{"gene":"USH1G","run_date":"2026-06-10T10:51:56","timeline":{"discoveries":[{"year":2003,"finding":"SANS (USH1G) protein associates with harmonin (USH1C) via its C-terminal PDZ-binding motif, demonstrated by co-transfection experiments; frameshift and missense mutations in SANS cause Usher syndrome type I.","method":"Co-transfection / co-expression assay; positional cloning with mutation analysis","journal":"Human molecular genetics","confidence":"Medium","confidence_rationale":"Tier 3 / Moderate — single co-transfection assay showing interaction, replicated by two independent labs in the same year (PMID 12588794, 12588793)","pmids":["12588794","12588793"],"is_preprint":false},{"year":2003,"finding":"SANS protein contains three ankyrin repeats, a SAM (sterile alpha motif) domain, and a C-terminal PDZ-binding motif; loss-of-function mutations causing truncation of the SAM domain result in disorganized cochlear hair bundle stereocilia in Jackson shaker mice.","method":"Positional cloning, BAC transgenic rescue, sequence analysis, immunofluorescence of cochlear hair cells","journal":"Human molecular genetics","confidence":"High","confidence_rationale":"Tier 2 / Strong — positional cloning with transgenic rescue, replicated across two independent labs (PMID 12588793, 12588794)","pmids":["12588793","12588794"],"is_preprint":false},{"year":2007,"finding":"SANS localizes to the ciliary apparatus, ribbon synapses, outer limiting membrane cell-cell adhesions, and periciliary regions of mammalian photoreceptor cells, consistent with a scaffold role in USH protein networks at these subcellular compartments.","method":"Subcellular fractionation, tangential cryosections, immunocytochemistry with specific antibodies in developing and mature mouse retinas","journal":"Vision research","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — direct localization by fractionation and immunocytochemistry, single lab, multiple methods","pmids":["17923142"],"is_preprint":false},{"year":2009,"finding":"Drosophila Sans ortholog localizes to early endosomes (marked by syntaxin Avalanche) in follicle cells, consistent with an evolutionarily conserved role in vesicle/endosomal trafficking, rather than directly in microvilli morphogenesis.","method":"Immunofluorescence co-localization with endosomal markers in Drosophila follicle cells; genetic loss-of-function analysis","journal":"PloS one","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — direct localization with organelle markers plus loss-of-function, single lab","pmids":["19270738"],"is_preprint":false},{"year":2011,"finding":"SANS interacts directly with the cytoplasmic domains of cadherin-23 (USH1D) and protocadherin-15 (USH1F) in vitro; SANS localizes to the tips of short- and middle-row stereocilia (lower tip-link density) and is absent in mice lacking either cadherin, placing it at the lower end of the tip-link complex. Loss of SANS causes reduced transducer current amplitude, loss of tip-link integrity, and dramatic reduction in stereocilia length, linking mechanotransduction machinery to F-actin polymerization.","method":"In vitro binding assays, conditional knockout mice (Ush1g fl/fl; Myo15-cre), electrophysiology of transduction currents, immunofluorescence, electron microscopy","journal":"Proceedings of the National Academy of Sciences of the United States of America","confidence":"High","confidence_rationale":"Tier 1-2 / Strong — in vitro binding assays combined with conditional knockout with defined electrophysiological and morphological phenotypes, single lab with multiple orthogonal methods","pmids":["21436032"],"is_preprint":false},{"year":2011,"finding":"MYO7A (myosin VIIa), SANS, and harmonin-b form a tripartite complex at the upper tip-link density (UTLD); each protein can interact with the others independently; MYO7A and SANS co-localize at the UTLD by immunofluorescence and GFP-tagged constructs in hair cells, with ~8 or more MYO7A molecules per UTLD.","method":"Immunofluorescence in mouse cochlear hair cells, GFP-tagged constructs, co-transfection in heterologous system demonstrating tripartite complex","journal":"Proceedings of the National Academy of Sciences of the United States of America","confidence":"High","confidence_rationale":"Tier 2 / Strong — reciprocal co-transfection establishing tripartite complex plus direct localization in hair cells using multiple methods, independently consistent with PMID 21436032","pmids":["21709241"],"is_preprint":false},{"year":2011,"finding":"SANS directly interacts with myomegalin (PDE4DIP/MCIP) via its central domain (CENT); SANS and myomegalin co-localize at microtubules in photoreceptor inner segments, suggesting a role for the SANS-myomegalin complex in microtubule-dependent cargo transport toward the ciliary base.","method":"Yeast two-hybrid screen of retinal cDNA library, independent binding assays, co-immunolocalization by immunofluorescence and electron microscopy","journal":"Biochimica et biophysica acta","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — yeast two-hybrid confirmed by independent assays, single lab, co-localization by multiple microscopy methods","pmids":["21767579"],"is_preprint":false},{"year":2010,"finding":"SANS localization in cochlear hair cell stereocilia depends on harmonin (USH1C): in Ush1c-/- mice, SANS is mislocalized toward the base of stereocilia rather than its normal position, indicating that harmonin is required for correct SANS positioning within the USH1 protein network.","method":"Immunofluorescence on cochlear whole mounts and sections from Ush1c-/- knockout mice","journal":"International journal of experimental pathology","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — direct localization experiment in defined genetic knockout, single lab","pmids":["21156003"],"is_preprint":false},{"year":2014,"finding":"SANS interacts with Magi2 (membrane-associated guanylate kinase inverted-2); this interaction is regulated by CK2-mediated phosphorylation of an internal PDZ-binding motif within the SAM domain of SANS. Phosphorylated SANS promotes Magi2-mediated, clathrin-dependent endocytosis, which in turn regulates ciliogenesis. The SANS-Magi2 complex localizes to the periciliary membrane complex at the ciliary pocket of photoreceptor cells; USH1G pathogenic mutations eliminate Magi2 binding.","method":"Co-IP, RNAi knockdown, kinase assay (CK2 phosphorylation), immunofluorescence, immunohistochemistry in situ","journal":"Human molecular genetics","confidence":"High","confidence_rationale":"Tier 2 / Strong — multiple orthogonal methods (Co-IP, kinase assay, RNAi knockdown with ciliogenesis readout, in situ localization), single lab","pmids":["24608321"],"is_preprint":false},{"year":2017,"finding":"SANS (USH1G) directly interacts with ush2a (USH2A) and together with whirlin (USH2D) forms a ternary USH1/USH2 complex via mutual interactions; this complex is present in the periciliary region, inner segment, and synapses of rodent and human photoreceptor cells. Pathogenic USH1G mutations severely disrupt SANS/ush2a/whirlin complex formation; translational read-through drug treatment targeting a SANS nonsense mutation restored SANS scaffold function.","method":"Protein-protein interaction assays, co-expression assays, proximity ligation assay (PLA), immunohistochemistry in rodent and human retina, read-through drug treatment","journal":"Human molecular genetics","confidence":"High","confidence_rationale":"Tier 2 / Strong — reciprocal protein interaction assays plus PLA in situ plus functional rescue, single lab with multiple orthogonal methods","pmids":["28137943"],"is_preprint":false},{"year":2018,"finding":"Glutaredoxin GRXCR1 regulates hair bundle morphogenesis by destabilizing the physical interaction between Sans (USH1G/Ush1ga) and Harmonin (USH1C/Ush1c); glutathionylation promotes the Sans-Harmonin interaction, and Grxcr1 deglutathionylation prevents this specific interaction without affecting other USH1 complexes such as Ush1c-Cadherin23-Myosin7aa.","method":"Zebrafish grxcr1 mutant alleles, in vitro glutathionylation/deglutathionylation binding assays, pull-down assays","journal":"Cell reports","confidence":"High","confidence_rationale":"Tier 1-2 / Strong — in vitro biochemical assays plus zebrafish genetic loss-of-function with defined hair bundle phenotype, identifying specific molecular mechanism","pmids":["30380418"],"is_preprint":false},{"year":2019,"finding":"SANS directly binds IFT complex B proteins IFT52 and IFT57 via its N-terminal ankyrin repeats and central domain; SANS co-localizes with IFT20, IFT52, and IFT57 at the ciliary base of photoreceptor cells; in SANS knockout mice, IFT protein levels at the ciliary compartment are reduced. Pathogenic mutations in the SANS N-terminus disrupt IFT-B binding, linking USH1G to intraflagellar transport.","method":"1:1 yeast two-hybrid, in vitro complementary interaction assays, membrane targeting assay in cells, quantitative immunofluorescence in wild-type and SANS knockout mouse photoreceptors","journal":"Frontiers in cell and developmental biology","confidence":"High","confidence_rationale":"Tier 2 / Strong — yeast two-hybrid validated by multiple independent assays plus in vivo knockout phenotype, single lab multiple orthogonal methods","pmids":["31637240"],"is_preprint":false},{"year":2019,"finding":"MYO7A, USH1C, and USH1G (SANS) form a tripartite complex that undergoes liquid-liquid phase separation in cells and in vitro, potentially explaining the formation of high-density stereocilia tip-link density structures. Point mutations in MYO7A found in Usher syndrome patients weaken multivalent interactions within the MYO7A/USH1C/USH1G complex and impair phase separation.","method":"In vitro phase separation assay, cell transfection condensate assay, mutant protein binding assays","journal":"Cell reports","confidence":"High","confidence_rationale":"Tier 1 / Strong — in vitro reconstitution of phase separation plus cell-based condensate formation plus mutagenesis, single lab with multiple orthogonal methods","pmids":["31644917"],"is_preprint":false},{"year":2021,"finding":"SANS is present in the nucleus, specifically in Cajal bodies and nuclear speckles, where it interacts with spliceosomal components SF3B1, SON, PRPFs, and snRNAs of the tri-snRNP complex. SANS is required for transfer of tri-snRNPs from Cajal bodies to nuclear speckles for spliceosome assembly. SANS depletion causes accumulation of spliceosomal complex A and altered splicing of genes related to cell proliferation and Usher syndrome pathology.","method":"Co-immunoprecipitation with spliceosomal components, immunofluorescence in Cajal bodies/nuclear speckles, RNAi knockdown with spliceosome assembly assay, RNA-seq splicing analysis","journal":"Nucleic acids research","confidence":"High","confidence_rationale":"Tier 2 / Strong — reciprocal Co-IP with multiple spliceosomal partners, RNAi with defined assembly phenotype, localization by immunofluorescence, multiple orthogonal methods in single lab","pmids":["34023904"],"is_preprint":false},{"year":2023,"finding":"SANS directly binds spliceosomal proteins PRPF31 and PRPF6 via two distinct conserved regions of its CENTn domain; binding is sequential, and PRPF6 binding triggers a conformational change in an intrinsically disordered region of SANS CENTn2 to a short alpha-helix. Pathogenic USH1G variants in the CENTn domain perturb binding to both PRPFs.","method":"FRET assays in cells, in silico deep learning-based protein structure prediction (AlphaFold), mutant protein interaction assays","journal":"International journal of molecular sciences","confidence":"Medium","confidence_rationale":"Tier 2-3 / Moderate — FRET-based interaction assays in cells complemented by structural modeling; structure prediction is computational but supported by cell-based FRET","pmids":["38139438"],"is_preprint":false},{"year":2016,"finding":"Genetic epistasis between Ush1g and Cdh23: heterozygous Ush1g/Sans mutation alone causes early-onset progressive hearing loss in C57BL/6J mice only when combined with a strain-specific Cdh23 allele; CRISPR-mediated correction of the Cdh23 variant in double-heterozygous mice fully rescues the hearing loss and stereocilia degeneration, demonstrating that SANS and CDH23 functionally interact to maintain stereocilia integrity.","method":"Classical genetic analysis, CRISPR/Cas9 Cdh23 knock-in, auditory brainstem response, scanning electron microscopy of stereocilia","journal":"Human molecular genetics","confidence":"High","confidence_rationale":"Tier 2 / Strong — rigorous genetic epistasis with CRISPR rescue, multiple readouts including functional (ABR) and morphological, single lab","pmids":["26936824"],"is_preprint":false},{"year":2005,"finding":"A D458V missense mutation at the -3 position of the SANS PDZ-binding motif causes atypical Usher syndrome; molecular modeling indicates this mutation impairs the interaction of SANS with harmonin, consistent with the PDZ-binding motif being required for harmonin binding.","method":"Homozygosity mapping, mutation analysis, molecular modeling of PDZ-motif interaction","journal":"Journal of molecular medicine","confidence":"Low","confidence_rationale":"Tier 4 / Weak — molecular modeling only for mechanistic claim; genetic finding is solid but mechanism is computationally inferred","pmids":["16283141"],"is_preprint":false},{"year":2023,"finding":"A spontaneous null allele of Ush1g (stop codon at amino acid 4) in mice produces disorganized and split hair bundles, absent auditory brainstem responses, absent vestibular-evoked potentials, altered distribution of stereocilia tip proteins, and kinocilium displacement, establishing USH1G as essential for kinocilial link formation and hair bundle organization.","method":"Spontaneous mutagenesis model, auditory brainstem response, vestibular-evoked potentials, scanning electron microscopy, immunofluorescence of stereocilia proteins","journal":"Genes, brain, and behavior","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — null mouse model with multiple functional and morphological readouts, single lab","pmids":["37328946"],"is_preprint":false}],"current_model":"USH1G/SANS is a multifunctional scaffold protein that: (1) anchors the stereocilia tip-link complex by directly binding cadherin-23 and protocadherin-15 at the lower tip-link density, physically coupling mechanotransduction to F-actin polymerization; (2) forms a tripartite complex with MYO7A and harmonin (USH1C) that undergoes liquid-liquid phase separation to build the upper tip-link density; (3) bridges USH1 and USH2 protein networks in photoreceptor periciliary regions via direct interaction with ush2a and whirlin; (4) regulates endocytosis and ciliogenesis through CK2-phosphorylation-dependent binding to Magi2; (5) links the USH protein network to intraflagellar transport via direct binding to IFT-B proteins IFT52 and IFT57 through its N-terminal ankyrin repeats; and (6) functions in the nucleus within Cajal bodies and nuclear speckles, where it mediates transfer of tri-snRNP complexes for spliceosome assembly and interacts with PRPF31 and PRPF6 through its CENTn domain, with pathogenic USH1G mutations disrupting all of these interactions."},"narrative":{"mechanistic_narrative":"USH1G encodes SANS, a multidomain scaffold protein—built from N-terminal ankyrin repeats, a central (CENT) domain, a SAM domain, and a C-terminal PDZ-binding motif—that organizes the Usher syndrome (USH) protein networks at the apex of sensory hair cells and in photoreceptors, and whose loss-of-function mutations cause Usher syndrome type I [PMID:12588794, PMID:12588793]. In the cochlea SANS localizes to the stereocilia tip-link region, where it directly binds the cytoplasmic domains of cadherin-23 and protocadherin-15 at the lower tip-link density and is required for tip-link integrity, transduction current, and stereocilia growth, thereby coupling mechanotransduction to F-actin polymerization [PMID:21436032]; a genetic epistasis between Ush1g and Cdh23 rescued by CRISPR correction confirms this functional partnership in maintaining bundle integrity [PMID:26936824]. SANS also assembles with MYO7A and harmonin (USH1C) into a tripartite complex at the upper tip-link density that undergoes liquid-liquid phase separation to build these high-density assemblies, with Usher-associated mutations weakening the multivalent interactions [PMID:21709241, PMID:31644917]; its correct positioning depends on harmonin [PMID:21156003], and the SANS–harmonin interaction is tuned by GRXCR1-controlled glutathionylation [PMID:30380418]. In photoreceptors SANS bridges the USH1 and USH2 networks through direct binding to ush2a and whirlin in periciliary regions [PMID:28137943], links the network to intraflagellar transport via N-terminal ankyrin-repeat binding to IFT-B proteins IFT52 and IFT57 [PMID:31637240], and regulates clathrin-dependent endocytosis and ciliogenesis through CK2-phosphorylation-dependent binding to Magi2 [PMID:24608321]. Beyond its cytoplasmic scaffolding roles, SANS functions in the nucleus within Cajal bodies and nuclear speckles, where it interacts with spliceosomal components including PRPF31 and PRPF6 via its CENT domain and mediates transfer of tri-snRNP complexes for spliceosome assembly [PMID:34023904, PMID:38139438]. Pathogenic USH1G mutations recurrently disrupt these scaffold interactions across compartments [PMID:24608321, PMID:28137943, PMID:38139438].","teleology":[{"year":2003,"claim":"Establishing that SANS is a domain-organized scaffold whose mutations cause Usher syndrome type I framed the protein as a network organizer rather than an enzyme, and identified harmonin as its first binding partner.","evidence":"Positional cloning with BAC transgenic rescue, sequence/domain analysis, and co-transfection interaction assays in Jackson shaker mice","pmids":["12588793","12588794"],"confidence":"High","gaps":["Did not resolve which subcellular compartments SANS organizes","Functional consequence of harmonin binding for hair bundle assembly not established"]},{"year":2005,"claim":"An atypical-Usher PDZ-motif missense mutation tested whether the C-terminal motif is specifically required for harmonin binding.","evidence":"Homozygosity mapping, mutation analysis, and molecular modeling of the PDZ-motif interaction","pmids":["16283141"],"confidence":"Low","gaps":["Mechanistic impairment is computationally inferred, not biochemically demonstrated","No direct binding assay with the mutant protein"]},{"year":2007,"claim":"Mapping SANS to ciliary, synaptic, adhesion, and periciliary compartments of photoreceptors broadened its role beyond the cochlea to retinal USH networks.","evidence":"Subcellular fractionation and immunocytochemistry in developing and mature mouse retina","pmids":["17923142"],"confidence":"Medium","gaps":["Localization alone did not define molecular partners in each compartment","Functional requirement at each site untested"]},{"year":2009,"claim":"The Drosophila Sans ortholog localizing to early endosomes raised an evolutionarily conserved trafficking function distinct from direct microvillar morphogenesis.","evidence":"Immunofluorescence co-localization with endosomal markers and loss-of-function analysis in Drosophila follicle cells","pmids":["19270738"],"confidence":"Medium","gaps":["Relevance of endosomal role to mammalian hair cell/photoreceptor function unclear","Trafficking cargo not identified"]},{"year":2010,"claim":"Demonstrating that harmonin is required for correct SANS positioning ordered the USH1 network hierarchically within stereocilia.","evidence":"Immunofluorescence on cochlear whole mounts and sections from Ush1c-/- mice","pmids":["21156003"],"confidence":"Medium","gaps":["Did not establish whether mispositioning alone drives hair bundle dysfunction","Single lab, single readout"]},{"year":2011,"claim":"Direct binding of SANS to cadherin-23 and protocadherin-15 plus conditional knockout phenotypes placed SANS at the lower tip-link density and linked mechanotransduction to actin-based stereocilia growth.","evidence":"In vitro binding assays, conditional Ush1g knockout, transduction-current electrophysiology, immunofluorescence and electron microscopy","pmids":["21436032"],"confidence":"High","gaps":["How SANS mechanically couples the tip link to actin polymerization not resolved at molecular level","Stoichiometry at the lower density not quantified"]},{"year":2011,"claim":"Identification of a MYO7A/SANS/harmonin tripartite complex at the upper tip-link density, and a SANS–myomegalin complex at photoreceptor microtubules, defined SANS as a hub for multiple compartment-specific assemblies.","evidence":"Reciprocal co-transfection, GFP-tagged constructs and immunofluorescence in hair cells; yeast two-hybrid plus co-localization for myomegalin","pmids":["21709241","21767579"],"confidence":"High","gaps":["Functional contribution of the SANS-myomegalin complex to cargo transport not directly tested","How the tripartite complex is spatially restricted to the UTLD unknown"]},{"year":2014,"claim":"Discovery of CK2-phosphorylation-dependent SANS–Magi2 binding connected SANS to clathrin-dependent endocytosis and ciliogenesis at the photoreceptor ciliary pocket.","evidence":"Co-IP, CK2 kinase assay, RNAi knockdown with ciliogenesis readout, in situ localization","pmids":["24608321"],"confidence":"High","gaps":["Endocytic cargo regulated by the SANS-Magi2 complex not identified","Link between this endocytic role and hearing not established"]},{"year":2016,"claim":"Genetic epistasis with CRISPR rescue proved that SANS and CDH23 functionally interact in vivo to maintain stereocilia integrity, moving the binding observation to a causal genetic relationship.","evidence":"Classical genetics, CRISPR Cdh23 knock-in, auditory brainstem response, scanning electron microscopy","pmids":["26936824"],"confidence":"High","gaps":["Molecular basis of the dosage sensitivity not detailed","Whether comparable epistasis operates in photoreceptors untested"]},{"year":2017,"claim":"SANS bridging USH1 and USH2 networks via direct ush2a and whirlin binding, with read-through rescue of a nonsense allele, unified the two Usher protein networks and demonstrated therapeutic restoration of scaffold function.","evidence":"Reciprocal interaction/co-expression assays, proximity ligation assay in rodent and human retina, read-through drug treatment","pmids":["28137943"],"confidence":"High","gaps":["Physiological output of the USH1/USH2 ternary complex not measured","Whether read-through restores function in vivo unknown"]},{"year":2018,"claim":"GRXCR1-controlled glutathionylation toggling the SANS–harmonin interaction revealed a redox-based regulatory layer specific to that complex.","evidence":"Zebrafish grxcr1 mutants, in vitro glutathionylation/deglutathionylation binding and pull-down assays","pmids":["30380418"],"confidence":"High","gaps":["Which cysteine residues are modified not pinpointed","Physiological trigger for redox switching during bundle morphogenesis unknown"]},{"year":2019,"claim":"Direct SANS binding to IFT-B proteins IFT52/IFT57 via ankyrin repeats, and LLPS of the MYO7A/USH1C/SANS complex, connected SANS to intraflagellar transport and explained how high-density tip-link structures self-assemble.","evidence":"Yeast two-hybrid and complementary binding assays plus knockout IFT quantification; in vitro and cellular phase-separation assays with disease mutations","pmids":["31637240","31644917"],"confidence":"High","gaps":["Whether IFT cargo delivery depends on SANS in vivo beyond reduced IFT levels not shown","How phase separation is regulated spatially in stereocilia unclear"]},{"year":2021,"claim":"Finding nuclear SANS in Cajal bodies and speckles that mediates tri-snRNP transfer for spliceosome assembly revealed a wholly distinct nuclear function with splicing consequences for Usher-related genes.","evidence":"Co-IP with spliceosomal components, immunofluorescence, RNAi with spliceosome assembly assay, RNA-seq splicing analysis","pmids":["34023904"],"confidence":"High","gaps":["How SANS partitions between cytoplasmic scaffold and nuclear splicing roles unknown","Contribution of the splicing defect to Usher pathology not isolated from cytoplasmic roles"]},{"year":2023,"claim":"Defining sequential PRPF31 then PRPF6 binding by the CENTn domain, with a disorder-to-helix transition, and characterizing a null mouse provided molecular and physiological detail to the nuclear and hair-bundle roles respectively.","evidence":"Cellular FRET assays with AlphaFold modeling and mutant binding; spontaneous null Ush1g mouse with ABR, vestibular-evoked potentials, electron microscopy and immunofluorescence","pmids":["38139438","37328946"],"confidence":"Medium","gaps":["CENTn structural transition is computationally modeled and not experimentally resolved at atomic level","Kinocilial link role mechanism beyond morphology not defined"]},{"year":null,"claim":"How SANS is partitioned and coordinated across its mechanotransductive, ciliary-trafficking, endocytic, and nuclear-splicing roles, and which functions dominate Usher syndrome pathology, remains unresolved.","evidence":"","pmids":[],"confidence":"Medium","gaps":["No unified model integrating cytoplasmic scaffold and nuclear splicing functions","Relative pathogenic contribution of each compartment-specific interaction not ranked","No high-resolution structure of full-length SANS"]}],"mechanism_profile":{"molecular_activity":[{"term_id":"GO:0060090","term_label":"molecular adaptor activity","supporting_discovery_ids":[0,4,5,9,11]},{"term_id":"GO:0008092","term_label":"cytoskeletal protein binding","supporting_discovery_ids":[4]},{"term_id":"GO:0003723","term_label":"RNA binding","supporting_discovery_ids":[13]}],"localization":[{"term_id":"GO:0005856","term_label":"cytoskeleton","supporting_discovery_ids":[4,5,6]},{"term_id":"GO:0005929","term_label":"cilium","supporting_discovery_ids":[2,8,11]},{"term_id":"GO:0005730","term_label":"nucleolus","supporting_discovery_ids":[13]},{"term_id":"GO:0005654","term_label":"nucleoplasm","supporting_discovery_ids":[13]},{"term_id":"GO:0005768","term_label":"endosome","supporting_discovery_ids":[3]},{"term_id":"GO:0005886","term_label":"plasma membrane","supporting_discovery_ids":[8]}],"pathway":[{"term_id":"R-HSA-9709957","term_label":"Sensory Perception","supporting_discovery_ids":[4,9,17]},{"term_id":"R-HSA-8953854","term_label":"Metabolism of RNA","supporting_discovery_ids":[13]},{"term_id":"R-HSA-5653656","term_label":"Vesicle-mediated transport","supporting_discovery_ids":[8]},{"term_id":"R-HSA-1852241","term_label":"Organelle biogenesis and maintenance","supporting_discovery_ids":[8,11]}],"complexes":["MYO7A/USH1C/USH1G tip-link density complex","SANS/USH2A/whirlin USH1-USH2 complex","tri-snRNP/spliceosomal complex"],"partners":["USH1C","CDH23","PCDH15","MYO7A","MAGI2","USH2A","IFT52","PRPF31"],"other_free_text":[]}},"prefetch_data":{"uniprot":{"accession":"Q495M9","full_name":"pre-mRNA splicing regulator USH1G","aliases":["Scaffold protein containing ankyrin repeats and SAM domain","Usher syndrome type-1G protein"],"length_aa":461,"mass_kda":51.5,"function":"Plays a role in pre-mRNA splicing by regulating the release and transfer of U4/U6.U5 tri-small nuclear ribonucleoprotein (tri-snRNP) complexes from their assembly site in Cajal bodies to nuclear speckles, thereby contributing to the assembly of the pre-catalytic spliceosome on target pre-mRNAs (PubMed:34023904). May also participate in recycling of snRNPs back to Cajal bodies during splicing (PubMed:34023904). Plays a role in regulating MAGI2-mediated endocytosis (PubMed:24608321). Anchoring/scaffolding protein that is a part of the functional network formed by USH1C, USH1G, CDH23 and MYO7A that mediates mechanotransduction in cochlear hair cells. Required for normal development and maintenance of cochlear hair cell bundles. Required for normal hearing","subcellular_location":"Cytoplasm, cytosol; Cytoplasm, cytoskeleton; Cell membrane; Cell projection, cilium; Nucleus speckle; Nucleus, Cajal body; Cytoplasm, cytoskeleton, microtubule organizing center, centrosome; Photoreceptor inner segment","url":"https://www.uniprot.org/uniprotkb/Q495M9/entry"},"depmap":{"release":"DepMap","has_data":true,"is_common_essential":false,"resolved_as":"","url":"https://depmap.org/portal/gene/USH1G","classification":"Not Classified","n_dependent_lines":20,"n_total_lines":1208,"dependency_fraction":0.016556291390728478},"opencell":{"profiled":false,"resolved_as":"","ensg_id":"","cell_line_id":"","localizations":[],"interactors":[],"url":"https://opencell.sf.czbiohub.org/search/USH1G","total_profiled":1310},"omim":[{"mim_id":"619268","title":"ALZAHRANI-KUWAHARA SYNDROME; ALKUS","url":"https://www.omim.org/entry/619268"},{"mim_id":"612971","title":"PDZ DOMAIN-CONTAINING 7; PDZD7","url":"https://www.omim.org/entry/612971"},{"mim_id":"609901","title":"ANKYRIN REPEAT AND STERILE ALPHA MOTIF DOMAINS-CONTAINING PROTEIN 4B; ANKS4B","url":"https://www.omim.org/entry/609901"},{"mim_id":"607928","title":"WHIRLIN; WHRN","url":"https://www.omim.org/entry/607928"},{"mim_id":"607696","title":"USH1 PROTEIN NETWORK COMPONENT SANS; USH1G","url":"https://www.omim.org/entry/607696"}],"hpa":{"profiled":true,"resolved_as":"","reliability":"Approved","locations":[{"location":"Vesicles","reliability":"Approved"},{"location":"Nucleoplasm","reliability":"Additional"},{"location":"Cytosol","reliability":"Additional"}],"tissue_specificity":"Tissue enhanced","tissue_distribution":"Detected in some","driving_tissues":[{"tissue":"esophagus","ntpm":7.5},{"tissue":"skin 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enzymology","url":"https://pubmed.ncbi.nlm.nih.gov/36410963","citation_count":6,"is_preprint":false},{"pmid":"22709575","id":"PMC_22709575","title":"Use of SANS and biophysical techniques to reveal subtle conformational differences between native apo-calmodulin and its unfolded states.","date":"2012","source":"Biochimica et biophysica acta","url":"https://pubmed.ncbi.nlm.nih.gov/22709575","citation_count":6,"is_preprint":false},{"pmid":"38139438","id":"PMC_38139438","title":"Pathogenic Variants in USH1G/SANS Alter Protein Interaction with Pre-RNA Processing Factors PRPF6 and PRPF31 of the Spliceosome.","date":"2023","source":"International journal of molecular sciences","url":"https://pubmed.ncbi.nlm.nih.gov/38139438","citation_count":5,"is_preprint":false},{"pmid":"36410952","id":"PMC_36410952","title":"Time-resolved small-angle neutron scattering (TR-SANS) for structural biology of dynamic systems: Principles, recent developments, and practical guidelines.","date":"2022","source":"Methods in enzymology","url":"https://pubmed.ncbi.nlm.nih.gov/36410952","citation_count":5,"is_preprint":false},{"pmid":"40064322","id":"PMC_40064322","title":"Integration of network pharmacology and untargeted metabolomics reveals Changpu San's antidepressant mechanisms via tryptophan metabolism.","date":"2025","source":"Journal of ethnopharmacology","url":"https://pubmed.ncbi.nlm.nih.gov/40064322","citation_count":5,"is_preprint":false},{"pmid":"17314449","id":"PMC_17314449","title":"EEC syndrome sans clefting: variable clinical presentations in a family.","date":"2007","source":"Indian journal of dermatology, venereology and leprology","url":"https://pubmed.ncbi.nlm.nih.gov/17314449","citation_count":5,"is_preprint":false},{"pmid":"21211716","id":"PMC_21211716","title":"San1-mediated quality control: substrate recognition \"sans\" chaperones.","date":"2011","source":"Molecular 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America","url":"https://pubmed.ncbi.nlm.nih.gov/37903276","citation_count":4,"is_preprint":false},{"pmid":"33393176","id":"PMC_33393176","title":"Conformation of Myoglobin-Poly(Ethyl Ethylene Phosphate) Conjugates Probed by SANS: Correlation with Polymer Grafting Density and Interaction.","date":"2021","source":"Macromolecular bioscience","url":"https://pubmed.ncbi.nlm.nih.gov/33393176","citation_count":4,"is_preprint":false},{"pmid":"40022179","id":"PMC_40022179","title":"SANS investigation of fungal loosenins reveals substrate-dependent impacts of protein action on the inter-microfibril arrangement of cellulosic substrates.","date":"2025","source":"Biotechnology for biofuels and bioproducts","url":"https://pubmed.ncbi.nlm.nih.gov/40022179","citation_count":4,"is_preprint":false},{"pmid":"37328946","id":"PMC_37328946","title":"Spontaneous allelic variant in deafness-blindness gene Ush1g resulting in an expanded phenotype.","date":"2023","source":"Genes, brain, and behavior","url":"https://pubmed.ncbi.nlm.nih.gov/37328946","citation_count":3,"is_preprint":false},{"pmid":"30305329","id":"PMC_30305329","title":"B Cell Development sans B Cell Receptor Responsiveness Due to Unfolded Protein Response-Triggered Mef2c Protein Degradation.","date":"2018","source":"Journal of immunology (Baltimore, Md. : 1950)","url":"https://pubmed.ncbi.nlm.nih.gov/30305329","citation_count":3,"is_preprint":false},{"pmid":"40912487","id":"PMC_40912487","title":"Network pharmacology-guided lipidomics and molecular docking reveals the involvement of sphingolipid metabolism and HIF-1 signaling in Xiaoyao San's blood-nourishing mechanism against depression.","date":"2025","source":"Journal of ethnopharmacology","url":"https://pubmed.ncbi.nlm.nih.gov/40912487","citation_count":3,"is_preprint":false}],"cost":{"stage1":{"model":"claude-sonnet-4-6","input_tokens":43054,"output_tokens":4757,"usd":0.100259,"stage1_stop_reason":"end_turn"},"stage2":{"model":"claude-opus-4-8","input_tokens":12840,"output_tokens":4931,"usd":0.093738,"stage2_stop_reason":"end_turn"},"total_usd":0.193997,"stage1_batch_id":"msgbatch_017qqVz33Ga63SCDwzb35XPb","stage2_batch_id":"msgbatch_01Scr2Ei9x4HJMiRGxwrmvLK","note":"batch pricing = 50% of standard"},"stage1_raw":"```json\n{\n  \"discoveries\": [\n    {\n      \"year\": 2003,\n      \"finding\": \"SANS (USH1G) protein associates with harmonin (USH1C) via its C-terminal PDZ-binding motif, demonstrated by co-transfection experiments; frameshift and missense mutations in SANS cause Usher syndrome type I.\",\n      \"method\": \"Co-transfection / co-expression assay; positional cloning with mutation analysis\",\n      \"journal\": \"Human molecular genetics\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 3 / Moderate — single co-transfection assay showing interaction, replicated by two independent labs in the same year (PMID 12588794, 12588793)\",\n      \"pmids\": [\"12588794\", \"12588793\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2003,\n      \"finding\": \"SANS protein contains three ankyrin repeats, a SAM (sterile alpha motif) domain, and a C-terminal PDZ-binding motif; loss-of-function mutations causing truncation of the SAM domain result in disorganized cochlear hair bundle stereocilia in Jackson shaker mice.\",\n      \"method\": \"Positional cloning, BAC transgenic rescue, sequence analysis, immunofluorescence of cochlear hair cells\",\n      \"journal\": \"Human molecular genetics\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — positional cloning with transgenic rescue, replicated across two independent labs (PMID 12588793, 12588794)\",\n      \"pmids\": [\"12588793\", \"12588794\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2007,\n      \"finding\": \"SANS localizes to the ciliary apparatus, ribbon synapses, outer limiting membrane cell-cell adhesions, and periciliary regions of mammalian photoreceptor cells, consistent with a scaffold role in USH protein networks at these subcellular compartments.\",\n      \"method\": \"Subcellular fractionation, tangential cryosections, immunocytochemistry with specific antibodies in developing and mature mouse retinas\",\n      \"journal\": \"Vision research\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — direct localization by fractionation and immunocytochemistry, single lab, multiple methods\",\n      \"pmids\": [\"17923142\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2009,\n      \"finding\": \"Drosophila Sans ortholog localizes to early endosomes (marked by syntaxin Avalanche) in follicle cells, consistent with an evolutionarily conserved role in vesicle/endosomal trafficking, rather than directly in microvilli morphogenesis.\",\n      \"method\": \"Immunofluorescence co-localization with endosomal markers in Drosophila follicle cells; genetic loss-of-function analysis\",\n      \"journal\": \"PloS one\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — direct localization with organelle markers plus loss-of-function, single lab\",\n      \"pmids\": [\"19270738\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2011,\n      \"finding\": \"SANS interacts directly with the cytoplasmic domains of cadherin-23 (USH1D) and protocadherin-15 (USH1F) in vitro; SANS localizes to the tips of short- and middle-row stereocilia (lower tip-link density) and is absent in mice lacking either cadherin, placing it at the lower end of the tip-link complex. Loss of SANS causes reduced transducer current amplitude, loss of tip-link integrity, and dramatic reduction in stereocilia length, linking mechanotransduction machinery to F-actin polymerization.\",\n      \"method\": \"In vitro binding assays, conditional knockout mice (Ush1g fl/fl; Myo15-cre), electrophysiology of transduction currents, immunofluorescence, electron microscopy\",\n      \"journal\": \"Proceedings of the National Academy of Sciences of the United States of America\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1-2 / Strong — in vitro binding assays combined with conditional knockout with defined electrophysiological and morphological phenotypes, single lab with multiple orthogonal methods\",\n      \"pmids\": [\"21436032\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2011,\n      \"finding\": \"MYO7A (myosin VIIa), SANS, and harmonin-b form a tripartite complex at the upper tip-link density (UTLD); each protein can interact with the others independently; MYO7A and SANS co-localize at the UTLD by immunofluorescence and GFP-tagged constructs in hair cells, with ~8 or more MYO7A molecules per UTLD.\",\n      \"method\": \"Immunofluorescence in mouse cochlear hair cells, GFP-tagged constructs, co-transfection in heterologous system demonstrating tripartite complex\",\n      \"journal\": \"Proceedings of the National Academy of Sciences of the United States of America\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — reciprocal co-transfection establishing tripartite complex plus direct localization in hair cells using multiple methods, independently consistent with PMID 21436032\",\n      \"pmids\": [\"21709241\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2011,\n      \"finding\": \"SANS directly interacts with myomegalin (PDE4DIP/MCIP) via its central domain (CENT); SANS and myomegalin co-localize at microtubules in photoreceptor inner segments, suggesting a role for the SANS-myomegalin complex in microtubule-dependent cargo transport toward the ciliary base.\",\n      \"method\": \"Yeast two-hybrid screen of retinal cDNA library, independent binding assays, co-immunolocalization by immunofluorescence and electron microscopy\",\n      \"journal\": \"Biochimica et biophysica acta\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — yeast two-hybrid confirmed by independent assays, single lab, co-localization by multiple microscopy methods\",\n      \"pmids\": [\"21767579\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2010,\n      \"finding\": \"SANS localization in cochlear hair cell stereocilia depends on harmonin (USH1C): in Ush1c-/- mice, SANS is mislocalized toward the base of stereocilia rather than its normal position, indicating that harmonin is required for correct SANS positioning within the USH1 protein network.\",\n      \"method\": \"Immunofluorescence on cochlear whole mounts and sections from Ush1c-/- knockout mice\",\n      \"journal\": \"International journal of experimental pathology\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — direct localization experiment in defined genetic knockout, single lab\",\n      \"pmids\": [\"21156003\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2014,\n      \"finding\": \"SANS interacts with Magi2 (membrane-associated guanylate kinase inverted-2); this interaction is regulated by CK2-mediated phosphorylation of an internal PDZ-binding motif within the SAM domain of SANS. Phosphorylated SANS promotes Magi2-mediated, clathrin-dependent endocytosis, which in turn regulates ciliogenesis. The SANS-Magi2 complex localizes to the periciliary membrane complex at the ciliary pocket of photoreceptor cells; USH1G pathogenic mutations eliminate Magi2 binding.\",\n      \"method\": \"Co-IP, RNAi knockdown, kinase assay (CK2 phosphorylation), immunofluorescence, immunohistochemistry in situ\",\n      \"journal\": \"Human molecular genetics\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — multiple orthogonal methods (Co-IP, kinase assay, RNAi knockdown with ciliogenesis readout, in situ localization), single lab\",\n      \"pmids\": [\"24608321\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2017,\n      \"finding\": \"SANS (USH1G) directly interacts with ush2a (USH2A) and together with whirlin (USH2D) forms a ternary USH1/USH2 complex via mutual interactions; this complex is present in the periciliary region, inner segment, and synapses of rodent and human photoreceptor cells. Pathogenic USH1G mutations severely disrupt SANS/ush2a/whirlin complex formation; translational read-through drug treatment targeting a SANS nonsense mutation restored SANS scaffold function.\",\n      \"method\": \"Protein-protein interaction assays, co-expression assays, proximity ligation assay (PLA), immunohistochemistry in rodent and human retina, read-through drug treatment\",\n      \"journal\": \"Human molecular genetics\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — reciprocal protein interaction assays plus PLA in situ plus functional rescue, single lab with multiple orthogonal methods\",\n      \"pmids\": [\"28137943\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2018,\n      \"finding\": \"Glutaredoxin GRXCR1 regulates hair bundle morphogenesis by destabilizing the physical interaction between Sans (USH1G/Ush1ga) and Harmonin (USH1C/Ush1c); glutathionylation promotes the Sans-Harmonin interaction, and Grxcr1 deglutathionylation prevents this specific interaction without affecting other USH1 complexes such as Ush1c-Cadherin23-Myosin7aa.\",\n      \"method\": \"Zebrafish grxcr1 mutant alleles, in vitro glutathionylation/deglutathionylation binding assays, pull-down assays\",\n      \"journal\": \"Cell reports\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1-2 / Strong — in vitro biochemical assays plus zebrafish genetic loss-of-function with defined hair bundle phenotype, identifying specific molecular mechanism\",\n      \"pmids\": [\"30380418\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2019,\n      \"finding\": \"SANS directly binds IFT complex B proteins IFT52 and IFT57 via its N-terminal ankyrin repeats and central domain; SANS co-localizes with IFT20, IFT52, and IFT57 at the ciliary base of photoreceptor cells; in SANS knockout mice, IFT protein levels at the ciliary compartment are reduced. Pathogenic mutations in the SANS N-terminus disrupt IFT-B binding, linking USH1G to intraflagellar transport.\",\n      \"method\": \"1:1 yeast two-hybrid, in vitro complementary interaction assays, membrane targeting assay in cells, quantitative immunofluorescence in wild-type and SANS knockout mouse photoreceptors\",\n      \"journal\": \"Frontiers in cell and developmental biology\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — yeast two-hybrid validated by multiple independent assays plus in vivo knockout phenotype, single lab multiple orthogonal methods\",\n      \"pmids\": [\"31637240\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2019,\n      \"finding\": \"MYO7A, USH1C, and USH1G (SANS) form a tripartite complex that undergoes liquid-liquid phase separation in cells and in vitro, potentially explaining the formation of high-density stereocilia tip-link density structures. Point mutations in MYO7A found in Usher syndrome patients weaken multivalent interactions within the MYO7A/USH1C/USH1G complex and impair phase separation.\",\n      \"method\": \"In vitro phase separation assay, cell transfection condensate assay, mutant protein binding assays\",\n      \"journal\": \"Cell reports\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 / Strong — in vitro reconstitution of phase separation plus cell-based condensate formation plus mutagenesis, single lab with multiple orthogonal methods\",\n      \"pmids\": [\"31644917\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2021,\n      \"finding\": \"SANS is present in the nucleus, specifically in Cajal bodies and nuclear speckles, where it interacts with spliceosomal components SF3B1, SON, PRPFs, and snRNAs of the tri-snRNP complex. SANS is required for transfer of tri-snRNPs from Cajal bodies to nuclear speckles for spliceosome assembly. SANS depletion causes accumulation of spliceosomal complex A and altered splicing of genes related to cell proliferation and Usher syndrome pathology.\",\n      \"method\": \"Co-immunoprecipitation with spliceosomal components, immunofluorescence in Cajal bodies/nuclear speckles, RNAi knockdown with spliceosome assembly assay, RNA-seq splicing analysis\",\n      \"journal\": \"Nucleic acids research\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — reciprocal Co-IP with multiple spliceosomal partners, RNAi with defined assembly phenotype, localization by immunofluorescence, multiple orthogonal methods in single lab\",\n      \"pmids\": [\"34023904\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2023,\n      \"finding\": \"SANS directly binds spliceosomal proteins PRPF31 and PRPF6 via two distinct conserved regions of its CENTn domain; binding is sequential, and PRPF6 binding triggers a conformational change in an intrinsically disordered region of SANS CENTn2 to a short alpha-helix. Pathogenic USH1G variants in the CENTn domain perturb binding to both PRPFs.\",\n      \"method\": \"FRET assays in cells, in silico deep learning-based protein structure prediction (AlphaFold), mutant protein interaction assays\",\n      \"journal\": \"International journal of molecular sciences\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2-3 / Moderate — FRET-based interaction assays in cells complemented by structural modeling; structure prediction is computational but supported by cell-based FRET\",\n      \"pmids\": [\"38139438\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2016,\n      \"finding\": \"Genetic epistasis between Ush1g and Cdh23: heterozygous Ush1g/Sans mutation alone causes early-onset progressive hearing loss in C57BL/6J mice only when combined with a strain-specific Cdh23 allele; CRISPR-mediated correction of the Cdh23 variant in double-heterozygous mice fully rescues the hearing loss and stereocilia degeneration, demonstrating that SANS and CDH23 functionally interact to maintain stereocilia integrity.\",\n      \"method\": \"Classical genetic analysis, CRISPR/Cas9 Cdh23 knock-in, auditory brainstem response, scanning electron microscopy of stereocilia\",\n      \"journal\": \"Human molecular genetics\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — rigorous genetic epistasis with CRISPR rescue, multiple readouts including functional (ABR) and morphological, single lab\",\n      \"pmids\": [\"26936824\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2005,\n      \"finding\": \"A D458V missense mutation at the -3 position of the SANS PDZ-binding motif causes atypical Usher syndrome; molecular modeling indicates this mutation impairs the interaction of SANS with harmonin, consistent with the PDZ-binding motif being required for harmonin binding.\",\n      \"method\": \"Homozygosity mapping, mutation analysis, molecular modeling of PDZ-motif interaction\",\n      \"journal\": \"Journal of molecular medicine\",\n      \"confidence\": \"Low\",\n      \"confidence_rationale\": \"Tier 4 / Weak — molecular modeling only for mechanistic claim; genetic finding is solid but mechanism is computationally inferred\",\n      \"pmids\": [\"16283141\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2023,\n      \"finding\": \"A spontaneous null allele of Ush1g (stop codon at amino acid 4) in mice produces disorganized and split hair bundles, absent auditory brainstem responses, absent vestibular-evoked potentials, altered distribution of stereocilia tip proteins, and kinocilium displacement, establishing USH1G as essential for kinocilial link formation and hair bundle organization.\",\n      \"method\": \"Spontaneous mutagenesis model, auditory brainstem response, vestibular-evoked potentials, scanning electron microscopy, immunofluorescence of stereocilia proteins\",\n      \"journal\": \"Genes, brain, and behavior\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — null mouse model with multiple functional and morphological readouts, single lab\",\n      \"pmids\": [\"37328946\"],\n      \"is_preprint\": false\n    }\n  ],\n  \"current_model\": \"USH1G/SANS is a multifunctional scaffold protein that: (1) anchors the stereocilia tip-link complex by directly binding cadherin-23 and protocadherin-15 at the lower tip-link density, physically coupling mechanotransduction to F-actin polymerization; (2) forms a tripartite complex with MYO7A and harmonin (USH1C) that undergoes liquid-liquid phase separation to build the upper tip-link density; (3) bridges USH1 and USH2 protein networks in photoreceptor periciliary regions via direct interaction with ush2a and whirlin; (4) regulates endocytosis and ciliogenesis through CK2-phosphorylation-dependent binding to Magi2; (5) links the USH protein network to intraflagellar transport via direct binding to IFT-B proteins IFT52 and IFT57 through its N-terminal ankyrin repeats; and (6) functions in the nucleus within Cajal bodies and nuclear speckles, where it mediates transfer of tri-snRNP complexes for spliceosome assembly and interacts with PRPF31 and PRPF6 through its CENTn domain, with pathogenic USH1G mutations disrupting all of these interactions.\"\n}\n```","stage2_raw":"{\n  \"mechanistic_narrative\": \"USH1G encodes SANS, a multidomain scaffold protein—built from N-terminal ankyrin repeats, a central (CENT) domain, a SAM domain, and a C-terminal PDZ-binding motif—that organizes the Usher syndrome (USH) protein networks at the apex of sensory hair cells and in photoreceptors, and whose loss-of-function mutations cause Usher syndrome type I [#0, #1]. In the cochlea SANS localizes to the stereocilia tip-link region, where it directly binds the cytoplasmic domains of cadherin-23 and protocadherin-15 at the lower tip-link density and is required for tip-link integrity, transduction current, and stereocilia growth, thereby coupling mechanotransduction to F-actin polymerization [#4]; a genetic epistasis between Ush1g and Cdh23 rescued by CRISPR correction confirms this functional partnership in maintaining bundle integrity [#15]. SANS also assembles with MYO7A and harmonin (USH1C) into a tripartite complex at the upper tip-link density that undergoes liquid-liquid phase separation to build these high-density assemblies, with Usher-associated mutations weakening the multivalent interactions [#5, #12]; its correct positioning depends on harmonin [#7], and the SANS–harmonin interaction is tuned by GRXCR1-controlled glutathionylation [#10]. In photoreceptors SANS bridges the USH1 and USH2 networks through direct binding to ush2a and whirlin in periciliary regions [#9], links the network to intraflagellar transport via N-terminal ankyrin-repeat binding to IFT-B proteins IFT52 and IFT57 [#11], and regulates clathrin-dependent endocytosis and ciliogenesis through CK2-phosphorylation-dependent binding to Magi2 [#8]. Beyond its cytoplasmic scaffolding roles, SANS functions in the nucleus within Cajal bodies and nuclear speckles, where it interacts with spliceosomal components including PRPF31 and PRPF6 via its CENT domain and mediates transfer of tri-snRNP complexes for spliceosome assembly [#13, #14]. Pathogenic USH1G mutations recurrently disrupt these scaffold interactions across compartments [#8, #9, #14].\",\n  \"teleology\": [\n    {\n      \"year\": 2003,\n      \"claim\": \"Establishing that SANS is a domain-organized scaffold whose mutations cause Usher syndrome type I framed the protein as a network organizer rather than an enzyme, and identified harmonin as its first binding partner.\",\n      \"evidence\": \"Positional cloning with BAC transgenic rescue, sequence/domain analysis, and co-transfection interaction assays in Jackson shaker mice\",\n      \"pmids\": [\"12588793\", \"12588794\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Did not resolve which subcellular compartments SANS organizes\", \"Functional consequence of harmonin binding for hair bundle assembly not established\"]\n    },\n    {\n      \"year\": 2005,\n      \"claim\": \"An atypical-Usher PDZ-motif missense mutation tested whether the C-terminal motif is specifically required for harmonin binding.\",\n      \"evidence\": \"Homozygosity mapping, mutation analysis, and molecular modeling of the PDZ-motif interaction\",\n      \"pmids\": [\"16283141\"],\n      \"confidence\": \"Low\",\n      \"gaps\": [\"Mechanistic impairment is computationally inferred, not biochemically demonstrated\", \"No direct binding assay with the mutant protein\"]\n    },\n    {\n      \"year\": 2007,\n      \"claim\": \"Mapping SANS to ciliary, synaptic, adhesion, and periciliary compartments of photoreceptors broadened its role beyond the cochlea to retinal USH networks.\",\n      \"evidence\": \"Subcellular fractionation and immunocytochemistry in developing and mature mouse retina\",\n      \"pmids\": [\"17923142\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Localization alone did not define molecular partners in each compartment\", \"Functional requirement at each site untested\"]\n    },\n    {\n      \"year\": 2009,\n      \"claim\": \"The Drosophila Sans ortholog localizing to early endosomes raised an evolutionarily conserved trafficking function distinct from direct microvillar morphogenesis.\",\n      \"evidence\": \"Immunofluorescence co-localization with endosomal markers and loss-of-function analysis in Drosophila follicle cells\",\n      \"pmids\": [\"19270738\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Relevance of endosomal role to mammalian hair cell/photoreceptor function unclear\", \"Trafficking cargo not identified\"]\n    },\n    {\n      \"year\": 2010,\n      \"claim\": \"Demonstrating that harmonin is required for correct SANS positioning ordered the USH1 network hierarchically within stereocilia.\",\n      \"evidence\": \"Immunofluorescence on cochlear whole mounts and sections from Ush1c-/- mice\",\n      \"pmids\": [\"21156003\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Did not establish whether mispositioning alone drives hair bundle dysfunction\", \"Single lab, single readout\"]\n    },\n    {\n      \"year\": 2011,\n      \"claim\": \"Direct binding of SANS to cadherin-23 and protocadherin-15 plus conditional knockout phenotypes placed SANS at the lower tip-link density and linked mechanotransduction to actin-based stereocilia growth.\",\n      \"evidence\": \"In vitro binding assays, conditional Ush1g knockout, transduction-current electrophysiology, immunofluorescence and electron microscopy\",\n      \"pmids\": [\"21436032\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"How SANS mechanically couples the tip link to actin polymerization not resolved at molecular level\", \"Stoichiometry at the lower density not quantified\"]\n    },\n    {\n      \"year\": 2011,\n      \"claim\": \"Identification of a MYO7A/SANS/harmonin tripartite complex at the upper tip-link density, and a SANS–myomegalin complex at photoreceptor microtubules, defined SANS as a hub for multiple compartment-specific assemblies.\",\n      \"evidence\": \"Reciprocal co-transfection, GFP-tagged constructs and immunofluorescence in hair cells; yeast two-hybrid plus co-localization for myomegalin\",\n      \"pmids\": [\"21709241\", \"21767579\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Functional contribution of the SANS-myomegalin complex to cargo transport not directly tested\", \"How the tripartite complex is spatially restricted to the UTLD unknown\"]\n    },\n    {\n      \"year\": 2014,\n      \"claim\": \"Discovery of CK2-phosphorylation-dependent SANS–Magi2 binding connected SANS to clathrin-dependent endocytosis and ciliogenesis at the photoreceptor ciliary pocket.\",\n      \"evidence\": \"Co-IP, CK2 kinase assay, RNAi knockdown with ciliogenesis readout, in situ localization\",\n      \"pmids\": [\"24608321\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Endocytic cargo regulated by the SANS-Magi2 complex not identified\", \"Link between this endocytic role and hearing not established\"]\n    },\n    {\n      \"year\": 2016,\n      \"claim\": \"Genetic epistasis with CRISPR rescue proved that SANS and CDH23 functionally interact in vivo to maintain stereocilia integrity, moving the binding observation to a causal genetic relationship.\",\n      \"evidence\": \"Classical genetics, CRISPR Cdh23 knock-in, auditory brainstem response, scanning electron microscopy\",\n      \"pmids\": [\"26936824\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Molecular basis of the dosage sensitivity not detailed\", \"Whether comparable epistasis operates in photoreceptors untested\"]\n    },\n    {\n      \"year\": 2017,\n      \"claim\": \"SANS bridging USH1 and USH2 networks via direct ush2a and whirlin binding, with read-through rescue of a nonsense allele, unified the two Usher protein networks and demonstrated therapeutic restoration of scaffold function.\",\n      \"evidence\": \"Reciprocal interaction/co-expression assays, proximity ligation assay in rodent and human retina, read-through drug treatment\",\n      \"pmids\": [\"28137943\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Physiological output of the USH1/USH2 ternary complex not measured\", \"Whether read-through restores function in vivo unknown\"]\n    },\n    {\n      \"year\": 2018,\n      \"claim\": \"GRXCR1-controlled glutathionylation toggling the SANS–harmonin interaction revealed a redox-based regulatory layer specific to that complex.\",\n      \"evidence\": \"Zebrafish grxcr1 mutants, in vitro glutathionylation/deglutathionylation binding and pull-down assays\",\n      \"pmids\": [\"30380418\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Which cysteine residues are modified not pinpointed\", \"Physiological trigger for redox switching during bundle morphogenesis unknown\"]\n    },\n    {\n      \"year\": 2019,\n      \"claim\": \"Direct SANS binding to IFT-B proteins IFT52/IFT57 via ankyrin repeats, and LLPS of the MYO7A/USH1C/SANS complex, connected SANS to intraflagellar transport and explained how high-density tip-link structures self-assemble.\",\n      \"evidence\": \"Yeast two-hybrid and complementary binding assays plus knockout IFT quantification; in vitro and cellular phase-separation assays with disease mutations\",\n      \"pmids\": [\"31637240\", \"31644917\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Whether IFT cargo delivery depends on SANS in vivo beyond reduced IFT levels not shown\", \"How phase separation is regulated spatially in stereocilia unclear\"]\n    },\n    {\n      \"year\": 2021,\n      \"claim\": \"Finding nuclear SANS in Cajal bodies and speckles that mediates tri-snRNP transfer for spliceosome assembly revealed a wholly distinct nuclear function with splicing consequences for Usher-related genes.\",\n      \"evidence\": \"Co-IP with spliceosomal components, immunofluorescence, RNAi with spliceosome assembly assay, RNA-seq splicing analysis\",\n      \"pmids\": [\"34023904\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"How SANS partitions between cytoplasmic scaffold and nuclear splicing roles unknown\", \"Contribution of the splicing defect to Usher pathology not isolated from cytoplasmic roles\"]\n    },\n    {\n      \"year\": 2023,\n      \"claim\": \"Defining sequential PRPF31 then PRPF6 binding by the CENTn domain, with a disorder-to-helix transition, and characterizing a null mouse provided molecular and physiological detail to the nuclear and hair-bundle roles respectively.\",\n      \"evidence\": \"Cellular FRET assays with AlphaFold modeling and mutant binding; spontaneous null Ush1g mouse with ABR, vestibular-evoked potentials, electron microscopy and immunofluorescence\",\n      \"pmids\": [\"38139438\", \"37328946\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"CENTn structural transition is computationally modeled and not experimentally resolved at atomic level\", \"Kinocilial link role mechanism beyond morphology not defined\"]\n    },\n    {\n      \"year\": null,\n      \"claim\": \"How SANS is partitioned and coordinated across its mechanotransductive, ciliary-trafficking, endocytic, and nuclear-splicing roles, and which functions dominate Usher syndrome pathology, remains unresolved.\",\n      \"evidence\": \"\",\n      \"pmids\": [],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"No unified model integrating cytoplasmic scaffold and nuclear splicing functions\", \"Relative pathogenic contribution of each compartment-specific interaction not ranked\", \"No high-resolution structure of full-length SANS\"]\n    }\n  ],\n  \"mechanism_profile\": {\n    \"molecular_activity\": [\n      {\"term_id\": \"GO:0060090\", \"supporting_discovery_ids\": [0, 4, 5, 9, 11]},\n      {\"term_id\": \"GO:0008092\", \"supporting_discovery_ids\": [4]},\n      {\"term_id\": \"GO:0003723\", \"supporting_discovery_ids\": [13]}\n    ],\n    \"localization\": [\n      {\"term_id\": \"GO:0005856\", \"supporting_discovery_ids\": [4, 5, 6]},\n      {\"term_id\": \"GO:0005929\", \"supporting_discovery_ids\": [2, 8, 11]},\n      {\"term_id\": \"GO:0005730\", \"supporting_discovery_ids\": [13]},\n      {\"term_id\": \"GO:0005654\", \"supporting_discovery_ids\": [13]},\n      {\"term_id\": \"GO:0005768\", \"supporting_discovery_ids\": [3]},\n      {\"term_id\": \"GO:0005886\", \"supporting_discovery_ids\": [8]}\n    ],\n    \"pathway\": [\n      {\"term_id\": \"R-HSA-9709957\", \"supporting_discovery_ids\": [4, 9, 17]},\n      {\"term_id\": \"R-HSA-8953854\", \"supporting_discovery_ids\": [13]},\n      {\"term_id\": \"R-HSA-5653656\", \"supporting_discovery_ids\": [8]},\n      {\"term_id\": \"R-HSA-1852241\", \"supporting_discovery_ids\": [8, 11]}\n    ],\n    \"complexes\": [\n      \"MYO7A/USH1C/USH1G tip-link density complex\",\n      \"SANS/USH2A/whirlin USH1-USH2 complex\",\n      \"tri-snRNP/spliceosomal complex\"\n    ],\n    \"partners\": [\n      \"USH1C\",\n      \"CDH23\",\n      \"PCDH15\",\n      \"MYO7A\",\n      \"MAGI2\",\n      \"USH2A\",\n      \"IFT52\",\n      \"PRPF31\"\n    ],\n    \"other_free_text\": []\n  }\n}","audit_flag":null,"evaluation":{"pairwise":"win","faith_supported":6,"faith_total":6,"faith_pct":100.0}}