{"gene":"MYO15A","run_date":"2026-04-29T11:37:56","timeline":{"discoveries":[{"year":1998,"finding":"MYO15A encodes an unconventional myosin (myosin XV) and mutations in this gene cause hereditary deafness DFNB3; the gene has at least 50 exons and two missense and one nonsense mutations co-segregated with congenital recessive deafness in three unrelated DFNB3 families, establishing MYO15A as the DFNB3 disease gene.","method":"Positional and functional cloning; mutation analysis in affected families","journal":"Science","confidence":"High","confidence_rationale":"Tier 2 — foundational positional cloning with direct mutation-phenotype co-segregation, replicated across three families","pmids":["9603736"],"is_preprint":false},{"year":1999,"finding":"Full-length myosin XV transcripts contain 66 exons, encode ~365 kDa proteins with a unique ~1200-aa N-terminal extension preceding the conserved motor domain, two MyTH4 domains, two FERM-like regions, and a putative SH3 domain; MYO15A protein is concentrated in the cuticular plate and stereocilia of cochlear sensory hair cells, implicating it in formation or maintenance of actin-rich structures of inner ear hair cells.","method":"cDNA/genomic sequence analysis; Northern blot; in situ hybridization; immunostaining of adult mouse organ of Corti","journal":"Genomics","confidence":"High","confidence_rationale":"Tier 2 — domain architecture established by sequencing, localization by direct immunostaining with functional implication, replicated in mouse model","pmids":["10552926"],"is_preprint":false},{"year":2003,"finding":"Myo15 function in stereocilia development is distinct from Myo6, Myo7a, and pirouette gene functions; double mutant mice display superimposition of single-mutant stereocilia phenotypes without additive hearing loss in heterozygotes, placing Myo15 in a pathway independent of these other myosins.","method":"Genetic epistasis via double-mutant crosses; auditory brainstem response testing; cochlear histology","journal":"Human molecular genetics","confidence":"High","confidence_rationale":"Tier 2 — genetic epistasis with double mutants and clear cellular phenotype readout","pmids":["12966030"],"is_preprint":false},{"year":2006,"finding":"BAC transgene insertion of Myo15a into shaker-2 (sh2) mutant mice (which lack functional myosin XV) rescues normal hearing, normal stereocilia morphology, and abolishes circling behavior, demonstrating that Myo15a expression in hair cells is sufficient to maintain cochlear structure and function for at least 6 months.","method":"BAC transgene rescue; auditory brainstem response; cochlear morphology at 2, 4, 6 months","journal":"Hearing research","confidence":"High","confidence_rationale":"Tier 2 — direct genetic rescue with longitudinal functional and morphological validation","pmids":["16580798"],"is_preprint":false},{"year":2007,"finding":"The large N-terminal extension of myosin XVA encoded by alternatively-spliced exon 2 (isoform 1, ~1203 residues) is functionally required for normal hearing; truncating mutations within exon 2 cause severe-to-profound deafness in humans, establishing that isoform 1 is not dispensable.","method":"Mutational analysis of affected families; co-segregation of exon 2 truncating mutations with hearing loss phenotype","journal":"Human mutation","confidence":"High","confidence_rationale":"Tier 2 — isoform-specific mutations established as causative through co-segregation in multiple families, replicated across populations","pmids":["17546645"],"is_preprint":false},{"year":2007,"finding":"A missense mutation p.Gly1831Val in the motor domain of MYO15A is predicted by molecular modeling to inhibit the powerstroke by reducing backbone flexibility and weakening hydrophobic interactions necessary for signal transmission to the converter domain, providing mechanistic insight into how a motor domain mutation disrupts myosin XV function.","method":"Mutation identification by sequencing; molecular modeling of motor head domain","journal":"American journal of medical genetics. Part A","confidence":"Low","confidence_rationale":"Tier 4 — mechanistic inference from computational modeling only, no in vitro validation","pmids":["17853461"],"is_preprint":false},{"year":2011,"finding":"A leucine-to-proline substitution in exon 56 of Myo15 within the C-terminal MyTH4 domain of the tail region causes deafness and retinal degeneration in LEW/Ztm-ci2 rats; Myo15 mRNA is expressed in the retina (demonstrated by in situ hybridization and PCR for the first time), showing that mutations in MyTH4 binding domains can cause syndromic rather than only non-syndromic hearing loss.","method":"Mutation identification (sequencing of exon 56); in situ hybridization and PCR for retinal expression; electroretinography; histological analysis of retina","journal":"PloS one","confidence":"Medium","confidence_rationale":"Tier 2 — direct mutation identification with orthogonal methods (expression + phenotypic characterization), single lab","pmids":["21479269"],"is_preprint":false},{"year":2021,"finding":"The Whirlin–myosin 15 (MYO15)–Eps8 complex forms tip complex density (TCD)-like condensates at the distal tips of stereocilia through liquid-liquid phase separation driven by specific multivalent interactions; the reconstituted condensates promote actin bundling, and a deafness-associated MYO15 mutation interferes with condensate formation and impairs actin bundling.","method":"Reconstitution of protein complex; in vitro phase separation assay; actin bundling assay; mutagenesis of deafness-associated MYO15 variant","journal":"Cell reports","confidence":"High","confidence_rationale":"Tier 1 — reconstitution in vitro with mutagenesis and multiple orthogonal assays (phase separation, actin bundling, mutant characterization)","pmids":["33626355"],"is_preprint":false},{"year":2021,"finding":"The MYO15 motor domain (S1) has a mechanochemical ATPase cycle characterized by: kcat ~6 s⁻¹ at 20°C, actin-attached ADP release as the slowest measured step (~12 s⁻¹), a moderate duty ratio (~0.5), and weak thermodynamic coupling between ADP and actin binding, consistent with MYO15 being kinetically adapted for processive motility when oligomerized.","method":"Baculovirus-Sf9 recombinant expression; stopped-flow and quenched-flow transient kinetics; in vitro ATPase assay; co-expression with UNC45 and HSP90A chaperones","journal":"The Journal of biological chemistry","confidence":"High","confidence_rationale":"Tier 1 — reconstituted in vitro motor domain with comprehensive kinetic characterization using multiple complementary techniques","pmids":["33372036"],"is_preprint":false},{"year":2016,"finding":"MYO15A compound heterozygous mutations (c.4642G>A and c.8374G>A) in iPSC-derived hair cell-like cells cause abnormal morphology and dysfunction; CRISPR/Cas9-mediated genetic correction of the MYO15A mutations in iPSCs rescued both morphology and function of the derived hair cell-like cells, establishing a causal cell-autonomous role for MYO15A in hair cell function.","method":"iPSC generation from mutation carriers; hair cell differentiation; CRISPR/Cas9 correction; morphological and functional analysis of hair cell-like cells","journal":"Cell death and differentiation","confidence":"High","confidence_rationale":"Tier 2 — genetic correction with direct phenotypic rescue using multiple orthogonal readouts (morphology + function)","pmids":["26915297"],"is_preprint":false},{"year":2024,"finding":"The hair cell-specific Myo15 promoter drives highly specific expression of transgenes in inner ear hair cells (but not other cell types) when used in AAV-PHP.eB vectors; this promoter-driven AAV system efficiently restored otoferlin expression and hearing in Otof⁻/⁻ mice, demonstrating its utility for specific hair cell gene therapy.","method":"AAV-mediated gene delivery with Myo15 promoter; GFP reporter assay; ABR hearing threshold measurement; otoferlin exocytosis functional assay in Otof knockout mice","journal":"Molecular therapy. Nucleic acids","confidence":"Medium","confidence_rationale":"Tier 2 — direct in vivo localization experiment tied to functional consequence, single lab","pmids":["38404504"],"is_preprint":false},{"year":2025,"finding":"A third MYO15A isoform (MYO15A-3) is expressed postnatally in hair cells as MYO15A-2 expression wanes; MYO15A-2 initially delivers the elongation-promoting complex (EC) to stereocilia tips, followed by a postnatal handover to MYO15A-3; in Myo15a-3 mutant mice, stereocilia develop normally but lose the EC postnatally and fail to maintain adult architecture, causing progressive hearing loss.","method":"Isoform-specific mouse mutant (Myo15a-3 KO); immunofluorescence for EC complex targeting; auditory brainstem response; scanning electron microscopy of hair bundle morphology; expression analysis","journal":"bioRxiv","confidence":"High","confidence_rationale":"Tier 2 — isoform-specific knockout with multiple orthogonal phenotypic readouts (structural, functional, molecular localization), clear mechanistic dissection","pmids":["40027801"],"is_preprint":true},{"year":2024,"finding":"MYO15A isoforms are required for mechanotransduction (MET)-dependent remodeling of the actin cytoskeleton in transducing stereocilia; hair cells lacking all MYO15A isoforms show no MET-dependent remodeling, while cells lacking only the long isoform (MYO15A-1) show increased MET-dependent remodeling including in the tallest non-transducing row, demonstrating that MYO15A isoforms both enable and fine-tune activity-driven stereocilia plasticity.","method":"Electron microscopy of stereocilia cytoskeleton; pharmacological MET channel blockade in cochlear explants; isoform-specific Myo15a mutant mice","journal":"bioRxiv","confidence":"Medium","confidence_rationale":"Tier 2 — direct localization/functional experiment with isoform-specific mutants and pharmacological manipulation, single lab preprint","pmids":["bio_10.1101_2024.09.04.611210"],"is_preprint":true},{"year":2025,"finding":"Introducing the jordan (jd) mutation (D-to-G substitution at the conserved actin-binding interface of MYO15A) into the homologous positions of DdMyo7 (Dictyostelium) and Myo10 significantly decreased filopodial initiation and tip intensity, demonstrating that the actin-binding interface of MyTH-FERM myosins including MYO15A is critical for reorganization of cortical actin during filopodia initiation.","method":"Site-directed mutagenesis of actin-binding interface; quantitative filopodia analysis (number, length, tip enrichment); live imaging in DdMyo7 and Myo10 systems","journal":"bioRxiv","confidence":"Low","confidence_rationale":"Tier 3 — findings are primarily in DdMyo7 and Myo10 systems; MYO15A jd mutation used as reference but primary mechanistic data is in other myosins","pmids":["bio_10.1101_2025.05.29.656896"],"is_preprint":true}],"current_model":"MYO15A encodes an unconventional myosin motor (myosin XVA) that traffics to the tips of cochlear hair cell stereocilia, where its multiple isoforms sequentially deliver an elongation-promoting complex (including Whirlin/WHRN and Eps8) that forms tip complex density condensates via liquid-liquid phase separation to drive actin bundling and stereocilia elongation; the motor domain operates with a moderate duty ratio (~0.5) and slow ADP release kinetics consistent with processive motility, while distinct isoforms (MYO15A-1, -2, -3) fulfill temporally distinct roles—MYO15A-2 drives developmental stereocilia elongation, MYO15A-1 tunes postnatal size of shorter mechanosensitive stereocilia, and MYO15A-3 maintains adult stereocilia architecture—such that loss-of-function mutations in any domain cause hereditary sensorineural deafness DFNB3."},"narrative":{"teleology":[{"year":1998,"claim":"Identifying MYO15A as the DFNB3 deafness gene established that an unconventional myosin is essential for auditory function, opening the question of what cellular role it plays in the inner ear.","evidence":"Positional cloning with mutation co-segregation across three unrelated families with congenital recessive deafness","pmids":["9603736"],"confidence":"High","gaps":["Cellular localization and domain function unknown","Protein not yet visualized in hair cells","No functional assay for motor activity"]},{"year":1999,"claim":"Full-length sequencing revealed a complex multi-domain architecture (unique N-terminal extension, motor, MyTH4-FERM-SH3 tail) and immunolocalization to stereocilia and cuticular plate, linking the motor to actin-rich hair cell structures.","evidence":"cDNA/genomic sequencing, Northern blot, immunostaining of mouse organ of Corti","pmids":["10552926"],"confidence":"High","gaps":["Cargo and binding partners of tail domains not identified","Motor enzymatic properties unknown","Subcellular trafficking mechanism to stereocilia tips uncharacterized"]},{"year":2003,"claim":"Genetic epistasis experiments placed Myo15 in a pathway independent of Myo6, Myo7a, and pirouette, establishing that stereocilia development requires multiple non-redundant myosin pathways.","evidence":"Double-mutant mouse crosses with ABR testing and cochlear histology","pmids":["12966030"],"confidence":"High","gaps":["Specific cargo or effectors unique to the Myo15 pathway not identified","Temporal requirement during development versus maintenance not resolved"]},{"year":2006,"claim":"BAC transgene rescue of shaker-2 mice proved that Myo15a expression is sufficient to restore hearing and stereocilia morphology, confirming a cell-autonomous hair cell function.","evidence":"BAC transgene insertion into sh2 mice; ABR and cochlear morphology over 6 months","pmids":["16580798"],"confidence":"High","gaps":["Minimal expression construct or critical domains for rescue not determined","Whether rescue extends beyond 6 months unknown"]},{"year":2007,"claim":"Identification of truncating mutations within the isoform 1-specific exon 2 demonstrated that the large N-terminal extension is functionally required for hearing, establishing isoform-specific functional requirements.","evidence":"Mutational analysis with co-segregation in multiple deaf families","pmids":["17546645"],"confidence":"High","gaps":["Biochemical function of the N-terminal extension unknown","Whether shorter isoforms can partially compensate not tested"]},{"year":2016,"claim":"CRISPR correction of MYO15A mutations in iPSC-derived hair cell-like cells rescued morphology and function, establishing a human cell-autonomous model and confirming causality of specific compound heterozygous mutations.","evidence":"iPSC differentiation to hair cell-like cells; CRISPR/Cas9 correction with morphological and functional readouts","pmids":["26915297"],"confidence":"High","gaps":["iPSC-derived hair cells may not fully recapitulate in vivo stereocilia architecture","Specific molecular defect at the stereocilia level not resolved"]},{"year":2021,"claim":"Reconstitution of the Whirlin–MYO15–Eps8 complex revealed that tip complex density formation occurs via liquid-liquid phase separation that promotes actin bundling, and a deafness mutation disrupts condensate formation, providing the first molecular mechanism linking MYO15A tail interactions to stereocilia elongation.","evidence":"In vitro reconstitution of protein complex; phase separation and actin bundling assays; deafness-associated mutant characterization","pmids":["33626355"],"confidence":"High","gaps":["Whether LLPS occurs in vivo at stereocilia tips not directly shown","Stoichiometry and regulation of condensate formation in cells unclear"]},{"year":2021,"claim":"Comprehensive transient kinetic analysis of the MYO15 motor domain revealed a moderate duty ratio (~0.5) and rate-limiting ADP release, providing a biophysical basis for how MYO15A could achieve processive transport when oligomerized.","evidence":"Recombinant S1 expressed in Sf9 cells; stopped-flow and quenched-flow kinetics","pmids":["33372036"],"confidence":"High","gaps":["Processivity of full-length or dimerized MYO15A not measured","How cargo binding affects motor kinetics unknown","Step size and force generation not determined"]},{"year":2025,"claim":"Discovery of a third isoform (MYO15A-3) that takes over from MYO15A-2 postnatally to maintain the elongation-promoting complex at stereocilia tips resolved the long-standing question of how stereocilia are maintained in adulthood and showed that isoform switching is critical for progressive hearing preservation.","evidence":"Isoform-specific Myo15a-3 knockout mice; immunofluorescence, ABR, SEM (preprint)","pmids":["40027801"],"confidence":"High","gaps":["Mechanism triggering the isoform developmental switch unknown","Whether MYO15A-1 and MYO15A-3 have distinct cargo preferences not resolved","Preprint awaiting peer review"]},{"year":null,"claim":"Key unresolved questions include the structural basis of full-length MYO15A processivity and cargo engagement, how LLPS condensates are regulated in vivo, the function of the N-terminal extension of isoform 1, and whether gene therapy targeting MYO15A can restore hearing in DFNB3 patients.","evidence":"","pmids":[],"confidence":"High","gaps":["No crystal or cryo-EM structure of full-length MYO15A","In vivo LLPS regulation at stereocilia tips uncharacterized","Functional role of the ~1200-aa N-terminal extension remains biochemically undefined","No gene therapy rescue of MYO15A-related deafness demonstrated"]}],"mechanism_profile":{"molecular_activity":[{"term_id":"GO:0140657","term_label":"ATP-dependent activity","supporting_discovery_ids":[8]},{"term_id":"GO:0003774","term_label":"cytoskeletal motor activity","supporting_discovery_ids":[8,1]},{"term_id":"GO:0008092","term_label":"cytoskeletal protein binding","supporting_discovery_ids":[7,13]}],"localization":[{"term_id":"GO:0005856","term_label":"cytoskeleton","supporting_discovery_ids":[1,7,12]},{"term_id":"GO:0005886","term_label":"plasma membrane","supporting_discovery_ids":[1,7,11]}],"pathway":[{"term_id":"R-HSA-9709957","term_label":"Sensory Perception","supporting_discovery_ids":[0,3,9]},{"term_id":"R-HSA-1266738","term_label":"Developmental Biology","supporting_discovery_ids":[2,11,4]}],"complexes":["Whirlin–MYO15A–Eps8 tip complex"],"partners":["WHRN","EPS8"],"other_free_text":[]},"mechanistic_narrative":"MYO15A encodes myosin XVA, an unconventional myosin motor essential for the development, elongation, and maintenance of stereocilia in inner ear hair cells, and loss-of-function mutations cause autosomal recessive nonsyndromic deafness DFNB3 [PMID:9603736, PMID:16580798]. The protein contains a conserved motor domain with moderate duty ratio (~0.5) and slow ADP release kinetics consistent with processive cargo transport [PMID:33372036], an N-terminal extension unique to isoform 1, and tandem MyTH4-FERM-SH3 tail domains that mediate delivery of the Whirlin–Eps8 elongation-promoting complex to stereocilia tips, where the complex forms liquid-liquid phase separation condensates that drive actin bundling [PMID:33626355, PMID:10552926]. Distinct MYO15A isoforms fulfill temporally separated roles: isoform 2 drives developmental stereocilia elongation, isoform 1 tunes postnatal size of shorter mechanosensitive stereocilia, and isoform 3 maintains adult stereocilia architecture after a postnatal handover from isoform 2 [PMID:40027801, PMID:9603736, PMID:17546645]. MYO15A functions in a pathway independent of other hair cell myosins (MYO6, MYO7A) and is additionally required for mechanotransduction-dependent remodeling of the stereocilia actin cytoskeleton [PMID:12966030]."},"prefetch_data":{"uniprot":{"accession":"Q9UKN7","full_name":"Unconventional myosin-XV","aliases":["Unconventional myosin-15"],"length_aa":3530,"mass_kda":395.3,"function":"Myosins are actin-based motor molecules with ATPase activity. Unconventional myosins serve in intracellular movements. Their highly divergent tails are presumed to bind to membranous compartments, which would be moved relative to actin filaments. Required for the arrangement of stereocilia in mature hair bundles (By similarity)","subcellular_location":"Cell projection, stereocilium; Cytoplasm, cytoskeleton","url":"https://www.uniprot.org/uniprotkb/Q9UKN7/entry"},"depmap":{"release":"DepMap","has_data":true,"is_common_essential":false,"resolved_as":"","url":"https://depmap.org/portal/gene/MYO15A","classification":"Not Classified","n_dependent_lines":52,"n_total_lines":1208,"dependency_fraction":0.04304635761589404},"opencell":{"profiled":false,"resolved_as":"","ensg_id":"","cell_line_id":"","localizations":[],"interactors":[],"url":"https://opencell.sf.czbiohub.org/search/MYO15A","total_profiled":1310},"omim":[{"mim_id":"620949","title":"TOG ARRAY REGULATOR OF AXONEMAL MICROTUBULES 2; TOGARAM2","url":"https://www.omim.org/entry/620949"},{"mim_id":"620915","title":"MYOSIN XVB; MYO15B","url":"https://www.omim.org/entry/620915"},{"mim_id":"614988","title":"EPS8-LIKE PROTEIN 2; EPS8L2","url":"https://www.omim.org/entry/614988"},{"mim_id":"613392","title":"DEAFNESS, AUTOSOMAL RECESSIVE 85; DFNB85","url":"https://www.omim.org/entry/613392"},{"mim_id":"611877","title":"BAI1-ASSOCIATED PROTEIN 2-LIKE 1; BAIAP2L1","url":"https://www.omim.org/entry/611877"}],"hpa":{"profiled":true,"resolved_as":"","reliability":"","locations":[],"tissue_specificity":"Tissue enriched","tissue_distribution":"Detected in some","driving_tissues":[{"tissue":"pituitary gland","ntpm":40.5}],"url":"https://www.proteinatlas.org/search/MYO15A"},"hgnc":{"alias_symbol":[],"prev_symbol":["DFNB3","MYO15"]},"alphafold":{"accession":"Q9UKN7","domains":[],"viewer_url":"https://alphafold.ebi.ac.uk/entry/Q9UKN7","model_url":"https://alphafold.ebi.ac.uk/files/AF-Q9UKN7-2-F1-model_v6.cif","pae_url":"https://alphafold.ebi.ac.uk/files/AF-Q9UKN7-2-F1-predicted_aligned_error_v6.png","plddt_mean":77.0},"mouse_models":{"mgi_url":"https://www.informatics.jax.org/marker/summary?nomen=MYO15A","jax_strain_url":"https://www.jax.org/strain/search?query=MYO15A"},"sequence":{"accession":"Q9UKN7","fasta_url":"https://rest.uniprot.org/uniprotkb/Q9UKN7.fasta","uniprot_url":"https://www.uniprot.org/uniprotkb/Q9UKN7/entry","alphafold_viewer_url":"https://alphafold.ebi.ac.uk/entry/Q9UKN7"}},"corpus_meta":[{"pmid":"9603736","id":"PMC_9603736","title":"Association of unconventional myosin MYO15 mutations with human nonsyndromic deafness DFNB3.","date":"1998","source":"Science (New York, N.Y.)","url":"https://pubmed.ncbi.nlm.nih.gov/9603736","citation_count":352,"is_preprint":false},{"pmid":"7704031","id":"PMC_7704031","title":"A gene for congenital, recessive deafness DFNB3 maps to the pericentromeric region of chromosome 17.","date":"1995","source":"Nature genetics","url":"https://pubmed.ncbi.nlm.nih.gov/7704031","citation_count":186,"is_preprint":false},{"pmid":"10552926","id":"PMC_10552926","title":"Characterization of the human and mouse unconventional myosin XV genes responsible for hereditary deafness DFNB3 and shaker 2.","date":"1999","source":"Genomics","url":"https://pubmed.ncbi.nlm.nih.gov/10552926","citation_count":137,"is_preprint":false},{"pmid":"11735029","id":"PMC_11735029","title":"Novel mutations of MYO15A associated with profound deafness in consanguineous families and moderately severe hearing loss in a patient with Smith-Magenis syndrome.","date":"2001","source":"Human genetics","url":"https://pubmed.ncbi.nlm.nih.gov/11735029","citation_count":96,"is_preprint":false},{"pmid":"26915297","id":"PMC_26915297","title":"Effects of genetic correction on the differentiation of hair cell-like cells from iPSCs with MYO15A mutation.","date":"2016","source":"Cell death and differentiation","url":"https://pubmed.ncbi.nlm.nih.gov/26915297","citation_count":78,"is_preprint":false},{"pmid":"27375115","id":"PMC_27375115","title":"Mutational Spectrum of MYO15A and the Molecular Mechanisms of DFNB3 Human Deafness.","date":"2016","source":"Human mutation","url":"https://pubmed.ncbi.nlm.nih.gov/27375115","citation_count":72,"is_preprint":false},{"pmid":"17546645","id":"PMC_17546645","title":"Mutational spectrum of MYO15A: the large N-terminal extension of myosin XVA is required for hearing.","date":"2007","source":"Human mutation","url":"https://pubmed.ncbi.nlm.nih.gov/17546645","citation_count":72,"is_preprint":false},{"pmid":"22736430","id":"PMC_22736430","title":"Screening for MYO15A gene mutations in autosomal recessive nonsyndromic, GJB2 negative Iranian deaf population.","date":"2012","source":"American journal of medical genetics. 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nonsense mutations co-segregated with congenital recessive deafness in three unrelated DFNB3 families, establishing MYO15A as the DFNB3 disease gene.\",\n      \"method\": \"Positional and functional cloning; mutation analysis in affected families\",\n      \"journal\": \"Science\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 — foundational positional cloning with direct mutation-phenotype co-segregation, replicated across three families\",\n      \"pmids\": [\"9603736\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 1999,\n      \"finding\": \"Full-length myosin XV transcripts contain 66 exons, encode ~365 kDa proteins with a unique ~1200-aa N-terminal extension preceding the conserved motor domain, two MyTH4 domains, two FERM-like regions, and a putative SH3 domain; MYO15A protein is concentrated in the cuticular plate and stereocilia of cochlear sensory hair cells, implicating it in formation or maintenance of actin-rich structures of inner ear hair cells.\",\n      \"method\": \"cDNA/genomic sequence analysis; Northern blot; in situ hybridization; immunostaining of adult mouse organ of Corti\",\n      \"journal\": \"Genomics\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 — domain architecture established by sequencing, localization by direct immunostaining with functional implication, replicated in mouse model\",\n      \"pmids\": [\"10552926\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2003,\n      \"finding\": \"Myo15 function in stereocilia development is distinct from Myo6, Myo7a, and pirouette gene functions; double mutant mice display superimposition of single-mutant stereocilia phenotypes without additive hearing loss in heterozygotes, placing Myo15 in a pathway independent of these other myosins.\",\n      \"method\": \"Genetic epistasis via double-mutant crosses; auditory brainstem response testing; cochlear histology\",\n      \"journal\": \"Human molecular genetics\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 — genetic epistasis with double mutants and clear cellular phenotype readout\",\n      \"pmids\": [\"12966030\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2006,\n      \"finding\": \"BAC transgene insertion of Myo15a into shaker-2 (sh2) mutant mice (which lack functional myosin XV) rescues normal hearing, normal stereocilia morphology, and abolishes circling behavior, demonstrating that Myo15a expression in hair cells is sufficient to maintain cochlear structure and function for at least 6 months.\",\n      \"method\": \"BAC transgene rescue; auditory brainstem response; cochlear morphology at 2, 4, 6 months\",\n      \"journal\": \"Hearing research\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 — direct genetic rescue with longitudinal functional and morphological validation\",\n      \"pmids\": [\"16580798\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2007,\n      \"finding\": \"The large N-terminal extension of myosin XVA encoded by alternatively-spliced exon 2 (isoform 1, ~1203 residues) is functionally required for normal hearing; truncating mutations within exon 2 cause severe-to-profound deafness in humans, establishing that isoform 1 is not dispensable.\",\n      \"method\": \"Mutational analysis of affected families; co-segregation of exon 2 truncating mutations with hearing loss phenotype\",\n      \"journal\": \"Human mutation\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 — isoform-specific mutations established as causative through co-segregation in multiple families, replicated across populations\",\n      \"pmids\": [\"17546645\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2007,\n      \"finding\": \"A missense mutation p.Gly1831Val in the motor domain of MYO15A is predicted by molecular modeling to inhibit the powerstroke by reducing backbone flexibility and weakening hydrophobic interactions necessary for signal transmission to the converter domain, providing mechanistic insight into how a motor domain mutation disrupts myosin XV function.\",\n      \"method\": \"Mutation identification by sequencing; molecular modeling of motor head domain\",\n      \"journal\": \"American journal of medical genetics. Part A\",\n      \"confidence\": \"Low\",\n      \"confidence_rationale\": \"Tier 4 — mechanistic inference from computational modeling only, no in vitro validation\",\n      \"pmids\": [\"17853461\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2011,\n      \"finding\": \"A leucine-to-proline substitution in exon 56 of Myo15 within the C-terminal MyTH4 domain of the tail region causes deafness and retinal degeneration in LEW/Ztm-ci2 rats; Myo15 mRNA is expressed in the retina (demonstrated by in situ hybridization and PCR for the first time), showing that mutations in MyTH4 binding domains can cause syndromic rather than only non-syndromic hearing loss.\",\n      \"method\": \"Mutation identification (sequencing of exon 56); in situ hybridization and PCR for retinal expression; electroretinography; histological analysis of retina\",\n      \"journal\": \"PloS one\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 — direct mutation identification with orthogonal methods (expression + phenotypic characterization), single lab\",\n      \"pmids\": [\"21479269\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2021,\n      \"finding\": \"The Whirlin–myosin 15 (MYO15)–Eps8 complex forms tip complex density (TCD)-like condensates at the distal tips of stereocilia through liquid-liquid phase separation driven by specific multivalent interactions; the reconstituted condensates promote actin bundling, and a deafness-associated MYO15 mutation interferes with condensate formation and impairs actin bundling.\",\n      \"method\": \"Reconstitution of protein complex; in vitro phase separation assay; actin bundling assay; mutagenesis of deafness-associated MYO15 variant\",\n      \"journal\": \"Cell reports\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 — reconstitution in vitro with mutagenesis and multiple orthogonal assays (phase separation, actin bundling, mutant characterization)\",\n      \"pmids\": [\"33626355\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2021,\n      \"finding\": \"The MYO15 motor domain (S1) has a mechanochemical ATPase cycle characterized by: kcat ~6 s⁻¹ at 20°C, actin-attached ADP release as the slowest measured step (~12 s⁻¹), a moderate duty ratio (~0.5), and weak thermodynamic coupling between ADP and actin binding, consistent with MYO15 being kinetically adapted for processive motility when oligomerized.\",\n      \"method\": \"Baculovirus-Sf9 recombinant expression; stopped-flow and quenched-flow transient kinetics; in vitro ATPase assay; co-expression with UNC45 and HSP90A chaperones\",\n      \"journal\": \"The Journal of biological chemistry\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 — reconstituted in vitro motor domain with comprehensive kinetic characterization using multiple complementary techniques\",\n      \"pmids\": [\"33372036\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2016,\n      \"finding\": \"MYO15A compound heterozygous mutations (c.4642G>A and c.8374G>A) in iPSC-derived hair cell-like cells cause abnormal morphology and dysfunction; CRISPR/Cas9-mediated genetic correction of the MYO15A mutations in iPSCs rescued both morphology and function of the derived hair cell-like cells, establishing a causal cell-autonomous role for MYO15A in hair cell function.\",\n      \"method\": \"iPSC generation from mutation carriers; hair cell differentiation; CRISPR/Cas9 correction; morphological and functional analysis of hair cell-like cells\",\n      \"journal\": \"Cell death and differentiation\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 — genetic correction with direct phenotypic rescue using multiple orthogonal readouts (morphology + function)\",\n      \"pmids\": [\"26915297\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2024,\n      \"finding\": \"The hair cell-specific Myo15 promoter drives highly specific expression of transgenes in inner ear hair cells (but not other cell types) when used in AAV-PHP.eB vectors; this promoter-driven AAV system efficiently restored otoferlin expression and hearing in Otof⁻/⁻ mice, demonstrating its utility for specific hair cell gene therapy.\",\n      \"method\": \"AAV-mediated gene delivery with Myo15 promoter; GFP reporter assay; ABR hearing threshold measurement; otoferlin exocytosis functional assay in Otof knockout mice\",\n      \"journal\": \"Molecular therapy. Nucleic acids\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 — direct in vivo localization experiment tied to functional consequence, single lab\",\n      \"pmids\": [\"38404504\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2025,\n      \"finding\": \"A third MYO15A isoform (MYO15A-3) is expressed postnatally in hair cells as MYO15A-2 expression wanes; MYO15A-2 initially delivers the elongation-promoting complex (EC) to stereocilia tips, followed by a postnatal handover to MYO15A-3; in Myo15a-3 mutant mice, stereocilia develop normally but lose the EC postnatally and fail to maintain adult architecture, causing progressive hearing loss.\",\n      \"method\": \"Isoform-specific mouse mutant (Myo15a-3 KO); immunofluorescence for EC complex targeting; auditory brainstem response; scanning electron microscopy of hair bundle morphology; expression analysis\",\n      \"journal\": \"bioRxiv\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 — isoform-specific knockout with multiple orthogonal phenotypic readouts (structural, functional, molecular localization), clear mechanistic dissection\",\n      \"pmids\": [\"40027801\"],\n      \"is_preprint\": true\n    },\n    {\n      \"year\": 2024,\n      \"finding\": \"MYO15A isoforms are required for mechanotransduction (MET)-dependent remodeling of the actin cytoskeleton in transducing stereocilia; hair cells lacking all MYO15A isoforms show no MET-dependent remodeling, while cells lacking only the long isoform (MYO15A-1) show increased MET-dependent remodeling including in the tallest non-transducing row, demonstrating that MYO15A isoforms both enable and fine-tune activity-driven stereocilia plasticity.\",\n      \"method\": \"Electron microscopy of stereocilia cytoskeleton; pharmacological MET channel blockade in cochlear explants; isoform-specific Myo15a mutant mice\",\n      \"journal\": \"bioRxiv\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 — direct localization/functional experiment with isoform-specific mutants and pharmacological manipulation, single lab preprint\",\n      \"pmids\": [\"bio_10.1101_2024.09.04.611210\"],\n      \"is_preprint\": true\n    },\n    {\n      \"year\": 2025,\n      \"finding\": \"Introducing the jordan (jd) mutation (D-to-G substitution at the conserved actin-binding interface of MYO15A) into the homologous positions of DdMyo7 (Dictyostelium) and Myo10 significantly decreased filopodial initiation and tip intensity, demonstrating that the actin-binding interface of MyTH-FERM myosins including MYO15A is critical for reorganization of cortical actin during filopodia initiation.\",\n      \"method\": \"Site-directed mutagenesis of actin-binding interface; quantitative filopodia analysis (number, length, tip enrichment); live imaging in DdMyo7 and Myo10 systems\",\n      \"journal\": \"bioRxiv\",\n      \"confidence\": \"Low\",\n      \"confidence_rationale\": \"Tier 3 — findings are primarily in DdMyo7 and Myo10 systems; MYO15A jd mutation used as reference but primary mechanistic data is in other myosins\",\n      \"pmids\": [\"bio_10.1101_2025.05.29.656896\"],\n      \"is_preprint\": true\n    }\n  ],\n  \"current_model\": \"MYO15A encodes an unconventional myosin motor (myosin XVA) that traffics to the tips of cochlear hair cell stereocilia, where its multiple isoforms sequentially deliver an elongation-promoting complex (including Whirlin/WHRN and Eps8) that forms tip complex density condensates via liquid-liquid phase separation to drive actin bundling and stereocilia elongation; the motor domain operates with a moderate duty ratio (~0.5) and slow ADP release kinetics consistent with processive motility, while distinct isoforms (MYO15A-1, -2, -3) fulfill temporally distinct roles—MYO15A-2 drives developmental stereocilia elongation, MYO15A-1 tunes postnatal size of shorter mechanosensitive stereocilia, and MYO15A-3 maintains adult stereocilia architecture—such that loss-of-function mutations in any domain cause hereditary sensorineural deafness DFNB3.\"\n}\n```","stage2_raw":"```json\n{\n  \"mechanistic_narrative\": \"MYO15A encodes myosin XVA, an unconventional myosin motor essential for the development, elongation, and maintenance of stereocilia in inner ear hair cells, and loss-of-function mutations cause autosomal recessive nonsyndromic deafness DFNB3 [PMID:9603736, PMID:16580798]. The protein contains a conserved motor domain with moderate duty ratio (~0.5) and slow ADP release kinetics consistent with processive cargo transport [PMID:33372036], an N-terminal extension unique to isoform 1, and tandem MyTH4-FERM-SH3 tail domains that mediate delivery of the Whirlin–Eps8 elongation-promoting complex to stereocilia tips, where the complex forms liquid-liquid phase separation condensates that drive actin bundling [PMID:33626355, PMID:10552926]. Distinct MYO15A isoforms fulfill temporally separated roles: isoform 2 drives developmental stereocilia elongation, isoform 1 tunes postnatal size of shorter mechanosensitive stereocilia, and isoform 3 maintains adult stereocilia architecture after a postnatal handover from isoform 2 [PMID:40027801, PMID:9603736, PMID:17546645]. MYO15A functions in a pathway independent of other hair cell myosins (MYO6, MYO7A) and is additionally required for mechanotransduction-dependent remodeling of the stereocilia actin cytoskeleton [PMID:12966030].\",\n  \"teleology\": [\n    {\n      \"year\": 1998,\n      \"claim\": \"Identifying MYO15A as the DFNB3 deafness gene established that an unconventional myosin is essential for auditory function, opening the question of what cellular role it plays in the inner ear.\",\n      \"evidence\": \"Positional cloning with mutation co-segregation across three unrelated families with congenital recessive deafness\",\n      \"pmids\": [\"9603736\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Cellular localization and domain function unknown\", \"Protein not yet visualized in hair cells\", \"No functional assay for motor activity\"]\n    },\n    {\n      \"year\": 1999,\n      \"claim\": \"Full-length sequencing revealed a complex multi-domain architecture (unique N-terminal extension, motor, MyTH4-FERM-SH3 tail) and immunolocalization to stereocilia and cuticular plate, linking the motor to actin-rich hair cell structures.\",\n      \"evidence\": \"cDNA/genomic sequencing, Northern blot, immunostaining of mouse organ of Corti\",\n      \"pmids\": [\"10552926\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Cargo and binding partners of tail domains not identified\", \"Motor enzymatic properties unknown\", \"Subcellular trafficking mechanism to stereocilia tips uncharacterized\"]\n    },\n    {\n      \"year\": 2003,\n      \"claim\": \"Genetic epistasis experiments placed Myo15 in a pathway independent of Myo6, Myo7a, and pirouette, establishing that stereocilia development requires multiple non-redundant myosin pathways.\",\n      \"evidence\": \"Double-mutant mouse crosses with ABR testing and cochlear histology\",\n      \"pmids\": [\"12966030\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Specific cargo or effectors unique to the Myo15 pathway not identified\", \"Temporal requirement during development versus maintenance not resolved\"]\n    },\n    {\n      \"year\": 2006,\n      \"claim\": \"BAC transgene rescue of shaker-2 mice proved that Myo15a expression is sufficient to restore hearing and stereocilia morphology, confirming a cell-autonomous hair cell function.\",\n      \"evidence\": \"BAC transgene insertion into sh2 mice; ABR and cochlear morphology over 6 months\",\n      \"pmids\": [\"16580798\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Minimal expression construct or critical domains for rescue not determined\", \"Whether rescue extends beyond 6 months unknown\"]\n    },\n    {\n      \"year\": 2007,\n      \"claim\": \"Identification of truncating mutations within the isoform 1-specific exon 2 demonstrated that the large N-terminal extension is functionally required for hearing, establishing isoform-specific functional requirements.\",\n      \"evidence\": \"Mutational analysis with co-segregation in multiple deaf families\",\n      \"pmids\": [\"17546645\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Biochemical function of the N-terminal extension unknown\", \"Whether shorter isoforms can partially compensate not tested\"]\n    },\n    {\n      \"year\": 2016,\n      \"claim\": \"CRISPR correction of MYO15A mutations in iPSC-derived hair cell-like cells rescued morphology and function, establishing a human cell-autonomous model and confirming causality of specific compound heterozygous mutations.\",\n      \"evidence\": \"iPSC differentiation to hair cell-like cells; CRISPR/Cas9 correction with morphological and functional readouts\",\n      \"pmids\": [\"26915297\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"iPSC-derived hair cells may not fully recapitulate in vivo stereocilia architecture\", \"Specific molecular defect at the stereocilia level not resolved\"]\n    },\n    {\n      \"year\": 2021,\n      \"claim\": \"Reconstitution of the Whirlin–MYO15–Eps8 complex revealed that tip complex density formation occurs via liquid-liquid phase separation that promotes actin bundling, and a deafness mutation disrupts condensate formation, providing the first molecular mechanism linking MYO15A tail interactions to stereocilia elongation.\",\n      \"evidence\": \"In vitro reconstitution of protein complex; phase separation and actin bundling assays; deafness-associated mutant characterization\",\n      \"pmids\": [\"33626355\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Whether LLPS occurs in vivo at stereocilia tips not directly shown\", \"Stoichiometry and regulation of condensate formation in cells unclear\"]\n    },\n    {\n      \"year\": 2021,\n      \"claim\": \"Comprehensive transient kinetic analysis of the MYO15 motor domain revealed a moderate duty ratio (~0.5) and rate-limiting ADP release, providing a biophysical basis for how MYO15A could achieve processive transport when oligomerized.\",\n      \"evidence\": \"Recombinant S1 expressed in Sf9 cells; stopped-flow and quenched-flow kinetics\",\n      \"pmids\": [\"33372036\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Processivity of full-length or dimerized MYO15A not measured\", \"How cargo binding affects motor kinetics unknown\", \"Step size and force generation not determined\"]\n    },\n    {\n      \"year\": 2025,\n      \"claim\": \"Discovery of a third isoform (MYO15A-3) that takes over from MYO15A-2 postnatally to maintain the elongation-promoting complex at stereocilia tips resolved the long-standing question of how stereocilia are maintained in adulthood and showed that isoform switching is critical for progressive hearing preservation.\",\n      \"evidence\": \"Isoform-specific Myo15a-3 knockout mice; immunofluorescence, ABR, SEM (preprint)\",\n      \"pmids\": [\"40027801\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Mechanism triggering the isoform developmental switch unknown\", \"Whether MYO15A-1 and MYO15A-3 have distinct cargo preferences not resolved\", \"Preprint awaiting peer review\"]\n    },\n    {\n      \"year\": null,\n      \"claim\": \"Key unresolved questions include the structural basis of full-length MYO15A processivity and cargo engagement, how LLPS condensates are regulated in vivo, the function of the N-terminal extension of isoform 1, and whether gene therapy targeting MYO15A can restore hearing in DFNB3 patients.\",\n      \"evidence\": \"\",\n      \"pmids\": [],\n      \"confidence\": \"High\",\n      \"gaps\": [\"No crystal or cryo-EM structure of full-length MYO15A\", \"In vivo LLPS regulation at stereocilia tips uncharacterized\", \"Functional role of the ~1200-aa N-terminal extension remains biochemically undefined\", \"No gene therapy rescue of MYO15A-related deafness demonstrated\"]\n    }\n  ],\n  \"mechanism_profile\": {\n    \"molecular_activity\": [\n      {\"term_id\": \"GO:0140657\", \"supporting_discovery_ids\": [8]},\n      {\"term_id\": \"GO:0003774\", \"supporting_discovery_ids\": [8, 1]},\n      {\"term_id\": \"GO:0008092\", \"supporting_discovery_ids\": [7, 13]}\n    ],\n    \"localization\": [\n      {\"term_id\": \"GO:0005856\", \"supporting_discovery_ids\": [1, 7, 12]},\n      {\"term_id\": \"GO:0005886\", \"supporting_discovery_ids\": [1, 7, 11]}\n    ],\n    \"pathway\": [\n      {\"term_id\": \"GO:0005856\", \"supporting_discovery_ids\": []},\n      {\"term_id\": \"R-HSA-9709957\", \"supporting_discovery_ids\": [0, 3, 9]},\n      {\"term_id\": \"R-HSA-1266738\", \"supporting_discovery_ids\": [2, 11, 4]}\n    ],\n    \"complexes\": [\n      \"Whirlin–MYO15A–Eps8 tip complex\"\n    ],\n    \"partners\": [\n      \"WHRN\",\n      \"EPS8\"\n    ],\n    \"other_free_text\": []\n  }\n}\n```"}