{"gene":"ELMOD3","run_date":"2026-04-28T17:46:03","timeline":{"discoveries":[{"year":2013,"finding":"Recombinant human GST-ELMOD3 exhibits GTPase-activating protein (GAP) activity against the Arl2 GTPase in vitro; this activity is completely abolished by the p.Leu265Ser mutation in the ELMO domain.","method":"In vitro GAP assay with recombinant GST-ELMOD3; active-site mutagenesis (p.Leu265Ser)","journal":"PLoS genetics","confidence":"High","confidence_rationale":"Tier 1 — direct in vitro biochemical reconstitution with mutagenesis confirmation","pmids":["24039609"],"is_preprint":false},{"year":2013,"finding":"ELMOD3 co-localizes with the actin cytoskeleton in MDCK cells and with actin-based microvilli of LLC-PK1-CL4 epithelial cells; the p.Leu265Ser ELMO-domain mutation impairs this co-localization, linking the ELMO domain to actin association.","method":"Fluorescence co-localization of tagged ELMOD3 with actin in cell lines; super-resolution imaging; mutant comparison","journal":"PLoS genetics","confidence":"High","confidence_rationale":"Tier 2 — direct localization experiment with functional consequence demonstrated by disease mutation","pmids":["24039609"],"is_preprint":false},{"year":2013,"finding":"In rodent inner ear sensory epithelia, ELMOD3 is most prominently expressed in the stereocilia of cochlear hair cells.","method":"Immunofluorescence/localization in cochlear tissue sections","journal":"PLoS genetics","confidence":"Medium","confidence_rationale":"Tier 2 — direct localization experiment in native tissue, single lab","pmids":["24039609"],"is_preprint":false},{"year":2018,"finding":"The p.His171Arg mutation in ELMOD3 results in abnormal subcellular localization and faster protein decay (shorter half-life) compared to wild-type ELMOD3.","method":"Immunofluorescence staining; Western blot protein stability/degradation assay in cell lines","journal":"Human genetics","confidence":"Medium","confidence_rationale":"Tier 2 — two orthogonal methods (localization + stability) in a single lab","pmids":["29713870"],"is_preprint":false},{"year":2019,"finding":"Knockout of Elmod3 in mice (CRISPR/Cas9) causes progressive hearing loss accompanied by shortening and fusion of inner hair cell stereocilia, progressive degeneration of outer hair cell stereocilia, and markedly reduced F-actin cytoskeleton expression in the cochlea, demonstrating ELMOD3's role in maintaining actin dynamics in cochlear hair cells.","method":"CRISPR/Cas9 Elmod3 knockout mouse; auditory brainstem response; confocal imaging of F-actin and stereocilia morphology","journal":"Human molecular genetics","confidence":"High","confidence_rationale":"Tier 2 — clean KO with defined cellular phenotype (stereocilia morphology + actin) using multiple readouts","pmids":["31628468"],"is_preprint":false},{"year":2021,"finding":"ELMOD3 (along with ELMOD1) acts at the Golgi and at cilia to regulate ciliogenesis; deletion of Elmod3 in mouse embryonic fibroblasts impairs primary cilia formation, causes loss of a subset of ciliary proteins, and results in accumulation of ciliary proteins at the Golgi, consistent with a role in Golgi-to-cilia trafficking. These phenotypes are reversed by expression of activating mutants of ARL3 or ARL16, placing ELMOD3 upstream of these ARF-family GTPases.","method":"Elmod3 deletion MEF lines; immunofluorescence of cilia and Golgi markers; epistasis with constitutively active ARL3/ARL16 mutants","journal":"Molecular biology of the cell","confidence":"High","confidence_rationale":"Tier 2 — genetic epistasis with activating mutants and multiple cellular readouts in a clean KO background","pmids":["34818063"],"is_preprint":false},{"year":2023,"finding":"In Ciona notochord, ELMOD3 physically interacts with Rab1A and with lipid-raft protein Flotillin2, regulating Flotillin2 subcellular localization; ELMOD3 functions upstream in a cascade (ELMOD3→Rab1A→Flotillin2) that drives vesicle trafficking from cytoplasm to the apical membrane required for lumen formation.","method":"Co-IP/pulldown interaction assays; loss-of-function (morpholino/mutant) rescue experiments; subcellular localization imaging in Ciona notochord","journal":"Open biology","confidence":"Medium","confidence_rationale":"Tier 2/3 — interaction + epistasis in a non-mammalian deuterostome model, single lab","pmids":["36918025"],"is_preprint":false},{"year":2024,"finding":"The ELMO domain of ELMOD3 directly interacts with β-catenin in gastric cancer cells, increasing β-catenin levels and promoting downstream Wnt target gene expression; ELMOD3 knockout decreases β-catenin signaling, elevates E-cadherin, suppresses RAF/MEK/ERK signaling, and disrupts F-actin cytoskeleton formation.","method":"Co-IP (ELMO domain interaction with β-catenin); ELMOD3 knockout cells; xenograft tumor model; Western blot pathway analysis","journal":"FASEB journal","confidence":"Medium","confidence_rationale":"Tier 2/3 — Co-IP for interaction plus KO with multiple pathway readouts, single lab","pmids":["39621020"],"is_preprint":false},{"year":2025,"finding":"The p.Gly214Ser ELMOD3 mutation causes rapid protein degradation and impairs co-localization with F-actin; molecular modeling indicates the substitution introduces steric clashes with adjacent residues Ala160 and Cys162, disrupting protein stability.","method":"Protein stability assay; fluorescence co-localization with F-actin; molecular modeling/structural analysis","journal":"bioRxiv (preprint)","confidence":"Low","confidence_rationale":"Tier 3 — single lab, preprint, modeling plus cell-based assays without in vitro reconstitution","pmids":["bio_10.1101_2025.02.11.25321773"],"is_preprint":true}],"current_model":"ELMOD3 is an ARF/ARL-family GTPase-activating protein (GAP) whose ELMO domain catalyzes GTP hydrolysis on ARL2 (and related ARL GTPases), associates with the actin cytoskeleton in hair-cell stereocilia and epithelial microvilli, acts at the Golgi and cilia to regulate Golgi-to-cilia vesicle trafficking (upstream of ARL3/ARL16), and in gastric cancer cells interacts with β-catenin to modulate Wnt and RAF/MEK/ERK signaling; loss of ELMOD3 function disrupts stereocilia actin dynamics causing progressive sensorineural deafness."},"narrative":{"teleology":[{"year":2013,"claim":"Establishing the enzymatic identity of ELMOD3 as an ARL2 GAP and linking its ELMO domain to actin association resolved the question of what molecular activity the protein provides and where it acts in cells.","evidence":"In vitro GAP assay with recombinant GST-ELMOD3, mutagenesis of p.Leu265Ser, and fluorescence co-localization with actin in MDCK and LLC-PK1-CL4 cells; immunofluorescence in rodent cochlea","pmids":["24039609"],"confidence":"High","gaps":["No structure of the ELMO domain bound to ARL2 is available","Substrate selectivity across the broader ARF/ARL family was not tested","Mechanism by which GAP activity promotes actin co-localization is unclear"]},{"year":2018,"claim":"Demonstrating that the p.His171Arg mutation destabilizes ELMOD3 protein and mislocalizes it provided a second independent disease-associated mechanism (protein instability) beyond catalytic loss.","evidence":"Immunofluorescence and Western blot protein decay assays comparing wild-type and p.His171Arg ELMOD3 in cell lines","pmids":["29713870"],"confidence":"Medium","gaps":["Degradation pathway (proteasomal vs. lysosomal) not identified","Whether reduced protein levels alone explain pathogenicity or whether mislocalization contributes independently is unresolved"]},{"year":2019,"claim":"Elmod3 knockout mice established that ELMOD3 is required in vivo for maintaining stereocilia actin architecture and hearing, converting the gene from a candidate to a validated deafness gene.","evidence":"CRISPR/Cas9 Elmod3 knockout mouse; auditory brainstem response; confocal imaging of stereocilia morphology and F-actin","pmids":["31628468"],"confidence":"High","gaps":["Whether ELMOD3 acts cell-autonomously in hair cells versus supporting cells was not tested","Direct ARL2-dependent step in stereocilia maintenance not demonstrated in vivo","Rescue with wild-type ELMOD3 was not shown"]},{"year":2021,"claim":"Deletion of Elmod3 in MEFs revealed a second major cellular function—regulation of Golgi-to-cilia vesicle trafficking—and epistasis with constitutively active ARL3/ARL16 placed ELMOD3 upstream in a GTPase signaling cascade controlling ciliogenesis.","evidence":"Elmod3-deleted MEFs; immunofluorescence of cilia and Golgi markers; rescue by activating ARL3 and ARL16 mutants","pmids":["34818063"],"confidence":"High","gaps":["Direct GAP activity of ELMOD3 toward ARL3 or ARL16 was not biochemically tested","Whether the cilia phenotype contributes to the hearing loss in Elmod3 KO mice is unknown","Cargo identity in the Golgi-to-cilia trafficking pathway is not defined"]},{"year":2023,"claim":"ELMOD3 was shown to interact with Rab1A and Flotillin2 and to regulate apical membrane vesicle trafficking in Ciona notochord, extending its vesicle trafficking role to a non-mammalian system and revealing new physical partners.","evidence":"Co-IP/pulldown assays and loss-of-function/rescue experiments in Ciona notochord","pmids":["36918025"],"confidence":"Medium","gaps":["Whether the ELMOD3–Rab1A interaction is conserved in mammals is untested","Whether ELMOD3 acts as a GAP for Rab1A or functions through a non-catalytic mechanism is unknown","Single invertebrate model system; awaits independent replication"]},{"year":2024,"claim":"Discovery that ELMOD3's ELMO domain directly binds β-catenin to potentiate Wnt and RAF/MEK/ERK signaling in gastric cancer cells opened an unexpected oncogenic signaling role distinct from its GTPase and actin functions.","evidence":"Co-IP of ELMO domain with β-catenin; ELMOD3 knockout gastric cancer cells; xenograft model; Western blot pathway analysis","pmids":["39621020"],"confidence":"Medium","gaps":["Whether β-catenin interaction depends on ELMOD3 GAP activity is untested","Single cancer type examined; generalizability unknown","Mechanism linking ELMOD3 to RAF/MEK/ERK (direct vs. β-catenin-mediated) is unresolved"]},{"year":null,"claim":"The structural basis of ELMO-domain substrate recognition, the full spectrum of GTPase targets, and whether the ciliary, actin, and Wnt/ERK functions are mechanistically coupled or independent remain unresolved.","evidence":"","pmids":[],"confidence":"High","gaps":["No crystal or cryo-EM structure of ELMOD3 alone or in complex with any GTPase","Systematic GAP activity profiling across ARF/ARL/Rab family members has not been performed","Whether the ciliogenesis defect and the stereocilia/actin defect share a common trafficking mechanism is unknown"]}],"mechanism_profile":{"molecular_activity":[{"term_id":"GO:0098772","term_label":"molecular function regulator activity","supporting_discovery_ids":[0,5]},{"term_id":"GO:0008092","term_label":"cytoskeletal protein binding","supporting_discovery_ids":[1,4]}],"localization":[{"term_id":"GO:0005856","term_label":"cytoskeleton","supporting_discovery_ids":[1,4]},{"term_id":"GO:0005794","term_label":"Golgi apparatus","supporting_discovery_ids":[5]},{"term_id":"GO:0005929","term_label":"cilium","supporting_discovery_ids":[5]}],"pathway":[{"term_id":"R-HSA-5653656","term_label":"Vesicle-mediated transport","supporting_discovery_ids":[5,6]},{"term_id":"R-HSA-162582","term_label":"Signal Transduction","supporting_discovery_ids":[5,7]}],"complexes":[],"partners":["ARL2","ARL3","ARL16","CTNNB1","RAB1A","FLOT2"],"other_free_text":[]},"mechanistic_narrative":"ELMOD3 is an ELMO-domain-containing GTPase-activating protein that regulates actin cytoskeletal integrity in sensory hair cells and epithelial cells, vesicle trafficking from the Golgi to cilia, and signaling through ARF/ARL-family GTPases. Its ELMO domain catalyzes GTP hydrolysis on ARL2 in vitro, and this activity is essential for co-localization with F-actin in epithelial microvilli and hair-cell stereocilia; disease-associated mutations (e.g., p.Leu265Ser, p.His171Arg) abolish GAP activity, disrupt actin association, and accelerate protein degradation [PMID:24039609, PMID:29713870]. Knockout of Elmod3 in mice causes progressive sensorineural hearing loss with stereocilia shortening, fusion, and loss of F-actin, establishing ELMOD3 as essential for cochlear hair-cell maintenance [PMID:31628468]. ELMOD3 also promotes primary ciliogenesis by facilitating Golgi-to-cilia protein trafficking upstream of ARL3 and ARL16, and in gastric cancer cells it interacts with β-catenin via its ELMO domain to activate Wnt target gene expression and RAF/MEK/ERK signaling [PMID:34818063, PMID:39621020]."},"prefetch_data":{"uniprot":{"accession":"Q96FG2","full_name":"ELMO domain-containing protein 3","aliases":["RNA-binding motif and ELMO domain-containing protein 1","RNA-binding motif protein 29","RNA-binding protein 29"],"length_aa":381,"mass_kda":43.0,"function":"Acts as a GTPase-activating protein (GAP) for ARL2 with low specific activity","subcellular_location":"Cell projection, stereocilium; Cell projection, kinocilium; Cytoplasm, cytoskeleton","url":"https://www.uniprot.org/uniprotkb/Q96FG2/entry"},"depmap":{"release":"DepMap","has_data":true,"is_common_essential":false,"resolved_as":"","url":"https://depmap.org/portal/gene/ELMOD3","classification":"Not Classified","n_dependent_lines":66,"n_total_lines":1208,"dependency_fraction":0.054635761589403975},"opencell":{"profiled":false,"resolved_as":"","ensg_id":"","cell_line_id":"","localizations":[],"interactors":[],"url":"https://opencell.sf.czbiohub.org/search/ELMOD3","total_profiled":1310},"omim":[{"mim_id":"620951","title":"WD REPEAT-CONTAINING PROTEIN 31; WDR31","url":"https://www.omim.org/entry/620951"},{"mim_id":"619500","title":"DEAFNESS, AUTOSOMAL DOMINANT 81; DFNA81","url":"https://www.omim.org/entry/619500"},{"mim_id":"615429","title":"DEAFNESS, AUTOSOMAL RECESSIVE 88; DFNB88","url":"https://www.omim.org/entry/615429"},{"mim_id":"615427","title":"ELMO/CED12 DOMAIN-CONTAINING PROTEIN 3; ELMOD3","url":"https://www.omim.org/entry/615427"},{"mim_id":"601175","title":"ADP-RIBOSYLATION FACTOR-LIKE GTPase 2; ARL2","url":"https://www.omim.org/entry/601175"}],"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/ELMOD3"},"hgnc":{"alias_symbol":["FLJ21977"],"prev_symbol":["RBM29","RBED1","DFNB88"]},"alphafold":{"accession":"Q96FG2","domains":[{"cath_id":"-","chopping":"105-340","consensus_level":"high","plddt":96.2644,"start":105,"end":340}],"viewer_url":"https://alphafold.ebi.ac.uk/entry/Q96FG2","model_url":"https://alphafold.ebi.ac.uk/files/AF-Q96FG2-F1-model_v6.cif","pae_url":"https://alphafold.ebi.ac.uk/files/AF-Q96FG2-F1-predicted_aligned_error_v6.png","plddt_mean":75.81},"mouse_models":{"mgi_url":"https://www.informatics.jax.org/marker/summary?nomen=ELMOD3","jax_strain_url":"https://www.jax.org/strain/search?query=ELMOD3"},"sequence":{"accession":"Q96FG2","fasta_url":"https://rest.uniprot.org/uniprotkb/Q96FG2.fasta","uniprot_url":"https://www.uniprot.org/uniprotkb/Q96FG2/entry","alphafold_viewer_url":"https://alphafold.ebi.ac.uk/entry/Q96FG2"}},"corpus_meta":[{"pmid":"24039609","id":"PMC_24039609","title":"An alteration in ELMOD3, an Arl2 GTPase-activating protein, is associated with hearing impairment in humans.","date":"2013","source":"PLoS genetics","url":"https://pubmed.ncbi.nlm.nih.gov/24039609","citation_count":39,"is_preprint":false},{"pmid":"29713870","id":"PMC_29713870","title":"ELMOD3, a novel causative gene, associated with human autosomal dominant nonsyndromic and progressive hearing loss.","date":"2018","source":"Human genetics","url":"https://pubmed.ncbi.nlm.nih.gov/29713870","citation_count":18,"is_preprint":false},{"pmid":"31628468","id":"PMC_31628468","title":"Elmod3 knockout leads to progressive hearing loss and abnormalities in cochlear hair cell stereocilia.","date":"2019","source":"Human molecular genetics","url":"https://pubmed.ncbi.nlm.nih.gov/31628468","citation_count":14,"is_preprint":false},{"pmid":"31800155","id":"PMC_31800155","title":"ELMOD3-SH2D6 gene fusion as a possible co-star actor in autism spectrum disorder scenario.","date":"2019","source":"Journal of cellular and molecular medicine","url":"https://pubmed.ncbi.nlm.nih.gov/31800155","citation_count":12,"is_preprint":false},{"pmid":"30284680","id":"PMC_30284680","title":"Homozygous 2p11.2 deletion supports the implication of ELMOD3 in hearing loss and reveals the potential association of CAPG with ASD/ID etiology.","date":"2018","source":"Journal of applied genetics","url":"https://pubmed.ncbi.nlm.nih.gov/30284680","citation_count":11,"is_preprint":false},{"pmid":"34818063","id":"PMC_34818063","title":"The ARF GAPs ELMOD1 and ELMOD3 act at the Golgi and cilia to regulate ciliogenesis and ciliary protein traffic.","date":"2021","source":"Molecular biology of the cell","url":"https://pubmed.ncbi.nlm.nih.gov/34818063","citation_count":11,"is_preprint":false},{"pmid":"36918025","id":"PMC_36918025","title":"ELMOD3-Rab1A-Flotillin2 cascade regulates lumen formation via vesicle trafficking in Ciona notochord.","date":"2023","source":"Open biology","url":"https://pubmed.ncbi.nlm.nih.gov/36918025","citation_count":7,"is_preprint":false},{"pmid":"37708136","id":"PMC_37708136","title":"Gene regulation analysis of patient-derived iPSCs and its CRISPR-corrected control provides a new tool for studying perturbations of ELMOD3 c.512A>G mutation during the development of inherited hearing loss.","date":"2023","source":"PloS one","url":"https://pubmed.ncbi.nlm.nih.gov/37708136","citation_count":5,"is_preprint":false},{"pmid":"40297141","id":"PMC_40297141","title":"Case Report: A novel ELMOD3-ALK and EML4-ALK double-fusion responses to neoadjuvant alectinib in a lung adenocarcinoma patient.","date":"2025","source":"Frontiers in pharmacology","url":"https://pubmed.ncbi.nlm.nih.gov/40297141","citation_count":1,"is_preprint":false},{"pmid":"39621020","id":"PMC_39621020","title":"Depletion of ELMOD3 inhibits the growth and migration of gastric cancer cells by disrupting the β-catenin signaling and the F-actin cytoskeleton.","date":"2024","source":"FASEB journal : official publication of the Federation of American Societies for Experimental Biology","url":"https://pubmed.ncbi.nlm.nih.gov/39621020","citation_count":0,"is_preprint":false},{"pmid":null,"id":"bio_10.1101_2025.02.11.25321773","title":"Confirmatory insights into<i>ELMOD3</i>-associated autosomal dominant non-syndromic hearing loss","date":"2025-02-14","source":"bioRxiv","url":"https://doi.org/10.1101/2025.02.11.25321773","citation_count":0,"is_preprint":true}],"cost":{"stage1":{"model":"claude-sonnet-4-6","input_tokens":6414,"output_tokens":2077,"usd":0.025198},"stage2":{"model":"claude-opus-4-6","input_tokens":5392,"output_tokens":2150,"usd":0.121065},"total_usd":0.146263,"stage1_batch_id":"msgbatch_0118RScg3WGaGkaZRtWZbtce","stage2_batch_id":"msgbatch_01Cpfzvtbj42aqp5oYZ5Te2s","note":"batch pricing = 50% of standard"},"stage1_raw":"```json\n{\n  \"discoveries\": [\n    {\n      \"year\": 2013,\n      \"finding\": \"Recombinant human GST-ELMOD3 exhibits GTPase-activating protein (GAP) activity against the Arl2 GTPase in vitro; this activity is completely abolished by the p.Leu265Ser mutation in the ELMO domain.\",\n      \"method\": \"In vitro GAP assay with recombinant GST-ELMOD3; active-site mutagenesis (p.Leu265Ser)\",\n      \"journal\": \"PLoS genetics\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 — direct in vitro biochemical reconstitution with mutagenesis confirmation\",\n      \"pmids\": [\"24039609\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2013,\n      \"finding\": \"ELMOD3 co-localizes with the actin cytoskeleton in MDCK cells and with actin-based microvilli of LLC-PK1-CL4 epithelial cells; the p.Leu265Ser ELMO-domain mutation impairs this co-localization, linking the ELMO domain to actin association.\",\n      \"method\": \"Fluorescence co-localization of tagged ELMOD3 with actin in cell lines; super-resolution imaging; mutant comparison\",\n      \"journal\": \"PLoS genetics\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 — direct localization experiment with functional consequence demonstrated by disease mutation\",\n      \"pmids\": [\"24039609\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2013,\n      \"finding\": \"In rodent inner ear sensory epithelia, ELMOD3 is most prominently expressed in the stereocilia of cochlear hair cells.\",\n      \"method\": \"Immunofluorescence/localization in cochlear tissue sections\",\n      \"journal\": \"PLoS genetics\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 — direct localization experiment in native tissue, single lab\",\n      \"pmids\": [\"24039609\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2018,\n      \"finding\": \"The p.His171Arg mutation in ELMOD3 results in abnormal subcellular localization and faster protein decay (shorter half-life) compared to wild-type ELMOD3.\",\n      \"method\": \"Immunofluorescence staining; Western blot protein stability/degradation assay in cell lines\",\n      \"journal\": \"Human genetics\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 — two orthogonal methods (localization + stability) in a single lab\",\n      \"pmids\": [\"29713870\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2019,\n      \"finding\": \"Knockout of Elmod3 in mice (CRISPR/Cas9) causes progressive hearing loss accompanied by shortening and fusion of inner hair cell stereocilia, progressive degeneration of outer hair cell stereocilia, and markedly reduced F-actin cytoskeleton expression in the cochlea, demonstrating ELMOD3's role in maintaining actin dynamics in cochlear hair cells.\",\n      \"method\": \"CRISPR/Cas9 Elmod3 knockout mouse; auditory brainstem response; confocal imaging of F-actin and stereocilia morphology\",\n      \"journal\": \"Human molecular genetics\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 — clean KO with defined cellular phenotype (stereocilia morphology + actin) using multiple readouts\",\n      \"pmids\": [\"31628468\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2021,\n      \"finding\": \"ELMOD3 (along with ELMOD1) acts at the Golgi and at cilia to regulate ciliogenesis; deletion of Elmod3 in mouse embryonic fibroblasts impairs primary cilia formation, causes loss of a subset of ciliary proteins, and results in accumulation of ciliary proteins at the Golgi, consistent with a role in Golgi-to-cilia trafficking. These phenotypes are reversed by expression of activating mutants of ARL3 or ARL16, placing ELMOD3 upstream of these ARF-family GTPases.\",\n      \"method\": \"Elmod3 deletion MEF lines; immunofluorescence of cilia and Golgi markers; epistasis with constitutively active ARL3/ARL16 mutants\",\n      \"journal\": \"Molecular biology of the cell\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 — genetic epistasis with activating mutants and multiple cellular readouts in a clean KO background\",\n      \"pmids\": [\"34818063\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2023,\n      \"finding\": \"In Ciona notochord, ELMOD3 physically interacts with Rab1A and with lipid-raft protein Flotillin2, regulating Flotillin2 subcellular localization; ELMOD3 functions upstream in a cascade (ELMOD3→Rab1A→Flotillin2) that drives vesicle trafficking from cytoplasm to the apical membrane required for lumen formation.\",\n      \"method\": \"Co-IP/pulldown interaction assays; loss-of-function (morpholino/mutant) rescue experiments; subcellular localization imaging in Ciona notochord\",\n      \"journal\": \"Open biology\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2/3 — interaction + epistasis in a non-mammalian deuterostome model, single lab\",\n      \"pmids\": [\"36918025\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2024,\n      \"finding\": \"The ELMO domain of ELMOD3 directly interacts with β-catenin in gastric cancer cells, increasing β-catenin levels and promoting downstream Wnt target gene expression; ELMOD3 knockout decreases β-catenin signaling, elevates E-cadherin, suppresses RAF/MEK/ERK signaling, and disrupts F-actin cytoskeleton formation.\",\n      \"method\": \"Co-IP (ELMO domain interaction with β-catenin); ELMOD3 knockout cells; xenograft tumor model; Western blot pathway analysis\",\n      \"journal\": \"FASEB journal\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2/3 — Co-IP for interaction plus KO with multiple pathway readouts, single lab\",\n      \"pmids\": [\"39621020\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2025,\n      \"finding\": \"The p.Gly214Ser ELMOD3 mutation causes rapid protein degradation and impairs co-localization with F-actin; molecular modeling indicates the substitution introduces steric clashes with adjacent residues Ala160 and Cys162, disrupting protein stability.\",\n      \"method\": \"Protein stability assay; fluorescence co-localization with F-actin; molecular modeling/structural analysis\",\n      \"journal\": \"bioRxiv (preprint)\",\n      \"confidence\": \"Low\",\n      \"confidence_rationale\": \"Tier 3 — single lab, preprint, modeling plus cell-based assays without in vitro reconstitution\",\n      \"pmids\": [\"bio_10.1101_2025.02.11.25321773\"],\n      \"is_preprint\": true\n    }\n  ],\n  \"current_model\": \"ELMOD3 is an ARF/ARL-family GTPase-activating protein (GAP) whose ELMO domain catalyzes GTP hydrolysis on ARL2 (and related ARL GTPases), associates with the actin cytoskeleton in hair-cell stereocilia and epithelial microvilli, acts at the Golgi and cilia to regulate Golgi-to-cilia vesicle trafficking (upstream of ARL3/ARL16), and in gastric cancer cells interacts with β-catenin to modulate Wnt and RAF/MEK/ERK signaling; loss of ELMOD3 function disrupts stereocilia actin dynamics causing progressive sensorineural deafness.\"\n}\n```","stage2_raw":"```json\n{\n  \"mechanistic_narrative\": \"ELMOD3 is an ELMO-domain-containing GTPase-activating protein that regulates actin cytoskeletal integrity in sensory hair cells and epithelial cells, vesicle trafficking from the Golgi to cilia, and signaling through ARF/ARL-family GTPases. Its ELMO domain catalyzes GTP hydrolysis on ARL2 in vitro, and this activity is essential for co-localization with F-actin in epithelial microvilli and hair-cell stereocilia; disease-associated mutations (e.g., p.Leu265Ser, p.His171Arg) abolish GAP activity, disrupt actin association, and accelerate protein degradation [PMID:24039609, PMID:29713870]. Knockout of Elmod3 in mice causes progressive sensorineural hearing loss with stereocilia shortening, fusion, and loss of F-actin, establishing ELMOD3 as essential for cochlear hair-cell maintenance [PMID:31628468]. ELMOD3 also promotes primary ciliogenesis by facilitating Golgi-to-cilia protein trafficking upstream of ARL3 and ARL16, and in gastric cancer cells it interacts with β-catenin via its ELMO domain to activate Wnt target gene expression and RAF/MEK/ERK signaling [PMID:34818063, PMID:39621020].\",\n  \"teleology\": [\n    {\n      \"year\": 2013,\n      \"claim\": \"Establishing the enzymatic identity of ELMOD3 as an ARL2 GAP and linking its ELMO domain to actin association resolved the question of what molecular activity the protein provides and where it acts in cells.\",\n      \"evidence\": \"In vitro GAP assay with recombinant GST-ELMOD3, mutagenesis of p.Leu265Ser, and fluorescence co-localization with actin in MDCK and LLC-PK1-CL4 cells; immunofluorescence in rodent cochlea\",\n      \"pmids\": [\"24039609\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\n        \"No structure of the ELMO domain bound to ARL2 is available\",\n        \"Substrate selectivity across the broader ARF/ARL family was not tested\",\n        \"Mechanism by which GAP activity promotes actin co-localization is unclear\"\n      ]\n    },\n    {\n      \"year\": 2018,\n      \"claim\": \"Demonstrating that the p.His171Arg mutation destabilizes ELMOD3 protein and mislocalizes it provided a second independent disease-associated mechanism (protein instability) beyond catalytic loss.\",\n      \"evidence\": \"Immunofluorescence and Western blot protein decay assays comparing wild-type and p.His171Arg ELMOD3 in cell lines\",\n      \"pmids\": [\"29713870\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\n        \"Degradation pathway (proteasomal vs. lysosomal) not identified\",\n        \"Whether reduced protein levels alone explain pathogenicity or whether mislocalization contributes independently is unresolved\"\n      ]\n    },\n    {\n      \"year\": 2019,\n      \"claim\": \"Elmod3 knockout mice established that ELMOD3 is required in vivo for maintaining stereocilia actin architecture and hearing, converting the gene from a candidate to a validated deafness gene.\",\n      \"evidence\": \"CRISPR/Cas9 Elmod3 knockout mouse; auditory brainstem response; confocal imaging of stereocilia morphology and F-actin\",\n      \"pmids\": [\"31628468\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\n        \"Whether ELMOD3 acts cell-autonomously in hair cells versus supporting cells was not tested\",\n        \"Direct ARL2-dependent step in stereocilia maintenance not demonstrated in vivo\",\n        \"Rescue with wild-type ELMOD3 was not shown\"\n      ]\n    },\n    {\n      \"year\": 2021,\n      \"claim\": \"Deletion of Elmod3 in MEFs revealed a second major cellular function—regulation of Golgi-to-cilia vesicle trafficking—and epistasis with constitutively active ARL3/ARL16 placed ELMOD3 upstream in a GTPase signaling cascade controlling ciliogenesis.\",\n      \"evidence\": \"Elmod3-deleted MEFs; immunofluorescence of cilia and Golgi markers; rescue by activating ARL3 and ARL16 mutants\",\n      \"pmids\": [\"34818063\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\n        \"Direct GAP activity of ELMOD3 toward ARL3 or ARL16 was not biochemically tested\",\n        \"Whether the cilia phenotype contributes to the hearing loss in Elmod3 KO mice is unknown\",\n        \"Cargo identity in the Golgi-to-cilia trafficking pathway is not defined\"\n      ]\n    },\n    {\n      \"year\": 2023,\n      \"claim\": \"ELMOD3 was shown to interact with Rab1A and Flotillin2 and to regulate apical membrane vesicle trafficking in Ciona notochord, extending its vesicle trafficking role to a non-mammalian system and revealing new physical partners.\",\n      \"evidence\": \"Co-IP/pulldown assays and loss-of-function/rescue experiments in Ciona notochord\",\n      \"pmids\": [\"36918025\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\n        \"Whether the ELMOD3–Rab1A interaction is conserved in mammals is untested\",\n        \"Whether ELMOD3 acts as a GAP for Rab1A or functions through a non-catalytic mechanism is unknown\",\n        \"Single invertebrate model system; awaits independent replication\"\n      ]\n    },\n    {\n      \"year\": 2024,\n      \"claim\": \"Discovery that ELMOD3's ELMO domain directly binds β-catenin to potentiate Wnt and RAF/MEK/ERK signaling in gastric cancer cells opened an unexpected oncogenic signaling role distinct from its GTPase and actin functions.\",\n      \"evidence\": \"Co-IP of ELMO domain with β-catenin; ELMOD3 knockout gastric cancer cells; xenograft model; Western blot pathway analysis\",\n      \"pmids\": [\"39621020\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\n        \"Whether β-catenin interaction depends on ELMOD3 GAP activity is untested\",\n        \"Single cancer type examined; generalizability unknown\",\n        \"Mechanism linking ELMOD3 to RAF/MEK/ERK (direct vs. β-catenin-mediated) is unresolved\"\n      ]\n    },\n    {\n      \"year\": null,\n      \"claim\": \"The structural basis of ELMO-domain substrate recognition, the full spectrum of GTPase targets, and whether the ciliary, actin, and Wnt/ERK functions are mechanistically coupled or independent remain unresolved.\",\n      \"evidence\": \"\",\n      \"pmids\": [],\n      \"confidence\": \"High\",\n      \"gaps\": [\n        \"No crystal or cryo-EM structure of ELMOD3 alone or in complex with any GTPase\",\n        \"Systematic GAP activity profiling across ARF/ARL/Rab family members has not been performed\",\n        \"Whether the ciliogenesis defect and the stereocilia/actin defect share a common trafficking mechanism is unknown\"\n      ]\n    }\n  ],\n  \"mechanism_profile\": {\n    \"molecular_activity\": [\n      {\"term_id\": \"GO:0098772\", \"supporting_discovery_ids\": [0, 5]},\n      {\"term_id\": \"GO:0008092\", \"supporting_discovery_ids\": [1, 4]}\n    ],\n    \"localization\": [\n      {\"term_id\": \"GO:0005856\", \"supporting_discovery_ids\": [1, 4]},\n      {\"term_id\": \"GO:0005794\", \"supporting_discovery_ids\": [5]},\n      {\"term_id\": \"GO:0005929\", \"supporting_discovery_ids\": [5]}\n    ],\n    \"pathway\": [\n      {\"term_id\": \"R-HSA-5653656\", \"supporting_discovery_ids\": [5, 6]},\n      {\"term_id\": \"R-HSA-162582\", \"supporting_discovery_ids\": [5, 7]}\n    ],\n    \"complexes\": [],\n    \"partners\": [\n      \"ARL2\",\n      \"ARL3\",\n      \"ARL16\",\n      \"CTNNB1\",\n      \"RAB1A\",\n      \"FLOT2\"\n    ],\n    \"other_free_text\": []\n  }\n}\n```"}