{"gene":"LOXHD1","run_date":"2026-06-10T02:59:50","timeline":{"discoveries":[{"year":2009,"finding":"LOXHD1 consists entirely of PLAT (polycystin/lipoxygenase/alpha-toxin) domains and is expressed along the membrane of mature hair cell stereocilia. In samba mice carrying an ENU-induced Loxhd1 mutation, stereociliary development is unaffected but hair cell function is perturbed and hair cells eventually degenerate, establishing LOXHD1 as required for hair cell function rather than stereociliary morphogenesis.","method":"ENU mutagenesis mouse model, immunolocalization, hair cell physiology, genetic linkage in human families","journal":"American journal of human genetics","confidence":"High","confidence_rationale":"Tier 2 / Strong — in vivo mouse model with defined cellular phenotype (hair cell dysfunction/degeneration), direct protein localization, and replicated in human genetics; multiple orthogonal methods in one study","pmids":["19732867"],"is_preprint":false},{"year":2021,"finding":"LOXHD1 is required for mechanotransduction in cochlear inner hair cells (IHCs), but only after the first postnatal week, coinciding with its postnatal expression/localization along the stereocilia. In two Loxhd1 mouse models bearing mutations in the 10th PLAT repeat, mechanotransduction currents in IHCs were severely reduced by postnatal day 11 without morphological defects to the hair bundle or reduction in tip-link number. Harmonin and LHFPL5 (upper and lower tip-link complex proteins) were maintained in their correct locations in the mutants, indicating that the mechanotransduction machinery is present but not activatable.","method":"Loxhd1 knock-in mouse models (two alleles), electrophysiology (mechanotransduction current recording), immunolocalization of tip-link complex proteins","journal":"The Journal of neuroscience","confidence":"High","confidence_rationale":"Tier 2 / Strong — two independent mouse models, electrophysiology with defined phenotype, immunolocalization of multiple pathway components, multiple orthogonal methods in one study","pmids":["33707295"],"is_preprint":false},{"year":2024,"finding":"LOXHD1 is essential for maintaining TMC1 (pore-forming subunit of mature auditory mechanosensitive channels) at the tip-link insertion site in stereocilia. Using SUB-immunogold-SEM, TMC1 was shown to localize within 100 nm of the tip link in wild-type mice but mislocalizes away from the force transmission site in the absence of LOXHD1. LOXHD1 selectively interacts in vitro with TMC1 (but not its developmental paralogue TMC2), and also binds channel subunits CIB2 and LHFPL5, and tip-link protein PCDH15. TMC2-driven developmental channels do not require LOXHD1 for tip-link coupling.","method":"Mouse knockout models, SUB-immunogold scanning electron microscopy (novel method for submembranous epitopes), in vitro binding assays (selective interaction of LOXHD1 with TMC1 but not TMC2), immunolocalization","journal":"Nature communications","confidence":"High","confidence_rationale":"Tier 1-2 / Strong — novel structural/ultrastructural method (SUB-immunogold-SEM) combined with in vitro binding assays and mouse KO, multiple orthogonal methods establishing mechanism in a single rigorous study","pmids":["39256406"],"is_preprint":false},{"year":2024,"finding":"Preprint corroborating the peer-reviewed finding (PMID 39256406): LOXHD1 is indispensable for coupling TMC1-containing auditory mechanosensitive channels to the tip-link force transmission site; LOXHD1 interacts selectively with TMC1 but not TMC2 in vitro, and also binds CIB2, LHFPL5, and PCDH15. TMC1 is present but mislocalized in hair bundles lacking LOXHD1.","method":"Mouse models, SUB-immunogold-SEM, in vitro interaction assays","journal":"Research square (preprint)","confidence":"Medium","confidence_rationale":"Tier 1-2 / Moderate — preprint version of the same study as PMID 39256406; data appear identical; confidence limited to Medium for the preprint form","pmids":["38260480"],"is_preprint":true},{"year":2012,"finding":"Missense mutations in LOXHD1 cause dominant late-onset Fuchs corneal dystrophy (FCD). LOXHD1 protein is detected by antibody staining in human and mouse corneal epithelium and endothelium. Expression of familial and sporadic LOXHD1 mutant alleles in cultured cells produced prominent cytoplasmic protein aggregates, paralleling the punctate endothelial staining seen in corneas of patients with causal LOXHD1 mutations but absent in normal or mutation-negative FCD corneas. In silico analysis predicted mutations to reside on the protein surface and affect protein-protein interactions.","method":"Next-generation sequencing of FCD pedigree, antibody staining of human and mouse corneas, mutant allele expression in cell culture (aggregation assay), in silico structural modeling","journal":"American journal of human genetics","confidence":"Medium","confidence_rationale":"Tier 3 / Moderate — cell culture expression assay shows aggregate formation, antibody localization in tissue; causal role in FCD remains contested by later systematic reviews; single lab with two orthogonal methods","pmids":["22341973"],"is_preprint":false},{"year":2016,"finding":"Molecular modeling of the PLAT domain of LOXHD1 predicted that the missense mutation p.V1892F distorts the domain structure and would decrease the protein's affinity for the lipid membrane, consistent with a mechanism by which PLAT domain integrity is required for LOXHD1 membrane association and hair cell function.","method":"In silico 3D molecular modeling (SWISS-MODEL) of PLAT domain","journal":"Auris, nasus, larynx","confidence":"Low","confidence_rationale":"Tier 4 / Weak — computational prediction only, no experimental validation of membrane binding","pmids":["26973026"],"is_preprint":false},{"year":2022,"finding":"In Ewing sarcoma, the oncofusion EWSR1::FLI1 transcription factor drives aberrant expression of a short LOXHD1 isoform via de novo enhancers upstream of an alternative transcription start site. Deletion or silencing of this EWSR1::FLI1-bound enhancer results in loss of the LOXHD1 short isoform, altered EWSR1::FLI1 and HIF1α pathway gene expression, and decreased proliferation and invasion of EwS cells.","method":"Integrative transcriptomic analysis, enhancer deletion/silencing, functional assays (proliferation, invasion) in EwS cell lines","journal":"Cell reports","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — enhancer deletion with defined cellular phenotype, pathway gene expression changes; single lab but multiple functional readouts","pmids":["35705030"],"is_preprint":false},{"year":2025,"finding":"LOXHD1 protein expression is highly restricted to inner hair cells of the cochlea, adult testis, and Ewing sarcoma tumor cells. LOXHD1-specific TCR-engineered CD8+ T cells (targeting HLA-A*02:01-restricted LOXHD1 epitopes) conferred cytotoxic activity against HLA-A*02:01+ EwS tumor cell lines in vitro, and adoptive transfer led to tumor eradication in a mouse xenograft model of EwS, confirming surface/immunogenic protein expression in EwS.","method":"Proteomics/immunogenicity assays, TCR isolation, TCR-T cell engineering, in vitro cytotoxicity assay, mouse xenograft adoptive transfer","journal":"Scientific reports","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — in vitro and in vivo functional validation of LOXHD1 as an immunogenic surface-accessible antigen in EwS; single lab, multiple orthogonal methods","pmids":["40234527"],"is_preprint":false}],"current_model":"LOXHD1 is a multi-PLAT-domain protein that localizes along the membrane of mature cochlear hair cell stereocilia where it is required for auditory mechanotransduction: specifically, LOXHD1 maintains the pore-forming channel subunit TMC1—but not its developmental paralogue TMC2—at the tip-link force-transmission site by selectively interacting with TMC1, CIB2, LHFPL5, and the tip-link protein PCDH15; loss of LOXHD1 mislocalizes TMC1, abolishes mature mechanotransduction currents, and leads to progressive hair cell degeneration and hereditary deafness (DFNB77), while in Ewing sarcoma the EWSR1::FLI1 oncofusion drives aberrant expression of a short LOXHD1 isoform via de novo enhancers that promotes tumor proliferation and invasion."},"narrative":{"mechanistic_narrative":"LOXHD1 is a PLAT (polycystin/lipoxygenase/alpha-toxin) domain protein that localizes along the membrane of mature cochlear hair cell stereocilia and is required for auditory mechanotransduction rather than for stereociliary morphogenesis [PMID:19732867]. Its function is developmentally gated: LOXHD1 is dispensable for hair bundle assembly and tip-link formation but becomes essential for inner hair cell mechanotransduction after the first postnatal week, coinciding with its postnatal stereociliary expression [PMID:19732867, PMID:33707295]. Mechanistically, LOXHD1 maintains the pore-forming subunit TMC1 at the tip-link force-transmission site: in its absence the mechanotransduction machinery (including harmonin, LHFPL5, and intact tip links) is present but TMC1 mislocalizes away from the tip-link insertion point and currents are abolished [PMID:33707295, PMID:39256406]. LOXHD1 interacts selectively in vitro with TMC1 but not its developmental paralogue TMC2, and binds the channel subunits CIB2 and LHFPL5 and the tip-link protein PCDH15, explaining why TMC2-driven developmental channels do not require LOXHD1 for tip-link coupling [PMID:39256406]. Beyond the cochlea, the EWSR1::FLI1 oncofusion drives aberrant expression of a short LOXHD1 isoform via de novo enhancers, and this isoform supports Ewing sarcoma proliferation and invasion [PMID:35705030]; LOXHD1 is also an immunogenic, surface-accessible antigen in Ewing sarcoma exploitable by TCR-engineered T cells [PMID:40234527].","teleology":[{"year":2009,"claim":"Established that LOXHD1 is required for hair cell function and survival rather than for building the stereocilia, distinguishing a maintenance/activation role from a morphogenetic one.","evidence":"ENU-mutant samba mice with immunolocalization, hair cell physiology, and human family linkage","pmids":["19732867"],"confidence":"High","gaps":["Molecular function of the PLAT domains not defined","No interacting partners identified","Mechanism of hair cell degeneration unresolved"]},{"year":2021,"claim":"Showed LOXHD1's requirement is developmentally gated to mechanotransduction after the first postnatal week, with the channel machinery present but non-activatable, narrowing its role to channel function rather than complex assembly.","evidence":"Two Loxhd1 knock-in mouse alleles (10th PLAT repeat), mechanotransduction current recording, immunolocalization of harmonin and LHFPL5","pmids":["33707295"],"confidence":"High","gaps":["Did not identify which channel subunit LOXHD1 acts on","Direct binding partners not established","Mechanism by which channels become activatable unknown"]},{"year":2024,"claim":"Defined the molecular mechanism: LOXHD1 selectively retains TMC1 at the tip-link force-transmission site through direct interactions, explaining the paralogue-specific (TMC1 vs TMC2) and developmentally gated requirement.","evidence":"Mouse knockouts, SUB-immunogold-SEM for submembranous TMC1 localization, in vitro binding assays (TMC1, CIB2, LHFPL5, PCDH15)","pmids":["39256406","38260480"],"confidence":"High","gaps":["Structural basis of selective TMC1 vs TMC2 binding not resolved","Stoichiometry and architecture of the LOXHD1-channel complex unknown","Whether LOXHD1 also gates the channel mechanically vs only localizing it is unresolved"]},{"year":2022,"claim":"Extended LOXHD1 biology beyond the cochlea by showing a short isoform is an EWSR1::FLI1 transcriptional output that promotes tumor proliferation and invasion in Ewing sarcoma.","evidence":"Integrative transcriptomics, enhancer deletion/silencing, proliferation and invasion assays in EwS cell lines","pmids":["35705030"],"confidence":"Medium","gaps":["Molecular function of the short LOXHD1 isoform in tumor cells unknown","Whether the short isoform shares the stereociliary mechanism is unaddressed","Single-lab functional characterization"]},{"year":2012,"claim":"Linked LOXHD1 missense mutations to dominant late-onset Fuchs corneal dystrophy via a mutant-aggregation phenotype, implicating protein-protein interaction surfaces.","evidence":"NGS of FCD pedigree, corneal antibody staining, mutant allele expression aggregation assay, in silico modeling","pmids":["22341973"],"confidence":"Medium","gaps":["Causal role in FCD contested by later systematic reviews","Aggregation mechanism not tied to a defined corneal function","Single-lab evidence"]},{"year":2025,"claim":"Demonstrated LOXHD1 is an immunogenic, surface-accessible antigen restricted to hair cells, testis, and Ewing sarcoma, enabling targeted T-cell killing of tumor cells.","evidence":"Proteomics/immunogenicity assays, TCR-engineered CD8+ T cells, in vitro cytotoxicity, mouse xenograft adoptive transfer","pmids":["40234527"],"confidence":"Medium","gaps":["Topology/orientation explaining surface accessibility not directly resolved","On-target off-tumor risk in testis/cochlea not addressed","Single-lab study"]},{"year":null,"claim":"How LOXHD1's PLAT domains achieve selective TMC1 recognition and whether LOXHD1 contributes to channel gating beyond localization remains unresolved.","evidence":"No structural or reconstitution study in the corpus resolves the LOXHD1-channel interface or gating contribution","pmids":[],"confidence":"High","gaps":["No high-resolution structure of LOXHD1 or its channel complex","Functional role of the short tumor isoform mechanistically uncharacterized","Membrane-binding mechanism of PLAT domains experimentally unvalidated"]}],"mechanism_profile":{"molecular_activity":[{"term_id":"GO:0140096","term_label":"catalytic activity, acting on a protein","supporting_discovery_ids":[2]},{"term_id":"GO:0060090","term_label":"molecular adaptor activity","supporting_discovery_ids":[2]},{"term_id":"GO:0008289","term_label":"lipid binding","supporting_discovery_ids":[0]}],"localization":[{"term_id":"GO:0005886","term_label":"plasma membrane","supporting_discovery_ids":[0,1]},{"term_id":"GO:0005856","term_label":"cytoskeleton","supporting_discovery_ids":[0]}],"pathway":[{"term_id":"R-HSA-112316","term_label":"Neuronal System","supporting_discovery_ids":[0,1,2]},{"term_id":"R-HSA-9709957","term_label":"Sensory Perception","supporting_discovery_ids":[0,2]}],"complexes":[],"partners":["TMC1","CIB2","LHFPL5","PCDH15"],"other_free_text":[]}},"prefetch_data":{"uniprot":{"accession":"Q8IVV2","full_name":"Lipoxygenase homology domain-containing protein 1","aliases":[],"length_aa":2067,"mass_kda":235.7,"function":"Involved in hearing. Required for normal function of hair cells in the inner ear (By similarity)","subcellular_location":"Cell projection, stereocilium","url":"https://www.uniprot.org/uniprotkb/Q8IVV2/entry"},"depmap":{"release":"DepMap","has_data":true,"is_common_essential":false,"resolved_as":"","url":"https://depmap.org/portal/gene/LOXHD1","classification":"Not Classified","n_dependent_lines":0,"n_total_lines":1208,"dependency_fraction":0.0},"opencell":{"profiled":false,"resolved_as":"","ensg_id":"","cell_line_id":"","localizations":[],"interactors":[],"url":"https://opencell.sf.czbiohub.org/search/LOXHD1","total_profiled":1310},"omim":[{"mim_id":"613267","title":"CORNEAL DYSTROPHY, FUCHS ENDOTHELIAL, 3; FECD3","url":"https://www.omim.org/entry/613267"},{"mim_id":"613079","title":"DEAFNESS, AUTOSOMAL RECESSIVE 77; DFNB77","url":"https://www.omim.org/entry/613079"},{"mim_id":"613072","title":"LIPOXYGENASE HOMOLOGY DOMAIN-CONTAINING 1; LOXHD1","url":"https://www.omim.org/entry/613072"}],"hpa":{"profiled":true,"resolved_as":"","reliability":"Approved","locations":[{"location":"Plasma membrane","reliability":"Approved"}],"tissue_specificity":"Tissue enhanced","tissue_distribution":"Detected in some","driving_tissues":[{"tissue":"epididymis","ntpm":6.8},{"tissue":"testis","ntpm":21.5}],"url":"https://www.proteinatlas.org/search/LOXHD1"},"hgnc":{"alias_symbol":["FLJ32670","LH2D1"],"prev_symbol":["DFNB77"]},"alphafold":{"accession":"Q8IVV2","domains":[{"cath_id":"2.60.60.20","chopping":"33-161","consensus_level":"high","plddt":86.0291,"start":33,"end":161},{"cath_id":"2.60.60.20","chopping":"172-293","consensus_level":"medium","plddt":85.0107,"start":172,"end":293},{"cath_id":"2.60.60.20","chopping":"296-422","consensus_level":"medium","plddt":83.6656,"start":296,"end":422},{"cath_id":"2.60.60.20","chopping":"426-543","consensus_level":"high","plddt":87.3897,"start":426,"end":543},{"cath_id":"2.60.60.20","chopping":"552-682","consensus_level":"medium","plddt":84.7783,"start":552,"end":682},{"cath_id":"2.60.60.20","chopping":"684-811","consensus_level":"medium","plddt":83.0605,"start":684,"end":811},{"cath_id":"2.60.60.20","chopping":"820-941","consensus_level":"high","plddt":78.312,"start":820,"end":941},{"cath_id":"2.60.60.20","chopping":"968-1096","consensus_level":"high","plddt":84.6041,"start":968,"end":1096},{"cath_id":"2.60.60.20","chopping":"1100-1130_1138-1247","consensus_level":"medium","plddt":84.2991,"start":1100,"end":1247},{"cath_id":"2.60.60.20","chopping":"1388-1550","consensus_level":"medium","plddt":80.1947,"start":1388,"end":1550},{"cath_id":"2.60.60.20","chopping":"1551-1677","consensus_level":"medium","plddt":87.8272,"start":1551,"end":1677},{"cath_id":"2.60.60.20","chopping":"1678-1802","consensus_level":"medium","plddt":90.2482,"start":1678,"end":1802},{"cath_id":"2.60.60.20","chopping":"1810-1942","consensus_level":"high","plddt":84.6417,"start":1810,"end":1942},{"cath_id":"2.60.60.20","chopping":"1947-2067","consensus_level":"medium","plddt":87.1479,"start":1947,"end":2067}],"viewer_url":"https://alphafold.ebi.ac.uk/entry/Q8IVV2","model_url":"https://alphafold.ebi.ac.uk/files/AF-Q8IVV2-F1-model_v6.cif","pae_url":"https://alphafold.ebi.ac.uk/files/AF-Q8IVV2-F1-predicted_aligned_error_v6.png","plddt_mean":83.69},"mouse_models":{"mgi_url":"https://www.informatics.jax.org/marker/summary?nomen=LOXHD1","jax_strain_url":"https://www.jax.org/strain/search?query=LOXHD1"},"sequence":{"accession":"Q8IVV2","fasta_url":"https://rest.uniprot.org/uniprotkb/Q8IVV2.fasta","uniprot_url":"https://www.uniprot.org/uniprotkb/Q8IVV2/entry","alphafold_viewer_url":"https://alphafold.ebi.ac.uk/entry/Q8IVV2"}},"corpus_meta":[{"pmid":"22341973","id":"PMC_22341973","title":"Mutations in LOXHD1, a recessive-deafness locus, cause dominant late-onset Fuchs corneal dystrophy.","date":"2012","source":"American journal of human genetics","url":"https://pubmed.ncbi.nlm.nih.gov/22341973","citation_count":140,"is_preprint":false},{"pmid":"19732867","id":"PMC_19732867","title":"Mutations in LOXHD1, an evolutionarily conserved stereociliary protein, disrupt hair cell function in mice and cause progressive hearing loss in humans.","date":"2009","source":"American journal of human genetics","url":"https://pubmed.ncbi.nlm.nih.gov/19732867","citation_count":120,"is_preprint":false},{"pmid":"21465660","id":"PMC_21465660","title":"A deleterious mutation in the LOXHD1 gene causes autosomal recessive hearing loss in Ashkenazi Jews.","date":"2011","source":"American journal of medical genetics. Part A","url":"https://pubmed.ncbi.nlm.nih.gov/21465660","citation_count":34,"is_preprint":false},{"pmid":"33707295","id":"PMC_33707295","title":"Loxhd1 Mutations Cause Mechanotransduction Defects in Cochlear Hair Cells.","date":"2021","source":"The Journal of neuroscience : the official journal of the Society for Neuroscience","url":"https://pubmed.ncbi.nlm.nih.gov/33707295","citation_count":33,"is_preprint":false},{"pmid":"25792669","id":"PMC_25792669","title":"Mutations in LOXHD1 gene cause various types and severities of hearing loss.","date":"2015","source":"The Annals of otology, rhinology, and laryngology","url":"https://pubmed.ncbi.nlm.nih.gov/25792669","citation_count":29,"is_preprint":false},{"pmid":"35705030","id":"PMC_35705030","title":"Oncofusion-driven de novo enhancer assembly promotes malignancy in Ewing sarcoma via aberrant expression of the stereociliary protein LOXHD1.","date":"2022","source":"Cell reports","url":"https://pubmed.ncbi.nlm.nih.gov/35705030","citation_count":19,"is_preprint":false},{"pmid":"31547530","id":"PMC_31547530","title":"Mutational Spectrum and Clinical Features of Patients with LOXHD1 Variants Identified in an 8074 Hearing Loss Patient Cohort.","date":"2019","source":"Genes","url":"https://pubmed.ncbi.nlm.nih.gov/31547530","citation_count":18,"is_preprint":false},{"pmid":"27121161","id":"PMC_27121161","title":"Analysis of SLC4A11, ZEB1, LOXHD1, COL8A2 and TCF4 gene sequences in a multi-generational family with late-onset Fuchs corneal dystrophy.","date":"2016","source":"International journal of molecular medicine","url":"https://pubmed.ncbi.nlm.nih.gov/27121161","citation_count":16,"is_preprint":false},{"pmid":"37441688","id":"PMC_37441688","title":"Systematic review of SLC4A11, ZEB1, LOXHD1, and AGBL1 variants in the development of Fuchs' endothelial corneal dystrophy.","date":"2023","source":"Frontiers in medicine","url":"https://pubmed.ncbi.nlm.nih.gov/37441688","citation_count":14,"is_preprint":false},{"pmid":"29799290","id":"PMC_29799290","title":"Analysis of candidate genes ZEB1 and LOXHD1 in late-onset Fuchs' endothelial corneal dystrophy in an Indian cohort.","date":"2018","source":"Ophthalmic genetics","url":"https://pubmed.ncbi.nlm.nih.gov/29799290","citation_count":14,"is_preprint":false},{"pmid":"32149082","id":"PMC_32149082","title":"Five Novel Mutations in LOXHD1 Gene Were Identified to Cause Autosomal Recessive Nonsyndromic Hearing Loss in Four Chinese Families.","date":"2020","source":"BioMed research international","url":"https://pubmed.ncbi.nlm.nih.gov/32149082","citation_count":13,"is_preprint":false},{"pmid":"39256406","id":"PMC_39256406","title":"LOXHD1 is indispensable for maintaining TMC1 auditory mechanosensitive channels at the site of force transmission.","date":"2024","source":"Nature communications","url":"https://pubmed.ncbi.nlm.nih.gov/39256406","citation_count":12,"is_preprint":false},{"pmid":"26973026","id":"PMC_26973026","title":"Clinical characteristics of a Japanese family with hearing loss accompanied by compound heterozygous mutations in LOXHD1.","date":"2016","source":"Auris, nasus, larynx","url":"https://pubmed.ncbi.nlm.nih.gov/26973026","citation_count":12,"is_preprint":false},{"pmid":"33753533","id":"PMC_33753533","title":"Rising of LOXHD1 as a signature causative gene of down-sloping hearing loss in people in their teens and 20s.","date":"2021","source":"Journal of medical genetics","url":"https://pubmed.ncbi.nlm.nih.gov/33753533","citation_count":9,"is_preprint":false},{"pmid":"31709873","id":"PMC_31709873","title":"A novel LOXHD1 variant in a Chinese couple with hearing loss.","date":"2019","source":"The Journal of international medical research","url":"https://pubmed.ncbi.nlm.nih.gov/31709873","citation_count":7,"is_preprint":false},{"pmid":"33983508","id":"PMC_33983508","title":"Missense variant in LOXHD1 is associated with canine nonsyndromic hearing loss.","date":"2021","source":"Human genetics","url":"https://pubmed.ncbi.nlm.nih.gov/33983508","citation_count":6,"is_preprint":false},{"pmid":"33892339","id":"PMC_33892339","title":"Recessive LOXHD1 variants cause a prelingual down-sloping hearing loss: genotype-phenotype correlation and three additional children with novel variants.","date":"2021","source":"International journal of pediatric otorhinolaryngology","url":"https://pubmed.ncbi.nlm.nih.gov/33892339","citation_count":3,"is_preprint":false},{"pmid":"35711932","id":"PMC_35711932","title":"Genetic Analysis of the LOXHD1 Gene in Chinese Patients With Non-Syndromic Hearing Loss.","date":"2022","source":"Frontiers in genetics","url":"https://pubmed.ncbi.nlm.nih.gov/35711932","citation_count":3,"is_preprint":false},{"pmid":"35875410","id":"PMC_35875410","title":"Mutations in LOXHD1 gene can cause auditory neuropathy spectrum disorder.","date":"2021","source":"Otolaryngology case reports","url":"https://pubmed.ncbi.nlm.nih.gov/35875410","citation_count":3,"is_preprint":false},{"pmid":"40771159","id":"PMC_40771159","title":"Monocyte LOXHD1 and RHOB Expression Predictive of Progressive Systemic Sclerosis-Associated Interstitial Lung Disease.","date":"2026","source":"Arthritis care & research","url":"https://pubmed.ncbi.nlm.nih.gov/40771159","citation_count":2,"is_preprint":false},{"pmid":"40070250","id":"PMC_40070250","title":"Clinical Exome Sequencing Identifies, Two Homozygous LOXHD1 Variants in Two Inbred Families With Pre-Lingual Hearing Loss From South India.","date":"2025","source":"Annals of human genetics","url":"https://pubmed.ncbi.nlm.nih.gov/40070250","citation_count":2,"is_preprint":false},{"pmid":"33062705","id":"PMC_33062705","title":"Corrigendum to \"Five Novel Mutations in LOXHD1 Gene Were Identified to Cause Autosomal Recessive Nonsyndromic Hearing Loss in Four Chinese Families\".","date":"2020","source":"BioMed research international","url":"https://pubmed.ncbi.nlm.nih.gov/33062705","citation_count":2,"is_preprint":false},{"pmid":"40234527","id":"PMC_40234527","title":"LOXHD1 is an oncofusion-regulated antigen of ewing sarcoma.","date":"2025","source":"Scientific reports","url":"https://pubmed.ncbi.nlm.nih.gov/40234527","citation_count":1,"is_preprint":false},{"pmid":"38260480","id":"PMC_38260480","title":"LOXHD1 is indispensable for coupling auditory mechanosensitive channels to the site of force transmission.","date":"2024","source":"Research square","url":"https://pubmed.ncbi.nlm.nih.gov/38260480","citation_count":1,"is_preprint":false},{"pmid":"40244234","id":"PMC_40244234","title":"From Genes to Disease: Reassessing LOXHD1 and AGBL1's Contribution to Fuchs' Dystrophy.","date":"2025","source":"International journal of molecular sciences","url":"https://pubmed.ncbi.nlm.nih.gov/40244234","citation_count":0,"is_preprint":false},{"pmid":"42131115","id":"PMC_42131115","title":"Identification of Novel LOXHD1 Variants in Chinese Patients with Non-Syndromic Hearing Loss.","date":"2026","source":"Journal of otology","url":"https://pubmed.ncbi.nlm.nih.gov/42131115","citation_count":0,"is_preprint":false}],"cost":{"stage1":{"model":"claude-sonnet-4-6","input_tokens":15248,"output_tokens":2540,"usd":0.041922,"stage1_stop_reason":"end_turn"},"stage2":{"model":"claude-opus-4-8","input_tokens":9677,"output_tokens":2726,"usd":0.058267,"stage2_stop_reason":"end_turn"},"total_usd":0.100189,"stage1_batch_id":"msgbatch_01BbTCMyrRPyhtEq6b1MdwCN","stage2_batch_id":"msgbatch_011dEed5bbxYvTAaQWKJevxu","note":"batch pricing = 50% of standard"},"stage1_raw":"```json\n{\n  \"discoveries\": [\n    {\n      \"year\": 2009,\n      \"finding\": \"LOXHD1 consists entirely of PLAT (polycystin/lipoxygenase/alpha-toxin) domains and is expressed along the membrane of mature hair cell stereocilia. In samba mice carrying an ENU-induced Loxhd1 mutation, stereociliary development is unaffected but hair cell function is perturbed and hair cells eventually degenerate, establishing LOXHD1 as required for hair cell function rather than stereociliary morphogenesis.\",\n      \"method\": \"ENU mutagenesis mouse model, immunolocalization, hair cell physiology, genetic linkage in human families\",\n      \"journal\": \"American journal of human genetics\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — in vivo mouse model with defined cellular phenotype (hair cell dysfunction/degeneration), direct protein localization, and replicated in human genetics; multiple orthogonal methods in one study\",\n      \"pmids\": [\"19732867\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2021,\n      \"finding\": \"LOXHD1 is required for mechanotransduction in cochlear inner hair cells (IHCs), but only after the first postnatal week, coinciding with its postnatal expression/localization along the stereocilia. In two Loxhd1 mouse models bearing mutations in the 10th PLAT repeat, mechanotransduction currents in IHCs were severely reduced by postnatal day 11 without morphological defects to the hair bundle or reduction in tip-link number. Harmonin and LHFPL5 (upper and lower tip-link complex proteins) were maintained in their correct locations in the mutants, indicating that the mechanotransduction machinery is present but not activatable.\",\n      \"method\": \"Loxhd1 knock-in mouse models (two alleles), electrophysiology (mechanotransduction current recording), immunolocalization of tip-link complex proteins\",\n      \"journal\": \"The Journal of neuroscience\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — two independent mouse models, electrophysiology with defined phenotype, immunolocalization of multiple pathway components, multiple orthogonal methods in one study\",\n      \"pmids\": [\"33707295\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2024,\n      \"finding\": \"LOXHD1 is essential for maintaining TMC1 (pore-forming subunit of mature auditory mechanosensitive channels) at the tip-link insertion site in stereocilia. Using SUB-immunogold-SEM, TMC1 was shown to localize within 100 nm of the tip link in wild-type mice but mislocalizes away from the force transmission site in the absence of LOXHD1. LOXHD1 selectively interacts in vitro with TMC1 (but not its developmental paralogue TMC2), and also binds channel subunits CIB2 and LHFPL5, and tip-link protein PCDH15. TMC2-driven developmental channels do not require LOXHD1 for tip-link coupling.\",\n      \"method\": \"Mouse knockout models, SUB-immunogold scanning electron microscopy (novel method for submembranous epitopes), in vitro binding assays (selective interaction of LOXHD1 with TMC1 but not TMC2), immunolocalization\",\n      \"journal\": \"Nature communications\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1-2 / Strong — novel structural/ultrastructural method (SUB-immunogold-SEM) combined with in vitro binding assays and mouse KO, multiple orthogonal methods establishing mechanism in a single rigorous study\",\n      \"pmids\": [\"39256406\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2024,\n      \"finding\": \"Preprint corroborating the peer-reviewed finding (PMID 39256406): LOXHD1 is indispensable for coupling TMC1-containing auditory mechanosensitive channels to the tip-link force transmission site; LOXHD1 interacts selectively with TMC1 but not TMC2 in vitro, and also binds CIB2, LHFPL5, and PCDH15. TMC1 is present but mislocalized in hair bundles lacking LOXHD1.\",\n      \"method\": \"Mouse models, SUB-immunogold-SEM, in vitro interaction assays\",\n      \"journal\": \"Research square (preprint)\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 1-2 / Moderate — preprint version of the same study as PMID 39256406; data appear identical; confidence limited to Medium for the preprint form\",\n      \"pmids\": [\"38260480\"],\n      \"is_preprint\": true\n    },\n    {\n      \"year\": 2012,\n      \"finding\": \"Missense mutations in LOXHD1 cause dominant late-onset Fuchs corneal dystrophy (FCD). LOXHD1 protein is detected by antibody staining in human and mouse corneal epithelium and endothelium. Expression of familial and sporadic LOXHD1 mutant alleles in cultured cells produced prominent cytoplasmic protein aggregates, paralleling the punctate endothelial staining seen in corneas of patients with causal LOXHD1 mutations but absent in normal or mutation-negative FCD corneas. In silico analysis predicted mutations to reside on the protein surface and affect protein-protein interactions.\",\n      \"method\": \"Next-generation sequencing of FCD pedigree, antibody staining of human and mouse corneas, mutant allele expression in cell culture (aggregation assay), in silico structural modeling\",\n      \"journal\": \"American journal of human genetics\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 3 / Moderate — cell culture expression assay shows aggregate formation, antibody localization in tissue; causal role in FCD remains contested by later systematic reviews; single lab with two orthogonal methods\",\n      \"pmids\": [\"22341973\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2016,\n      \"finding\": \"Molecular modeling of the PLAT domain of LOXHD1 predicted that the missense mutation p.V1892F distorts the domain structure and would decrease the protein's affinity for the lipid membrane, consistent with a mechanism by which PLAT domain integrity is required for LOXHD1 membrane association and hair cell function.\",\n      \"method\": \"In silico 3D molecular modeling (SWISS-MODEL) of PLAT domain\",\n      \"journal\": \"Auris, nasus, larynx\",\n      \"confidence\": \"Low\",\n      \"confidence_rationale\": \"Tier 4 / Weak — computational prediction only, no experimental validation of membrane binding\",\n      \"pmids\": [\"26973026\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2022,\n      \"finding\": \"In Ewing sarcoma, the oncofusion EWSR1::FLI1 transcription factor drives aberrant expression of a short LOXHD1 isoform via de novo enhancers upstream of an alternative transcription start site. Deletion or silencing of this EWSR1::FLI1-bound enhancer results in loss of the LOXHD1 short isoform, altered EWSR1::FLI1 and HIF1α pathway gene expression, and decreased proliferation and invasion of EwS cells.\",\n      \"method\": \"Integrative transcriptomic analysis, enhancer deletion/silencing, functional assays (proliferation, invasion) in EwS cell lines\",\n      \"journal\": \"Cell reports\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — enhancer deletion with defined cellular phenotype, pathway gene expression changes; single lab but multiple functional readouts\",\n      \"pmids\": [\"35705030\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2025,\n      \"finding\": \"LOXHD1 protein expression is highly restricted to inner hair cells of the cochlea, adult testis, and Ewing sarcoma tumor cells. LOXHD1-specific TCR-engineered CD8+ T cells (targeting HLA-A*02:01-restricted LOXHD1 epitopes) conferred cytotoxic activity against HLA-A*02:01+ EwS tumor cell lines in vitro, and adoptive transfer led to tumor eradication in a mouse xenograft model of EwS, confirming surface/immunogenic protein expression in EwS.\",\n      \"method\": \"Proteomics/immunogenicity assays, TCR isolation, TCR-T cell engineering, in vitro cytotoxicity assay, mouse xenograft adoptive transfer\",\n      \"journal\": \"Scientific reports\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — in vitro and in vivo functional validation of LOXHD1 as an immunogenic surface-accessible antigen in EwS; single lab, multiple orthogonal methods\",\n      \"pmids\": [\"40234527\"],\n      \"is_preprint\": false\n    }\n  ],\n  \"current_model\": \"LOXHD1 is a multi-PLAT-domain protein that localizes along the membrane of mature cochlear hair cell stereocilia where it is required for auditory mechanotransduction: specifically, LOXHD1 maintains the pore-forming channel subunit TMC1—but not its developmental paralogue TMC2—at the tip-link force-transmission site by selectively interacting with TMC1, CIB2, LHFPL5, and the tip-link protein PCDH15; loss of LOXHD1 mislocalizes TMC1, abolishes mature mechanotransduction currents, and leads to progressive hair cell degeneration and hereditary deafness (DFNB77), while in Ewing sarcoma the EWSR1::FLI1 oncofusion drives aberrant expression of a short LOXHD1 isoform via de novo enhancers that promotes tumor proliferation and invasion.\"\n}\n```","stage2_raw":"{\n  \"mechanistic_narrative\": \"LOXHD1 is a PLAT (polycystin/lipoxygenase/alpha-toxin) domain protein that localizes along the membrane of mature cochlear hair cell stereocilia and is required for auditory mechanotransduction rather than for stereociliary morphogenesis [#0]. Its function is developmentally gated: LOXHD1 is dispensable for hair bundle assembly and tip-link formation but becomes essential for inner hair cell mechanotransduction after the first postnatal week, coinciding with its postnatal stereociliary expression [#0, #1]. Mechanistically, LOXHD1 maintains the pore-forming subunit TMC1 at the tip-link force-transmission site: in its absence the mechanotransduction machinery (including harmonin, LHFPL5, and intact tip links) is present but TMC1 mislocalizes away from the tip-link insertion point and currents are abolished [#1, #2]. LOXHD1 interacts selectively in vitro with TMC1 but not its developmental paralogue TMC2, and binds the channel subunits CIB2 and LHFPL5 and the tip-link protein PCDH15, explaining why TMC2-driven developmental channels do not require LOXHD1 for tip-link coupling [#2]. Beyond the cochlea, the EWSR1::FLI1 oncofusion drives aberrant expression of a short LOXHD1 isoform via de novo enhancers, and this isoform supports Ewing sarcoma proliferation and invasion [#6]; LOXHD1 is also an immunogenic, surface-accessible antigen in Ewing sarcoma exploitable by TCR-engineered T cells [#7].\",\n  \"teleology\": [\n    {\n      \"year\": 2009,\n      \"claim\": \"Established that LOXHD1 is required for hair cell function and survival rather than for building the stereocilia, distinguishing a maintenance/activation role from a morphogenetic one.\",\n      \"evidence\": \"ENU-mutant samba mice with immunolocalization, hair cell physiology, and human family linkage\",\n      \"pmids\": [\"19732867\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\n        \"Molecular function of the PLAT domains not defined\",\n        \"No interacting partners identified\",\n        \"Mechanism of hair cell degeneration unresolved\"\n      ]\n    },\n    {\n      \"year\": 2021,\n      \"claim\": \"Showed LOXHD1's requirement is developmentally gated to mechanotransduction after the first postnatal week, with the channel machinery present but non-activatable, narrowing its role to channel function rather than complex assembly.\",\n      \"evidence\": \"Two Loxhd1 knock-in mouse alleles (10th PLAT repeat), mechanotransduction current recording, immunolocalization of harmonin and LHFPL5\",\n      \"pmids\": [\"33707295\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\n        \"Did not identify which channel subunit LOXHD1 acts on\",\n        \"Direct binding partners not established\",\n        \"Mechanism by which channels become activatable unknown\"\n      ]\n    },\n    {\n      \"year\": 2024,\n      \"claim\": \"Defined the molecular mechanism: LOXHD1 selectively retains TMC1 at the tip-link force-transmission site through direct interactions, explaining the paralogue-specific (TMC1 vs TMC2) and developmentally gated requirement.\",\n      \"evidence\": \"Mouse knockouts, SUB-immunogold-SEM for submembranous TMC1 localization, in vitro binding assays (TMC1, CIB2, LHFPL5, PCDH15)\",\n      \"pmids\": [\"39256406\", \"38260480\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\n        \"Structural basis of selective TMC1 vs TMC2 binding not resolved\",\n        \"Stoichiometry and architecture of the LOXHD1-channel complex unknown\",\n        \"Whether LOXHD1 also gates the channel mechanically vs only localizing it is unresolved\"\n      ]\n    },\n    {\n      \"year\": 2022,\n      \"claim\": \"Extended LOXHD1 biology beyond the cochlea by showing a short isoform is an EWSR1::FLI1 transcriptional output that promotes tumor proliferation and invasion in Ewing sarcoma.\",\n      \"evidence\": \"Integrative transcriptomics, enhancer deletion/silencing, proliferation and invasion assays in EwS cell lines\",\n      \"pmids\": [\"35705030\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\n        \"Molecular function of the short LOXHD1 isoform in tumor cells unknown\",\n        \"Whether the short isoform shares the stereociliary mechanism is unaddressed\",\n        \"Single-lab functional characterization\"\n      ]\n    },\n    {\n      \"year\": 2012,\n      \"claim\": \"Linked LOXHD1 missense mutations to dominant late-onset Fuchs corneal dystrophy via a mutant-aggregation phenotype, implicating protein-protein interaction surfaces.\",\n      \"evidence\": \"NGS of FCD pedigree, corneal antibody staining, mutant allele expression aggregation assay, in silico modeling\",\n      \"pmids\": [\"22341973\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\n        \"Causal role in FCD contested by later systematic reviews\",\n        \"Aggregation mechanism not tied to a defined corneal function\",\n        \"Single-lab evidence\"\n      ]\n    },\n    {\n      \"year\": 2025,\n      \"claim\": \"Demonstrated LOXHD1 is an immunogenic, surface-accessible antigen restricted to hair cells, testis, and Ewing sarcoma, enabling targeted T-cell killing of tumor cells.\",\n      \"evidence\": \"Proteomics/immunogenicity assays, TCR-engineered CD8+ T cells, in vitro cytotoxicity, mouse xenograft adoptive transfer\",\n      \"pmids\": [\"40234527\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\n        \"Topology/orientation explaining surface accessibility not directly resolved\",\n        \"On-target off-tumor risk in testis/cochlea not addressed\",\n        \"Single-lab study\"\n      ]\n    },\n    {\n      \"year\": null,\n      \"claim\": \"How LOXHD1's PLAT domains achieve selective TMC1 recognition and whether LOXHD1 contributes to channel gating beyond localization remains unresolved.\",\n      \"evidence\": \"No structural or reconstitution study in the corpus resolves the LOXHD1-channel interface or gating contribution\",\n      \"pmids\": [],\n      \"confidence\": \"High\",\n      \"gaps\": [\n        \"No high-resolution structure of LOXHD1 or its channel complex\",\n        \"Functional role of the short tumor isoform mechanistically uncharacterized\",\n        \"Membrane-binding mechanism of PLAT domains experimentally unvalidated\"\n      ]\n    }\n  ],\n  \"mechanism_profile\": {\n    \"molecular_activity\": [\n      {\"term_id\": \"GO:0140096\", \"supporting_discovery_ids\": [2]},\n      {\"term_id\": \"GO:0060090\", \"supporting_discovery_ids\": [2]},\n      {\"term_id\": \"GO:0008289\", \"supporting_discovery_ids\": [0]}\n    ],\n    \"localization\": [\n      {\"term_id\": \"GO:0005886\", \"supporting_discovery_ids\": [0, 1]},\n      {\"term_id\": \"GO:0005856\", \"supporting_discovery_ids\": [0]}\n    ],\n    \"pathway\": [\n      {\"term_id\": \"R-HSA-112316\", \"supporting_discovery_ids\": [0, 1, 2]},\n      {\"term_id\": \"R-HSA-9709957\", \"supporting_discovery_ids\": [0, 2]}\n    ],\n    \"complexes\": [],\n    \"partners\": [\"TMC1\", \"CIB2\", \"LHFPL5\", \"PCDH15\"],\n    \"other_free_text\": []\n  }\n}","audit_flag":null,"evaluation":{"pairwise":"win","faith_supported":5,"faith_total":5,"faith_pct":100.0}}