{"gene":"FAM177A1","run_date":"2026-06-09T23:54:43","timeline":{"discoveries":[{"year":2021,"finding":"FAM177A1 acts as a negative regulator of IL-1β-induced NF-κB signaling by competitively binding the E3 ubiquitin ligase TRAF6, thereby impairing TRAF6's interaction with the E2-conjugating enzyme Ubc13, inhibiting TRAF6-mediated polyubiquitination and downstream signaling molecule recruitment.","method":"Overexpression and knockdown in human cells, Co-IP/competitive binding assays, NF-κB reporter assays, inflammatory gene transcription analysis","journal":"Journal of immunology","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — reciprocal binding assays and functional rescue in human cells, single lab, two orthogonal methods (Co-IP and reporter assays)","pmids":["34799425"],"is_preprint":false},{"year":2024,"finding":"FAM177A1 localizes to the Golgi complex in mammalian and zebrafish cells, and its loss-of-function causes dysregulation of pathways associated with apoptosis, inflammation, and negative regulation of cell proliferation, as shown by intersecting RNA-seq and metabolomic data from FAM177A1-deficient human fibroblasts and zebrafish larvae.","method":"Subcellular localization by fluorescence microscopy, loss-of-function variants in human fibroblasts and zebrafish, RNA-seq, metabolomics","journal":"Genetics in medicine","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — direct localization imaging plus multi-omic functional readout, single lab, two orthogonal methods","pmids":["38767059"],"is_preprint":false},{"year":2024,"finding":"FAM177A1 is a functional partner of VPS13B at the Golgi complex; loss of FAM177A1 phenocopies VPS13B KO by delaying Golgi complex reformation after Brefeldin A-induced disruption, and fam177a1 genetically interacts with vps13b in zebrafish.","method":"VPS13B and FAM177A1 KO cell lines, Brefeldin A washout assay for Golgi reformation, genetic interaction in zebrafish, super-resolution microscopy for localization","journal":"The Journal of cell biology","confidence":"High","confidence_rationale":"Tier 2 / Strong — KO phenotype replicated across mammalian cells and zebrafish genetic epistasis, multiple orthogonal methods, published in peer-reviewed journal","pmids":["39331042"],"is_preprint":false},{"year":2023,"finding":"FAM177A1 is a functional partner of VPS13B at the Golgi complex interface; loss of FAM177A1 delays Golgi reformation after Brefeldin A disruption, phenocopying VPS13B KO, and fam177a1 genetically interacts with vps13b in zebrafish (preprint version of the published study).","method":"KO cell lines, Brefeldin A washout assay, zebrafish genetic interaction, super-resolution microscopy","journal":"bioRxiv","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — same findings as published version but preprint; superseded by peer-reviewed publication PMID:39331042","pmids":["38187698"],"is_preprint":true},{"year":2009,"finding":"C14orf24 (FAM177A1) shows dominant cytoplasmic localization, high expression in proliferating cells, and gradually decreased expression during neurogenesis; its mRNA is a direct target of miR-124a, which mediates translational repression during neuronal differentiation of P19 cells.","method":"qRT-PCR, RT-PCR, luciferase reporter assay (in vitro and in vivo) with miR-124a overexpression in P19 cells, subcellular fractionation","journal":"The FEBS journal","confidence":"Medium","confidence_rationale":"Tier 3 / Moderate — luciferase reporter validates 3'-UTR targeting, subcellular localization by fractionation, single lab but two orthogonal methods","pmids":["19663910"],"is_preprint":false},{"year":2026,"finding":"FAM177A1 disrupts the SIRT3-SOD2 protein interaction, leading to elevated SOD2 K68 acetylation, reduced SOD2 activity and stability, increased mitochondrial ROS, impaired mitochondrial membrane potential, and metabolic reprogramming (reduced OXPHOS, increased glycolysis) that drives VSMC phenotypic switching; FAM177A1 deficiency suppresses neointimal hyperplasia and atherosclerosis in multiple animal models.","method":"Global Fam177a1 KO rats with carotid balloon injury, VSMC-specific AAV-mediated knockdown in carotid ligation mice, ApoE-/- atherosclerosis model, in vitro PDGF-BB stimulation, Co-IP for SIRT3-SOD2 interaction, acetylation assays, mitochondrial functional assays (ROS, ΔΨm, OXPHOS, glycolysis)","journal":"International journal of biological sciences","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — multiple animal models and in vitro validation, Co-IP for mechanism, single lab, multiple orthogonal methods but newly published (2026)","pmids":["41943851"],"is_preprint":false}],"current_model":"FAM177A1 is a Golgi-localized, cytoplasmic protein that functions as a partner of VPS13B in Golgi membrane dynamics (Golgi reformation after stress), negatively regulates IL-1β/NF-κB signaling by competitively binding TRAF6 to impair its E2-conjugating enzyme Ubc13 interaction, and disrupts the mitochondrial SIRT3-SOD2 axis to increase ROS and drive vascular smooth muscle cell phenotypic switching; its expression is downregulated during neurogenesis via miR-124a-mediated repression."},"narrative":{"mechanistic_narrative":"FAM177A1 is a Golgi-associated protein that functions in Golgi membrane dynamics and intersects with inflammatory and mitochondrial signaling pathways [PMID:39331042, PMID:38767059, PMID:41943851]. At the Golgi complex it acts as a functional partner of VPS13B: loss of FAM177A1 phenocopies VPS13B knockout by delaying Golgi reformation after Brefeldin A-induced disruption, and fam177a1 genetically interacts with vps13b in zebrafish [PMID:39331042]. Loss of FAM177A1 in human fibroblasts and zebrafish dysregulates pathways linked to apoptosis, inflammation, and negative regulation of cell proliferation [PMID:38767059]. In immune signaling, FAM177A1 negatively regulates IL-1β-induced NF-κB activation by competitively binding the E3 ubiquitin ligase TRAF6, impairing its interaction with the E2 enzyme Ubc13 and thereby inhibiting TRAF6-mediated polyubiquitination [PMID:34799425]. In vascular smooth muscle cells, FAM177A1 disrupts the mitochondrial SIRT3-SOD2 interaction, elevating SOD2 K68 acetylation and mitochondrial ROS while reprogramming metabolism toward glycolysis to drive VSMC phenotypic switching; its deficiency suppresses neointimal hyperplasia and atherosclerosis in animal models [PMID:41943851].","teleology":[{"year":2009,"claim":"Initial characterization established where FAM177A1 (C14orf24) resides and how its expression is controlled, showing it is cytoplasmic, enriched in proliferating cells, and silenced during neuronal differentiation.","evidence":"qRT-PCR, subcellular fractionation, and luciferase reporter assays with miR-124a in P19 cells","pmids":["19663910"],"confidence":"Medium","gaps":["No molecular function assigned beyond expression pattern","miR-124a regulation shown in one cell model only"]},{"year":2021,"claim":"The first defined molecular activity placed FAM177A1 in innate immune signaling as a brake on inflammation, answering how it engages the ubiquitin machinery.","evidence":"Overexpression/knockdown, Co-IP/competitive binding, and NF-κB reporter assays in human cells","pmids":["34799425"],"confidence":"Medium","gaps":["Single lab, no in vivo confirmation","Structural basis of TRAF6 competition not resolved","Relationship to Golgi function unclear"]},{"year":2024,"claim":"Subcellular and multi-omic profiling identified FAM177A1 as a Golgi protein whose loss perturbs apoptosis, inflammation, and proliferation programs, linking its localization to broad cellular consequences.","evidence":"Fluorescence microscopy, loss-of-function variants in human fibroblasts and zebrafish, RNA-seq, metabolomics","pmids":["38767059"],"confidence":"Medium","gaps":["Causal mechanism from Golgi localization to transcriptomic changes not established","No direct molecular partner identified in this study"]},{"year":2024,"claim":"Epistasis and phenocopy experiments defined FAM177A1's Golgi role mechanistically by placing it functionally with VPS13B in Golgi reformation after stress.","evidence":"VPS13B/FAM177A1 KO cell lines, Brefeldin A washout Golgi-reformation assay, zebrafish genetic interaction, super-resolution microscopy","pmids":["39331042"],"confidence":"High","gaps":["Direct physical interaction with VPS13B not biochemically demonstrated","Molecular activity of FAM177A1 at the Golgi membrane unknown"]},{"year":2026,"claim":"In vivo disease modeling extended FAM177A1 to mitochondrial regulation, showing it disrupts the SIRT3-SOD2 axis to raise ROS and drive vascular smooth muscle cell phenotypic switching.","evidence":"Fam177a1 KO rats with balloon injury, AAV knockdown mice, ApoE-/- model, Co-IP, acetylation and mitochondrial functional assays","pmids":["41943851"],"confidence":"Medium","gaps":["How a Golgi protein modulates a mitochondrial interaction is unresolved","Single lab, newly published","Direct binding of FAM177A1 to SIRT3 or SOD2 not established"]},{"year":null,"claim":"The unifying molecular activity linking FAM177A1's Golgi, immune, and mitochondrial roles remains undefined.","evidence":"","pmids":[],"confidence":"Medium","gaps":["No biochemical activity or domain function assigned","Whether the TRAF6, VPS13B, and SIRT3-SOD2 effects share a common mechanism is unknown","No structural model available"]}],"mechanism_profile":{"molecular_activity":[{"term_id":"GO:0098772","term_label":"molecular function regulator activity","supporting_discovery_ids":[0,5]}],"localization":[{"term_id":"GO:0005794","term_label":"Golgi apparatus","supporting_discovery_ids":[1,2]},{"term_id":"GO:0005829","term_label":"cytosol","supporting_discovery_ids":[4]}],"pathway":[{"term_id":"R-HSA-1852241","term_label":"Organelle biogenesis and maintenance","supporting_discovery_ids":[2]},{"term_id":"R-HSA-168256","term_label":"Immune System","supporting_discovery_ids":[0]}],"complexes":[],"partners":["VPS13B","TRAF6"],"other_free_text":[]}},"prefetch_data":{"uniprot":{"accession":"Q8N128","full_name":"Protein FAM177A1","aliases":[],"length_aa":213,"mass_kda":23.8,"function":"","subcellular_location":"Golgi apparatus","url":"https://www.uniprot.org/uniprotkb/Q8N128/entry"},"depmap":{"release":"DepMap","has_data":true,"is_common_essential":false,"resolved_as":"","url":"https://depmap.org/portal/gene/FAM177A1","classification":"Not Classified","n_dependent_lines":27,"n_total_lines":1208,"dependency_fraction":0.022350993377483443},"opencell":{"profiled":false,"resolved_as":"","ensg_id":"","cell_line_id":"","localizations":[],"interactors":[],"url":"https://opencell.sf.czbiohub.org/search/FAM177A1","total_profiled":1310},"omim":[{"mim_id":"621152","title":"NEURODEVELOPMENTAL DISORDER WITH WHITE MATTER ABNORMALITIES AND GAIT DISTURBANCE; NEDWMG","url":"https://www.omim.org/entry/621152"},{"mim_id":"619181","title":"FAMILY WITH SEQUENCE SIMILARITY 177, MEMBER A1; FAM177A1","url":"https://www.omim.org/entry/619181"},{"mim_id":"615239","title":"MICRO RNA 7-1; MIR7-1","url":"https://www.omim.org/entry/615239"},{"mim_id":"609327","title":"MICRO RNA 124-1; MIR124-1","url":"https://www.omim.org/entry/609327"},{"mim_id":"607817","title":"VACUOLAR PROTEIN SORTING 13 HOMOLOG B; VPS13B","url":"https://www.omim.org/entry/607817"}],"hpa":{"profiled":true,"resolved_as":"","reliability":"Approved","locations":[{"location":"Vesicles","reliability":"Approved"},{"location":"Nucleoplasm","reliability":"Additional"}],"tissue_specificity":"Low tissue specificity","tissue_distribution":"Detected in all","driving_tissues":[],"url":"https://www.proteinatlas.org/search/FAM177A1"},"hgnc":{"alias_symbol":[],"prev_symbol":["C14orf24"]},"alphafold":{"accession":"Q8N128","domains":[{"cath_id":"-","chopping":"85-130","consensus_level":"medium","plddt":77.9537,"start":85,"end":130},{"cath_id":"1.20.5","chopping":"131-172","consensus_level":"medium","plddt":90.9395,"start":131,"end":172}],"viewer_url":"https://alphafold.ebi.ac.uk/entry/Q8N128","model_url":"https://alphafold.ebi.ac.uk/files/AF-Q8N128-F1-model_v6.cif","pae_url":"https://alphafold.ebi.ac.uk/files/AF-Q8N128-F1-predicted_aligned_error_v6.png","plddt_mean":63.44},"mouse_models":{"mgi_url":"https://www.informatics.jax.org/marker/summary?nomen=FAM177A1","jax_strain_url":"https://www.jax.org/strain/search?query=FAM177A1"},"sequence":{"accession":"Q8N128","fasta_url":"https://rest.uniprot.org/uniprotkb/Q8N128.fasta","uniprot_url":"https://www.uniprot.org/uniprotkb/Q8N128/entry","alphafold_viewer_url":"https://alphafold.ebi.ac.uk/entry/Q8N128"}},"corpus_meta":[{"pmid":"25558065","id":"PMC_25558065","title":"Accelerating novel candidate gene discovery in neurogenetic disorders via whole-exome sequencing of prescreened multiplex consanguineous families.","date":"2014","source":"Cell reports","url":"https://pubmed.ncbi.nlm.nih.gov/25558065","citation_count":381,"is_preprint":false},{"pmid":"29228969","id":"PMC_29228969","title":"Race-associated biological differences among luminal A and basal-like breast cancers in the Carolina Breast Cancer Study.","date":"2017","source":"Breast cancer research : BCR","url":"https://pubmed.ncbi.nlm.nih.gov/29228969","citation_count":45,"is_preprint":false},{"pmid":"19663910","id":"PMC_19663910","title":"Noninvasive imaging of microRNA124a-mediated repression of the chromosome 14 ORF 24 gene during neurogenesis.","date":"2009","source":"The FEBS journal","url":"https://pubmed.ncbi.nlm.nih.gov/19663910","citation_count":28,"is_preprint":false},{"pmid":"15205934","id":"PMC_15205934","title":"Microsatellite genotyping of chromosome 14q13.2-14q13 in the vicinity of proteasomal gene PSMA6 and association with Graves' disease in the Latvian population.","date":"2004","source":"Immunogenetics","url":"https://pubmed.ncbi.nlm.nih.gov/15205934","citation_count":13,"is_preprint":false},{"pmid":"39331042","id":"PMC_39331042","title":"VPS13B is localized at the interface between Golgi cisternae and is a functional partner of FAM177A1.","date":"2024","source":"The Journal of cell biology","url":"https://pubmed.ncbi.nlm.nih.gov/39331042","citation_count":11,"is_preprint":false},{"pmid":"34799425","id":"PMC_34799425","title":"FAM177A1 Inhibits IL-1β-Induced Signaling by Impairing TRAF6-Ubc13 Association.","date":"2021","source":"Journal of immunology (Baltimore, Md. : 1950)","url":"https://pubmed.ncbi.nlm.nih.gov/34799425","citation_count":11,"is_preprint":false},{"pmid":"38767059","id":"PMC_38767059","title":"Loss of function of FAM177A1, a Golgi complex localized protein, causes a novel neurodevelopmental disorder.","date":"2024","source":"Genetics in medicine : official journal of the American College of Medical Genetics","url":"https://pubmed.ncbi.nlm.nih.gov/38767059","citation_count":10,"is_preprint":false},{"pmid":"40113264","id":"PMC_40113264","title":"Integration of transcriptomics and long-read genomics prioritizes structural variants in rare disease.","date":"2025","source":"Genome research","url":"https://pubmed.ncbi.nlm.nih.gov/40113264","citation_count":8,"is_preprint":false},{"pmid":"36825008","id":"PMC_36825008","title":"A large-scale plasma proteome Mendelian randomization study identifies novel causal plasma proteins related to primary biliary cholangitis.","date":"2023","source":"Frontiers in immunology","url":"https://pubmed.ncbi.nlm.nih.gov/36825008","citation_count":8,"is_preprint":false},{"pmid":"20136554","id":"PMC_20136554","title":"Identification of a novel candidate locus for juvenile idiopathic arthritis at 14q13.2 in the Latvian population by association analysis with microsatellite markers.","date":"2010","source":"DNA and cell biology","url":"https://pubmed.ncbi.nlm.nih.gov/20136554","citation_count":8,"is_preprint":false},{"pmid":"38585781","id":"PMC_38585781","title":"Integration of transcriptomics and long-read genomics prioritizes structural variants in rare disease.","date":"2024","source":"medRxiv : the preprint server for health sciences","url":"https://pubmed.ncbi.nlm.nih.gov/38585781","citation_count":6,"is_preprint":false},{"pmid":"27488439","id":"PMC_27488439","title":"Co-stimulatory CD28 and transcription factor NFKB1 gene variants affect idiopathic recurrent miscarriages.","date":"2016","source":"Journal of human genetics","url":"https://pubmed.ncbi.nlm.nih.gov/27488439","citation_count":4,"is_preprint":false},{"pmid":"38187698","id":"PMC_38187698","title":"VPS13B is localized at the cis-trans Golgi complex interface and is a functional partner of FAM177A1.","date":"2023","source":"bioRxiv : the preprint server for biology","url":"https://pubmed.ncbi.nlm.nih.gov/38187698","citation_count":3,"is_preprint":false},{"pmid":"34659352","id":"PMC_34659352","title":"Genome-Wide Association of Proprotein Convertase Subtilisin/Kexin Type 9 Plasma Levels in the ELSA-Brasil Study.","date":"2021","source":"Frontiers in genetics","url":"https://pubmed.ncbi.nlm.nih.gov/34659352","citation_count":3,"is_preprint":false},{"pmid":"41943851","id":"PMC_41943851","title":"FAM177A1 disrupts SIRT3-SOD2 signaling to drive mitochondrial dysfunction-mediated VSMC phenotypic switching in vascular remodeling.","date":"2026","source":"International journal of biological sciences","url":"https://pubmed.ncbi.nlm.nih.gov/41943851","citation_count":0,"is_preprint":false}],"cost":{"stage1":{"model":"claude-sonnet-4-6","input_tokens":10140,"output_tokens":1677,"usd":0.027787,"stage1_stop_reason":"end_turn"},"stage2":{"model":"claude-opus-4-8","input_tokens":8494,"output_tokens":2117,"usd":0.047697,"stage2_stop_reason":"end_turn"},"total_usd":0.075484,"stage1_batch_id":"msgbatch_01AsR7g8dGTEiEw9U83bJeWn","stage2_batch_id":"msgbatch_01YV5ZyxtFNUZEjxRcpd9jzb","note":"batch pricing = 50% of standard"},"stage1_raw":"```json\n{\n  \"discoveries\": [\n    {\n      \"year\": 2021,\n      \"finding\": \"FAM177A1 acts as a negative regulator of IL-1β-induced NF-κB signaling by competitively binding the E3 ubiquitin ligase TRAF6, thereby impairing TRAF6's interaction with the E2-conjugating enzyme Ubc13, inhibiting TRAF6-mediated polyubiquitination and downstream signaling molecule recruitment.\",\n      \"method\": \"Overexpression and knockdown in human cells, Co-IP/competitive binding assays, NF-κB reporter assays, inflammatory gene transcription analysis\",\n      \"journal\": \"Journal of immunology\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — reciprocal binding assays and functional rescue in human cells, single lab, two orthogonal methods (Co-IP and reporter assays)\",\n      \"pmids\": [\"34799425\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2024,\n      \"finding\": \"FAM177A1 localizes to the Golgi complex in mammalian and zebrafish cells, and its loss-of-function causes dysregulation of pathways associated with apoptosis, inflammation, and negative regulation of cell proliferation, as shown by intersecting RNA-seq and metabolomic data from FAM177A1-deficient human fibroblasts and zebrafish larvae.\",\n      \"method\": \"Subcellular localization by fluorescence microscopy, loss-of-function variants in human fibroblasts and zebrafish, RNA-seq, metabolomics\",\n      \"journal\": \"Genetics in medicine\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — direct localization imaging plus multi-omic functional readout, single lab, two orthogonal methods\",\n      \"pmids\": [\"38767059\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2024,\n      \"finding\": \"FAM177A1 is a functional partner of VPS13B at the Golgi complex; loss of FAM177A1 phenocopies VPS13B KO by delaying Golgi complex reformation after Brefeldin A-induced disruption, and fam177a1 genetically interacts with vps13b in zebrafish.\",\n      \"method\": \"VPS13B and FAM177A1 KO cell lines, Brefeldin A washout assay for Golgi reformation, genetic interaction in zebrafish, super-resolution microscopy for localization\",\n      \"journal\": \"The Journal of cell biology\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — KO phenotype replicated across mammalian cells and zebrafish genetic epistasis, multiple orthogonal methods, published in peer-reviewed journal\",\n      \"pmids\": [\"39331042\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2023,\n      \"finding\": \"FAM177A1 is a functional partner of VPS13B at the Golgi complex interface; loss of FAM177A1 delays Golgi reformation after Brefeldin A disruption, phenocopying VPS13B KO, and fam177a1 genetically interacts with vps13b in zebrafish (preprint version of the published study).\",\n      \"method\": \"KO cell lines, Brefeldin A washout assay, zebrafish genetic interaction, super-resolution microscopy\",\n      \"journal\": \"bioRxiv\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — same findings as published version but preprint; superseded by peer-reviewed publication PMID:39331042\",\n      \"pmids\": [\"38187698\"],\n      \"is_preprint\": true\n    },\n    {\n      \"year\": 2009,\n      \"finding\": \"C14orf24 (FAM177A1) shows dominant cytoplasmic localization, high expression in proliferating cells, and gradually decreased expression during neurogenesis; its mRNA is a direct target of miR-124a, which mediates translational repression during neuronal differentiation of P19 cells.\",\n      \"method\": \"qRT-PCR, RT-PCR, luciferase reporter assay (in vitro and in vivo) with miR-124a overexpression in P19 cells, subcellular fractionation\",\n      \"journal\": \"The FEBS journal\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 3 / Moderate — luciferase reporter validates 3'-UTR targeting, subcellular localization by fractionation, single lab but two orthogonal methods\",\n      \"pmids\": [\"19663910\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2026,\n      \"finding\": \"FAM177A1 disrupts the SIRT3-SOD2 protein interaction, leading to elevated SOD2 K68 acetylation, reduced SOD2 activity and stability, increased mitochondrial ROS, impaired mitochondrial membrane potential, and metabolic reprogramming (reduced OXPHOS, increased glycolysis) that drives VSMC phenotypic switching; FAM177A1 deficiency suppresses neointimal hyperplasia and atherosclerosis in multiple animal models.\",\n      \"method\": \"Global Fam177a1 KO rats with carotid balloon injury, VSMC-specific AAV-mediated knockdown in carotid ligation mice, ApoE-/- atherosclerosis model, in vitro PDGF-BB stimulation, Co-IP for SIRT3-SOD2 interaction, acetylation assays, mitochondrial functional assays (ROS, ΔΨm, OXPHOS, glycolysis)\",\n      \"journal\": \"International journal of biological sciences\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — multiple animal models and in vitro validation, Co-IP for mechanism, single lab, multiple orthogonal methods but newly published (2026)\",\n      \"pmids\": [\"41943851\"],\n      \"is_preprint\": false\n    }\n  ],\n  \"current_model\": \"FAM177A1 is a Golgi-localized, cytoplasmic protein that functions as a partner of VPS13B in Golgi membrane dynamics (Golgi reformation after stress), negatively regulates IL-1β/NF-κB signaling by competitively binding TRAF6 to impair its E2-conjugating enzyme Ubc13 interaction, and disrupts the mitochondrial SIRT3-SOD2 axis to increase ROS and drive vascular smooth muscle cell phenotypic switching; its expression is downregulated during neurogenesis via miR-124a-mediated repression.\"\n}\n```","stage2_raw":"{\n  \"mechanistic_narrative\": \"FAM177A1 is a Golgi-associated protein that functions in Golgi membrane dynamics and intersects with inflammatory and mitochondrial signaling pathways [#2, #1, #5]. At the Golgi complex it acts as a functional partner of VPS13B: loss of FAM177A1 phenocopies VPS13B knockout by delaying Golgi reformation after Brefeldin A-induced disruption, and fam177a1 genetically interacts with vps13b in zebrafish [#2]. Loss of FAM177A1 in human fibroblasts and zebrafish dysregulates pathways linked to apoptosis, inflammation, and negative regulation of cell proliferation [#1]. In immune signaling, FAM177A1 negatively regulates IL-1\\u03b2-induced NF-\\u03baB activation by competitively binding the E3 ubiquitin ligase TRAF6, impairing its interaction with the E2 enzyme Ubc13 and thereby inhibiting TRAF6-mediated polyubiquitination [#0]. In vascular smooth muscle cells, FAM177A1 disrupts the mitochondrial SIRT3-SOD2 interaction, elevating SOD2 K68 acetylation and mitochondrial ROS while reprogramming metabolism toward glycolysis to drive VSMC phenotypic switching; its deficiency suppresses neointimal hyperplasia and atherosclerosis in animal models [#5].\",\n  \"teleology\": [\n    {\n      \"year\": 2009,\n      \"claim\": \"Initial characterization established where FAM177A1 (C14orf24) resides and how its expression is controlled, showing it is cytoplasmic, enriched in proliferating cells, and silenced during neuronal differentiation.\",\n      \"evidence\": \"qRT-PCR, subcellular fractionation, and luciferase reporter assays with miR-124a in P19 cells\",\n      \"pmids\": [\"19663910\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"No molecular function assigned beyond expression pattern\", \"miR-124a regulation shown in one cell model only\"]\n    },\n    {\n      \"year\": 2021,\n      \"claim\": \"The first defined molecular activity placed FAM177A1 in innate immune signaling as a brake on inflammation, answering how it engages the ubiquitin machinery.\",\n      \"evidence\": \"Overexpression/knockdown, Co-IP/competitive binding, and NF-\\u03baB reporter assays in human cells\",\n      \"pmids\": [\"34799425\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Single lab, no in vivo confirmation\", \"Structural basis of TRAF6 competition not resolved\", \"Relationship to Golgi function unclear\"]\n    },\n    {\n      \"year\": 2024,\n      \"claim\": \"Subcellular and multi-omic profiling identified FAM177A1 as a Golgi protein whose loss perturbs apoptosis, inflammation, and proliferation programs, linking its localization to broad cellular consequences.\",\n      \"evidence\": \"Fluorescence microscopy, loss-of-function variants in human fibroblasts and zebrafish, RNA-seq, metabolomics\",\n      \"pmids\": [\"38767059\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Causal mechanism from Golgi localization to transcriptomic changes not established\", \"No direct molecular partner identified in this study\"]\n    },\n    {\n      \"year\": 2024,\n      \"claim\": \"Epistasis and phenocopy experiments defined FAM177A1's Golgi role mechanistically by placing it functionally with VPS13B in Golgi reformation after stress.\",\n      \"evidence\": \"VPS13B/FAM177A1 KO cell lines, Brefeldin A washout Golgi-reformation assay, zebrafish genetic interaction, super-resolution microscopy\",\n      \"pmids\": [\"39331042\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Direct physical interaction with VPS13B not biochemically demonstrated\", \"Molecular activity of FAM177A1 at the Golgi membrane unknown\"]\n    },\n    {\n      \"year\": 2026,\n      \"claim\": \"In vivo disease modeling extended FAM177A1 to mitochondrial regulation, showing it disrupts the SIRT3-SOD2 axis to raise ROS and drive vascular smooth muscle cell phenotypic switching.\",\n      \"evidence\": \"Fam177a1 KO rats with balloon injury, AAV knockdown mice, ApoE-/- model, Co-IP, acetylation and mitochondrial functional assays\",\n      \"pmids\": [\"41943851\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"How a Golgi protein modulates a mitochondrial interaction is unresolved\", \"Single lab, newly published\", \"Direct binding of FAM177A1 to SIRT3 or SOD2 not established\"]\n    },\n    {\n      \"year\": null,\n      \"claim\": \"The unifying molecular activity linking FAM177A1's Golgi, immune, and mitochondrial roles remains undefined.\",\n      \"evidence\": \"\",\n      \"pmids\": [],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"No biochemical activity or domain function assigned\", \"Whether the TRAF6, VPS13B, and SIRT3-SOD2 effects share a common mechanism is unknown\", \"No structural model available\"]\n    }\n  ],\n  \"mechanism_profile\": {\n    \"molecular_activity\": [\n      {\"term_id\": \"GO:0098772\", \"supporting_discovery_ids\": [0, 5]}\n    ],\n    \"localization\": [\n      {\"term_id\": \"GO:0005794\", \"supporting_discovery_ids\": [1, 2]},\n      {\"term_id\": \"GO:0005829\", \"supporting_discovery_ids\": [4]}\n    ],\n    \"pathway\": [\n      {\"term_id\": \"R-HSA-1852241\", \"supporting_discovery_ids\": [2]},\n      {\"term_id\": \"R-HSA-168256\", \"supporting_discovery_ids\": [0]}\n    ],\n    \"complexes\": [],\n    \"partners\": [\"VPS13B\", \"TRAF6\"],\n    \"other_free_text\": []\n  }\n}","audit_flag":null,"evaluation":{"faith_supported":4,"faith_total":5,"faith_pct":80.0}}