{"gene":"RSPH1","run_date":"2026-06-10T07:46:28","timeline":{"discoveries":[{"year":2007,"finding":"RSPH1 (RSP44/human meichroacidin) protein localizes within the radial spokes of the axonemal complex of sperm flagella and in cilia of tracheal and ependymal epithelial cells, as demonstrated by EM immunocytochemistry and immunofluorescence; it is expressed in testis and ciliated tissues and may undergo proteolytic processing in sperm (38 kDa isoform vs. 44 kDa form in somatic tissues).","method":"EM immunocytochemistry, immunofluorescence, Western blot, Northern blot, RT-PCR","journal":"Gene","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — direct subcellular localization by EM immunocytochemistry with immunofluorescence corroboration, single lab, multiple orthogonal methods","pmids":["17451891"],"is_preprint":false},{"year":2013,"finding":"Loss-of-function mutations in RSPH1 cause primary ciliary dyskinesia with central-complex (CC) and radial-spoke (RS) defects; wild-type RSPH1 localizes within cilia of airway cells but is undetectable in cilia from individuals with RSPH1 loss-of-function mutations, establishing that RSPH1 is required for proper assembly of CCs and RSs in human airway cilia.","method":"Homozygosity mapping, whole-exome sequencing, immunofluorescence of airway cilia, high-speed video microscopy, transcript analysis from airway cells","journal":"American journal of human genetics","confidence":"High","confidence_rationale":"Tier 2 / Strong — immunofluorescence localization linked to functional defect, replicated across 10 independent families, multiple orthogonal methods","pmids":["23993197"],"is_preprint":false},{"year":2014,"finding":"RSPH1 mutations result in loss of the entire radial spoke head structure from cilia: high-resolution immunofluorescence of RSPH1-mutated cilia revealed co-loss of RSPH4A and RSPH9 along with RSPH1, and ultrastructural analysis showed transposition of peripheral outer microtubules into the empty central pair space with intermittent central pair loss, suggesting RSPH1 is required for tethering central microtubules via radial spoke heads.","method":"Targeted NGS panel, high-resolution immunofluorescence microscopy, transmission electron microscopy","journal":"Human molecular genetics","confidence":"High","confidence_rationale":"Tier 2 / Strong — direct immunofluorescence showing co-loss of multiple RS head proteins, corroborated by ultrastructural EM, two orthogonal methods","pmids":["24518672"],"is_preprint":false},{"year":2014,"finding":"Biallelic loss-of-function mutations in RSPH1 cause PCD with a unique phenotype: cilia show normal beat frequency but an abnormal circular beat pattern, higher nasal nitric oxide levels, and milder lung disease compared to other PCD genotypes, indicating residual ciliary function despite RSPH1 loss.","method":"Whole-exome sequencing, Sanger sequencing, high-speed video microscopy of ciliary beat, nasal nitric oxide measurement, lung function testing","journal":"American journal of respiratory and critical care medicine","confidence":"High","confidence_rationale":"Tier 2 / Strong — functional ciliary beat analysis in 16 individuals with biallelic mutations, replicated across multiple families with orthogonal genotypic and phenotypic methods","pmids":["24568568"],"is_preprint":false},{"year":2015,"finding":"RSPH4A is the core protein of the radial spoke head: absence of RSPH4A (due to RSPH4A mutations) results in deficient axonemal assembly of both RSPH1 and RSPH9. Conversely, RSPH1 mutations cause loss of RSPH9 from the axoneme but not RSPH4A, while RSPH9 mutations cause loss of RSPH9 alone without affecting RSPH1 or RSPH4A assembly, defining a hierarchical assembly order for the RS head complex.","method":"High-resolution immunofluorescence analysis of respiratory cilia in 21 individuals with biallelic mutations in RSPH9, RSPH4A, and RSPH1","journal":"American journal of respiratory cell and molecular biology","confidence":"High","confidence_rationale":"Tier 2 / Strong — systematic immunofluorescence across three gene-mutant groups in 16 families, orthogonal to genetic data, single lab but large cohort with internal controls","pmids":["25789548"],"is_preprint":false},{"year":2015,"finding":"RSPH3 mutations cause loss of RSPH3 from cilia while RSPH23 (RS-neck protein), RSPH1 and RSPH4A (RS-head proteins) remain present within cilia, placing RSPH3 at the RS stalk/neck upstream of the RS head proteins and demonstrating that RSPH1 and RSPH4A can assemble independently of RSPH3.","method":"Immunofluorescence of respiratory epithelial cells from RSPH3-mutant individuals","journal":"American journal of human genetics","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — direct immunofluorescence localization in patient-derived cells, single lab, negative result for RSPH1 loss in RSPH3-mutant context is mechanistically informative","pmids":["26073779"],"is_preprint":false},{"year":2021,"finding":"In RSPH4A-/- human respiratory cilia, cryo-electron tomography revealed loss of radial spoke heads of RS1 and RS2 (but not RS3) with additional defects in arch domains adjacent to RS1 and RS2 heads — a pattern similar to but distinct from RSPH1-/- cilia (which lacked RS1 and RS2 heads without arch domain defects), providing structural resolution of RSPH1's specific contribution to the RS head of RS1 and RS2.","method":"Cryo-electron tomography (cryo-ET) and subtomogram averaging of patient-derived human respiratory cilia","journal":"Molecular biology of the cell","confidence":"High","confidence_rationale":"Tier 1 / Strong — cryo-ET structural determination directly on patient-derived human cilia with subtomogram averaging, direct comparison of RSPH4A-/- and RSPH1-/- structural phenotypes","pmids":["33852348"],"is_preprint":false},{"year":2021,"finding":"CFAP65 forms a cytoplasmic protein network with RSPH1 (along with MNS1, TPPP2, ZPBP1 and SPACA1) during spermiogenesis, as demonstrated by endogenous co-immunoprecipitation and immunostaining in mouse testes.","method":"Endogenous co-immunoprecipitation, immunostaining, Cfap65 knockout mouse model, proteomics","journal":"Human molecular genetics","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — co-immunoprecipitation with immunostaining in KO model, single lab, multiple orthogonal methods","pmids":["34231842"],"is_preprint":false},{"year":2021,"finding":"In CFAP206-mutant patient sperm cells, immunostaining demonstrated absence of both WDR66 and RSPH1 proteins, suggesting CFAP206 is required upstream of RSPH1 for proper radial spoke assembly in sperm flagella.","method":"Immunostaining of patient sperm, CRISPR-Cas9 Cfap206 knockout mouse","journal":"Human genetics","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — direct immunostaining in patient material supported by KO mouse model, single lab","pmids":["34255152"],"is_preprint":false},{"year":2023,"finding":"Pathogenic variants in RSPH1 cause male infertility due to sperm cell dysmotility and abnormal flagellar RSPH1 protein composition; immunofluorescence microscopy of sperm flagella confirmed absence or severe reduction of RSPH1 in RSPH1-mutant individuals, and HYDIN-mutant individuals also showed MMAF, with RSPH1 flagellar composition affected.","method":"NGS genetic testing, immunofluorescence microscopy of sperm flagella, transmission electron microscopy, high-speed video microscopy, semen analysis","journal":"Frontiers in genetics","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — immunofluorescence of sperm flagella in genetically confirmed patients, multiple orthogonal diagnostics, single lab","pmids":["36873931"],"is_preprint":false},{"year":2023,"finding":"CCDC189 interacts with RSPH1 (the radial-spoke-specific protein) as shown by co-immunoprecipitation and mass spectrometry in mouse sperm axonemes; CCDC189 inactivation causes downregulation of RSPH1-associated partner CABCOCO1, placing CCDC189 as a radial-spoke-associated protein upstream of RSPH1 interactions in sperm flagellum formation.","method":"Co-immunoprecipitation, mass spectrometry, immunoelectron microscopy, Ccdc189 and Cabcoco1 knockout mice","journal":"National science review","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — Co-IP/MS identification of RSPH1 interaction, supported by immunoelectron microscopy localization and KO phenotype, single lab","pmids":["37601242"],"is_preprint":false},{"year":2011,"finding":"TSGA2 (RSPH1) was identified as a novel 14-3-3ζ binding partner in testis by tandem affinity purification followed by LC-MS/MS, suggesting RSPH1 participates in 14-3-3-regulated signaling during spermatogenesis.","method":"Tandem affinity purification (TAP) of 14-3-3ζ complexes from transgenic mouse testis, LC-MS/MS identification","journal":"Spermatogenesis","confidence":"Low","confidence_rationale":"Tier 3 / Weak — single affinity purification/MS experiment, no functional follow-up for RSPH1 specifically, single lab","pmids":["22332119"],"is_preprint":false},{"year":2005,"finding":"Mouse TSGA2 (ortholog of RSPH1) polypeptides localize in major sperm tail structures and also appear in the vicinity of the anterior acrosome; heterospecific t-complex alleles of Tsga2 carry numerous nonsynonymous mutations in otherwise conserved residues and show highly reduced testis expression, identifying Tsga2 as a candidate for the Ccub1 genetic factor underlying the 'curlicue' sperm motility abnormality.","method":"Motility assays, protein localization by immunofluorescence, genetic mapping, expression analysis","journal":"Biology of reproduction","confidence":"Low","confidence_rationale":"Tier 3 / Weak — indirect genetic candidate evidence, protein localization without functional mutagenesis rescue, single lab","pmids":["16354795"],"is_preprint":false},{"year":2024,"finding":"DNAH12 interacts with radial spoke head proteins RSPH1, RSPH9, and DNAJB13 to regulate central pair stability in sperm flagella, as demonstrated by co-immunoprecipitation in mouse models; DNAH12 deficiency leads to central pair loss in sperm but not in cilia.","method":"Co-immunoprecipitation, Dnah12 knockout and knock-in mouse models, transmission electron microscopy, immunofluorescence","journal":"bioRxiv","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — co-immunoprecipitation of RSPH1 interaction with DNAH12 supported by KO mouse phenotype showing CP loss; preprint, single lab","pmids":["bio_10.1101_2024.06.20.599934"],"is_preprint":true}],"current_model":"RSPH1 is a radial spoke head protein that localizes to the RS1 and RS2 radial spokes of the axoneme in both airway cilia and sperm flagella; it is required for assembly of the full RS head complex (including RSPH9), occupies a position downstream of RSPH4A (the core RS head scaffold) and upstream of RS3 head assembly, and its loss causes a distinctive PCD phenotype with near-normal ciliary beat frequency but abnormal circular waveform and impaired mucociliary clearance, as well as male infertility due to sperm dysmotility."},"narrative":{"mechanistic_narrative":"RSPH1 is a radial spoke head protein of the motile cilium and sperm flagellum axoneme, required for assembly of the radial spoke (RS) head complex that tethers the central pair of microtubules and shapes ciliary waveform [PMID:23993197, PMID:24518672, PMID:33852348]. It localizes within the radial spokes of sperm flagella and of tracheal and ependymal cilia [PMID:17451891], and biallelic loss-of-function mutations abolish detectable axonemal RSPH1 and cause primary ciliary dyskinesia with central-complex and radial-spoke defects [PMID:23993197]. RSPH1 occupies a defined position in a hierarchical RS-head assembly pathway: RSPH4A acts as the core scaffold whose loss prevents axonemal assembly of both RSPH1 and RSPH9, whereas loss of RSPH1 causes co-loss of RSPH9 (but not RSPH4A), and RSPH9 loss affects only RSPH9 [PMID:25789548]. Cryo-electron tomography localizes RSPH1's specific contribution to the heads of RS1 and RS2 [PMID:33852348]. Functionally, RSPH1 deficiency produces a distinctive phenotype of near-normal ciliary beat frequency with an abnormal circular beat pattern, elevated nasal nitric oxide, and relatively mild lung disease, indicating residual axonemal function [PMID:24568568]; structurally it underlies transposition of peripheral microtubules into the central-pair space with intermittent central-pair loss [PMID:24518672]. RSPH1 mutations also cause male infertility through sperm dysmotility and altered flagellar RSPH1 composition [PMID:36873931], and in the flagellum RSPH1 participates in radial-spoke and central-pair networks involving CFAP65, CCDC189, and DNAH12 [PMID:34231842, PMID:37601242].","teleology":[{"year":2007,"claim":"Established where the RSPH1 protein resides, placing it physically within axonemal radial spokes of both flagella and cilia before any disease link was known.","evidence":"EM immunocytochemistry, immunofluorescence and expression analysis in testis and ciliated tissues","pmids":["17451891"],"confidence":"Medium","gaps":["No functional consequence of localization tested","Significance of the 38 vs 44 kDa sperm processing unresolved"]},{"year":2013,"claim":"Linked RSPH1 to human disease, showing loss-of-function mutations abolish axonemal RSPH1 and cause PCD with central-complex and radial-spoke defects, establishing RSPH1 as required for RS/CC assembly.","evidence":"Homozygosity mapping, whole-exome sequencing and immunofluorescence of airway cilia across 10 families","pmids":["23993197"],"confidence":"High","gaps":["Did not resolve which other RS subunits depend on RSPH1","Mechanism of central-complex defect not structurally defined"]},{"year":2014,"claim":"Defined the structural and functional consequence of RSPH1 loss: co-loss of RSPH4A and RSPH9 with microtubule transposition, plus a distinctive circular waveform with preserved beat frequency, indicating partial axonemal function.","evidence":"High-resolution immunofluorescence, TEM, high-speed video microscopy, nasal NO and lung function in biallelic patients","pmids":["24518672","24568568"],"confidence":"High","gaps":["Basis of residual ciliary function not explained","RS3 contribution not assessed"]},{"year":2015,"claim":"Resolved the RS-head assembly hierarchy, ordering RSPH4A as scaffold upstream of RSPH1, which is in turn upstream of RSPH9, and placed RSPH3 at the RS stalk/neck independent of RSPH1.","evidence":"Systematic immunofluorescence across RSPH9/RSPH4A/RSPH1 and RSPH3-mutant patient cilia","pmids":["25789548","26073779"],"confidence":"High","gaps":["Direct biochemical interactions among RS-head proteins not shown","No reconstitution of assembly order in vitro"]},{"year":2021,"claim":"Provided sub-axonemal structural resolution by cryo-ET, mapping RSPH1's contribution specifically to the heads of RS1 and RS2 and distinguishing it from RSPH4A's broader arch-domain role.","evidence":"Cryo-electron tomography and subtomogram averaging of patient-derived RSPH1-/- and RSPH4A-/- cilia","pmids":["33852348"],"confidence":"High","gaps":["Atomic-resolution placement of RSPH1 within the head not determined","Functional link between RS1/RS2 head loss and waveform defect not mechanistically dissected"]},{"year":2021,"claim":"Extended RSPH1 biology to spermiogenesis, identifying cytoplasmic and flagellar networks (CFAP65, CFAP206) acting upstream of or alongside RSPH1 in sperm radial spoke assembly.","evidence":"Endogenous co-IP, immunostaining and KO mouse models for CFAP65 and CFAP206","pmids":["34231842","34255152"],"confidence":"Medium","gaps":["Direct RSPH1 binding to CFAP206 not shown","Whether these interactions are flagellum-specific unresolved"]},{"year":2023,"claim":"Demonstrated that RSPH1 mutations cause male infertility through sperm dysmotility with absent or reduced flagellar RSPH1, extending the disease phenotype to reproduction.","evidence":"NGS, immunofluorescence and TEM of sperm flagella, high-speed video microscopy in patients","pmids":["36873931"],"confidence":"Medium","gaps":["Cohort from single lab","Quantitative relationship between RSPH1 loss and motility not established"]},{"year":2024,"claim":"Implicated RSPH1 in central-pair stability in sperm via interaction with DNAH12, RSPH9 and DNAJB13, linking the RS head to central-pair integrity selectively in flagella.","evidence":"Co-IP and Dnah12 KO/knock-in mouse models with TEM and immunofluorescence (preprint)","pmids":["bio_10.1101_2024.06.20.599934"],"confidence":"Medium","gaps":["Preprint, single lab","Why central-pair loss occurs in sperm but not cilia unexplained"]},{"year":null,"claim":"It remains unresolved how RSPH1-bearing RS heads of RS1/RS2 mechanically constrain the central pair to produce normal versus circular ciliary waveform, and what distinguishes the flagellar from the ciliary requirement.","evidence":"","pmids":[],"confidence":"Medium","gaps":["No atomic-resolution RS-head model with RSPH1 placed","Mechanism converting head loss to waveform change unknown","Tissue-specific differences in central-pair dependence unexplained"]}],"mechanism_profile":{"molecular_activity":[{"term_id":"GO:0005198","term_label":"structural molecule activity","supporting_discovery_ids":[2,6]}],"localization":[{"term_id":"GO:0005929","term_label":"cilium","supporting_discovery_ids":[0,1,2]},{"term_id":"GO:0005856","term_label":"cytoskeleton","supporting_discovery_ids":[0,6]}],"pathway":[{"term_id":"R-HSA-1852241","term_label":"Organelle biogenesis and maintenance","supporting_discovery_ids":[2,6]},{"term_id":"R-HSA-1474165","term_label":"Reproduction","supporting_discovery_ids":[9]}],"complexes":["axonemal radial spoke head (RS1/RS2)"],"partners":["RSPH4A","RSPH9","CFAP65","CCDC189","DNAH12","DNAJB13"],"other_free_text":[]}},"prefetch_data":{"uniprot":{"accession":"Q8WYR4","full_name":"Radial spoke head 1 homolog","aliases":["Cancer/testis antigen 79","CT79","Male meiotic metaphase chromosome-associated acidic protein","Meichroacidin","Testis-specific gene A2 protein"],"length_aa":309,"mass_kda":35.1,"function":"Functions as part of axonemal radial spoke complexes that play an important part in the motility of sperm and cilia","subcellular_location":"Cytoplasm; Chromosome; Cytoplasm, cytoskeleton, cilium axoneme; Cytoplasm, cytoskeleton, flagellum axoneme","url":"https://www.uniprot.org/uniprotkb/Q8WYR4/entry"},"depmap":{"release":"DepMap","has_data":true,"is_common_essential":false,"resolved_as":"","url":"https://depmap.org/portal/gene/RSPH1","classification":"Not Classified","n_dependent_lines":1,"n_total_lines":1208,"dependency_fraction":0.0008278145695364238},"opencell":{"profiled":false,"resolved_as":"","ensg_id":"","cell_line_id":"","localizations":[],"interactors":[],"url":"https://opencell.sf.czbiohub.org/search/RSPH1","total_profiled":1310},"omim":[{"mim_id":"621376","title":"CILIA- AND FLAGELLA-ASSOCIATED PROTEIN 206; CFAP206","url":"https://www.omim.org/entry/621376"},{"mim_id":"617593","title":"SPERMATOGENIC FAILURE 20; SPGF20","url":"https://www.omim.org/entry/617593"},{"mim_id":"617592","title":"SPERMATOGENIC FAILURE 19; SPGF19","url":"https://www.omim.org/entry/617592"},{"mim_id":"616481","title":"CILIARY DYSKINESIA, PRIMARY, 32; CILD32","url":"https://www.omim.org/entry/616481"},{"mim_id":"615876","title":"RADIAL SPOKE HEAD 3; RSPH3","url":"https://www.omim.org/entry/615876"}],"hpa":{"profiled":true,"resolved_as":"","reliability":"Uncertain","locations":[{"location":"Centrosome","reliability":"Uncertain"},{"location":"Basal body","reliability":"Uncertain"},{"location":"Mid piece","reliability":"Uncertain"},{"location":"Acrosome","reliability":"Additional"}],"tissue_specificity":"Tissue enhanced","tissue_distribution":"Detected in many","driving_tissues":[{"tissue":"choroid plexus","ntpm":108.8},{"tissue":"fallopian tube","ntpm":151.8}],"url":"https://www.proteinatlas.org/search/RSPH1"},"hgnc":{"alias_symbol":["FLJ32753","RSP44","RSPH10A","CILD24"],"prev_symbol":["TSGA2"]},"alphafold":{"accession":"Q8WYR4","domains":[{"cath_id":"2.20.110.10","chopping":"19-108","consensus_level":"medium","plddt":96.7663,"start":19,"end":108},{"cath_id":"2.20.110","chopping":"110-190_208-217","consensus_level":"medium","plddt":94.8774,"start":110,"end":217}],"viewer_url":"https://alphafold.ebi.ac.uk/entry/Q8WYR4","model_url":"https://alphafold.ebi.ac.uk/files/AF-Q8WYR4-F1-model_v6.cif","pae_url":"https://alphafold.ebi.ac.uk/files/AF-Q8WYR4-F1-predicted_aligned_error_v6.png","plddt_mean":74.19},"mouse_models":{"mgi_url":"https://www.informatics.jax.org/marker/summary?nomen=RSPH1","jax_strain_url":"https://www.jax.org/strain/search?query=RSPH1"},"sequence":{"accession":"Q8WYR4","fasta_url":"https://rest.uniprot.org/uniprotkb/Q8WYR4.fasta","uniprot_url":"https://www.uniprot.org/uniprotkb/Q8WYR4/entry","alphafold_viewer_url":"https://alphafold.ebi.ac.uk/entry/Q8WYR4"}},"corpus_meta":[{"pmid":"24568568","id":"PMC_24568568","title":"Mutations 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sperm (38 kDa isoform vs. 44 kDa form in somatic tissues).\",\n      \"method\": \"EM immunocytochemistry, immunofluorescence, Western blot, Northern blot, RT-PCR\",\n      \"journal\": \"Gene\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — direct subcellular localization by EM immunocytochemistry with immunofluorescence corroboration, single lab, multiple orthogonal methods\",\n      \"pmids\": [\"17451891\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2013,\n      \"finding\": \"Loss-of-function mutations in RSPH1 cause primary ciliary dyskinesia with central-complex (CC) and radial-spoke (RS) defects; wild-type RSPH1 localizes within cilia of airway cells but is undetectable in cilia from individuals with RSPH1 loss-of-function mutations, establishing that RSPH1 is required for proper assembly of CCs and RSs in human airway cilia.\",\n      \"method\": \"Homozygosity mapping, whole-exome sequencing, immunofluorescence of airway cilia, high-speed video microscopy, transcript analysis from airway cells\",\n      \"journal\": \"American journal of human genetics\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — immunofluorescence localization linked to functional defect, replicated across 10 independent families, multiple orthogonal methods\",\n      \"pmids\": [\"23993197\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2014,\n      \"finding\": \"RSPH1 mutations result in loss of the entire radial spoke head structure from cilia: high-resolution immunofluorescence of RSPH1-mutated cilia revealed co-loss of RSPH4A and RSPH9 along with RSPH1, and ultrastructural analysis showed transposition of peripheral outer microtubules into the empty central pair space with intermittent central pair loss, suggesting RSPH1 is required for tethering central microtubules via radial spoke heads.\",\n      \"method\": \"Targeted NGS panel, high-resolution immunofluorescence microscopy, transmission electron microscopy\",\n      \"journal\": \"Human molecular genetics\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — direct immunofluorescence showing co-loss of multiple RS head proteins, corroborated by ultrastructural EM, two orthogonal methods\",\n      \"pmids\": [\"24518672\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2014,\n      \"finding\": \"Biallelic loss-of-function mutations in RSPH1 cause PCD with a unique phenotype: cilia show normal beat frequency but an abnormal circular beat pattern, higher nasal nitric oxide levels, and milder lung disease compared to other PCD genotypes, indicating residual ciliary function despite RSPH1 loss.\",\n      \"method\": \"Whole-exome sequencing, Sanger sequencing, high-speed video microscopy of ciliary beat, nasal nitric oxide measurement, lung function testing\",\n      \"journal\": \"American journal of respiratory and critical care medicine\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — functional ciliary beat analysis in 16 individuals with biallelic mutations, replicated across multiple families with orthogonal genotypic and phenotypic methods\",\n      \"pmids\": [\"24568568\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2015,\n      \"finding\": \"RSPH4A is the core protein of the radial spoke head: absence of RSPH4A (due to RSPH4A mutations) results in deficient axonemal assembly of both RSPH1 and RSPH9. Conversely, RSPH1 mutations cause loss of RSPH9 from the axoneme but not RSPH4A, while RSPH9 mutations cause loss of RSPH9 alone without affecting RSPH1 or RSPH4A assembly, defining a hierarchical assembly order for the RS head complex.\",\n      \"method\": \"High-resolution immunofluorescence analysis of respiratory cilia in 21 individuals with biallelic mutations in RSPH9, RSPH4A, and RSPH1\",\n      \"journal\": \"American journal of respiratory cell and molecular biology\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — systematic immunofluorescence across three gene-mutant groups in 16 families, orthogonal to genetic data, single lab but large cohort with internal controls\",\n      \"pmids\": [\"25789548\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2015,\n      \"finding\": \"RSPH3 mutations cause loss of RSPH3 from cilia while RSPH23 (RS-neck protein), RSPH1 and RSPH4A (RS-head proteins) remain present within cilia, placing RSPH3 at the RS stalk/neck upstream of the RS head proteins and demonstrating that RSPH1 and RSPH4A can assemble independently of RSPH3.\",\n      \"method\": \"Immunofluorescence of respiratory epithelial cells from RSPH3-mutant individuals\",\n      \"journal\": \"American journal of human genetics\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — direct immunofluorescence localization in patient-derived cells, single lab, negative result for RSPH1 loss in RSPH3-mutant context is mechanistically informative\",\n      \"pmids\": [\"26073779\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2021,\n      \"finding\": \"In RSPH4A-/- human respiratory cilia, cryo-electron tomography revealed loss of radial spoke heads of RS1 and RS2 (but not RS3) with additional defects in arch domains adjacent to RS1 and RS2 heads — a pattern similar to but distinct from RSPH1-/- cilia (which lacked RS1 and RS2 heads without arch domain defects), providing structural resolution of RSPH1's specific contribution to the RS head of RS1 and RS2.\",\n      \"method\": \"Cryo-electron tomography (cryo-ET) and subtomogram averaging of patient-derived human respiratory cilia\",\n      \"journal\": \"Molecular biology of the cell\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 / Strong — cryo-ET structural determination directly on patient-derived human cilia with subtomogram averaging, direct comparison of RSPH4A-/- and RSPH1-/- structural phenotypes\",\n      \"pmids\": [\"33852348\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2021,\n      \"finding\": \"CFAP65 forms a cytoplasmic protein network with RSPH1 (along with MNS1, TPPP2, ZPBP1 and SPACA1) during spermiogenesis, as demonstrated by endogenous co-immunoprecipitation and immunostaining in mouse testes.\",\n      \"method\": \"Endogenous co-immunoprecipitation, immunostaining, Cfap65 knockout mouse model, proteomics\",\n      \"journal\": \"Human molecular genetics\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — co-immunoprecipitation with immunostaining in KO model, single lab, multiple orthogonal methods\",\n      \"pmids\": [\"34231842\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2021,\n      \"finding\": \"In CFAP206-mutant patient sperm cells, immunostaining demonstrated absence of both WDR66 and RSPH1 proteins, suggesting CFAP206 is required upstream of RSPH1 for proper radial spoke assembly in sperm flagella.\",\n      \"method\": \"Immunostaining of patient sperm, CRISPR-Cas9 Cfap206 knockout mouse\",\n      \"journal\": \"Human genetics\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — direct immunostaining in patient material supported by KO mouse model, single lab\",\n      \"pmids\": [\"34255152\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2023,\n      \"finding\": \"Pathogenic variants in RSPH1 cause male infertility due to sperm cell dysmotility and abnormal flagellar RSPH1 protein composition; immunofluorescence microscopy of sperm flagella confirmed absence or severe reduction of RSPH1 in RSPH1-mutant individuals, and HYDIN-mutant individuals also showed MMAF, with RSPH1 flagellar composition affected.\",\n      \"method\": \"NGS genetic testing, immunofluorescence microscopy of sperm flagella, transmission electron microscopy, high-speed video microscopy, semen analysis\",\n      \"journal\": \"Frontiers in genetics\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — immunofluorescence of sperm flagella in genetically confirmed patients, multiple orthogonal diagnostics, single lab\",\n      \"pmids\": [\"36873931\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2023,\n      \"finding\": \"CCDC189 interacts with RSPH1 (the radial-spoke-specific protein) as shown by co-immunoprecipitation and mass spectrometry in mouse sperm axonemes; CCDC189 inactivation causes downregulation of RSPH1-associated partner CABCOCO1, placing CCDC189 as a radial-spoke-associated protein upstream of RSPH1 interactions in sperm flagellum formation.\",\n      \"method\": \"Co-immunoprecipitation, mass spectrometry, immunoelectron microscopy, Ccdc189 and Cabcoco1 knockout mice\",\n      \"journal\": \"National science review\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — Co-IP/MS identification of RSPH1 interaction, supported by immunoelectron microscopy localization and KO phenotype, single lab\",\n      \"pmids\": [\"37601242\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2011,\n      \"finding\": \"TSGA2 (RSPH1) was identified as a novel 14-3-3ζ binding partner in testis by tandem affinity purification followed by LC-MS/MS, suggesting RSPH1 participates in 14-3-3-regulated signaling during spermatogenesis.\",\n      \"method\": \"Tandem affinity purification (TAP) of 14-3-3ζ complexes from transgenic mouse testis, LC-MS/MS identification\",\n      \"journal\": \"Spermatogenesis\",\n      \"confidence\": \"Low\",\n      \"confidence_rationale\": \"Tier 3 / Weak — single affinity purification/MS experiment, no functional follow-up for RSPH1 specifically, single lab\",\n      \"pmids\": [\"22332119\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2005,\n      \"finding\": \"Mouse TSGA2 (ortholog of RSPH1) polypeptides localize in major sperm tail structures and also appear in the vicinity of the anterior acrosome; heterospecific t-complex alleles of Tsga2 carry numerous nonsynonymous mutations in otherwise conserved residues and show highly reduced testis expression, identifying Tsga2 as a candidate for the Ccub1 genetic factor underlying the 'curlicue' sperm motility abnormality.\",\n      \"method\": \"Motility assays, protein localization by immunofluorescence, genetic mapping, expression analysis\",\n      \"journal\": \"Biology of reproduction\",\n      \"confidence\": \"Low\",\n      \"confidence_rationale\": \"Tier 3 / Weak — indirect genetic candidate evidence, protein localization without functional mutagenesis rescue, single lab\",\n      \"pmids\": [\"16354795\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2024,\n      \"finding\": \"DNAH12 interacts with radial spoke head proteins RSPH1, RSPH9, and DNAJB13 to regulate central pair stability in sperm flagella, as demonstrated by co-immunoprecipitation in mouse models; DNAH12 deficiency leads to central pair loss in sperm but not in cilia.\",\n      \"method\": \"Co-immunoprecipitation, Dnah12 knockout and knock-in mouse models, transmission electron microscopy, immunofluorescence\",\n      \"journal\": \"bioRxiv\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — co-immunoprecipitation of RSPH1 interaction with DNAH12 supported by KO mouse phenotype showing CP loss; preprint, single lab\",\n      \"pmids\": [\"bio_10.1101_2024.06.20.599934\"],\n      \"is_preprint\": true\n    }\n  ],\n  \"current_model\": \"RSPH1 is a radial spoke head protein that localizes to the RS1 and RS2 radial spokes of the axoneme in both airway cilia and sperm flagella; it is required for assembly of the full RS head complex (including RSPH9), occupies a position downstream of RSPH4A (the core RS head scaffold) and upstream of RS3 head assembly, and its loss causes a distinctive PCD phenotype with near-normal ciliary beat frequency but abnormal circular waveform and impaired mucociliary clearance, as well as male infertility due to sperm dysmotility.\"\n}\n```","stage2_raw":"{\n  \"mechanistic_narrative\": \"RSPH1 is a radial spoke head protein of the motile cilium and sperm flagellum axoneme, required for assembly of the radial spoke (RS) head complex that tethers the central pair of microtubules and shapes ciliary waveform [#1, #2, #6]. It localizes within the radial spokes of sperm flagella and of tracheal and ependymal cilia [#0], and biallelic loss-of-function mutations abolish detectable axonemal RSPH1 and cause primary ciliary dyskinesia with central-complex and radial-spoke defects [#1]. RSPH1 occupies a defined position in a hierarchical RS-head assembly pathway: RSPH4A acts as the core scaffold whose loss prevents axonemal assembly of both RSPH1 and RSPH9, whereas loss of RSPH1 causes co-loss of RSPH9 (but not RSPH4A), and RSPH9 loss affects only RSPH9 [#4]. Cryo-electron tomography localizes RSPH1's specific contribution to the heads of RS1 and RS2 [#6]. Functionally, RSPH1 deficiency produces a distinctive phenotype of near-normal ciliary beat frequency with an abnormal circular beat pattern, elevated nasal nitric oxide, and relatively mild lung disease, indicating residual axonemal function [#3]; structurally it underlies transposition of peripheral microtubules into the central-pair space with intermittent central-pair loss [#2]. RSPH1 mutations also cause male infertility through sperm dysmotility and altered flagellar RSPH1 composition [#9], and in the flagellum RSPH1 participates in radial-spoke and central-pair networks involving CFAP65, CCDC189, and DNAH12 [#7, #10].\",\n  \"teleology\": [\n    {\n      \"year\": 2007,\n      \"claim\": \"Established where the RSPH1 protein resides, placing it physically within axonemal radial spokes of both flagella and cilia before any disease link was known.\",\n      \"evidence\": \"EM immunocytochemistry, immunofluorescence and expression analysis in testis and ciliated tissues\",\n      \"pmids\": [\"17451891\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"No functional consequence of localization tested\", \"Significance of the 38 vs 44 kDa sperm processing unresolved\"]\n    },\n    {\n      \"year\": 2013,\n      \"claim\": \"Linked RSPH1 to human disease, showing loss-of-function mutations abolish axonemal RSPH1 and cause PCD with central-complex and radial-spoke defects, establishing RSPH1 as required for RS/CC assembly.\",\n      \"evidence\": \"Homozygosity mapping, whole-exome sequencing and immunofluorescence of airway cilia across 10 families\",\n      \"pmids\": [\"23993197\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Did not resolve which other RS subunits depend on RSPH1\", \"Mechanism of central-complex defect not structurally defined\"]\n    },\n    {\n      \"year\": 2014,\n      \"claim\": \"Defined the structural and functional consequence of RSPH1 loss: co-loss of RSPH4A and RSPH9 with microtubule transposition, plus a distinctive circular waveform with preserved beat frequency, indicating partial axonemal function.\",\n      \"evidence\": \"High-resolution immunofluorescence, TEM, high-speed video microscopy, nasal NO and lung function in biallelic patients\",\n      \"pmids\": [\"24518672\", \"24568568\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Basis of residual ciliary function not explained\", \"RS3 contribution not assessed\"]\n    },\n    {\n      \"year\": 2015,\n      \"claim\": \"Resolved the RS-head assembly hierarchy, ordering RSPH4A as scaffold upstream of RSPH1, which is in turn upstream of RSPH9, and placed RSPH3 at the RS stalk/neck independent of RSPH1.\",\n      \"evidence\": \"Systematic immunofluorescence across RSPH9/RSPH4A/RSPH1 and RSPH3-mutant patient cilia\",\n      \"pmids\": [\"25789548\", \"26073779\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Direct biochemical interactions among RS-head proteins not shown\", \"No reconstitution of assembly order in vitro\"]\n    },\n    {\n      \"year\": 2021,\n      \"claim\": \"Provided sub-axonemal structural resolution by cryo-ET, mapping RSPH1's contribution specifically to the heads of RS1 and RS2 and distinguishing it from RSPH4A's broader arch-domain role.\",\n      \"evidence\": \"Cryo-electron tomography and subtomogram averaging of patient-derived RSPH1-/- and RSPH4A-/- cilia\",\n      \"pmids\": [\"33852348\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Atomic-resolution placement of RSPH1 within the head not determined\", \"Functional link between RS1/RS2 head loss and waveform defect not mechanistically dissected\"]\n    },\n    {\n      \"year\": 2021,\n      \"claim\": \"Extended RSPH1 biology to spermiogenesis, identifying cytoplasmic and flagellar networks (CFAP65, CFAP206) acting upstream of or alongside RSPH1 in sperm radial spoke assembly.\",\n      \"evidence\": \"Endogenous co-IP, immunostaining and KO mouse models for CFAP65 and CFAP206\",\n      \"pmids\": [\"34231842\", \"34255152\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Direct RSPH1 binding to CFAP206 not shown\", \"Whether these interactions are flagellum-specific unresolved\"]\n    },\n    {\n      \"year\": 2023,\n      \"claim\": \"Demonstrated that RSPH1 mutations cause male infertility through sperm dysmotility with absent or reduced flagellar RSPH1, extending the disease phenotype to reproduction.\",\n      \"evidence\": \"NGS, immunofluorescence and TEM of sperm flagella, high-speed video microscopy in patients\",\n      \"pmids\": [\"36873931\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Cohort from single lab\", \"Quantitative relationship between RSPH1 loss and motility not established\"]\n    },\n    {\n      \"year\": 2024,\n      \"claim\": \"Implicated RSPH1 in central-pair stability in sperm via interaction with DNAH12, RSPH9 and DNAJB13, linking the RS head to central-pair integrity selectively in flagella.\",\n      \"evidence\": \"Co-IP and Dnah12 KO/knock-in mouse models with TEM and immunofluorescence (preprint)\",\n      \"pmids\": [\"bio_10.1101_2024.06.20.599934\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Preprint, single lab\", \"Why central-pair loss occurs in sperm but not cilia unexplained\"]\n    },\n    {\n      \"year\": null,\n      \"claim\": \"It remains unresolved how RSPH1-bearing RS heads of RS1/RS2 mechanically constrain the central pair to produce normal versus circular ciliary waveform, and what distinguishes the flagellar from the ciliary requirement.\",\n      \"evidence\": \"\",\n      \"pmids\": [],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"No atomic-resolution RS-head model with RSPH1 placed\", \"Mechanism converting head loss to waveform change unknown\", \"Tissue-specific differences in central-pair dependence unexplained\"]\n    }\n  ],\n  \"mechanism_profile\": {\n    \"molecular_activity\": [\n      {\"term_id\": \"GO:0005198\", \"supporting_discovery_ids\": [2, 6]}\n    ],\n    \"localization\": [\n      {\"term_id\": \"GO:0005929\", \"supporting_discovery_ids\": [0, 1, 2]},\n      {\"term_id\": \"GO:0005856\", \"supporting_discovery_ids\": [0, 6]}\n    ],\n    \"pathway\": [\n      {\"term_id\": \"R-HSA-1852241\", \"supporting_discovery_ids\": [2, 6]},\n      {\"term_id\": \"R-HSA-1474165\", \"supporting_discovery_ids\": [9]}\n    ],\n    \"complexes\": [\"axonemal radial spoke head (RS1/RS2)\"],\n    \"partners\": [\"RSPH4A\", \"RSPH9\", \"CFAP65\", \"CCDC189\", \"DNAH12\", \"DNAJB13\"],\n    \"other_free_text\": []\n  }\n}","audit_flag":null,"evaluation":{"pairwise":"win","faith_supported":6,"faith_total":6,"faith_pct":100.0}}