMID:26582200
Fas ligand (FasL)-induced apoptosis
GO:0008625 extrinsic apoptotic signaling pathway via death domain receptors
IDA
PMID:18835034
Plasminogen activator inhibitor-1 protects endothelial cells...
ACCEPT
Summary: FASLG initiates extrinsic apoptotic signaling through the FAS/CD95 death receptor.
Reason: This is the canonical biological process for membrane FASLG and is the process used in the curated FASL-FAS GO-CAM.
Supporting Evidence:
PMID:26582200
Fas ligand (FasL)-induced apoptosis
GO:0008625 extrinsic apoptotic signaling pathway via death domain receptors
IDA
PMID:26582200
Lifeguard Inhibits Fas Ligand-mediated Endoplasmic Reticulum...
ACCEPT
Summary: FASLG initiates extrinsic apoptotic signaling through the FAS/CD95 death receptor.
Reason: This is the canonical biological process for membrane FASLG and is the process used in the curated FASL-FAS GO-CAM.
Supporting Evidence:
PMID:26582200
Fas ligand (FasL)-induced apoptosis
GO:0008625 extrinsic apoptotic signaling pathway via death domain receptors
IEA
GO_REF:0000120
ACCEPT
Summary: FASLG initiates extrinsic apoptotic signaling through the FAS/CD95 death receptor.
Reason: This is the canonical biological process for membrane FASLG and is the process used in the curated FASL-FAS GO-CAM.
Supporting Evidence:
PMID:26582200
Fas ligand (FasL)-induced apoptosis
GO:0009897 external side of plasma membrane
IEA
GO_REF:0000107
ACCEPT
Summary: The full-length type II FASLG precursor is displayed at the external face of the cell membrane.
Reason: These membrane/cell-surface terms are correct, although less mechanistically informative than the FASLG cytokine activity.
Supporting Evidence:
PMID:7826947
FasL is a type II membrane protein
GO:0009986 cell surface
IEA
GO_REF:0000107
ACCEPT
Summary: The full-length type II FASLG precursor is displayed at the external face of the cell membrane.
Reason: These membrane/cell-surface terms are correct, although less mechanistically informative than the FASLG cytokine activity.
Supporting Evidence:
PMID:7826947
FasL is a type II membrane protein
GO:0016020 membrane
IEA
GO_REF:0000002
ACCEPT
Summary: The full-length type II FASLG precursor is displayed at the external face of the cell membrane.
Reason: These membrane/cell-surface terms are correct, although less mechanistically informative than the FASLG cytokine activity.
Supporting Evidence:
PMID:7826947
FasL is a type II membrane protein
GO:0016525 negative regulation of angiogenesis
IDA
PMID:18835034
Plasminogen activator inhibitor-1 protects endothelial cells...
MARK AS OVER ANNOTATED
Summary: FASLG can reduce angiogenesis indirectly by inducing endothelial-cell FAS apoptosis.
Reason: The anti-angiogenesis phenotype is downstream of soluble FasL-mediated endothelial apoptosis and should not be centered as a direct FASLG pathway step.
Supporting Evidence:
PMID:18835034
plasmin cleaves FasL at Arg144-Lys145
GO:0030644 intracellular chloride ion homeostasis
IEA
GO_REF:0000107
MARK AS OVER ANNOTATED
Summary: This transferred context is not a direct human FASLG apoptosis step.
Reason: The row likely reflects a specific rat or contextual phenotype and overextends FASLG beyond death-receptor ligand biology.
GO:0032496 response to lipopolysaccharide
IEA
GO_REF:0000107
MARK AS OVER ANNOTATED
Summary: This transferred context is not a direct human FASLG apoptosis step.
Reason: The row likely reflects a specific rat or contextual phenotype and overextends FASLG beyond death-receptor ligand biology.
GO:0043065 positive regulation of apoptotic process
IDA
PMID:14749367
Regulation of apoptosis by the Ft1 protein, a new modulator ...
MODIFY
Summary: The Ft1/PKB/GSK3/NF-ATc pathway controls production of FasL, whose death output is FAS-dependent extrinsic apoptosis.
Reason: If this expression-mediated row is retained on FASLG, it should be narrowed from generic positive regulation of apoptosis to the FAS death-receptor pathway executed by the FasL protein.
Supporting Evidence:
PMID:14749367
controls the production of the proapoptotic hormone Fas ligand
GO:0043065 positive regulation of apoptotic process
IDA
PMID:21625644
Modulation of the CD95-induced apoptosis: the role of CD95 N...
MODIFY
Summary: The source supports FAS death-receptor apoptosis more specifically than this broad signaling or apoptosis term.
Reason: Replace the generic process with the death-domain-receptor extrinsic apoptotic signaling pathway initiated by FASLG:FAS binding.
Supporting Evidence:
PMID:7826947
induces apoptosis by binding to its receptor, Fas
GO:0043123 positive regulation of canonical NF-kappaB signal transduction
IBA
GO_REF:0000033
KEEP AS NON CORE
Summary: FASLG can contribute to non-apoptotic FAS-dependent NF-kappaB signaling in some contexts.
Reason: NF-kappaB activation is not the core FASLG output, but FAS signaling can activate non-apoptotic transcriptional pathways, especially when the soluble ligand form or overexpression is used.
GO:0043123 positive regulation of canonical NF-kappaB signal transduction
IEP
PMID:12761501
Large-scale identification and characterization of human gen...
KEEP AS NON CORE
Summary: FASLG can contribute to non-apoptotic FAS-dependent NF-kappaB signaling in some contexts.
Reason: NF-kappaB activation is not the core FASLG output, but FAS signaling can activate non-apoptotic transcriptional pathways, especially when the soluble ligand form or overexpression is used.
GO:0043202 lysosomal lumen
IEA
GO_REF:0000044
ACCEPT
Summary: FASLG traffics through secretory lysosomes before regulated surface delivery.
Reason: The lysosomal-lumen mapping captures storage of the FASLG ectodomain in FasL-positive secretory lysosomes.
GO:0043525 positive regulation of neuron apoptotic process
IEA
GO_REF:0000107
MARK AS OVER ANNOTATED
Summary: This transferred context is not a direct human FASLG apoptosis step.
Reason: The row likely reflects a specific rat or contextual phenotype and overextends FASLG beyond death-receptor ligand biology.
GO:0045742 positive regulation of epidermal growth factor receptor signaling pathway
IEA
GO_REF:0000107
MARK AS OVER ANNOTATED
Summary: This transferred context is not a direct human FASLG apoptosis step.
Reason: The row likely reflects a specific rat or contextual phenotype and overextends FASLG beyond death-receptor ligand biology.
GO:0048388 endosomal lumen acidification
IEA
GO_REF:0000107
REMOVE
Summary: Endosomal lumen acidification is not a FASLG activity or localization.
Reason: This orthology-transferred row is too indirect and should not be retained for human FASLG.
GO:0048471 perinuclear region of cytoplasm
IEA
GO_REF:0000107
MARK AS OVER ANNOTATED
Summary: This transferred context is not a direct human FASLG apoptosis step.
Reason: The row likely reflects a specific rat or contextual phenotype and overextends FASLG beyond death-receptor ligand biology.
GO:0060205 cytoplasmic vesicle lumen
IEA
GO_REF:0000044
ACCEPT
Summary: FASLG is stored in cytoplasmic vesicles/secretory lysosomes before cell-surface presentation.
Reason: The cytoplasmic vesicle lumen is a valid route for regulated FASLG trafficking in cytotoxic lymphocytes.
GO:0070062 extracellular exosome
IDA
PMID:17076679
Specific isolation of placenta-derived exosomes from the cir...
KEEP AS NON CORE
Summary: FASLG can be packaged in secreted exosome-like vesicles.
Reason: Extracellular vesicle FASLG is a supported but contextual extracellular delivery route rather than the core membrane FASLG:FAS platform.
Supporting Evidence:
PMID:22891283
Activated T cells secrete Fas ligand (FasL)-containing vesicles
GO:0070231 T cell apoptotic process
IDA
PMID:17076679
Specific isolation of placenta-derived exosomes from the cir...
KEEP AS NON CORE
Summary: Placental exosomal FasL contributes to T-cell suppression and lymphocyte apoptosis.
Reason: FASLG can kill T cells in specialized exosome-mediated immune-regulatory contexts, but this is a cell-type instance of FAS death-receptor signaling.
Supporting Evidence:
PMID:17076679
exosomal FasL is an important contributor
GO:0070266 necroptotic process
IDA
PMID:11101870
Fas triggers an alternative, caspase-8-independent cell deat...
KEEP AS NON CORE
Summary: FAS stimulation can trigger RIPK-dependent caspase-independent necrotic death when caspases are blocked.
Reason: This is a noncanonical FASLG-dependent death branch, not the core CASP8 apoptotic pathway.
Supporting Evidence:
PMID:11101870
Fas ligand-induced caspase-independent death
GO:0070848 response to growth factor
IEA
GO_REF:0000107
MARK AS OVER ANNOTATED
Summary: This transferred context is not a direct human FASLG apoptosis step.
Reason: The row likely reflects a specific rat or contextual phenotype and overextends FASLG beyond death-receptor ligand biology.
GO:0071346 cellular response to type II interferon
IEA
GO_REF:0000107
MARK AS OVER ANNOTATED
Summary: This transferred context is not a direct human FASLG apoptosis step.
Reason: The row likely reflects a specific rat or contextual phenotype and overextends FASLG beyond death-receptor ligand biology.
GO:0097190 apoptotic signaling pathway
IDA
PMID:11101870
Fas triggers an alternative, caspase-8-independent cell deat...
MODIFY
Summary: PMID:11101870 is specifically about RIP-dependent non-apoptotic FAS death.
Reason: The better replacement is necroptotic signaling rather than apoptotic signaling because the paper tested FASLG-induced death in the absence of active caspases.
Proposed replacements: necroptotic signaling pathway
Supporting Evidence:
PMID:11101870
Fas ligand-induced caspase-independent death
GO:0097190 apoptotic signaling pathway
IMP
PMID:18293083
Peroxisome proliferator-activated receptor gamma activates f...
MODIFY
Summary: The source supports FAS death-receptor apoptosis more specifically than this broad signaling or apoptosis term.
Reason: Replace the generic process with the death-domain-receptor extrinsic apoptotic signaling pathway initiated by FASLG:FAS binding.
Supporting Evidence:
PMID:7826947
induces apoptosis by binding to its receptor, Fas
GO:0097191 extrinsic apoptotic signaling pathway
IDA
PMID:22891283
Vesicles released by activated T cells induce both Fas-media...
MODIFY
Summary: The source supports FAS death-receptor apoptosis more specifically than this broad signaling or apoptosis term.
Reason: Replace the generic process with the death-domain-receptor extrinsic apoptotic signaling pathway initiated by FASLG:FAS binding.
Supporting Evidence:
PMID:7826947
induces apoptosis by binding to its receptor, Fas
GO:0097527 necroptotic signaling pathway
IDA
PMID:11101870
Fas triggers an alternative, caspase-8-independent cell deat...
KEEP AS NON CORE
Summary: FAS stimulation can signal through a RIPK-dependent necroptotic branch when apoptotic caspase activity is absent.
Reason: Necroptotic signaling is a valid noncanonical FAS output but is not the core FASLG function.
Supporting Evidence:
PMID:11101870
Fas ligand-induced caspase-independent death
GO:1903514 release of sequestered calcium ion into cytosol by endoplasmic reticulum
IDA
PMID:26582200
Lifeguard Inhibits Fas Ligand-mediated Endoplasmic Reticulum...
MARK AS OVER ANNOTATED
Summary: ER calcium release is downstream type-II-cell signaling after FasL stimulation.
Reason: FASLG is the extracellular death ligand in PMID:26582200, but it does not itself release sequestered ER calcium.
Supporting Evidence:
PMID:26582200
calcium mobilization after FasL stimulation
GO:1905782 positive regulation of phosphatidylserine exposure on apoptotic cell surface
IDA
PMID:24904167
Caspase-mediated cleavage of phospholipid flippase for apopt...
MARK AS OVER ANNOTATED
Summary: FASLG was used as an apoptosis stimulus in a flippase-cleavage study.
Reason: Phosphatidylserine exposure is executed downstream by caspase-mediated control of lipid flippase/scramblase machinery, not by FASLG directly.
GO:2000353 positive regulation of endothelial cell apoptotic process
IDA
PMID:18835034
Plasminogen activator inhibitor-1 protects endothelial cells...
KEEP AS NON CORE
Summary: FASLG-mediated FAS activation can induce endothelial-cell apoptosis.
Reason: This cell-type-specific process is supported in endothelial cells but should not replace the broader FAS death-receptor pathway as the FASLG core.
Supporting Evidence:
PMID:18835034
HBMEC expressed Fas and FasL under unstimulated conditions
GO:2001238 positive regulation of extrinsic apoptotic signaling pathway
IBA
GO_REF:0000033
ACCEPT
Summary: FASLG binding activates FAS and positively regulates the downstream extrinsic apoptotic pathway.
Reason: As an extracellular ligand, FASLG acts upstream of the FAS receptor and directly turns on death-receptor extrinsic apoptotic signaling.
Supporting Evidence:
PMID:7826947
induces apoptosis by binding to its receptor, Fas
GO:0036337 Fas signaling pathway
IDA
PMID:7826947
Human Fas ligand: gene structure, chromosomal location and s...
NEW
Summary: FASLG is the cognate TNF-family death ligand that initiates the Fas (CD95) signaling pathway by engaging trimeric FAS receptors at the plasma membrane.
Reason: FASLG directly performs the receptor-activating ligand step of the Fas signaling pathway (GO:0036337) by engaging and trimerizing cell-surface FAS/CD95 receptors through its extracellular TNF-homology domain to nucleate the FADD/CASP8 death-inducing signaling complex (PMID:7826947; PMID:9228058). Comparator death-receptor and cytokine ligands are annotated directly to their specific named receptor-signaling pathway terms (e.g. TNFSF10 on GO:0036462 TRAIL-activated apoptotic signaling pathway, IL34 on GO:0061514 interleukin-34-mediated signaling pathway, and C3 on GO:0002430 complement receptor mediated signaling pathway), and corroborating GO-CAM 663d668500001551 already places the downstream receptor and DISC components FAS (P25445), FADD (Q13158), and CASP8 (Q14790) in GO:0036337 while FASLG was annotated only to the broader parent GO:0008625 (extrinsic apoptotic signaling pathway via death domain receptors).
Supporting Evidence:
PMID:7826947
induces apoptosis by binding to its receptor, Fas
PMID:9228058
a molecular model of the FasL homotrimer bound to three Fas molecules

Core Functions

Pro-apoptotic TNF-family cytokine that acts in membrane-bound or shed soluble form to deliver an intercellular death signal to FAS-expressing target cells, initiating the Fas signaling pathway and FADD/CASP8-dependent extrinsic apoptosis.

Supporting Evidence:
  • PMID:7826947
    induces apoptosis by binding to its receptor, Fas
  • PMID:9333124
    both membrane-type and soluble form FasL from activated PBMCs induced apoptosis of these cells

Direct homotrimeric binding of the extracellular TNF-homology domain of FASLG to three FAS/CD95 death receptor monomers at the target-cell surface to nucleate assembly of the death-inducing signaling complex (DISC).

Supporting Evidence:
  • PMID:7826947
    induces apoptosis by binding to its receptor, Fas
  • PMID:9228058
    a molecular model of the FasL homotrimer bound to three Fas molecules
  • PMID:9333124
    Activated PBMCs expressed Fas ligand (FasL) strongly on their surface

References

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Suggested Questions for Experts

Q: Should Reactome-to-GOA export filter FASLG out of downstream CFLAR:CASP8 and FASLG transcription events so that extracellular-region annotations are sourced only to reactions that actually contain the FASLG protein?

Q: Should recurring IntAct imports of FASLG cytoplasmic-tail trafficking interactions remain uncurated at GO:0005515, or should GO add a FasL-tail adaptor-binding activity only if that activity can be defined more precisely than generic SH3/proline-rich binding?

Suggested Experiments

Experiment: For individual FASLG cytoplasmic-tail interactors from SH3, HuRI, BioPlex, and U2OS cell-map datasets, test endogenous binding in cytotoxic lymphocytes and quantify effects on secretory-lysosome storage, immunological-synapse delivery, FASLG shedding, and FAS-dependent target-cell apoptosis before making partner-specific GO annotations.

πŸ“š Additional Documentation

Notes

(FASLG-notes.md)

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