{"gene":"MYO7A","run_date":"2026-06-10T05:19:52","timeline":{"discoveries":[{"year":1997,"finding":"MYO7A (myosin-VIIA) mutations cause both Usher syndrome type 1B (syndromic deafness with retinitis pigmentosa and vestibular dysfunction) and isolated autosomal recessive deafness DFNB2, establishing that different mutations in the same gene produce syndromic vs. non-syndromic phenotypes. A G-to-A transition at the last nucleotide of exon 15 was identified, predicted to decrease splicing efficiency.","method":"Sequence analysis of coding exons, linkage analysis, mutation characterization in affected family","journal":"Nature genetics","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — mutation identification with splicing prediction, single study, linkage + sequencing","pmids":["9171833"],"is_preprint":false},{"year":2004,"finding":"A missense mutation (p.R853C) in the fifth IQ motif (IQ5) of MYO7A disrupts calmodulin (CaM) binding. Functional assay in smooth muscle cells showed wild-type IQ5 competes with myosin light chain kinase for CaM, but the p.R853C mutant IQ5 does not bind CaM constitutively, demonstrating that impaired CaM/MYO7A interaction causes autosomal dominant hearing loss (DFNA11).","method":"Expression of MYO7A IQ5-containing peptides in smooth muscle cells of microarteries; calmodulin-dependent vasoconstriction assay; functional competition assay","journal":"Human mutation","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — physiological cellular functional assay with controls, single lab, two methods (expression + vasoconstriction assay)","pmids":["15300860"],"is_preprint":false},{"year":2004,"finding":"A missense mutation (p.N458I) in the motor head domain of MYO7A predicted by molecular modeling (based on Dictyostelium myosin II crystal structure) to disrupt ATP/ADP binding and impair the myosin power-stroke, causing DFNA11 autosomal dominant hearing loss.","method":"Linkage analysis, MYO7A gene sequencing, molecular modeling of motor domain based on known myosin II crystal structure","journal":"Human genetics","confidence":"Low","confidence_rationale":"Tier 4 / Weak — molecular modeling only, no in vitro enzymatic or structural validation of the mutation's effect","pmids":["15221449"],"is_preprint":false},{"year":2006,"finding":"A missense mutation (p.A230V) in the motor domain of MYO7A causes autosomal dominant non-syndromic hearing loss (DFNA11). Molecular modeling of the myosin VIIA motor domain provided evidence for significant functional effect of the substitution.","method":"Genome-wide scan, MYO7A sequencing, molecular modeling of motor domain","journal":"Audiology & neuro-otology","confidence":"Low","confidence_rationale":"Tier 4 / Weak — molecular modeling only, no biochemical or cell-based functional assay","pmids":["16449806"],"is_preprint":false},{"year":2007,"finding":"MYO7A participates in the apical localization of melanosomes in retinal pigment epithelium (RPE) cells via a RAB27A-MYRIP-MYO7A complex. Live-cell imaging, fractionation, and mutant mouse analyses demonstrated that RAB27A provides an essential link to the melanosome, MYRIP associates with melanosomes via RAB27A, and that MYO7A functions in melanosome motility in the apical RPE.","method":"Live-cell imaging of primary RPE cells, RPE cell fractionation, analysis of mutant mice (Rab27a and Myo7a mutants), immunolocalization","journal":"Cell motility and the cytoskeleton","confidence":"High","confidence_rationale":"Tier 2 / Strong — live imaging + fractionation + genetic mouse models (multiple orthogonal methods), replicated with multiple mutant strains","pmids":["17352418"],"is_preprint":false},{"year":2008,"finding":"USH1B/MYO7A disease pathology begins in photoreceptors (cell-autonomous), not in the adjacent RPE, as demonstrated by mosaic retinas in Myo7a-deficient shaker1 mice where mutant photoreceptor phenotype was cell-autonomous and not secondary to mutant RPE cells.","method":"Mosaic retina analysis in Myo7a-deficient shaker1 mice, optical imaging of human USH1B retinas, visual function testing","journal":"Human molecular genetics","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — mosaic mouse retina analysis, single lab, two complementary approaches (mouse and human imaging)","pmids":["18463160"],"is_preprint":false},{"year":2008,"finding":"A DFNB2 MYO7A allele (p.E1716del, three-nucleotide deletion in the tail domain) produces a protein that localizes correctly in transfected mouse hair cell stereocilia, unlike USH1B alleles which mislocalize. This demonstrates that DFNB2 alleles retain residual myosin VIIA function, explaining the less severe phenotype.","method":"GFP-tagged cDNA expression constructs in transfected mouse hair cells; fluorescence microscopy of stereociliary localization","journal":"Human mutation","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — direct protein localization assay in hair cells with engineered mutations and appropriate controls, single lab","pmids":["18181211"],"is_preprint":false},{"year":2009,"finding":"In Myo7a-null mouse RPE, melanosomes are mislocalized: fluorophores (melanosomes) are absent from apical processes of RPE, and NIR-autofluorescence (sourced from RPE and choroidal melanosomes) is abnormal in regions lacking photoreceptors in USH1B patients. This directly links MYO7A to melanosome localization in the apical RPE.","method":"Spectral deconvolution confocal microscopy of ex vivo mouse retinas, scanning laser ophthalmoscopy in USH1B patients, purified RPE melanosome spectral analysis","journal":"Investigative ophthalmology & visual science","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — ex vivo imaging + purified organelle analysis + in vivo imaging, single lab, multiple orthogonal methods","pmids":["19324852"],"is_preprint":false},{"year":2011,"finding":"MYO7A is required for the light-dependent translocation of RPE65 (the key retinoid cycle isomerase) to the central region of RPE cells. In Myo7a-mutant mice, RPE65 is mislocalized in the light and degraded more rapidly, resulting in lower RPE65 levels and a deficiency in retinoid cycle activity. MYO7A and RPE65 were co-immunoprecipitated from RPE cell lysate, suggesting a direct or indirect interaction.","method":"Immunofluorescence localization in Myo7a-mutant and wild-type mice, RPE65 protein level quantification, retinyl ester measurement after photobleach, co-immunoprecipitation from RPE cell lysate","journal":"Human molecular genetics","confidence":"High","confidence_rationale":"Tier 2 / Strong — co-IP + localization + biochemical functional assay (retinoid cycle activity) + loss-of-function mouse, multiple orthogonal methods in one study","pmids":["21493626"],"is_preprint":false},{"year":2011,"finding":"MYO7A in photoreceptor cells functions as a selective barrier for membrane proteins at the distal end of the transition zone of the cilium: in cells lacking MYO7A, opsin accumulates abnormally in the transition zone, indicating MYO7A restricts opsin passage at this site.","method":"Immunolocalization of opsin in Myo7a-null mouse photoreceptors","journal":"Biochemical Society transactions","confidence":"Medium","confidence_rationale":"Tier 3 / Moderate — immunolocalization in knockout mice, replicated finding cited from prior work, single method in this review","pmids":["21936790"],"is_preprint":false},{"year":2011,"finding":"MYO7A participates in the removal of phagosomes from the apical RPE and their delivery to lysosomes in the basal RPE, functioning cooperatively with microtubule motors in this second role while competing with them in melanosome apical localization.","method":"Studies with MYO7A-null mice (phagosome localization analysis)","journal":"Biochemical Society transactions","confidence":"Medium","confidence_rationale":"Tier 3 / Moderate — loss-of-function mouse model, localization assay, single lab cited as established findings","pmids":["21936790"],"is_preprint":false},{"year":2013,"finding":"MYO7A motor domain mutation (p.R668H) significantly reduces actin-activated ATPase activity, demonstrating that the conserved R668 residue in the motor domain is required for ATPase function and that its disruption causes DFNA11 autosomal dominant hearing impairment.","method":"Actin-activated ATPase activity assay (NADH oxidation rate) comparing wild-type and p.R668H mutant MYO7A; molecular modeling","journal":"PloS one","confidence":"Medium","confidence_rationale":"Tier 1 / Moderate — in vitro enzymatic assay directly measuring ATPase activity, single lab with both enzymatic and structural modeling","pmids":["23383098"],"is_preprint":false},{"year":2016,"finding":"MYO7A forms a stable complex with PDZD7 (a paralog of USH1C and DFNB31) in stereocilia membrane fractions. MYO7A and PDZD7 interact in tissue-culture cells and co-localize to the ankle-link region of stereocilia in wild-type but not Myo7a mutant mice, establishing MYO7A as required for PDZD7 localization at the ankle link.","method":"Isolation of protein complexes from stereocilia membrane fractions, mass spectrometry quantification, co-localization in wild-type and Myo7a mutant mice, tissue-culture interaction assay","journal":"eLife","confidence":"High","confidence_rationale":"Tier 2 / Strong — biochemical complex isolation from native tissue + MS identification + genetic validation in Myo7a mutant mice + tissue-culture interaction, multiple orthogonal methods","pmids":["27525485"],"is_preprint":false},{"year":2016,"finding":"The Drosophila ortholog of MYO7A (CRINKLED/CK) selectively interacts with the initiator caspase DRONC and acts as a substrate adaptor recruiting SHAGGY46/GSK3-β to DRONC, facilitating caspase-mediated cleavage and localized modulation of kinase activity. The mammalian MYO7A binds to and impinges on CASPASE-8, affecting RIPK1>CASPASE-8 signalling.","method":"Genetic loss-of-function in Drosophila (arista, border cells, wing disc), co-immunoprecipitation/interaction assays, caspase cleavage assay, mammalian MYO7A-CASPASE-8 binding assay","journal":"Nature communications","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — genetic epistasis in Drosophila + Co-IP in mammalian cells; the mammalian MYO7A-CASPASE-8 interaction is a single pulldown finding","pmids":["26960254"],"is_preprint":false},{"year":2016,"finding":"Genetic correction of a MYO7A mutation (c.4118C>T) in patient-derived iPSCs using CRISPR/Cas9 restored normal stereocilia-like protrusion organization and electrophysiological function in derived hair cell-like cells, confirming that MYO7A is required for proper stereociliary bundle assembly and hair cell function.","method":"CRISPR/Cas9 gene correction in patient iPSCs, differentiation to hair cell-like cells, morphological assessment of stereocilia, electrophysiological recording","journal":"Stem cells translational medicine","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — genetic rescue with functional readout (electrophysiology + morphology), single lab, isogenic correction controls","pmids":["27013738"],"is_preprint":false},{"year":2010,"finding":"An exonic missense mutation (c.1935G>A, p.M645I) at the last nucleotide of exon 16 enhances a pre-existing minor alternative splicing event, promoting exon 16 exclusion rather than full exon inclusion. This partial splicing impairment causes a less severe (atypical USH/mild retinopathy) phenotype than USH1B-associated alleles. Confirmed by hybrid minigene splicing assay.","method":"Endogenous lymphoid RNA analysis, splicing minigene transfection assay, structural prediction of molecular model","journal":"Molecular vision","confidence":"Medium","confidence_rationale":"Tier 1 / Moderate — minigene assay directly demonstrating splicing effect, single lab, two methods (endogenous RNA + minigene)","pmids":["21031134"],"is_preprint":false},{"year":2011,"finding":"Five putative splice-site mutations in MYO7A (c.2283-1G>T and c.5856G>A) and USH2A were shown by hybrid minigene assays to abolish consensus splice sites, producing exon skipping. This confirmed the pathogenic mechanism of these variants as loss of normal splicing.","method":"Hybrid minigene splicing assay, bioinformatic splice site prediction","journal":"Clinical genetics","confidence":"Medium","confidence_rationale":"Tier 1 / Moderate — in vitro minigene functional assay for splicing, single lab, directly demonstrates mechanism","pmids":["20497194"],"is_preprint":false},{"year":2025,"finding":"Postnatal deletion of Myo7a in cochlear hair cells causes progressive decline in MET current amplitude and hair-bundle stiffness without initially affecting hearing function or resting open probability (Po) of MET channels. This demonstrates MYO7A is essential for structural integrity of hair bundles and MET current magnitude in mature hair cells, but mature hair cells use a MYO7A-independent mechanism to maintain resting MET channel Po. Myo7a deficiency also increased vulnerability to sound-induced damage and downregulated stereociliary genes.","method":"Postnatal conditional deletion of Myo7a (Cre-mediated), electrophysiology (MET current recording), hair-bundle stiffness measurement, noise exposure, RNA-sequencing","journal":"Proceedings of the National Academy of Sciences of the United States of America","confidence":"High","confidence_rationale":"Tier 1 / Strong — conditional KO + electrophysiology + mechanical measurements + transcriptomics, multiple orthogonal methods in one study","pmids":["39746042"],"is_preprint":false},{"year":2024,"finding":"In vivo AAV9-Myo7a gene rescue in shaker-1 (Myo7a mutant) mice restores IHC function, reestablishes normal adult IHC synaptic profile (eliminating ectopic lateral olivocochlear efferent axosomatic contacts with IHCs), and improves hearing thresholds. This demonstrates that ectopic efferent plasticity in the adult cochlea results directly from MET current dysfunction caused by Myo7a mutation.","method":"AAV9-mediated gene delivery, auditory brainstem response (hearing threshold measurement), morphological synaptic analysis (confocal immunofluorescence), mechanoelectrical transducer current recording","journal":"JCI insight","confidence":"High","confidence_rationale":"Tier 2 / Strong — gene rescue in vivo + functional (electrophysiology + hearing thresholds) + structural (synapse morphology) readouts, multiple orthogonal methods","pmids":["39641274"],"is_preprint":false},{"year":2025,"finding":"Two MYO7A isoforms (MYO7A-C and MYO7A-N) are expressed in auditory hair cells with opposing tonotopic gradients in OHCs (IHCs primarily express MYO7A-C). Both isoforms localize to the upper tip-link insertion site. Loss of MYO7A-N leads to OHC degeneration and progressive hearing loss. Cryo-EM structures reveal isoform-specific differences at actomyosin interfaces correlating with distinct ATPase activities, suggesting isoform specialization tunes tip-link tension.","method":"Isoform-specific knock-in mice, cryo-EM structural determination, ATPase activity assay, immunolocalization, auditory function testing","journal":"bioRxiv","confidence":"High","confidence_rationale":"Tier 1 / Strong — cryo-EM structure + biochemical ATPase assay + genetic knock-in mouse with functional phenotype, multiple orthogonal methods in one study","pmids":["40236041"],"is_preprint":true},{"year":2025,"finding":"AAV-mediated rescue of Myo7a in newborn shaker-1 mice substantially rescues IHC hair bundle structure and restores mechanoelectrical transducer (MET) currents, including normal resting open probability of MET channels, and mature basolateral membrane current profile. Rescue of IHC (but not OHC) function produces 20-30 dB improvement in hearing thresholds, demonstrating MYO7A is essential for IHC stereocilia mechanotransduction and maturation.","method":"Dual-AAV8 and dual-AAV9 gene delivery in Myo7aSh1/Sh1 mice, MET current electrophysiology, auditory brainstem response, fluid-jet hair bundle stimulation","journal":"The Journal of physiology","confidence":"High","confidence_rationale":"Tier 1 / Strong — gene rescue + electrophysiology (MET currents + basolateral currents) + hearing threshold measurement, multiple orthogonal methods","pmids":["41015536"],"is_preprint":false},{"year":2004,"finding":"A Myo7a motor domain missense mutation (I178F) in headbanger mice causes abnormal stereocilia bundle development (more severe in apex than base, with long thin wispy utricular stereocilia) and reduced myosin VIIa protein levels in the inner ear, demonstrating a role for the MYO7A motor domain in stereocilia bundle morphogenesis.","method":"ENU mutagenesis screen, scanning electron microscopy of organ of Corti and utricle, protein expression analysis, auditory threshold testing","journal":"Mammalian genome","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — mouse mutant with defined point mutation, SEM morphology + protein quantification + hearing function, single lab","pmids":["15389316"],"is_preprint":false},{"year":2023,"finding":"Two major MYO7A isoforms (IF1 and IF2) are both expressed in RPE and neural retina, with IF2 approximately 7-fold more abundant than IF1. 3D modeling shows the 38-amino-acid region unique to IF1 affects the C lobe of the FERM1 domain and the opening of a cleft in this protein-binding domain, suggesting isoform-specific protein-binding differences.","method":"qPCR quantification of isoform expression in RPE and neural retina (pig, mouse, human), 3D molecular modeling of isoforms","journal":"Vision research","confidence":"Low","confidence_rationale":"Tier 4 / Weak — expression quantification and computational modeling only, no direct functional validation of isoform-specific interactions","pmids":["37586294"],"is_preprint":false},{"year":2010,"finding":"Loss of harmonin (USH1C) in Ush1c knockout mice does not affect the cytoplasmic distribution of Myo7a in cochlear hair cells (Myo7a remains normally distributed throughout the cytoplasm), but does cause mislocalization of Pcdh15 and Sans, indicating Myo7a localization is independent of harmonin.","method":"Immunofluorescence of cochlear sections and whole-mount preparations from Ush1c(-/-) knockout mice","journal":"International journal of experimental pathology","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — direct localization in knockout mouse with specific protein readout, single lab","pmids":["21156003"],"is_preprint":false},{"year":2022,"finding":"A synonymous variant (c.2904G>A, p.Glu968=) in MYO7A exon 23 causes exon 23 skipping and produces a truncated protein, confirmed by in vitro minigene splicing assay. This establishes a mechanistic basis for DFNB2 through a synonymous (silent) exonic variant affecting splicing.","method":"Targeted next-generation sequencing, Sanger sequencing, minigene splicing assay","journal":"Journal of clinical laboratory analysis","confidence":"Medium","confidence_rationale":"Tier 1 / Moderate — minigene assay directly demonstrates splicing disruption, single lab","pmids":["36164746"],"is_preprint":false}],"current_model":"MYO7A encodes an unconventional actin-based motor (myosin VIIA) that is essential for the structural integrity and mechanotransduction function of stereociliary bundles in cochlear and vestibular hair cells, where it localizes to the upper tip-link insertion site, maintains MET current amplitude and hair-bundle stiffness through two tonotopically specialized isoforms with distinct ATPase activities, and in the RPE drives apical melanosome localization via a RAB27A-MYRIP-MYO7A complex, facilitates phagosome trafficking from apical to basal RPE, and mediates light-dependent translocation of the visual cycle enzyme RPE65 through a direct or indirect interaction; loss-of-function mutations across the motor domain, IQ (calmodulin-binding) motifs, and tail domain cause a spectrum of deafness/blindness disorders (USH1B, DFNB2, DFNA11) depending on the degree of residual protein function and correct subcellular localization."},"narrative":{"mechanistic_narrative":"MYO7A encodes an unconventional actin-based motor (myosin VIIA) that is essential for the structural integrity and mechanotransduction of cochlear and vestibular hair-cell stereociliary bundles and for melanosome and visual-cycle protein trafficking in the retinal pigment epithelium [PMID:39746042, PMID:17352418]. In hair cells, MYO7A localizes to the upper tip-link insertion site and sustains mechanoelectrical transducer (MET) current amplitude and hair-bundle stiffness, while its motor domain drives proper stereocilia bundle morphogenesis and assembly [PMID:39746042, PMID:15389316, PMID:27013738]; gene-replacement of mutant Myo7a in vivo restores MET currents, normal resting channel open probability, hair-bundle structure, and hearing thresholds, establishing that the cochlear phenotype is a direct, reversible consequence of motor dysfunction [PMID:41015536, PMID:39641274]. Two tonotopically distributed isoforms with isoform-specific actomyosin interfaces and distinct ATPase activities tune tip-link tension, and motor-domain residues such as R668 are required for actin-activated ATPase activity [PMID:40236041, PMID:23383098]. MYO7A also organizes the stereociliary scaffold by forming a stable complex with PDZD7 and is required for PDZD7 localization to the ankle-link region [PMID:27525485]. In the RPE, MYO7A operates within a RAB27A–MYRIP–MYO7A complex to drive apical melanosome localization, participates in phagosome transport from apical to basal RPE, and is required for light-dependent translocation of the visual-cycle isomerase RPE65, with which it co-immunoprecipitates [PMID:17352418, PMID:21936790, PMID:21493626]; in photoreceptors it acts cell-autonomously and functions as a selective barrier restricting opsin passage at the ciliary transition zone [PMID:18463160, PMID:21936790]. Mutations spanning the motor domain, IQ/calmodulin-binding motifs, and tail domain, as well as splice- and synonymous-variant–induced exon skipping, cause a phenotypic spectrum of Usher syndrome type 1B, recessive deafness DFNB2, and dominant deafness DFNA11, graded by residual motor function and correct subcellular localization [PMID:9171833, PMID:15300860, PMID:18181211, PMID:36164746].","teleology":[{"year":1997,"claim":"Established that MYO7A is a disease gene and that allelic heterogeneity produces distinct clinical outcomes, framing the question of how different mutations yield syndromic versus non-syndromic disease.","evidence":"Linkage and coding-exon sequencing in families with Usher syndrome 1B and isolated deafness DFNB2","pmids":["9171833"],"confidence":"Medium","gaps":["Did not establish the protein's molecular activity or subcellular site of action","Splicing prediction not functionally tested"]},{"year":2004,"claim":"Linked specific MYO7A domains to dominant deafness mechanisms — disrupted calmodulin binding at IQ5 and predicted impairment of the motor power-stroke — beginning to map genotype to molecular defect.","evidence":"Calmodulin-competition/vasoconstriction assay for the IQ5 p.R853C mutant; molecular modeling of motor-domain mutations p.N458I and p.A230V","pmids":["15300860","15221449","16449806"],"confidence":"Medium","gaps":["Motor-domain effects rested on modeling only, without enzymatic validation","Did not address how CaM loss alters motor mechanics in hair cells"]},{"year":2004,"claim":"Connected the MYO7A motor domain directly to stereocilia bundle morphogenesis in vivo, showing a point mutation alters bundle development and reduces protein levels.","evidence":"ENU-derived headbanger mouse (I178F): SEM of organ of Corti and utricle, protein quantification, auditory thresholds","pmids":["15389316"],"confidence":"Medium","gaps":["Did not resolve whether the defect is loss of motor activity or protein instability","Molecular partners at the bundle not identified"]},{"year":2007,"claim":"Defined a molecular machine for RPE melanosome transport, placing MYO7A as the actin motor downstream of a RAB27A–MYRIP membrane-recruitment module.","evidence":"Live-cell imaging, fractionation, and Rab27a/Myo7a mutant mouse analysis of primary RPE","pmids":["17352418"],"confidence":"High","gaps":["Direct biochemical reconstitution of the tripartite complex not shown","Mechanism coordinating actin and microtubule transport unresolved"]},{"year":2008,"claim":"Resolved the cellular origin of USH1B retinal disease and the basis of DFNB2 mildness — photoreceptor pathology is cell-autonomous, and DFNB2 alleles retain function by localizing correctly.","evidence":"Mosaic shaker1 retina analysis and human imaging; GFP-tagged DFNB2 vs USH1B allele localization in transfected hair cells","pmids":["18463160","18181211"],"confidence":"Medium","gaps":["Did not quantify residual motor activity of DFNB2 alleles","Cell-autonomous mechanism in photoreceptors not molecularly defined"]},{"year":2009,"claim":"Provided in vivo confirmation that MYO7A is required for apical melanosome positioning in RPE, linking the motor to organelle distribution detectable by clinical imaging.","evidence":"Spectral confocal of ex vivo mouse retina, purified RPE melanosome analysis, in vivo scanning laser ophthalmoscopy in patients","pmids":["19324852"],"confidence":"Medium","gaps":["Functional consequence of melanosome mislocalization for vision not established here"]},{"year":2011,"claim":"Expanded MYO7A's RPE roles to visual-cycle regulation, photoreceptor ciliary gating, and phagosome clearance, broadening its function beyond melanosome motility.","evidence":"RPE65 co-IP, localization, retinoid measurements, and opsin/phagosome localization in Myo7a-null mice","pmids":["21493626","21936790"],"confidence":"High","gaps":["RPE65 interaction not resolved as direct vs indirect","Mechanism of the transition-zone barrier function unknown"]},{"year":2013,"claim":"Provided the first direct enzymatic evidence that a DFNA11 motor-domain mutation impairs catalytic activity, validating earlier modeling predictions.","evidence":"Actin-activated ATPase (NADH oxidation) assay comparing wild-type and p.R668H MYO7A","pmids":["23383098"],"confidence":"Medium","gaps":["Single mutation tested; not linked to in vivo bundle mechanics","Dominant-negative mechanism not demonstrated"]},{"year":2016,"claim":"Identified MYO7A as a scaffolding organizer in stereocilia, required to localize PDZD7 to the ankle-link region, and uncovered a conserved non-sensory role in caspase signaling.","evidence":"Stereocilia complex isolation + MS + Myo7a-mutant co-localization for PDZD7; Drosophila genetics and mammalian Co-IP for caspase interactions","pmids":["27525485","26960254"],"confidence":"Medium","gaps":["Mammalian MYO7A–CASPASE-8 interaction rests on a single pulldown","Physiological relevance of the caspase-adaptor role in mammals untested"]},{"year":2016,"claim":"Demonstrated causality and reversibility at the cellular level by correcting a patient MYO7A mutation and restoring stereocilia organization and electrophysiology in iPSC-derived hair cells.","evidence":"CRISPR/Cas9 isogenic correction in patient iPSCs, hair-cell differentiation, morphology, electrophysiology","pmids":["27013738"],"confidence":"Medium","gaps":["In vitro hair-cell-like cells may not fully model mature cochlear hair cells"]},{"year":2025,"claim":"Defined MYO7A's role in mature hair cells and established isoform specialization — distinct tonotopic isoforms with different ATPase activities tune tip-link tension, while MYO7A sustains MET current and bundle stiffness but is dispensable for resting channel open probability.","evidence":"Postnatal conditional KO with electrophysiology, stiffness, RNA-seq; isoform-specific knock-in mice with cryo-EM structures and ATPase assays","pmids":["39746042","40236041"],"confidence":"High","gaps":["Identity of the MYO7A-independent mechanism maintaining resting MET Po unknown","Isoform structural study is a preprint awaiting peer review"]},{"year":2025,"claim":"Established therapeutic proof-of-concept by showing AAV-delivered MYO7A restores IHC bundle structure, MET currents with normal resting open probability, and hearing, and that ectopic efferent plasticity is a direct downstream consequence of MET dysfunction.","evidence":"Dual-AAV gene delivery in shaker-1 mice with MET electrophysiology, ABR thresholds, fluid-jet stimulation, and synaptic morphology","pmids":["41015536","39641274"],"confidence":"High","gaps":["OHC function not rescued, limiting threshold recovery","Durability and translatability of rescue not established"]},{"year":null,"claim":"How MYO7A motor mechanics, isoform-specific ATPase tuning, and its scaffolding interactions integrate to set tip-link tension and mechanotransduction in vivo, and how its distinct RPE trafficking roles are coordinated, remain incompletely resolved.","evidence":"","pmids":[],"confidence":"Medium","gaps":["No integrated model linking isoform ATPase rates to measured tip-link tension in vivo","Direct vs indirect nature of the RPE65 interaction unresolved","Mechanism coordinating actin- and microtubule-based RPE transport unknown"]}],"mechanism_profile":{"molecular_activity":[{"term_id":"GO:0140657","term_label":"ATP-dependent activity","supporting_discovery_ids":[11,19]},{"term_id":"GO:0003774","term_label":"cytoskeletal motor activity","supporting_discovery_ids":[17,21]},{"term_id":"GO:0008092","term_label":"cytoskeletal protein binding","supporting_discovery_ids":[11,19]},{"term_id":"GO:0060090","term_label":"molecular adaptor activity","supporting_discovery_ids":[12,4]}],"localization":[{"term_id":"GO:0005856","term_label":"cytoskeleton","supporting_discovery_ids":[17,19,12]},{"term_id":"GO:0005929","term_label":"cilium","supporting_discovery_ids":[9]},{"term_id":"GO:0005829","term_label":"cytosol","supporting_discovery_ids":[23,4]}],"pathway":[],"complexes":["RAB27A-MYRIP-MYO7A melanosome transport complex","MYO7A-PDZD7 ankle-link complex"],"partners":["PDZD7","RAB27A","MYRIP","RPE65","CALM1","CASP8"],"other_free_text":[]}},"prefetch_data":{"uniprot":{"accession":"Q13402","full_name":"Unconventional myosin-VIIa","aliases":[],"length_aa":2215,"mass_kda":254.4,"function":"Myosins are actin-based motor molecules with ATPase activity. Unconventional myosins serve in intracellular movements. Their highly divergent tails bind to membranous compartments, which are then moved relative to actin filaments. In the retina, plays an important role in the renewal of the outer photoreceptor disks. Plays an important role in the distribution and migration of retinal pigment epithelial (RPE) melanosomes and phagosomes, and in the regulation of opsin transport in retinal photoreceptors. In the inner ear, plays an important role in differentiation, morphogenesis and organization of cochlear hair cell bundles. Involved in hair-cell vesicle trafficking of aminoglycosides, which are known to induce ototoxicity (By similarity). Motor protein that is a part of the functional network formed by USH1C, USH1G, CDH23 and MYO7A that mediates mechanotransduction in cochlear hair cells. 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England)","url":"https://pubmed.ncbi.nlm.nih.gov/31320737","citation_count":8,"is_preprint":false},{"pmid":"23237960","id":"PMC_23237960","title":"An Usher syndrome type 1 patient diagnosed before the appearance of visual symptoms by MYO7A mutation analysis.","date":"2012","source":"International journal of pediatric otorhinolaryngology","url":"https://pubmed.ncbi.nlm.nih.gov/23237960","citation_count":8,"is_preprint":false},{"pmid":"29605349","id":"PMC_29605349","title":"Utility of whole exome sequencing in the diagnosis of Usher syndrome: Report of novel compound heterozygous MYO7A mutations.","date":"2018","source":"International journal of pediatric otorhinolaryngology","url":"https://pubmed.ncbi.nlm.nih.gov/29605349","citation_count":8,"is_preprint":false},{"pmid":"38884554","id":"PMC_38884554","title":"Multicentric Longitudinal Prospective Study in a European Cohort of MYO7A Patients: Disease Course and Implications for Gene Therapy.","date":"2024","source":"Investigative ophthalmology & visual science","url":"https://pubmed.ncbi.nlm.nih.gov/38884554","citation_count":7,"is_preprint":false},{"pmid":"28731162","id":"PMC_28731162","title":"A homozygous MYO7A mutation associated to Usher syndrome and unilateral auditory neuropathy spectrum disorder.","date":"2017","source":"Molecular medicine reports","url":"https://pubmed.ncbi.nlm.nih.gov/28731162","citation_count":7,"is_preprint":false},{"pmid":"23559863","id":"PMC_23559863","title":"Novel compound heterozygous mutations in MYO7A in a Chinese family with Usher syndrome type 1.","date":"2013","source":"Molecular vision","url":"https://pubmed.ncbi.nlm.nih.gov/23559863","citation_count":7,"is_preprint":false},{"pmid":"28451532","id":"PMC_28451532","title":"Screening of Myo7A Mutations in Iranian Patients with Autosomal Recessive Hearing Loss from West of Iran.","date":"2017","source":"Iranian journal of public health","url":"https://pubmed.ncbi.nlm.nih.gov/28451532","citation_count":6,"is_preprint":false},{"pmid":"30881389","id":"PMC_30881389","title":"Novel deleterious mutation in MYO7A, TH and EVC2 in two Pakistani brothers with familial deafness.","date":"2019","source":"Pakistan journal of medical sciences","url":"https://pubmed.ncbi.nlm.nih.gov/30881389","citation_count":6,"is_preprint":false},{"pmid":"39641274","id":"PMC_39641274","title":"In vivo AAV9-Myo7a gene rescue restores hearing and cholinergic efferent innervation in inner hair cells.","date":"2024","source":"JCI insight","url":"https://pubmed.ncbi.nlm.nih.gov/39641274","citation_count":5,"is_preprint":false},{"pmid":"33955556","id":"PMC_33955556","title":"A natural knockout of the MYO7A gene leads to pre-weaning mortality in pigs.","date":"2021","source":"Animal genetics","url":"https://pubmed.ncbi.nlm.nih.gov/33955556","citation_count":5,"is_preprint":false},{"pmid":"9761396","id":"PMC_9761396","title":"Map refinement of the Usher syndrome type 1B gene, MYO7A, relative to 11q13.5 microsatellite markers.","date":"1998","source":"Clinical genetics","url":"https://pubmed.ncbi.nlm.nih.gov/9761396","citation_count":5,"is_preprint":false},{"pmid":"33976695","id":"PMC_33976695","title":"Next-Generation Sequencing Identifies Pathogenic Variants in HGF, POU3F4, TECTA, and MYO7A in Consanguineous Pakistani Deaf Families.","date":"2021","source":"Neural plasticity","url":"https://pubmed.ncbi.nlm.nih.gov/33976695","citation_count":5,"is_preprint":false},{"pmid":"10447383","id":"PMC_10447383","title":"Identification of three novel mutations in the MYO7A gene.","date":"1999","source":"Human mutation","url":"https://pubmed.ncbi.nlm.nih.gov/10447383","citation_count":5,"is_preprint":false},{"pmid":"36164746","id":"PMC_36164746","title":"Novel compound heterozygous synonymous and missense variants in the MYO7A gene identified by next-generation sequencing in a Chinese family with nonsyndromic hearing loss.","date":"2022","source":"Journal of clinical laboratory analysis","url":"https://pubmed.ncbi.nlm.nih.gov/36164746","citation_count":4,"is_preprint":false},{"pmid":"30612476","id":"PMC_30612476","title":"Lower expression of prestin and MYO7A correlates with menopause-associated hearing loss.","date":"2019","source":"Climacteric : the journal of the International Menopause Society","url":"https://pubmed.ncbi.nlm.nih.gov/30612476","citation_count":4,"is_preprint":false},{"pmid":"33835720","id":"PMC_33835720","title":"Novel dilated cardiomyopathy associated to Calreticulin and Myo7A gene mutation in Usher syndrome.","date":"2021","source":"ESC heart failure","url":"https://pubmed.ncbi.nlm.nih.gov/33835720","citation_count":4,"is_preprint":false},{"pmid":"15592175","id":"PMC_15592175","title":"Genetic analysis of a four generation Indian family with Usher syndrome: a novel insertion mutation in MYO7A.","date":"2004","source":"Molecular vision","url":"https://pubmed.ncbi.nlm.nih.gov/15592175","citation_count":4,"is_preprint":false},{"pmid":"26309859","id":"PMC_26309859","title":"Phenotype of Usher syndrome type II assosiated with compound missense mutations of c.721 C>T and c.1969 C>T in MYO7A in a Chinese Usher syndrome family.","date":"2015","source":"International journal of ophthalmology","url":"https://pubmed.ncbi.nlm.nih.gov/26309859","citation_count":4,"is_preprint":false},{"pmid":"29287847","id":"PMC_29287847","title":"Targeted next generation sequencing identified a novel mutation in MYO7A causing Usher syndrome type 1 in an Iranian consanguineous pedigree.","date":"2017","source":"International journal of pediatric otorhinolaryngology","url":"https://pubmed.ncbi.nlm.nih.gov/29287847","citation_count":4,"is_preprint":false},{"pmid":"41015536","id":"PMC_41015536","title":"Adeno-associated virus-based rescue of Myo7a expression restores hair-cell function and improves hearing thresholds in a USH1B mouse strain.","date":"2025","source":"The Journal of physiology","url":"https://pubmed.ncbi.nlm.nih.gov/41015536","citation_count":3,"is_preprint":false},{"pmid":"37727480","id":"PMC_37727480","title":"Autosomal dominant non-syndromic hearing loss caused by a novel mutation in MYO7A: A case report and review of the literature.","date":"2023","source":"World journal of clinical cases","url":"https://pubmed.ncbi.nlm.nih.gov/37727480","citation_count":3,"is_preprint":false},{"pmid":"32428919","id":"PMC_32428919","title":"The p.R206C Mutation in MYO7A Leads to Autosomal Dominant Nonsyndromic Hearing Loss.","date":"2020","source":"ORL; journal for oto-rhino-laryngology and its related specialties","url":"https://pubmed.ncbi.nlm.nih.gov/32428919","citation_count":3,"is_preprint":false},{"pmid":"31997689","id":"PMC_31997689","title":"Investigation of MYO15A and MYO7A Mutations in Iranian Patients with Nonsyndromic Hearing Loss.","date":"2020","source":"Fetal and pediatric pathology","url":"https://pubmed.ncbi.nlm.nih.gov/31997689","citation_count":3,"is_preprint":false},{"pmid":"34979615","id":"PMC_34979615","title":"[Identifications of the novel mutants on MYO7A in a family with non-syndromic hereditary deafness].","date":"2022","source":"Lin chuang er bi yan hou tou jing wai ke za zhi = Journal of clinical otorhinolaryngology head and neck surgery","url":"https://pubmed.ncbi.nlm.nih.gov/34979615","citation_count":3,"is_preprint":false},{"pmid":"34192699","id":"PMC_34192699","title":"Putative Digenic GJB2/MYO7A Inheritance of Hearing Loss Detected in a Patient with 48,XXYY Klinefelter Syndrome.","date":"2021","source":"Human heredity","url":"https://pubmed.ncbi.nlm.nih.gov/34192699","citation_count":3,"is_preprint":false},{"pmid":"10425080","id":"PMC_10425080","title":"Identification of three novel mutations in the MYO7A gene.","date":"1999","source":"Human mutation","url":"https://pubmed.ncbi.nlm.nih.gov/10425080","citation_count":3,"is_preprint":false},{"pmid":"40236041","id":"PMC_40236041","title":"Tonotopic Specialization of MYO7A Isoforms in Auditory Hair Cells.","date":"2025","source":"bioRxiv : the preprint server for biology","url":"https://pubmed.ncbi.nlm.nih.gov/40236041","citation_count":2,"is_preprint":false},{"pmid":"36630074","id":"PMC_36630074","title":"Identification of novel missense mutation related with non-syndromic sensorineural deafness, DFNA11 in korean family by NGS.","date":"2023","source":"Genes & genomics","url":"https://pubmed.ncbi.nlm.nih.gov/36630074","citation_count":2,"is_preprint":false}],"cost":{"stage1":{"model":"claude-sonnet-4-6","input_tokens":48623,"output_tokens":6312,"usd":0.120275,"stage1_stop_reason":"end_turn"},"stage2":{"model":"claude-opus-4-8","input_tokens":15051,"output_tokens":4257,"usd":0.09084,"stage2_stop_reason":"end_turn"},"total_usd":0.211115,"stage1_batch_id":"msgbatch_013a8chtv3AWyTqv4z4sEF4C","stage2_batch_id":"msgbatch_01AHsuW63vinsvuTgzmQ3n62","note":"batch pricing = 50% of standard"},"stage1_raw":"```json\n{\n  \"discoveries\": [\n    {\n      \"year\": 1997,\n      \"finding\": \"MYO7A (myosin-VIIA) mutations cause both Usher syndrome type 1B (syndromic deafness with retinitis pigmentosa and vestibular dysfunction) and isolated autosomal recessive deafness DFNB2, establishing that different mutations in the same gene produce syndromic vs. non-syndromic phenotypes. A G-to-A transition at the last nucleotide of exon 15 was identified, predicted to decrease splicing efficiency.\",\n      \"method\": \"Sequence analysis of coding exons, linkage analysis, mutation characterization in affected family\",\n      \"journal\": \"Nature genetics\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — mutation identification with splicing prediction, single study, linkage + sequencing\",\n      \"pmids\": [\"9171833\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2004,\n      \"finding\": \"A missense mutation (p.R853C) in the fifth IQ motif (IQ5) of MYO7A disrupts calmodulin (CaM) binding. Functional assay in smooth muscle cells showed wild-type IQ5 competes with myosin light chain kinase for CaM, but the p.R853C mutant IQ5 does not bind CaM constitutively, demonstrating that impaired CaM/MYO7A interaction causes autosomal dominant hearing loss (DFNA11).\",\n      \"method\": \"Expression of MYO7A IQ5-containing peptides in smooth muscle cells of microarteries; calmodulin-dependent vasoconstriction assay; functional competition assay\",\n      \"journal\": \"Human mutation\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — physiological cellular functional assay with controls, single lab, two methods (expression + vasoconstriction assay)\",\n      \"pmids\": [\"15300860\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2004,\n      \"finding\": \"A missense mutation (p.N458I) in the motor head domain of MYO7A predicted by molecular modeling (based on Dictyostelium myosin II crystal structure) to disrupt ATP/ADP binding and impair the myosin power-stroke, causing DFNA11 autosomal dominant hearing loss.\",\n      \"method\": \"Linkage analysis, MYO7A gene sequencing, molecular modeling of motor domain based on known myosin II crystal structure\",\n      \"journal\": \"Human genetics\",\n      \"confidence\": \"Low\",\n      \"confidence_rationale\": \"Tier 4 / Weak — molecular modeling only, no in vitro enzymatic or structural validation of the mutation's effect\",\n      \"pmids\": [\"15221449\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2006,\n      \"finding\": \"A missense mutation (p.A230V) in the motor domain of MYO7A causes autosomal dominant non-syndromic hearing loss (DFNA11). Molecular modeling of the myosin VIIA motor domain provided evidence for significant functional effect of the substitution.\",\n      \"method\": \"Genome-wide scan, MYO7A sequencing, molecular modeling of motor domain\",\n      \"journal\": \"Audiology & neuro-otology\",\n      \"confidence\": \"Low\",\n      \"confidence_rationale\": \"Tier 4 / Weak — molecular modeling only, no biochemical or cell-based functional assay\",\n      \"pmids\": [\"16449806\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2007,\n      \"finding\": \"MYO7A participates in the apical localization of melanosomes in retinal pigment epithelium (RPE) cells via a RAB27A-MYRIP-MYO7A complex. Live-cell imaging, fractionation, and mutant mouse analyses demonstrated that RAB27A provides an essential link to the melanosome, MYRIP associates with melanosomes via RAB27A, and that MYO7A functions in melanosome motility in the apical RPE.\",\n      \"method\": \"Live-cell imaging of primary RPE cells, RPE cell fractionation, analysis of mutant mice (Rab27a and Myo7a mutants), immunolocalization\",\n      \"journal\": \"Cell motility and the cytoskeleton\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — live imaging + fractionation + genetic mouse models (multiple orthogonal methods), replicated with multiple mutant strains\",\n      \"pmids\": [\"17352418\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2008,\n      \"finding\": \"USH1B/MYO7A disease pathology begins in photoreceptors (cell-autonomous), not in the adjacent RPE, as demonstrated by mosaic retinas in Myo7a-deficient shaker1 mice where mutant photoreceptor phenotype was cell-autonomous and not secondary to mutant RPE cells.\",\n      \"method\": \"Mosaic retina analysis in Myo7a-deficient shaker1 mice, optical imaging of human USH1B retinas, visual function testing\",\n      \"journal\": \"Human molecular genetics\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — mosaic mouse retina analysis, single lab, two complementary approaches (mouse and human imaging)\",\n      \"pmids\": [\"18463160\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2008,\n      \"finding\": \"A DFNB2 MYO7A allele (p.E1716del, three-nucleotide deletion in the tail domain) produces a protein that localizes correctly in transfected mouse hair cell stereocilia, unlike USH1B alleles which mislocalize. This demonstrates that DFNB2 alleles retain residual myosin VIIA function, explaining the less severe phenotype.\",\n      \"method\": \"GFP-tagged cDNA expression constructs in transfected mouse hair cells; fluorescence microscopy of stereociliary localization\",\n      \"journal\": \"Human mutation\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — direct protein localization assay in hair cells with engineered mutations and appropriate controls, single lab\",\n      \"pmids\": [\"18181211\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2009,\n      \"finding\": \"In Myo7a-null mouse RPE, melanosomes are mislocalized: fluorophores (melanosomes) are absent from apical processes of RPE, and NIR-autofluorescence (sourced from RPE and choroidal melanosomes) is abnormal in regions lacking photoreceptors in USH1B patients. This directly links MYO7A to melanosome localization in the apical RPE.\",\n      \"method\": \"Spectral deconvolution confocal microscopy of ex vivo mouse retinas, scanning laser ophthalmoscopy in USH1B patients, purified RPE melanosome spectral analysis\",\n      \"journal\": \"Investigative ophthalmology & visual science\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — ex vivo imaging + purified organelle analysis + in vivo imaging, single lab, multiple orthogonal methods\",\n      \"pmids\": [\"19324852\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2011,\n      \"finding\": \"MYO7A is required for the light-dependent translocation of RPE65 (the key retinoid cycle isomerase) to the central region of RPE cells. In Myo7a-mutant mice, RPE65 is mislocalized in the light and degraded more rapidly, resulting in lower RPE65 levels and a deficiency in retinoid cycle activity. MYO7A and RPE65 were co-immunoprecipitated from RPE cell lysate, suggesting a direct or indirect interaction.\",\n      \"method\": \"Immunofluorescence localization in Myo7a-mutant and wild-type mice, RPE65 protein level quantification, retinyl ester measurement after photobleach, co-immunoprecipitation from RPE cell lysate\",\n      \"journal\": \"Human molecular genetics\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — co-IP + localization + biochemical functional assay (retinoid cycle activity) + loss-of-function mouse, multiple orthogonal methods in one study\",\n      \"pmids\": [\"21493626\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2011,\n      \"finding\": \"MYO7A in photoreceptor cells functions as a selective barrier for membrane proteins at the distal end of the transition zone of the cilium: in cells lacking MYO7A, opsin accumulates abnormally in the transition zone, indicating MYO7A restricts opsin passage at this site.\",\n      \"method\": \"Immunolocalization of opsin in Myo7a-null mouse photoreceptors\",\n      \"journal\": \"Biochemical Society transactions\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 3 / Moderate — immunolocalization in knockout mice, replicated finding cited from prior work, single method in this review\",\n      \"pmids\": [\"21936790\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2011,\n      \"finding\": \"MYO7A participates in the removal of phagosomes from the apical RPE and their delivery to lysosomes in the basal RPE, functioning cooperatively with microtubule motors in this second role while competing with them in melanosome apical localization.\",\n      \"method\": \"Studies with MYO7A-null mice (phagosome localization analysis)\",\n      \"journal\": \"Biochemical Society transactions\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 3 / Moderate — loss-of-function mouse model, localization assay, single lab cited as established findings\",\n      \"pmids\": [\"21936790\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2013,\n      \"finding\": \"MYO7A motor domain mutation (p.R668H) significantly reduces actin-activated ATPase activity, demonstrating that the conserved R668 residue in the motor domain is required for ATPase function and that its disruption causes DFNA11 autosomal dominant hearing impairment.\",\n      \"method\": \"Actin-activated ATPase activity assay (NADH oxidation rate) comparing wild-type and p.R668H mutant MYO7A; molecular modeling\",\n      \"journal\": \"PloS one\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 1 / Moderate — in vitro enzymatic assay directly measuring ATPase activity, single lab with both enzymatic and structural modeling\",\n      \"pmids\": [\"23383098\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2016,\n      \"finding\": \"MYO7A forms a stable complex with PDZD7 (a paralog of USH1C and DFNB31) in stereocilia membrane fractions. MYO7A and PDZD7 interact in tissue-culture cells and co-localize to the ankle-link region of stereocilia in wild-type but not Myo7a mutant mice, establishing MYO7A as required for PDZD7 localization at the ankle link.\",\n      \"method\": \"Isolation of protein complexes from stereocilia membrane fractions, mass spectrometry quantification, co-localization in wild-type and Myo7a mutant mice, tissue-culture interaction assay\",\n      \"journal\": \"eLife\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — biochemical complex isolation from native tissue + MS identification + genetic validation in Myo7a mutant mice + tissue-culture interaction, multiple orthogonal methods\",\n      \"pmids\": [\"27525485\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2016,\n      \"finding\": \"The Drosophila ortholog of MYO7A (CRINKLED/CK) selectively interacts with the initiator caspase DRONC and acts as a substrate adaptor recruiting SHAGGY46/GSK3-β to DRONC, facilitating caspase-mediated cleavage and localized modulation of kinase activity. The mammalian MYO7A binds to and impinges on CASPASE-8, affecting RIPK1>CASPASE-8 signalling.\",\n      \"method\": \"Genetic loss-of-function in Drosophila (arista, border cells, wing disc), co-immunoprecipitation/interaction assays, caspase cleavage assay, mammalian MYO7A-CASPASE-8 binding assay\",\n      \"journal\": \"Nature communications\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — genetic epistasis in Drosophila + Co-IP in mammalian cells; the mammalian MYO7A-CASPASE-8 interaction is a single pulldown finding\",\n      \"pmids\": [\"26960254\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2016,\n      \"finding\": \"Genetic correction of a MYO7A mutation (c.4118C>T) in patient-derived iPSCs using CRISPR/Cas9 restored normal stereocilia-like protrusion organization and electrophysiological function in derived hair cell-like cells, confirming that MYO7A is required for proper stereociliary bundle assembly and hair cell function.\",\n      \"method\": \"CRISPR/Cas9 gene correction in patient iPSCs, differentiation to hair cell-like cells, morphological assessment of stereocilia, electrophysiological recording\",\n      \"journal\": \"Stem cells translational medicine\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — genetic rescue with functional readout (electrophysiology + morphology), single lab, isogenic correction controls\",\n      \"pmids\": [\"27013738\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2010,\n      \"finding\": \"An exonic missense mutation (c.1935G>A, p.M645I) at the last nucleotide of exon 16 enhances a pre-existing minor alternative splicing event, promoting exon 16 exclusion rather than full exon inclusion. This partial splicing impairment causes a less severe (atypical USH/mild retinopathy) phenotype than USH1B-associated alleles. Confirmed by hybrid minigene splicing assay.\",\n      \"method\": \"Endogenous lymphoid RNA analysis, splicing minigene transfection assay, structural prediction of molecular model\",\n      \"journal\": \"Molecular vision\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 1 / Moderate — minigene assay directly demonstrating splicing effect, single lab, two methods (endogenous RNA + minigene)\",\n      \"pmids\": [\"21031134\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2011,\n      \"finding\": \"Five putative splice-site mutations in MYO7A (c.2283-1G>T and c.5856G>A) and USH2A were shown by hybrid minigene assays to abolish consensus splice sites, producing exon skipping. This confirmed the pathogenic mechanism of these variants as loss of normal splicing.\",\n      \"method\": \"Hybrid minigene splicing assay, bioinformatic splice site prediction\",\n      \"journal\": \"Clinical genetics\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 1 / Moderate — in vitro minigene functional assay for splicing, single lab, directly demonstrates mechanism\",\n      \"pmids\": [\"20497194\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2025,\n      \"finding\": \"Postnatal deletion of Myo7a in cochlear hair cells causes progressive decline in MET current amplitude and hair-bundle stiffness without initially affecting hearing function or resting open probability (Po) of MET channels. This demonstrates MYO7A is essential for structural integrity of hair bundles and MET current magnitude in mature hair cells, but mature hair cells use a MYO7A-independent mechanism to maintain resting MET channel Po. Myo7a deficiency also increased vulnerability to sound-induced damage and downregulated stereociliary genes.\",\n      \"method\": \"Postnatal conditional deletion of Myo7a (Cre-mediated), electrophysiology (MET current recording), hair-bundle stiffness measurement, noise exposure, RNA-sequencing\",\n      \"journal\": \"Proceedings of the National Academy of Sciences of the United States of America\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 / Strong — conditional KO + electrophysiology + mechanical measurements + transcriptomics, multiple orthogonal methods in one study\",\n      \"pmids\": [\"39746042\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2024,\n      \"finding\": \"In vivo AAV9-Myo7a gene rescue in shaker-1 (Myo7a mutant) mice restores IHC function, reestablishes normal adult IHC synaptic profile (eliminating ectopic lateral olivocochlear efferent axosomatic contacts with IHCs), and improves hearing thresholds. This demonstrates that ectopic efferent plasticity in the adult cochlea results directly from MET current dysfunction caused by Myo7a mutation.\",\n      \"method\": \"AAV9-mediated gene delivery, auditory brainstem response (hearing threshold measurement), morphological synaptic analysis (confocal immunofluorescence), mechanoelectrical transducer current recording\",\n      \"journal\": \"JCI insight\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — gene rescue in vivo + functional (electrophysiology + hearing thresholds) + structural (synapse morphology) readouts, multiple orthogonal methods\",\n      \"pmids\": [\"39641274\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2025,\n      \"finding\": \"Two MYO7A isoforms (MYO7A-C and MYO7A-N) are expressed in auditory hair cells with opposing tonotopic gradients in OHCs (IHCs primarily express MYO7A-C). Both isoforms localize to the upper tip-link insertion site. Loss of MYO7A-N leads to OHC degeneration and progressive hearing loss. Cryo-EM structures reveal isoform-specific differences at actomyosin interfaces correlating with distinct ATPase activities, suggesting isoform specialization tunes tip-link tension.\",\n      \"method\": \"Isoform-specific knock-in mice, cryo-EM structural determination, ATPase activity assay, immunolocalization, auditory function testing\",\n      \"journal\": \"bioRxiv\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 / Strong — cryo-EM structure + biochemical ATPase assay + genetic knock-in mouse with functional phenotype, multiple orthogonal methods in one study\",\n      \"pmids\": [\"40236041\"],\n      \"is_preprint\": true\n    },\n    {\n      \"year\": 2025,\n      \"finding\": \"AAV-mediated rescue of Myo7a in newborn shaker-1 mice substantially rescues IHC hair bundle structure and restores mechanoelectrical transducer (MET) currents, including normal resting open probability of MET channels, and mature basolateral membrane current profile. Rescue of IHC (but not OHC) function produces 20-30 dB improvement in hearing thresholds, demonstrating MYO7A is essential for IHC stereocilia mechanotransduction and maturation.\",\n      \"method\": \"Dual-AAV8 and dual-AAV9 gene delivery in Myo7aSh1/Sh1 mice, MET current electrophysiology, auditory brainstem response, fluid-jet hair bundle stimulation\",\n      \"journal\": \"The Journal of physiology\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 / Strong — gene rescue + electrophysiology (MET currents + basolateral currents) + hearing threshold measurement, multiple orthogonal methods\",\n      \"pmids\": [\"41015536\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2004,\n      \"finding\": \"A Myo7a motor domain missense mutation (I178F) in headbanger mice causes abnormal stereocilia bundle development (more severe in apex than base, with long thin wispy utricular stereocilia) and reduced myosin VIIa protein levels in the inner ear, demonstrating a role for the MYO7A motor domain in stereocilia bundle morphogenesis.\",\n      \"method\": \"ENU mutagenesis screen, scanning electron microscopy of organ of Corti and utricle, protein expression analysis, auditory threshold testing\",\n      \"journal\": \"Mammalian genome\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — mouse mutant with defined point mutation, SEM morphology + protein quantification + hearing function, single lab\",\n      \"pmids\": [\"15389316\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2023,\n      \"finding\": \"Two major MYO7A isoforms (IF1 and IF2) are both expressed in RPE and neural retina, with IF2 approximately 7-fold more abundant than IF1. 3D modeling shows the 38-amino-acid region unique to IF1 affects the C lobe of the FERM1 domain and the opening of a cleft in this protein-binding domain, suggesting isoform-specific protein-binding differences.\",\n      \"method\": \"qPCR quantification of isoform expression in RPE and neural retina (pig, mouse, human), 3D molecular modeling of isoforms\",\n      \"journal\": \"Vision research\",\n      \"confidence\": \"Low\",\n      \"confidence_rationale\": \"Tier 4 / Weak — expression quantification and computational modeling only, no direct functional validation of isoform-specific interactions\",\n      \"pmids\": [\"37586294\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2010,\n      \"finding\": \"Loss of harmonin (USH1C) in Ush1c knockout mice does not affect the cytoplasmic distribution of Myo7a in cochlear hair cells (Myo7a remains normally distributed throughout the cytoplasm), but does cause mislocalization of Pcdh15 and Sans, indicating Myo7a localization is independent of harmonin.\",\n      \"method\": \"Immunofluorescence of cochlear sections and whole-mount preparations from Ush1c(-/-) knockout mice\",\n      \"journal\": \"International journal of experimental pathology\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — direct localization in knockout mouse with specific protein readout, single lab\",\n      \"pmids\": [\"21156003\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2022,\n      \"finding\": \"A synonymous variant (c.2904G>A, p.Glu968=) in MYO7A exon 23 causes exon 23 skipping and produces a truncated protein, confirmed by in vitro minigene splicing assay. This establishes a mechanistic basis for DFNB2 through a synonymous (silent) exonic variant affecting splicing.\",\n      \"method\": \"Targeted next-generation sequencing, Sanger sequencing, minigene splicing assay\",\n      \"journal\": \"Journal of clinical laboratory analysis\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 1 / Moderate — minigene assay directly demonstrates splicing disruption, single lab\",\n      \"pmids\": [\"36164746\"],\n      \"is_preprint\": false\n    }\n  ],\n  \"current_model\": \"MYO7A encodes an unconventional actin-based motor (myosin VIIA) that is essential for the structural integrity and mechanotransduction function of stereociliary bundles in cochlear and vestibular hair cells, where it localizes to the upper tip-link insertion site, maintains MET current amplitude and hair-bundle stiffness through two tonotopically specialized isoforms with distinct ATPase activities, and in the RPE drives apical melanosome localization via a RAB27A-MYRIP-MYO7A complex, facilitates phagosome trafficking from apical to basal RPE, and mediates light-dependent translocation of the visual cycle enzyme RPE65 through a direct or indirect interaction; loss-of-function mutations across the motor domain, IQ (calmodulin-binding) motifs, and tail domain cause a spectrum of deafness/blindness disorders (USH1B, DFNB2, DFNA11) depending on the degree of residual protein function and correct subcellular localization.\"\n}\n```","stage2_raw":"```json\n{\n  \"mechanistic_narrative\": \"MYO7A encodes an unconventional actin-based motor (myosin VIIA) that is essential for the structural integrity and mechanotransduction of cochlear and vestibular hair-cell stereociliary bundles and for melanosome and visual-cycle protein trafficking in the retinal pigment epithelium [#17, #4]. In hair cells, MYO7A localizes to the upper tip-link insertion site and sustains mechanoelectrical transducer (MET) current amplitude and hair-bundle stiffness, while its motor domain drives proper stereocilia bundle morphogenesis and assembly [#17, #21, #14]; gene-replacement of mutant Myo7a in vivo restores MET currents, normal resting channel open probability, hair-bundle structure, and hearing thresholds, establishing that the cochlear phenotype is a direct, reversible consequence of motor dysfunction [#20, #18]. Two tonotopically distributed isoforms with isoform-specific actomyosin interfaces and distinct ATPase activities tune tip-link tension, and motor-domain residues such as R668 are required for actin-activated ATPase activity [#19, #11]. MYO7A also organizes the stereociliary scaffold by forming a stable complex with PDZD7 and is required for PDZD7 localization to the ankle-link region [#12]. In the RPE, MYO7A operates within a RAB27A–MYRIP–MYO7A complex to drive apical melanosome localization, participates in phagosome transport from apical to basal RPE, and is required for light-dependent translocation of the visual-cycle isomerase RPE65, with which it co-immunoprecipitates [#4, #10, #8]; in photoreceptors it acts cell-autonomously and functions as a selective barrier restricting opsin passage at the ciliary transition zone [#5, #9]. Mutations spanning the motor domain, IQ/calmodulin-binding motifs, and tail domain, as well as splice- and synonymous-variant–induced exon skipping, cause a phenotypic spectrum of Usher syndrome type 1B, recessive deafness DFNB2, and dominant deafness DFNA11, graded by residual motor function and correct subcellular localization [#0, #1, #6, #24].\",\n  \"teleology\": [\n    {\n      \"year\": 1997,\n      \"claim\": \"Established that MYO7A is a disease gene and that allelic heterogeneity produces distinct clinical outcomes, framing the question of how different mutations yield syndromic versus non-syndromic disease.\",\n      \"evidence\": \"Linkage and coding-exon sequencing in families with Usher syndrome 1B and isolated deafness DFNB2\",\n      \"pmids\": [\"9171833\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Did not establish the protein's molecular activity or subcellular site of action\", \"Splicing prediction not functionally tested\"]\n    },\n    {\n      \"year\": 2004,\n      \"claim\": \"Linked specific MYO7A domains to dominant deafness mechanisms — disrupted calmodulin binding at IQ5 and predicted impairment of the motor power-stroke — beginning to map genotype to molecular defect.\",\n      \"evidence\": \"Calmodulin-competition/vasoconstriction assay for the IQ5 p.R853C mutant; molecular modeling of motor-domain mutations p.N458I and p.A230V\",\n      \"pmids\": [\"15300860\", \"15221449\", \"16449806\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Motor-domain effects rested on modeling only, without enzymatic validation\", \"Did not address how CaM loss alters motor mechanics in hair cells\"]\n    },\n    {\n      \"year\": 2004,\n      \"claim\": \"Connected the MYO7A motor domain directly to stereocilia bundle morphogenesis in vivo, showing a point mutation alters bundle development and reduces protein levels.\",\n      \"evidence\": \"ENU-derived headbanger mouse (I178F): SEM of organ of Corti and utricle, protein quantification, auditory thresholds\",\n      \"pmids\": [\"15389316\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Did not resolve whether the defect is loss of motor activity or protein instability\", \"Molecular partners at the bundle not identified\"]\n    },\n    {\n      \"year\": 2007,\n      \"claim\": \"Defined a molecular machine for RPE melanosome transport, placing MYO7A as the actin motor downstream of a RAB27A–MYRIP membrane-recruitment module.\",\n      \"evidence\": \"Live-cell imaging, fractionation, and Rab27a/Myo7a mutant mouse analysis of primary RPE\",\n      \"pmids\": [\"17352418\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Direct biochemical reconstitution of the tripartite complex not shown\", \"Mechanism coordinating actin and microtubule transport unresolved\"]\n    },\n    {\n      \"year\": 2008,\n      \"claim\": \"Resolved the cellular origin of USH1B retinal disease and the basis of DFNB2 mildness — photoreceptor pathology is cell-autonomous, and DFNB2 alleles retain function by localizing correctly.\",\n      \"evidence\": \"Mosaic shaker1 retina analysis and human imaging; GFP-tagged DFNB2 vs USH1B allele localization in transfected hair cells\",\n      \"pmids\": [\"18463160\", \"18181211\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Did not quantify residual motor activity of DFNB2 alleles\", \"Cell-autonomous mechanism in photoreceptors not molecularly defined\"]\n    },\n    {\n      \"year\": 2009,\n      \"claim\": \"Provided in vivo confirmation that MYO7A is required for apical melanosome positioning in RPE, linking the motor to organelle distribution detectable by clinical imaging.\",\n      \"evidence\": \"Spectral confocal of ex vivo mouse retina, purified RPE melanosome analysis, in vivo scanning laser ophthalmoscopy in patients\",\n      \"pmids\": [\"19324852\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Functional consequence of melanosome mislocalization for vision not established here\"]\n    },\n    {\n      \"year\": 2011,\n      \"claim\": \"Expanded MYO7A's RPE roles to visual-cycle regulation, photoreceptor ciliary gating, and phagosome clearance, broadening its function beyond melanosome motility.\",\n      \"evidence\": \"RPE65 co-IP, localization, retinoid measurements, and opsin/phagosome localization in Myo7a-null mice\",\n      \"pmids\": [\"21493626\", \"21936790\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"RPE65 interaction not resolved as direct vs indirect\", \"Mechanism of the transition-zone barrier function unknown\"]\n    },\n    {\n      \"year\": 2013,\n      \"claim\": \"Provided the first direct enzymatic evidence that a DFNA11 motor-domain mutation impairs catalytic activity, validating earlier modeling predictions.\",\n      \"evidence\": \"Actin-activated ATPase (NADH oxidation) assay comparing wild-type and p.R668H MYO7A\",\n      \"pmids\": [\"23383098\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Single mutation tested; not linked to in vivo bundle mechanics\", \"Dominant-negative mechanism not demonstrated\"]\n    },\n    {\n      \"year\": 2016,\n      \"claim\": \"Identified MYO7A as a scaffolding organizer in stereocilia, required to localize PDZD7 to the ankle-link region, and uncovered a conserved non-sensory role in caspase signaling.\",\n      \"evidence\": \"Stereocilia complex isolation + MS + Myo7a-mutant co-localization for PDZD7; Drosophila genetics and mammalian Co-IP for caspase interactions\",\n      \"pmids\": [\"27525485\", \"26960254\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Mammalian MYO7A–CASPASE-8 interaction rests on a single pulldown\", \"Physiological relevance of the caspase-adaptor role in mammals untested\"]\n    },\n    {\n      \"year\": 2016,\n      \"claim\": \"Demonstrated causality and reversibility at the cellular level by correcting a patient MYO7A mutation and restoring stereocilia organization and electrophysiology in iPSC-derived hair cells.\",\n      \"evidence\": \"CRISPR/Cas9 isogenic correction in patient iPSCs, hair-cell differentiation, morphology, electrophysiology\",\n      \"pmids\": [\"27013738\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"In vitro hair-cell-like cells may not fully model mature cochlear hair cells\"]\n    },\n    {\n      \"year\": 2025,\n      \"claim\": \"Defined MYO7A's role in mature hair cells and established isoform specialization — distinct tonotopic isoforms with different ATPase activities tune tip-link tension, while MYO7A sustains MET current and bundle stiffness but is dispensable for resting channel open probability.\",\n      \"evidence\": \"Postnatal conditional KO with electrophysiology, stiffness, RNA-seq; isoform-specific knock-in mice with cryo-EM structures and ATPase assays\",\n      \"pmids\": [\"39746042\", \"40236041\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Identity of the MYO7A-independent mechanism maintaining resting MET Po unknown\", \"Isoform structural study is a preprint awaiting peer review\"]\n    },\n    {\n      \"year\": 2025,\n      \"claim\": \"Established therapeutic proof-of-concept by showing AAV-delivered MYO7A restores IHC bundle structure, MET currents with normal resting open probability, and hearing, and that ectopic efferent plasticity is a direct downstream consequence of MET dysfunction.\",\n      \"evidence\": \"Dual-AAV gene delivery in shaker-1 mice with MET electrophysiology, ABR thresholds, fluid-jet stimulation, and synaptic morphology\",\n      \"pmids\": [\"41015536\", \"39641274\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"OHC function not rescued, limiting threshold recovery\", \"Durability and translatability of rescue not established\"]\n    },\n    {\n      \"year\": null,\n      \"claim\": \"How MYO7A motor mechanics, isoform-specific ATPase tuning, and its scaffolding interactions integrate to set tip-link tension and mechanotransduction in vivo, and how its distinct RPE trafficking roles are coordinated, remain incompletely resolved.\",\n      \"evidence\": \"\",\n      \"pmids\": [],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"No integrated model linking isoform ATPase rates to measured tip-link tension in vivo\", \"Direct vs indirect nature of the RPE65 interaction unresolved\", \"Mechanism coordinating actin- and microtubule-based RPE transport unknown\"]\n    }\n  ],\n  \"mechanism_profile\": {\n    \"molecular_activity\": [\n      {\"term_id\": \"GO:0140657\", \"supporting_discovery_ids\": [11, 19]},\n      {\"term_id\": \"GO:0003774\", \"supporting_discovery_ids\": [17, 21]},\n      {\"term_id\": \"GO:0008092\", \"supporting_discovery_ids\": [11, 19]},\n      {\"term_id\": \"GO:0060090\", \"supporting_discovery_ids\": [12, 4]}\n    ],\n    \"localization\": [\n      {\"term_id\": \"GO:0005856\", \"supporting_discovery_ids\": [17, 19, 12]},\n      {\"term_id\": \"GO:0005929\", \"supporting_discovery_ids\": [9]},\n      {\"term_id\": \"GO:0005829\", \"supporting_discovery_ids\": [23, 4]}\n    ],\n    \"pathway\": [\n      {\"term_id\": \"GO:0009609507\", \"supporting_discovery_ids\": []}\n    ],\n    \"complexes\": [\n      \"RAB27A-MYRIP-MYO7A melanosome transport complex\",\n      \"MYO7A-PDZD7 ankle-link complex\"\n    ],\n    \"partners\": [\n      \"PDZD7\",\n      \"RAB27A\",\n      \"MYRIP\",\n      \"RPE65\",\n      \"CALM1\",\n      \"CASP8\"\n    ],\n    \"other_free_text\": []\n  }\n}\n```","audit_flag":null,"evaluation":{"pairwise":"win","faith_supported":6,"faith_total":6,"faith_pct":100.0}}