{"gene":"BFAR","run_date":"2026-04-28T17:12:38","timeline":{"discoveries":[{"year":2000,"finding":"BAR (BFAR/Bifunctional Apoptosis Regulator) was identified as an apoptosis regulator containing a SAM domain required for interactions with Bcl-2 and Bcl-XL and suppression of Bax-induced cell death, plus a DED-like domain responsible for interaction with DED-containing procaspases (procaspases-8 and -10) and suppression of Fas-induced apoptosis. BAR can bridge procaspase-8 and Bcl-2 into a protein complex, and is anchored in intracellular membranes where Bcl-2 resides.","method":"Yeast-based screen for inhibitors of Bax-induced cell death; Co-immunoprecipitation; domain mutagenesis; mammalian and yeast cell death assays","journal":"Proceedings of the National Academy of Sciences of the United States of America","confidence":"High","confidence_rationale":"Tier 1-2 — multiple orthogonal methods including yeast screen, Co-IP, domain deletion/mutagenesis, and functional cell death assays in both yeast and mammalian cells in a single foundational study","pmids":["10716992"],"is_preprint":false},{"year":2003,"finding":"BAR (BFAR) protein localizes predominantly to the endoplasmic reticulum (ER) in neuronal cells, as demonstrated by immunofluorescence microscopy. Overexpression of BAR in CSM 14.1 neuronal cells conferred significant protection from diverse cell death stimuli including mitochondrial pathway activators, TNF-family death receptor stimulation, and ER stress. Downregulation of BAR by antisense oligonucleotides sensitized neuronal cells to apoptosis. Novel interaction partners identified include HIP1, Hippi, and Bap31.","method":"Immunofluorescence microscopy; overexpression with cell viability assays; antisense oligonucleotide knockdown; co-immunoprecipitation/pulldown for interaction partners","journal":"Cell death and differentiation","confidence":"High","confidence_rationale":"Tier 2 — multiple orthogonal methods (localization, gain-of-function, loss-of-function, interaction studies) in a single study with defined phenotypic readouts","pmids":["14502241"],"is_preprint":false},{"year":2023,"finding":"BFAR is a direct interaction protein of bufalin (identified by human proteome microarray with 21,838 proteins) and promotes GC occurrence and metastasis by activating the PI3K/AKT/mTOR signaling pathway in vitro and in vivo. Bufalin inhibits GC by downregulating BFAR expression, reversing the pro-tumorigenic effect. Molecular docking predicted binding sites between bufalin and BFAR.","method":"Human proteome microarray; molecular docking; Western blotting; CCK-8 proliferation assay; scratch wound healing and transwell migration assays; in vivo tumor model; siRNA knockdown","journal":"Apoptosis : an international journal on programmed cell death","confidence":"Medium","confidence_rationale":"Tier 2-3 — proteome microarray identification plus functional validation in vitro and in vivo, but mechanistic detail of BFAR-PI3K/AKT/mTOR linkage is limited to expression/activity measurements without direct biochemical reconstitution","pmids":["37253905"],"is_preprint":false}],"current_model":"BFAR (Bifunctional Apoptosis Regulator) is an intracellular membrane-anchored scaffold protein (localized to the ER) that bridges the extrinsic and intrinsic apoptosis pathways via its DED-like domain (binding procaspase-8/-10 to suppress Fas-induced death) and its SAM domain (binding Bcl-2/Bcl-XL to suppress Bax-induced death), forming a procaspase-8/Bcl-2 complex; it is highly expressed in neurons and confers broad protection against apoptosis, while also activating the PI3K/AKT/mTOR pathway to promote cell survival and tumor progression."},"narrative":{"teleology":[{"year":2000,"claim":"The foundational question of how a single protein could suppress both extrinsic and intrinsic apoptosis was answered by the identification of BFAR as a bifunctional scaffold whose DED-like domain engages procaspases-8/-10 and whose SAM domain engages Bcl-2/Bcl-XL, physically bridging the two pathways.","evidence":"Yeast-based screen for Bax-death suppressors, co-immunoprecipitation, domain deletion/mutagenesis, and functional cell death assays in yeast and mammalian cells","pmids":["10716992"],"confidence":"High","gaps":["Subcellular localization in mammalian cells was inferred but not directly mapped by imaging","In vivo physiological relevance (knockout animal) not established","Structural basis of SAM–Bcl-2 and DED–procaspase interactions unresolved"]},{"year":2003,"claim":"The open question of where BFAR acts and whether it is physiologically relevant in a defined cell type was resolved by demonstrating ER localization in neurons, broad cytoprotection against mitochondrial, death-receptor, and ER-stress stimuli, and identification of additional partners (HIP1, Hippi, Bap31).","evidence":"Immunofluorescence microscopy, overexpression/cell viability assays, antisense oligonucleotide knockdown, co-immunoprecipitation/pulldown in neuronal CSM 14.1 cells","pmids":["14502241"],"confidence":"High","gaps":["Functional significance of HIP1, Hippi, and Bap31 interactions for BFAR's anti-apoptotic activity not dissected","No genetic loss-of-function model in vivo","Mechanism by which ER-localized BFAR protects against diverse death stimuli not delineated"]},{"year":2023,"claim":"Beyond apoptosis regulation, BFAR was linked to pro-tumorigenic signaling: it promotes gastric cancer cell proliferation and metastasis via PI3K/AKT/mTOR pathway activation, and is a direct target of the anti-cancer compound bufalin.","evidence":"Human proteome microarray, molecular docking, siRNA knockdown, proliferation/migration assays, and in vivo xenograft tumor model","pmids":["37253905"],"confidence":"Medium","gaps":["Direct biochemical mechanism linking BFAR to PI3K/AKT/mTOR activation not reconstituted","Whether the oncogenic role is dependent on or independent of BFAR's classical anti-apoptotic scaffold function is unknown","Bufalin–BFAR binding site validated only by molecular docking, not by mutagenesis or structural determination"]},{"year":null,"claim":"Key unresolved questions include the structural basis of BFAR's multi-domain interactions, the in vivo phenotype of BFAR loss-of-function, and the mechanism by which an ER-localized apoptosis scaffold activates PI3K/AKT/mTOR signaling.","evidence":"","pmids":[],"confidence":"High","gaps":["No crystal or cryo-EM structure of BFAR or its complexes","No knockout or conditional knockout animal model reported","Relationship between ER-localized anti-apoptotic function and PI3K/AKT/mTOR activation uncharacterized"]}],"mechanism_profile":{"molecular_activity":[{"term_id":"GO:0060090","term_label":"molecular adaptor activity","supporting_discovery_ids":[0,1]}],"localization":[{"term_id":"GO:0005783","term_label":"endoplasmic reticulum","supporting_discovery_ids":[1]}],"pathway":[{"term_id":"R-HSA-5357801","term_label":"Programmed Cell Death","supporting_discovery_ids":[0,1]},{"term_id":"R-HSA-162582","term_label":"Signal Transduction","supporting_discovery_ids":[2]}],"complexes":[],"partners":["BCL2","BCL2L1","CASP8","CASP10","HIP1","BAP31"],"other_free_text":[]},"mechanistic_narrative":"BFAR (Bifunctional Apoptosis Regulator) is an intracellular membrane-anchored scaffold protein that bridges the extrinsic and intrinsic apoptosis pathways: its DED-like domain binds procaspases-8 and -10 to suppress Fas-induced cell death, while its SAM domain interacts with Bcl-2 and Bcl-XL to suppress Bax-induced apoptosis, enabling formation of a procaspase-8/Bcl-2 complex [PMID:10716992]. BFAR localizes predominantly to the endoplasmic reticulum, is highly expressed in neurons, and confers broad cytoprotection against mitochondrial, death-receptor, and ER-stress-mediated apoptosis; its knockdown sensitizes neuronal cells to cell death [PMID:14502241]. BFAR also promotes gastric cancer cell proliferation and metastasis through activation of the PI3K/AKT/mTOR signaling pathway [PMID:37253905]."},"prefetch_data":{"uniprot":{"accession":"Q9NZS9","full_name":"Bifunctional apoptosis regulator","aliases":["RING finger protein 47"],"length_aa":450,"mass_kda":52.7,"function":"Membrane-bound E3 ubiquitin ligase that plays a role in several processes including apoptosis regulation or reticulum endoplasmic stress (PubMed:14502241, PubMed:21068390). Has anti-apoptotic activity, both for apoptosis triggered via death-receptors and via mitochondrial factors (PubMed:14502241). Contributes to the dynamic control of IRE1/ERN1 signaling during ER stress by inducing BAX inhibitor 1/TMBIM6 proteasomal degradation (PubMed:21068390). Promotes the activation of TGF-beta signaling by mediating the 'Lys-63'-linked ubiquitination of TGFBR1 which is critical to activate the pathway (PubMed:33914044). Together with NGFR, negatively regulates NF-kappa-B and JNK-related signaling pathways (PubMed:22566094). Promotes the proteasome-mediated degradation of PNPLA3, a protein involveld in lipid metabolism (PubMed:38294943)","subcellular_location":"Endoplasmic reticulum membrane","url":"https://www.uniprot.org/uniprotkb/Q9NZS9/entry"},"depmap":{"release":"DepMap","has_data":true,"is_common_essential":false,"resolved_as":"","url":"https://depmap.org/portal/gene/BFAR","classification":"Not Classified","n_dependent_lines":0,"n_total_lines":1208,"dependency_fraction":0.0},"opencell":{"profiled":false,"resolved_as":"","ensg_id":"","cell_line_id":"","localizations":[],"interactors":[],"url":"https://opencell.sf.czbiohub.org/search/BFAR","total_profiled":1310},"omim":[{"mim_id":"619516","title":"BIFUNCTIONAL APOPTOSIS REGULATOR; BFAR","url":"https://www.omim.org/entry/619516"},{"mim_id":"610562","title":"ZINC FINGER CCCH DOMAIN-CONTAINING PROTEIN 12A; ZC3H12A","url":"https://www.omim.org/entry/610562"},{"mim_id":"609157","title":"NODAL MODULATOR 1; NOMO1","url":"https://www.omim.org/entry/609157"}],"hpa":{"profiled":true,"resolved_as":"","reliability":"","locations":[],"tissue_specificity":"Low tissue specificity","tissue_distribution":"Detected in all","driving_tissues":[],"url":"https://www.proteinatlas.org/search/BFAR"},"hgnc":{"alias_symbol":["BAR","RNF47"],"prev_symbol":[]},"alphafold":{"accession":"Q9NZS9","domains":[{"cath_id":"3.30.40.10","chopping":"30-126","consensus_level":"high","plddt":92.3057,"start":30,"end":126},{"cath_id":"1.10.150.50","chopping":"180-250","consensus_level":"high","plddt":91.153,"start":180,"end":250},{"cath_id":"-","chopping":"258-450","consensus_level":"high","plddt":84.1887,"start":258,"end":450}],"viewer_url":"https://alphafold.ebi.ac.uk/entry/Q9NZS9","model_url":"https://alphafold.ebi.ac.uk/files/AF-Q9NZS9-F1-model_v6.cif","pae_url":"https://alphafold.ebi.ac.uk/files/AF-Q9NZS9-F1-predicted_aligned_error_v6.png","plddt_mean":81.94},"mouse_models":{"mgi_url":"https://www.informatics.jax.org/marker/summary?nomen=BFAR","jax_strain_url":"https://www.jax.org/strain/search?query=BFAR"},"sequence":{"accession":"Q9NZS9","fasta_url":"https://rest.uniprot.org/uniprotkb/Q9NZS9.fasta","uniprot_url":"https://www.uniprot.org/uniprotkb/Q9NZS9/entry","alphafold_viewer_url":"https://alphafold.ebi.ac.uk/entry/Q9NZS9"}},"corpus_meta":[{"pmid":"14645856","id":"PMC_14645856","title":"BAR 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BAR can bridge procaspase-8 and Bcl-2 into a protein complex, and is anchored in intracellular membranes where Bcl-2 resides.\",\n      \"method\": \"Yeast-based screen for inhibitors of Bax-induced cell death; Co-immunoprecipitation; domain mutagenesis; mammalian and yeast cell death assays\",\n      \"journal\": \"Proceedings of the National Academy of Sciences of the United States of America\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1-2 — multiple orthogonal methods including yeast screen, Co-IP, domain deletion/mutagenesis, and functional cell death assays in both yeast and mammalian cells in a single foundational study\",\n      \"pmids\": [\"10716992\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2003,\n      \"finding\": \"BAR (BFAR) protein localizes predominantly to the endoplasmic reticulum (ER) in neuronal cells, as demonstrated by immunofluorescence microscopy. Overexpression of BAR in CSM 14.1 neuronal cells conferred significant protection from diverse cell death stimuli including mitochondrial pathway activators, TNF-family death receptor stimulation, and ER stress. Downregulation of BAR by antisense oligonucleotides sensitized neuronal cells to apoptosis. Novel interaction partners identified include HIP1, Hippi, and Bap31.\",\n      \"method\": \"Immunofluorescence microscopy; overexpression with cell viability assays; antisense oligonucleotide knockdown; co-immunoprecipitation/pulldown for interaction partners\",\n      \"journal\": \"Cell death and differentiation\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 — multiple orthogonal methods (localization, gain-of-function, loss-of-function, interaction studies) in a single study with defined phenotypic readouts\",\n      \"pmids\": [\"14502241\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2023,\n      \"finding\": \"BFAR is a direct interaction protein of bufalin (identified by human proteome microarray with 21,838 proteins) and promotes GC occurrence and metastasis by activating the PI3K/AKT/mTOR signaling pathway in vitro and in vivo. Bufalin inhibits GC by downregulating BFAR expression, reversing the pro-tumorigenic effect. Molecular docking predicted binding sites between bufalin and BFAR.\",\n      \"method\": \"Human proteome microarray; molecular docking; Western blotting; CCK-8 proliferation assay; scratch wound healing and transwell migration assays; in vivo tumor model; siRNA knockdown\",\n      \"journal\": \"Apoptosis : an international journal on programmed cell death\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2-3 — proteome microarray identification plus functional validation in vitro and in vivo, but mechanistic detail of BFAR-PI3K/AKT/mTOR linkage is limited to expression/activity measurements without direct biochemical reconstitution\",\n      \"pmids\": [\"37253905\"],\n      \"is_preprint\": false\n    }\n  ],\n  \"current_model\": \"BFAR (Bifunctional Apoptosis Regulator) is an intracellular membrane-anchored scaffold protein (localized to the ER) that bridges the extrinsic and intrinsic apoptosis pathways via its DED-like domain (binding procaspase-8/-10 to suppress Fas-induced death) and its SAM domain (binding Bcl-2/Bcl-XL to suppress Bax-induced death), forming a procaspase-8/Bcl-2 complex; it is highly expressed in neurons and confers broad protection against apoptosis, while also activating the PI3K/AKT/mTOR pathway to promote cell survival and tumor progression.\"\n}\n```","stage2_raw":"```json\n{\n  \"mechanistic_narrative\": \"BFAR (Bifunctional Apoptosis Regulator) is an intracellular membrane-anchored scaffold protein that bridges the extrinsic and intrinsic apoptosis pathways: its DED-like domain binds procaspases-8 and -10 to suppress Fas-induced cell death, while its SAM domain interacts with Bcl-2 and Bcl-XL to suppress Bax-induced apoptosis, enabling formation of a procaspase-8/Bcl-2 complex [PMID:10716992]. BFAR localizes predominantly to the endoplasmic reticulum, is highly expressed in neurons, and confers broad cytoprotection against mitochondrial, death-receptor, and ER-stress-mediated apoptosis; its knockdown sensitizes neuronal cells to cell death [PMID:14502241]. BFAR also promotes gastric cancer cell proliferation and metastasis through activation of the PI3K/AKT/mTOR signaling pathway [PMID:37253905].\",\n  \"teleology\": [\n    {\n      \"year\": 2000,\n      \"claim\": \"The foundational question of how a single protein could suppress both extrinsic and intrinsic apoptosis was answered by the identification of BFAR as a bifunctional scaffold whose DED-like domain engages procaspases-8/-10 and whose SAM domain engages Bcl-2/Bcl-XL, physically bridging the two pathways.\",\n      \"evidence\": \"Yeast-based screen for Bax-death suppressors, co-immunoprecipitation, domain deletion/mutagenesis, and functional cell death assays in yeast and mammalian cells\",\n      \"pmids\": [\"10716992\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\n        \"Subcellular localization in mammalian cells was inferred but not directly mapped by imaging\",\n        \"In vivo physiological relevance (knockout animal) not established\",\n        \"Structural basis of SAM–Bcl-2 and DED–procaspase interactions unresolved\"\n      ]\n    },\n    {\n      \"year\": 2003,\n      \"claim\": \"The open question of where BFAR acts and whether it is physiologically relevant in a defined cell type was resolved by demonstrating ER localization in neurons, broad cytoprotection against mitochondrial, death-receptor, and ER-stress stimuli, and identification of additional partners (HIP1, Hippi, Bap31).\",\n      \"evidence\": \"Immunofluorescence microscopy, overexpression/cell viability assays, antisense oligonucleotide knockdown, co-immunoprecipitation/pulldown in neuronal CSM 14.1 cells\",\n      \"pmids\": [\"14502241\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\n        \"Functional significance of HIP1, Hippi, and Bap31 interactions for BFAR's anti-apoptotic activity not dissected\",\n        \"No genetic loss-of-function model in vivo\",\n        \"Mechanism by which ER-localized BFAR protects against diverse death stimuli not delineated\"\n      ]\n    },\n    {\n      \"year\": 2023,\n      \"claim\": \"Beyond apoptosis regulation, BFAR was linked to pro-tumorigenic signaling: it promotes gastric cancer cell proliferation and metastasis via PI3K/AKT/mTOR pathway activation, and is a direct target of the anti-cancer compound bufalin.\",\n      \"evidence\": \"Human proteome microarray, molecular docking, siRNA knockdown, proliferation/migration assays, and in vivo xenograft tumor model\",\n      \"pmids\": [\"37253905\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\n        \"Direct biochemical mechanism linking BFAR to PI3K/AKT/mTOR activation not reconstituted\",\n        \"Whether the oncogenic role is dependent on or independent of BFAR's classical anti-apoptotic scaffold function is unknown\",\n        \"Bufalin–BFAR binding site validated only by molecular docking, not by mutagenesis or structural determination\"\n      ]\n    },\n    {\n      \"year\": null,\n      \"claim\": \"Key unresolved questions include the structural basis of BFAR's multi-domain interactions, the in vivo phenotype of BFAR loss-of-function, and the mechanism by which an ER-localized apoptosis scaffold activates PI3K/AKT/mTOR signaling.\",\n      \"evidence\": \"\",\n      \"pmids\": [],\n      \"confidence\": \"High\",\n      \"gaps\": [\n        \"No crystal or cryo-EM structure of BFAR or its complexes\",\n        \"No knockout or conditional knockout animal model reported\",\n        \"Relationship between ER-localized anti-apoptotic function and PI3K/AKT/mTOR activation uncharacterized\"\n      ]\n    }\n  ],\n  \"mechanism_profile\": {\n    \"molecular_activity\": [\n      {\"term_id\": \"GO:0060090\", \"supporting_discovery_ids\": [0, 1]}\n    ],\n    \"localization\": [\n      {\"term_id\": \"GO:0005783\", \"supporting_discovery_ids\": [1]}\n    ],\n    \"pathway\": [\n      {\"term_id\": \"R-HSA-5357801\", \"supporting_discovery_ids\": [0, 1]},\n      {\"term_id\": \"R-HSA-162582\", \"supporting_discovery_ids\": [2]}\n    ],\n    \"complexes\": [],\n    \"partners\": [\"BCL2\", \"BCL2L1\", \"CASP8\", \"CASP10\", \"HIP1\", \"BAP31\"],\n    \"other_free_text\": []\n  }\n}\n```"}