{"gene":"RSPH1","run_date":"2026-04-28T20:42:06","timeline":{"discoveries":[{"year":2007,"finding":"RSPH1 (human meichroacidin/RSP44) protein localizes within the radial spokes of the axonemal complex of sperm flagella and in cilia of tracheal and ependymal epithelial cells, as determined by EM immunocytochemistry and immunofluorescence, establishing it as a radial spoke structural component.","method":"EM immunocytochemistry, immunofluorescence, Western blot, Northern blot","journal":"Gene","confidence":"High","confidence_rationale":"Tier 2 — direct localization by EM immunocytochemistry with functional context in axonemal radial spokes, replicated across multiple tissue types","pmids":["17451891"],"is_preprint":false},{"year":2013,"finding":"Loss-of-function mutations in RSPH1 cause primary ciliary dyskinesia with central-complex and radial-spoke defects; wild-type RSPH1 localizes within cilia of airway cells but is undetectable in cilia from individuals with RSPH1 loss-of-function mutations, demonstrating RSPH1 is required for proper assembly of central complexes and radial spokes in human airway cilia.","method":"Homozygosity mapping, whole-exome sequencing, immunofluorescence localization in airway cells, high-speed videomicroscopy","journal":"American journal of human genetics","confidence":"High","confidence_rationale":"Tier 2 — direct localization with functional loss-of-function phenotype, replicated in multiple families","pmids":["23993197"],"is_preprint":false},{"year":2014,"finding":"RSPH1 mutations cause loss of RSPH4A and RSPH9 from mutant cilia by high-resolution immunofluorescence, suggesting RSPH1 is required for assembly of the entire radial spoke head structure; central pair microtubule loss in RSPH1-mutant cilia is proposed to result from instability due to loss of radial spoke head tethering.","method":"Targeted NGS panel, high-resolution immunofluorescence, ultrastructural analysis (TEM)","journal":"Human molecular genetics","confidence":"High","confidence_rationale":"Tier 2 — reciprocal immunofluorescence demonstrating loss of multiple RS head components, replicated in two families","pmids":["24518672"],"is_preprint":false},{"year":2014,"finding":"Biallelic loss-of-function mutations in RSPH1 cause PCD with a unique phenotype: cilia exhibit normal beat frequency but an abnormal circular beat pattern, indicating RSPH1 is required for normal ciliary waveform rather than beat frequency per se.","method":"Exome sequencing, Sanger sequencing, high-speed videomicroscopy of nasal cilia","journal":"American journal of respiratory and critical care medicine","confidence":"High","confidence_rationale":"Tier 2 — direct functional measurement of ciliary beat pattern in multiple RSPH1-mutant individuals, replicated across families","pmids":["24568568"],"is_preprint":false},{"year":2015,"finding":"Immunofluorescence analysis of human respiratory cilia showed that absence of RSPH4A results in deficient axonemal assembly of both RSPH1 and RSPH9; RSPH1 mutant cilia lacking RSPH1 fail to assemble RSPH9; whereas RSPH9 mutations result in absence of RSPH9 but do not affect RSPH1 or RSPH4A assembly. This establishes an assembly hierarchy: RSPH4A is the core RS head protein, RSPH1 is required downstream for RSPH9 recruitment.","method":"High-resolution immunofluorescence analysis of human respiratory cilia from PCD patients with defined mutations","journal":"American journal of respiratory cell and molecular biology","confidence":"High","confidence_rationale":"Tier 2 — systematic immunofluorescence across multiple genotypes establishing assembly hierarchy, replicated in 16 families","pmids":["25789548"],"is_preprint":false},{"year":2015,"finding":"RSPH3 mutations result in near absence of radial spokes but RSPH1 and RSPH4A (RS head proteins) remain present within cilia, placing RSPH3 (RS stalk) upstream of RS head assembly including RSPH1 in the radial spoke assembly pathway.","method":"Immunofluorescence of airway cells from RSPH3-mutant individuals, high-speed videomicroscopy, TEM","journal":"American journal of human genetics","confidence":"Medium","confidence_rationale":"Tier 2 — immunofluorescence epistasis placing RSPH1 downstream of RSPH3 in RS assembly, single lab","pmids":["26073779"],"is_preprint":false},{"year":2021,"finding":"Cryo-electron tomography of RSPH4A-/- human respiratory cilia revealed that radial spoke heads of RS1 and RS2 (but not RS3) are missing, similarly to RSPH1-/- cilia, but RSPH4A-/- cilia additionally show defects in arch domains adjacent to RS1 and RS2 heads not seen with RSPH1 loss, structurally distinguishing the contributions of RSPH4A and RSPH1 to the radial spoke head.","method":"Cryo-electron tomography (cryo-ET) and subtomogram averaging of patient cilia","journal":"Molecular biology of the cell","confidence":"High","confidence_rationale":"Tier 1 — cryo-ET structural determination directly comparing RSPH4A-/- and RSPH1-/- cilia at nanometer resolution","pmids":["33852348"],"is_preprint":false},{"year":2021,"finding":"CFAP65 forms a cytoplasmic protein network with MNS1, RSPH1, TPPP2, ZPBP1 and SPACA1 during spermiogenesis, as shown by endogenous co-immunoprecipitation and immunostaining in mouse testes, suggesting RSPH1 participates in a cytoplasmic complex prior to axonemal incorporation.","method":"Endogenous co-immunoprecipitation, immunostaining, Cfap65 knockout mouse model","journal":"Human molecular genetics","confidence":"Medium","confidence_rationale":"Tier 3 — single Co-IP identifying RSPH1 as part of a cytoplasmic complex, moderate evidence from one lab","pmids":["34231842"],"is_preprint":false},{"year":2021,"finding":"In a CFAP206-deficient patient, immunostaining of sperm cells demonstrated absence of both WDR66 and RSPH1 proteins, indicating that CFAP206 (a microtubule-docking adapter for radial spoke and inner dynein arm) is required for RSPH1 localization to the sperm flagellum axoneme.","method":"Immunostaining of patient sperm cells, CRISPR-Cas9 Cfap206 KO mouse model","journal":"Human genetics","confidence":"Medium","confidence_rationale":"Tier 2 — direct immunostaining showing loss of RSPH1 in CFAP206-deficient cells, 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 composition, demonstrated by immunofluorescence microscopy of sperm flagella from infertile men with RSPH1 mutations; this is the first direct demonstration that RSPH1 variants cause male infertility via flagellar dysfunction.","method":"Immunofluorescence microscopy of sperm flagella, high-speed video microscopy, TEM, NGS","journal":"Frontiers in genetics","confidence":"High","confidence_rationale":"Tier 2 — direct immunofluorescence of sperm flagella with functional motility analysis in RSPH1-mutant individuals","pmids":["36873931"],"is_preprint":false},{"year":2023,"finding":"CCDC189 (a radial-spoke-associated protein) interacts with RSPH1 in sperm axoneme, as demonstrated by co-immunoprecipitation and mass spectrometry, and inactivation of CCDC189 causes downregulation of both CABCOCO1 and indirectly involves RSPH1 in sperm flagellum formation.","method":"Co-immunoprecipitation, mass spectrometry, immunoelectron microscopy, Ccdc189 knockout mouse","journal":"National science review","confidence":"Medium","confidence_rationale":"Tier 3 — Co-IP showing RSPH1 interaction with CCDC189 in sperm axoneme, single lab","pmids":["37601242"],"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; DNAH12 deficiency leads to central pair loss in sperm but not cilia, placing RSPH1 in a DNAH12-dependent pathway for CP stability.","method":"Co-immunoprecipitation, Dnah12 knockout and knockin mouse models, TEM, immunofluorescence","journal":"bioRxiv","confidence":"Medium","confidence_rationale":"Tier 3 — Co-IP identifying RSPH1 interaction with DNAH12 in flagella, preprint not yet peer-reviewed","pmids":["bio_10.1101_2024.06.20.599934"],"is_preprint":true},{"year":2011,"finding":"RSPH1 (TSGA2) was identified as a 14-3-3 binding protein 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) with transgenic 14-3-3ζ mice, LC-MS/MS","journal":"Spermatogenesis","confidence":"Low","confidence_rationale":"Tier 3 — single affinity purification/MS identification without functional follow-up of RSPH1 interaction","pmids":["22332119"],"is_preprint":false},{"year":2005,"finding":"TSGA2 (mouse ortholog of RSPH1) polypeptides localize to major sperm tail structures and apparently to the vicinity of the anterior acrosome in mouse sperm, as shown by protein localization studies; the heterospecific t-complex allele of Tsga2 carries numerous nonsynonymous mutations in conserved residues and shows reduced testis expression, associating Tsga2 with the 'curlicue' flagellar waveform abnormality in t/t male mice.","method":"Sperm protein extraction, protein localization studies, genetic mapping in heterospecific t-complex mice","journal":"Biology of reproduction","confidence":"Medium","confidence_rationale":"Tier 2 — direct protein localization combined with genetic epistasis mapping in mouse model","pmids":["16354795"],"is_preprint":false},{"year":2022,"finding":"SPEF2 interacts with RSPH9 (a radial spoke component closely related to RSPH1) in vitro; proteomic analysis of SPEF2-mutant patient sperm showed reduced RSPH1 expression, placing RSPH1 downstream of SPEF2 in sperm flagellar assembly.","method":"Proteomic analysis of patient sperm, Western blot, in vitro interaction assay","journal":"Asian journal of andrology","confidence":"Low","confidence_rationale":"Tier 3 — proteomics showing RSPH1 reduction in SPEF2 mutants; interaction shown for RSPH9 not RSPH1 directly","pmids":["34755699"],"is_preprint":false}],"current_model":"RSPH1 is a radial spoke head protein that localizes to RS1 and RS2 (but not RS3) within the 9+2 axoneme of motile cilia and sperm flagella, where it is required downstream of RSPH4A (the core RS head protein) for recruitment of RSPH9 and maintenance of the entire radial spoke head structure; loss of RSPH1 disrupts central pair microtubule stability and converts normal planar ciliary beating into an abnormal circular waveform without abolishing beat frequency, causing primary ciliary dyskinesia and male infertility."},"narrative":{"teleology":[{"year":2005,"claim":"Initial localization of the RSPH1 ortholog (Tsga2) to sperm tail structures and genetic association with the 'curlicue' flagellar waveform defect in t-complex mice established RSPH1 as a candidate flagellar function gene.","evidence":"Protein localization and genetic mapping in heterospecific t-complex mouse sperm","pmids":["16354795"],"confidence":"Medium","gaps":["No direct loss-of-function model for Tsga2 was generated","Acrosomal localization was uncertain","Mechanism linking t-allele mutations to waveform defect was not determined"]},{"year":2007,"claim":"EM immunocytochemistry placed RSPH1 within the radial spoke structures of the axoneme across multiple ciliated and flagellated cell types, establishing it as a bona fide radial spoke component.","evidence":"EM immunocytochemistry and immunofluorescence of human sperm, tracheal, and ependymal cilia","pmids":["17451891"],"confidence":"High","gaps":["Precise position within radial spoke (head vs. stalk) was not resolved","Functional consequence of RSPH1 loss was unknown"]},{"year":2013,"claim":"Identification of loss-of-function RSPH1 mutations as a cause of primary ciliary dyskinesia with central complex and radial spoke defects demonstrated that RSPH1 is essential for motile cilia function in humans.","evidence":"Homozygosity mapping, exome sequencing, and immunofluorescence in airway cells from multiple PCD families","pmids":["23993197"],"confidence":"High","gaps":["Whether the central pair defect was a direct or secondary consequence of radial spoke head loss was unresolved","The specific structural role within the RS head was not defined"]},{"year":2014,"claim":"Functional analysis of RSPH1-mutant cilia revealed that loss of RSPH1 abolishes normal planar waveform without reducing beat frequency, separating waveform regulation from beat generation and showing that RSPH1 mutations additionally cause loss of RSPH4A and RSPH9 from the axoneme.","evidence":"High-speed videomicroscopy and high-resolution immunofluorescence of nasal/airway cilia from RSPH1-mutant patients across multiple families","pmids":["24568568","24518672"],"confidence":"High","gaps":["Whether RSPH1 directly stabilizes RSPH4A or vice versa was ambiguous from immunofluorescence alone","Structural basis for central pair instability remained unresolved"]},{"year":2015,"claim":"Systematic comparison of RSPH4A-, RSPH1-, and RSPH9-mutant cilia established a linear assembly hierarchy — RSPH4A recruits RSPH1, which in turn recruits RSPH9 — defining RSPH1's position in radial spoke head biogenesis.","evidence":"High-resolution immunofluorescence across 16 PCD families with defined genotypes in RSPH4A, RSPH1, and RSPH9","pmids":["25789548"],"confidence":"High","gaps":["Direct protein–protein interactions underpinning the hierarchy were not biochemically demonstrated","Whether RSPH3 stalk protein physically contacts RSPH1 was unclear"]},{"year":2021,"claim":"Cryo-electron tomography resolved the structural impact of RSPH1 loss to the heads of RS1 and RS2 specifically (not RS3), and distinguished RSPH1's contribution from RSPH4A's by showing that RSPH4A loss additionally disrupts arch domains adjacent to RS heads.","evidence":"Cryo-ET and subtomogram averaging of RSPH1−/− and RSPH4A−/− patient respiratory cilia at nanometer resolution","pmids":["33852348"],"confidence":"High","gaps":["Atomic-resolution structure of RSPH1 within the RS head was not obtained","The identity of the arch-domain components lost in RSPH4A but not RSPH1 mutants was unknown"]},{"year":2021,"claim":"Co-immunoprecipitation revealed that RSPH1 participates in a cytoplasmic pre-assembly complex with CFAP65, MNS1, and other proteins during spermiogenesis, and that CFAP206 is required for RSPH1 localization to the sperm axoneme, identifying upstream assembly factors.","evidence":"Endogenous Co-IP in mouse testes (CFAP65 network) and immunostaining of CFAP206-deficient patient sperm","pmids":["34231842","34255152"],"confidence":"Medium","gaps":["RSPH1-CFAP65 interaction was shown by single Co-IP without reciprocal validation","Whether the cytoplasmic complex is a general RS pre-assembly intermediate or spermiogenesis-specific was not tested","The mechanism by which CFAP206 enables RSPH1 docking was not determined"]},{"year":2023,"claim":"RSPH1 mutations were shown to cause male infertility via sperm flagellar dysmotility, and RSPH1 was identified as an axonemal interaction partner of CCDC189, expanding RSPH1's known functional context from respiratory cilia to fertility.","evidence":"Immunofluorescence and high-speed video of RSPH1-mutant sperm; Co-IP and mass spectrometry of CCDC189 interactors in mouse sperm","pmids":["36873931","37601242"],"confidence":"High","gaps":["Whether RSPH1–CCDC189 interaction is direct or bridged was not established","Structural basis of flagellar versus ciliary phenotypic differences in RSPH1 mutants was not addressed"]},{"year":null,"claim":"The atomic-resolution structure of RSPH1 within the radial spoke head, its direct binding interfaces with RSPH4A and RSPH9, and the mechanism by which radial spoke head integrity stabilizes the central pair remain to be determined.","evidence":"","pmids":[],"confidence":"High","gaps":["No high-resolution (cryo-EM/crystal) structure of RSPH1 or the RS head complex exists","Direct protein–protein interaction surfaces between RSPH1 and RSPH4A/RSPH9 have not been mapped","The mechanotransduction pathway by which radial spoke heads regulate ciliary waveform planarity is uncharacterized"]}],"mechanism_profile":{"molecular_activity":[{"term_id":"GO:0005198","term_label":"structural molecule activity","supporting_discovery_ids":[0,2,6]}],"localization":[{"term_id":"GO:0005929","term_label":"cilium","supporting_discovery_ids":[0,1,2,6]},{"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":[2,4,6]}],"complexes":["Radial spoke head (RS1/RS2)"],"partners":["RSPH4A","RSPH9","CFAP65","MNS1","CCDC189","CFAP206"],"other_free_text":[]},"mechanistic_narrative":"RSPH1 is a structural component of the radial spoke head in 9+2 motile cilia and sperm flagella, essential for proper ciliary waveform and central pair microtubule stability. RSPH1 localizes to the radial spoke heads of RS1 and RS2 (but not RS3), where it functions downstream of the core head protein RSPH4A and is required for recruitment of RSPH9, establishing a defined assembly hierarchy within the radial spoke head [PMID:25789548, PMID:33852348]. Loss of RSPH1 does not abolish ciliary beat frequency but converts normal planar beating into an abnormal circular waveform, destabilizes central pair microtubules, and causes primary ciliary dyskinesia as well as male infertility due to sperm dysmotility [PMID:24568568, PMID:36873931, PMID:23993197]. In sperm flagella, RSPH1 participates in a cytoplasmic pre-assembly complex with CFAP65 and MNS1 and interacts with axonemal partners including CCDC189 and DNAH12 that contribute to central pair integrity [PMID:34231842, PMID:37601242]."},"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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Series of Patients with Primary Ciliary Dyskinesia: A Heterogeneous Disease with a Controversial Diagnosis.","date":"2025","source":"Molecular diagnosis & therapy","url":"https://pubmed.ncbi.nlm.nih.gov/40742517","citation_count":1,"is_preprint":false},{"pmid":"36159986","id":"PMC_36159986","title":"Subtyping children with asthma by clustering analysis of mRNA expression data.","date":"2022","source":"Frontiers in genetics","url":"https://pubmed.ncbi.nlm.nih.gov/36159986","citation_count":1,"is_preprint":false},{"pmid":"36820148","id":"PMC_36820148","title":"An Integrated Analysis Reveals Ciliary Abnormalities in Antrochoanal Polyps.","date":"2023","source":"Journal of inflammation research","url":"https://pubmed.ncbi.nlm.nih.gov/36820148","citation_count":1,"is_preprint":false},{"pmid":"35389161","id":"PMC_35389161","title":"Ciliary and immune dysfunctions and their genetic background in patients with non-cystic fibrosis bronchiectasis in Central Iran.","date":"2022","source":"Irish 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mice","date":"2024-06-23","source":"bioRxiv","url":"https://doi.org/10.1101/2024.06.20.599934","citation_count":0,"is_preprint":true}],"cost":{"stage1":{"model":"claude-sonnet-4-6","input_tokens":22182,"output_tokens":3531,"usd":0.059756},"stage2":{"model":"claude-opus-4-6","input_tokens":6931,"output_tokens":2342,"usd":0.139808},"total_usd":0.199564,"stage1_batch_id":"msgbatch_011rkcQdVV1RaFq9XhcG6df6","stage2_batch_id":"msgbatch_01RzgrJafdF4EWHhj5mNi6dh","note":"batch pricing = 50% of standard"},"stage1_raw":"```json\n{\n  \"discoveries\": [\n    {\n      \"year\": 2007,\n      \"finding\": \"RSPH1 (human meichroacidin/RSP44) protein localizes within the radial spokes of the axonemal complex of sperm flagella and in cilia of tracheal and ependymal epithelial cells, as determined by EM immunocytochemistry and immunofluorescence, establishing it as a radial spoke structural component.\",\n      \"method\": \"EM immunocytochemistry, immunofluorescence, Western blot, Northern blot\",\n      \"journal\": \"Gene\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 — direct localization by EM immunocytochemistry with functional context in axonemal radial spokes, replicated across multiple tissue types\",\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 and radial-spoke defects; wild-type RSPH1 localizes within cilia of airway cells but is undetectable in cilia from individuals with RSPH1 loss-of-function mutations, demonstrating RSPH1 is required for proper assembly of central complexes and radial spokes in human airway cilia.\",\n      \"method\": \"Homozygosity mapping, whole-exome sequencing, immunofluorescence localization in airway cells, high-speed videomicroscopy\",\n      \"journal\": \"American journal of human genetics\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 — direct localization with functional loss-of-function phenotype, replicated in multiple families\",\n      \"pmids\": [\"23993197\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2014,\n      \"finding\": \"RSPH1 mutations cause loss of RSPH4A and RSPH9 from mutant cilia by high-resolution immunofluorescence, suggesting RSPH1 is required for assembly of the entire radial spoke head structure; central pair microtubule loss in RSPH1-mutant cilia is proposed to result from instability due to loss of radial spoke head tethering.\",\n      \"method\": \"Targeted NGS panel, high-resolution immunofluorescence, ultrastructural analysis (TEM)\",\n      \"journal\": \"Human molecular genetics\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 — reciprocal immunofluorescence demonstrating loss of multiple RS head components, replicated in two families\",\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 exhibit normal beat frequency but an abnormal circular beat pattern, indicating RSPH1 is required for normal ciliary waveform rather than beat frequency per se.\",\n      \"method\": \"Exome sequencing, Sanger sequencing, high-speed videomicroscopy of nasal cilia\",\n      \"journal\": \"American journal of respiratory and critical care medicine\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 — direct functional measurement of ciliary beat pattern in multiple RSPH1-mutant individuals, replicated across families\",\n      \"pmids\": [\"24568568\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2015,\n      \"finding\": \"Immunofluorescence analysis of human respiratory cilia showed that absence of RSPH4A results in deficient axonemal assembly of both RSPH1 and RSPH9; RSPH1 mutant cilia lacking RSPH1 fail to assemble RSPH9; whereas RSPH9 mutations result in absence of RSPH9 but do not affect RSPH1 or RSPH4A assembly. This establishes an assembly hierarchy: RSPH4A is the core RS head protein, RSPH1 is required downstream for RSPH9 recruitment.\",\n      \"method\": \"High-resolution immunofluorescence analysis of human respiratory cilia from PCD patients with defined mutations\",\n      \"journal\": \"American journal of respiratory cell and molecular biology\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 — systematic immunofluorescence across multiple genotypes establishing assembly hierarchy, replicated in 16 families\",\n      \"pmids\": [\"25789548\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2015,\n      \"finding\": \"RSPH3 mutations result in near absence of radial spokes but RSPH1 and RSPH4A (RS head proteins) remain present within cilia, placing RSPH3 (RS stalk) upstream of RS head assembly including RSPH1 in the radial spoke assembly pathway.\",\n      \"method\": \"Immunofluorescence of airway cells from RSPH3-mutant individuals, high-speed videomicroscopy, TEM\",\n      \"journal\": \"American journal of human genetics\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 — immunofluorescence epistasis placing RSPH1 downstream of RSPH3 in RS assembly, single lab\",\n      \"pmids\": [\"26073779\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2021,\n      \"finding\": \"Cryo-electron tomography of RSPH4A-/- human respiratory cilia revealed that radial spoke heads of RS1 and RS2 (but not RS3) are missing, similarly to RSPH1-/- cilia, but RSPH4A-/- cilia additionally show defects in arch domains adjacent to RS1 and RS2 heads not seen with RSPH1 loss, structurally distinguishing the contributions of RSPH4A and RSPH1 to the radial spoke head.\",\n      \"method\": \"Cryo-electron tomography (cryo-ET) and subtomogram averaging of patient cilia\",\n      \"journal\": \"Molecular biology of the cell\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 — cryo-ET structural determination directly comparing RSPH4A-/- and RSPH1-/- cilia at nanometer resolution\",\n      \"pmids\": [\"33852348\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2021,\n      \"finding\": \"CFAP65 forms a cytoplasmic protein network with MNS1, RSPH1, TPPP2, ZPBP1 and SPACA1 during spermiogenesis, as shown by endogenous co-immunoprecipitation and immunostaining in mouse testes, suggesting RSPH1 participates in a cytoplasmic complex prior to axonemal incorporation.\",\n      \"method\": \"Endogenous co-immunoprecipitation, immunostaining, Cfap65 knockout mouse model\",\n      \"journal\": \"Human molecular genetics\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 3 — single Co-IP identifying RSPH1 as part of a cytoplasmic complex, moderate evidence from one lab\",\n      \"pmids\": [\"34231842\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2021,\n      \"finding\": \"In a CFAP206-deficient patient, immunostaining of sperm cells demonstrated absence of both WDR66 and RSPH1 proteins, indicating that CFAP206 (a microtubule-docking adapter for radial spoke and inner dynein arm) is required for RSPH1 localization to the sperm flagellum axoneme.\",\n      \"method\": \"Immunostaining of patient sperm cells, CRISPR-Cas9 Cfap206 KO mouse model\",\n      \"journal\": \"Human genetics\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 — direct immunostaining showing loss of RSPH1 in CFAP206-deficient cells, 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 composition, demonstrated by immunofluorescence microscopy of sperm flagella from infertile men with RSPH1 mutations; this is the first direct demonstration that RSPH1 variants cause male infertility via flagellar dysfunction.\",\n      \"method\": \"Immunofluorescence microscopy of sperm flagella, high-speed video microscopy, TEM, NGS\",\n      \"journal\": \"Frontiers in genetics\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 — direct immunofluorescence of sperm flagella with functional motility analysis in RSPH1-mutant individuals\",\n      \"pmids\": [\"36873931\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2023,\n      \"finding\": \"CCDC189 (a radial-spoke-associated protein) interacts with RSPH1 in sperm axoneme, as demonstrated by co-immunoprecipitation and mass spectrometry, and inactivation of CCDC189 causes downregulation of both CABCOCO1 and indirectly involves RSPH1 in sperm flagellum formation.\",\n      \"method\": \"Co-immunoprecipitation, mass spectrometry, immunoelectron microscopy, Ccdc189 knockout mouse\",\n      \"journal\": \"National science review\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 3 — Co-IP showing RSPH1 interaction with CCDC189 in sperm axoneme, single lab\",\n      \"pmids\": [\"37601242\"],\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; DNAH12 deficiency leads to central pair loss in sperm but not cilia, placing RSPH1 in a DNAH12-dependent pathway for CP stability.\",\n      \"method\": \"Co-immunoprecipitation, Dnah12 knockout and knockin mouse models, TEM, immunofluorescence\",\n      \"journal\": \"bioRxiv\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 3 — Co-IP identifying RSPH1 interaction with DNAH12 in flagella, preprint not yet peer-reviewed\",\n      \"pmids\": [\"bio_10.1101_2024.06.20.599934\"],\n      \"is_preprint\": true\n    },\n    {\n      \"year\": 2011,\n      \"finding\": \"RSPH1 (TSGA2) was identified as a 14-3-3 binding protein 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) with transgenic 14-3-3ζ mice, LC-MS/MS\",\n      \"journal\": \"Spermatogenesis\",\n      \"confidence\": \"Low\",\n      \"confidence_rationale\": \"Tier 3 — single affinity purification/MS identification without functional follow-up of RSPH1 interaction\",\n      \"pmids\": [\"22332119\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2005,\n      \"finding\": \"TSGA2 (mouse ortholog of RSPH1) polypeptides localize to major sperm tail structures and apparently to the vicinity of the anterior acrosome in mouse sperm, as shown by protein localization studies; the heterospecific t-complex allele of Tsga2 carries numerous nonsynonymous mutations in conserved residues and shows reduced testis expression, associating Tsga2 with the 'curlicue' flagellar waveform abnormality in t/t male mice.\",\n      \"method\": \"Sperm protein extraction, protein localization studies, genetic mapping in heterospecific t-complex mice\",\n      \"journal\": \"Biology of reproduction\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 — direct protein localization combined with genetic epistasis mapping in mouse model\",\n      \"pmids\": [\"16354795\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2022,\n      \"finding\": \"SPEF2 interacts with RSPH9 (a radial spoke component closely related to RSPH1) in vitro; proteomic analysis of SPEF2-mutant patient sperm showed reduced RSPH1 expression, placing RSPH1 downstream of SPEF2 in sperm flagellar assembly.\",\n      \"method\": \"Proteomic analysis of patient sperm, Western blot, in vitro interaction assay\",\n      \"journal\": \"Asian journal of andrology\",\n      \"confidence\": \"Low\",\n      \"confidence_rationale\": \"Tier 3 — proteomics showing RSPH1 reduction in SPEF2 mutants; interaction shown for RSPH9 not RSPH1 directly\",\n      \"pmids\": [\"34755699\"],\n      \"is_preprint\": false\n    }\n  ],\n  \"current_model\": \"RSPH1 is a radial spoke head protein that localizes to RS1 and RS2 (but not RS3) within the 9+2 axoneme of motile cilia and sperm flagella, where it is required downstream of RSPH4A (the core RS head protein) for recruitment of RSPH9 and maintenance of the entire radial spoke head structure; loss of RSPH1 disrupts central pair microtubule stability and converts normal planar ciliary beating into an abnormal circular waveform without abolishing beat frequency, causing primary ciliary dyskinesia and male infertility.\"\n}\n```","stage2_raw":"```json\n{\n  \"mechanistic_narrative\": \"RSPH1 is a structural component of the radial spoke head in 9+2 motile cilia and sperm flagella, essential for proper ciliary waveform and central pair microtubule stability. RSPH1 localizes to the radial spoke heads of RS1 and RS2 (but not RS3), where it functions downstream of the core head protein RSPH4A and is required for recruitment of RSPH9, establishing a defined assembly hierarchy within the radial spoke head [PMID:25789548, PMID:33852348]. Loss of RSPH1 does not abolish ciliary beat frequency but converts normal planar beating into an abnormal circular waveform, destabilizes central pair microtubules, and causes primary ciliary dyskinesia as well as male infertility due to sperm dysmotility [PMID:24568568, PMID:36873931, PMID:23993197]. In sperm flagella, RSPH1 participates in a cytoplasmic pre-assembly complex with CFAP65 and MNS1 and interacts with axonemal partners including CCDC189 and DNAH12 that contribute to central pair integrity [PMID:34231842, PMID:37601242].\",\n  \"teleology\": [\n    {\n      \"year\": 2005,\n      \"claim\": \"Initial localization of the RSPH1 ortholog (Tsga2) to sperm tail structures and genetic association with the 'curlicue' flagellar waveform defect in t-complex mice established RSPH1 as a candidate flagellar function gene.\",\n      \"evidence\": \"Protein localization and genetic mapping in heterospecific t-complex mouse sperm\",\n      \"pmids\": [\"16354795\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"No direct loss-of-function model for Tsga2 was generated\", \"Acrosomal localization was uncertain\", \"Mechanism linking t-allele mutations to waveform defect was not determined\"]\n    },\n    {\n      \"year\": 2007,\n      \"claim\": \"EM immunocytochemistry placed RSPH1 within the radial spoke structures of the axoneme across multiple ciliated and flagellated cell types, establishing it as a bona fide radial spoke component.\",\n      \"evidence\": \"EM immunocytochemistry and immunofluorescence of human sperm, tracheal, and ependymal cilia\",\n      \"pmids\": [\"17451891\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Precise position within radial spoke (head vs. stalk) was not resolved\", \"Functional consequence of RSPH1 loss was unknown\"]\n    },\n    {\n      \"year\": 2013,\n      \"claim\": \"Identification of loss-of-function RSPH1 mutations as a cause of primary ciliary dyskinesia with central complex and radial spoke defects demonstrated that RSPH1 is essential for motile cilia function in humans.\",\n      \"evidence\": \"Homozygosity mapping, exome sequencing, and immunofluorescence in airway cells from multiple PCD families\",\n      \"pmids\": [\"23993197\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Whether the central pair defect was a direct or secondary consequence of radial spoke head loss was unresolved\", \"The specific structural role within the RS head was not defined\"]\n    },\n    {\n      \"year\": 2014,\n      \"claim\": \"Functional analysis of RSPH1-mutant cilia revealed that loss of RSPH1 abolishes normal planar waveform without reducing beat frequency, separating waveform regulation from beat generation and showing that RSPH1 mutations additionally cause loss of RSPH4A and RSPH9 from the axoneme.\",\n      \"evidence\": \"High-speed videomicroscopy and high-resolution immunofluorescence of nasal/airway cilia from RSPH1-mutant patients across multiple families\",\n      \"pmids\": [\"24568568\", \"24518672\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Whether RSPH1 directly stabilizes RSPH4A or vice versa was ambiguous from immunofluorescence alone\", \"Structural basis for central pair instability remained unresolved\"]\n    },\n    {\n      \"year\": 2015,\n      \"claim\": \"Systematic comparison of RSPH4A-, RSPH1-, and RSPH9-mutant cilia established a linear assembly hierarchy — RSPH4A recruits RSPH1, which in turn recruits RSPH9 — defining RSPH1's position in radial spoke head biogenesis.\",\n      \"evidence\": \"High-resolution immunofluorescence across 16 PCD families with defined genotypes in RSPH4A, RSPH1, and RSPH9\",\n      \"pmids\": [\"25789548\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Direct protein–protein interactions underpinning the hierarchy were not biochemically demonstrated\", \"Whether RSPH3 stalk protein physically contacts RSPH1 was unclear\"]\n    },\n    {\n      \"year\": 2021,\n      \"claim\": \"Cryo-electron tomography resolved the structural impact of RSPH1 loss to the heads of RS1 and RS2 specifically (not RS3), and distinguished RSPH1's contribution from RSPH4A's by showing that RSPH4A loss additionally disrupts arch domains adjacent to RS heads.\",\n      \"evidence\": \"Cryo-ET and subtomogram averaging of RSPH1−/− and RSPH4A−/− patient respiratory cilia at nanometer resolution\",\n      \"pmids\": [\"33852348\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Atomic-resolution structure of RSPH1 within the RS head was not obtained\", \"The identity of the arch-domain components lost in RSPH4A but not RSPH1 mutants was unknown\"]\n    },\n    {\n      \"year\": 2021,\n      \"claim\": \"Co-immunoprecipitation revealed that RSPH1 participates in a cytoplasmic pre-assembly complex with CFAP65, MNS1, and other proteins during spermiogenesis, and that CFAP206 is required for RSPH1 localization to the sperm axoneme, identifying upstream assembly factors.\",\n      \"evidence\": \"Endogenous Co-IP in mouse testes (CFAP65 network) and immunostaining of CFAP206-deficient patient sperm\",\n      \"pmids\": [\"34231842\", \"34255152\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"RSPH1-CFAP65 interaction was shown by single Co-IP without reciprocal validation\", \"Whether the cytoplasmic complex is a general RS pre-assembly intermediate or spermiogenesis-specific was not tested\", \"The mechanism by which CFAP206 enables RSPH1 docking was not determined\"]\n    },\n    {\n      \"year\": 2023,\n      \"claim\": \"RSPH1 mutations were shown to cause male infertility via sperm flagellar dysmotility, and RSPH1 was identified as an axonemal interaction partner of CCDC189, expanding RSPH1's known functional context from respiratory cilia to fertility.\",\n      \"evidence\": \"Immunofluorescence and high-speed video of RSPH1-mutant sperm; Co-IP and mass spectrometry of CCDC189 interactors in mouse sperm\",\n      \"pmids\": [\"36873931\", \"37601242\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Whether RSPH1–CCDC189 interaction is direct or bridged was not established\", \"Structural basis of flagellar versus ciliary phenotypic differences in RSPH1 mutants was not addressed\"]\n    },\n    {\n      \"year\": null,\n      \"claim\": \"The atomic-resolution structure of RSPH1 within the radial spoke head, its direct binding interfaces with RSPH4A and RSPH9, and the mechanism by which radial spoke head integrity stabilizes the central pair remain to be determined.\",\n      \"evidence\": \"\",\n      \"pmids\": [],\n      \"confidence\": \"High\",\n      \"gaps\": [\"No high-resolution (cryo-EM/crystal) structure of RSPH1 or the RS head complex exists\", \"Direct protein–protein interaction surfaces between RSPH1 and RSPH4A/RSPH9 have not been mapped\", \"The mechanotransduction pathway by which radial spoke heads regulate ciliary waveform planarity is uncharacterized\"]\n    }\n  ],\n  \"mechanism_profile\": {\n    \"molecular_activity\": [\n      {\"term_id\": \"GO:0005198\", \"supporting_discovery_ids\": [0, 2, 6]}\n    ],\n    \"localization\": [\n      {\"term_id\": \"GO:0005929\", \"supporting_discovery_ids\": [0, 1, 2, 6]},\n      {\"term_id\": \"GO:0005856\", \"supporting_discovery_ids\": [0, 6]}\n    ],\n    \"pathway\": [\n      {\"term_id\": \"R-HSA-1852241\", \"supporting_discovery_ids\": [2, 4, 6]}\n    ],\n    \"complexes\": [\n      \"Radial spoke head (RS1/RS2)\"\n    ],\n    \"partners\": [\n      \"RSPH4A\",\n      \"RSPH9\",\n      \"CFAP65\",\n      \"MNS1\",\n      \"CCDC189\",\n      \"CFAP206\"\n    ],\n    \"other_free_text\": []\n  }\n}\n```"}