{"gene":"RSPH6A","run_date":"2026-04-28T20:42:06","timeline":{"discoveries":[{"year":2018,"finding":"RSPH6A (mouse ortholog of Chlamydomonas RSP6) is testis-enriched and localizes to the sperm flagellum. Rsph6a knockout male mice are infertile due to short, immotile spermatozoa. The axoneme can elongate in KO testes but is disrupted before accessory structures form, manchette removal is impaired, and RSPH9 (another radial spoke protein) disappears from KO flagella, indicating RSPH6A is essential for sperm flagellar assembly.","method":"Knockout mouse model, immunofluorescence localization, electron microscopy of axoneme ultrastructure, western blot for RSPH9 co-dependence","journal":"Journal of cell science","confidence":"High","confidence_rationale":"Tier 2 — clean KO with defined cellular and structural phenotypes, multiple orthogonal methods, replicated dependency of RSPH9 on RSPH6A","pmids":["30185526"],"is_preprint":false},{"year":2019,"finding":"RSPH6A is phosphorylated at a novel site during sperm capacitation. The phosphorylation site resides in an exon unique to eutherian mammals. RSPH6A mRNA is restricted to spermatocytes, the protein localizes to the sperm flagellum, and solubility analyses show it is associated with cytoskeletal structures consistent with axonemal localization.","method":"Tandem mass spectrometry (MS/MS) phosphoproteomics of capacitated vs. uncapacitated mouse sperm, western blot, immunofluorescence, transcript analysis, cytoskeletal fractionation","journal":"Biology of reproduction","confidence":"High","confidence_rationale":"Tier 1-2 — MS/MS identification of phosphorylation site with multiple orthogonal validation methods","pmids":["30239614"],"is_preprint":false},{"year":1992,"finding":"RSP6 (Chlamydomonas ortholog of RSPH6A) encodes a 48.8 kDa proline-rich polypeptide that is 48% identical to RSP4; both genes are tightly linked and separated by only 435 bp. RSP6 mRNA accumulates during flagellar regeneration, consistent with a structural role in radial spoke head assembly.","method":"Gene sequencing, mRNA accumulation analysis during flagellar regeneration","journal":"Molecular and cellular biology","confidence":"Medium","confidence_rationale":"Tier 2 — original molecular characterization with functional context (flagellar regeneration), single lab","pmids":["1508197"],"is_preprint":false},{"year":2011,"finding":"RSP6 (Chlamydomonas ortholog of RSPH6A) interacts physically with RSP1, RSP4, and RSP9 to form a 7–10S spokehead complex. GST pulldown assays detected 10 pairwise interactions among spoke subunits in vitro, and chemical crosslinking of intact axonemes confirmed interactions in situ.","method":"GST pulldown with recombinant proteins, chemical crosslinking of axonemes, sucrose density gradient centrifugation","journal":"Cytoskeleton (Hoboken, N.J.)","confidence":"High","confidence_rationale":"Tier 1 — in vitro reconstitution of spoke head complex with multiple orthogonal methods (pulldown, crosslinking, sedimentation)","pmids":["21391306"],"is_preprint":false},{"year":2010,"finding":"RSP6 (Chlamydomonas ortholog of RSPH6A) is dispensable for flagellar motility in early log phase but is required for maintaining helical flagellar trajectory; RSP6-deficient mutants tend to spin rather than swim helically. Loss of RSP6 causes progressive loss of spoke head content during stationary phase, demonstrating that RSP6 is required for efficient assembly and maintenance of the axonemal spoke head complex.","method":"Chlamydomonas RSP6 mutant characterization, motility assays, electron microscopy, immunoblot of spokehead proteins across growth phases","journal":"Cytoskeleton (Hoboken, N.J.)","confidence":"Medium","confidence_rationale":"Tier 2 — defined cellular phenotype with structural and motility readouts in loss-of-function mutant","pmids":["20169531"],"is_preprint":false},{"year":2025,"finding":"RSPH6A is identified as a component of the head of Radial Spoke 1 (RS1) in human and mouse sperm flagella. Proteomic mass spectrometry following IQUB knockout showed that RS1 (but not RS2 or RS3) is deficient, and RSPH6A was identified among twelve critical RS1 components, placing RSPH6A specifically within the RS1 head structure.","method":"Protein mass spectrometry of Iqub-/- mouse sperm, western blotting, structural/bioinformatic modeling of RS1","journal":"Cell communication and signaling : CCS","confidence":"Medium","confidence_rationale":"Tier 2 — mass spectrometry-based placement within RS1 head, supported by KO model, single study","pmids":["39849482"],"is_preprint":false},{"year":2006,"finding":"Homologs of RSP4/6 (related to RSPH6A) in Tetrahymena cilia (p62 and p66) interact with Ca2+/calmodulin in a Ca2+-dependent manner, as demonstrated by Ca2+/CaM-affinity chromatography, suggesting a role for the RSP4/6-like spokehead proteins in Ca2+/CaM signaling that controls axonemal curvature and ciliary waveform.","method":"Ca2+/CaM-affinity column chromatography, cDNA sequencing, immunoelectron microscopy","journal":"Journal of biochemistry","confidence":"Medium","confidence_rationale":"Tier 2 — affinity purification demonstrating protein-protein interaction with functional context, single lab","pmids":["16936294"],"is_preprint":false},{"year":1998,"finding":"A sea urchin RSP4/6 homolog (p63, sharing homology with RSP6/RSPH6A) co-purifies and co-immunoprecipitates with 43 kDa and 34 kDa axonemal proteins as a native complex. Monoclonal antibody D-316 against p63 transforms flagellar beating from two-dimensional to three-dimensional, demonstrating that this spokehead protein is required for maintenance of planar flagellar beating.","method":"Immunoprecipitation, heat-extraction purification, gel filtration, monoclonal antibody perturbation of demembranated sperm models, cDNA cloning","journal":"Molecular biology of the cell","confidence":"Medium","confidence_rationale":"Tier 1-2 — functional antibody perturbation with biochemical complex isolation, but in sea urchin ortholog rather than mammalian RSPH6A directly","pmids":["9450971"],"is_preprint":false},{"year":2024,"finding":"RSPH6A mutations are identified as causative for male infertility (asthenozoospermia) in humans through exome sequencing of infertile males, with RSPH6A previously implicated only in mouse models, establishing its role in human male fertility.","method":"Whole-exome sequencing, segregation analysis in human patient cohort","journal":"Advanced genetics (Hoboken, N.J.)","confidence":"Low","confidence_rationale":"Tier 3 — human genetic evidence (exome sequencing) without direct mechanistic functional validation of the specific mutation","pmids":["38884051"],"is_preprint":false},{"year":2023,"finding":"RSPH6A protein expression in rat testis begins at postnatal day 21, coinciding with the appearance of primary spermatocytes, and increases through day 60. RSPH6A localizes to primary and secondary spermatocytes, spermatids, and mature sperm. Cadmium-induced oxidative stress impairs RSPH6A expression and localization in testis and epididymal spermatozoa, and melatonin co-treatment counteracts these effects.","method":"Western blot and immunofluorescence time-course during rat spermatogenesis, in vivo cadmium/melatonin treatment model","journal":"Reproductive medicine and biology","confidence":"Medium","confidence_rationale":"Tier 2 — direct localization experiment across developmental time points with functional context in defined cell types","pmids":["37795044"],"is_preprint":false}],"current_model":"RSPH6A is a conserved radial spoke head protein that localizes to the sperm flagellum axoneme, where it forms part of the RS1 head complex together with RSPH9 and other subunits; it is essential for sperm flagellar assembly and motility (loss causes short, immotile sperm and male infertility in mice), undergoes capacitation-induced phosphorylation at a eutherian-specific site in the flagellum, and its spokehead complex physically interacts with RSP1, RSP4, and RSP9 through direct protein-protein contacts that regulate dynein-driven flagellar beating patterns."},"narrative":{"teleology":[{"year":1992,"claim":"Molecular cloning of RSP6 in Chlamydomonas established that the radial spoke head contains a proline-rich polypeptide closely related to RSP4, and its mRNA upregulation during flagellar regeneration implied a structural role in spoke assembly.","evidence":"Gene sequencing and mRNA accumulation analysis during flagellar regeneration in Chlamydomonas","pmids":["1508197"],"confidence":"Medium","gaps":["No loss-of-function phenotype yet established","Protein–protein interactions within the spokehead not mapped","Mammalian ortholog not yet identified"]},{"year":1998,"claim":"Antibody perturbation of a sea urchin RSP4/6 homolog demonstrated that spokehead proteins actively control flagellar waveform dimensionality, converting beating from planar to three-dimensional when disrupted — the first functional evidence that the spoke head is not merely structural but a waveform regulator.","evidence":"Monoclonal antibody perturbation of demembranated sea urchin sperm, co-immunoprecipitation, and gel filtration of native complex","pmids":["9450971"],"confidence":"Medium","gaps":["Mechanism by which antibody binding alters waveform unclear","Experiments performed in sea urchin ortholog, not mammalian RSPH6A directly","Downstream signaling pathway not identified"]},{"year":2006,"claim":"Demonstration that Tetrahymena RSP4/6 homologs bind Ca²⁺/calmodulin in a calcium-dependent manner provided a candidate signaling mechanism through which the spoke head could transduce calcium signals to regulate ciliary waveform.","evidence":"Ca²⁺/CaM-affinity chromatography, immunoelectron microscopy in Tetrahymena cilia","pmids":["16936294"],"confidence":"Medium","gaps":["Direct Ca²⁺/CaM binding not shown for mammalian RSPH6A","Functional consequence of CaM interaction on motility not tested","Binding site on RSP6 not mapped"]},{"year":2010,"claim":"Chlamydomonas RSP6 mutant analysis resolved the paradox that RSP6 is dispensable for initial motility but required for helical swimming trajectory and long-term spoke head maintenance, revealing a role in assembly stability rather than core motility.","evidence":"Chlamydomonas RSP6 loss-of-function mutant with motility assays, EM, and immunoblot across growth phases","pmids":["20169531"],"confidence":"Medium","gaps":["Whether mammalian RSPH6A shares the partial dispensability phenotype unknown","Mechanism of progressive spoke head loss not defined","Structural basis for helical vs. spinning trajectory not resolved"]},{"year":2011,"claim":"In vitro reconstitution and in situ crosslinking mapped the direct protein–protein interaction network within the spoke head, showing RSP6 forms a 7–10S subcomplex with RSP1, RSP4, and RSP9 — defining the quaternary organization of the spoke head for the first time.","evidence":"GST pulldown with recombinant Chlamydomonas proteins, chemical crosslinking of axonemes, sucrose density gradient sedimentation","pmids":["21391306"],"confidence":"High","gaps":["Stoichiometry within the complex not determined","No high-resolution structure of the assembled spoke head","Whether mammalian spoke head has identical interaction topology not confirmed"]},{"year":2018,"claim":"The mouse knockout established that RSPH6A is absolutely essential for mammalian sperm flagellar assembly — unlike the partial Chlamydomonas phenotype — causing complete male infertility with short immotile sperm, disrupted axoneme elongation, and co-dependent loss of RSPH9.","evidence":"Rsph6a knockout mouse, immunofluorescence, electron microscopy of axoneme ultrastructure, western blot for RSPH9","pmids":["30185526"],"confidence":"High","gaps":["Mechanism by which RSPH6A loss leads to axoneme shortening not defined","Whether RSPH6A has functions beyond structural spoke assembly unknown","Female fertility and airway cilia not examined in KO"]},{"year":2019,"claim":"Phosphoproteomic discovery of a capacitation-induced phosphorylation site on a eutherian-specific RSPH6A exon linked spoke head regulation to sperm functional maturation signaling, suggesting an evolutionarily acquired regulatory layer.","evidence":"Tandem mass spectrometry of capacitated vs. uncapacitated mouse sperm, cytoskeletal fractionation, immunofluorescence","pmids":["30239614"],"confidence":"High","gaps":["Kinase responsible for RSPH6A phosphorylation not identified","Functional consequence of phosphorylation on motility not tested","Whether phosphorylation alters spoke head complex interactions unknown"]},{"year":2023,"claim":"Developmental expression profiling in rat testis showed RSPH6A appears coincident with primary spermatocytes and is sensitive to oxidative stress, placing its expression in the context of spermatogenic differentiation and environmental vulnerability.","evidence":"Western blot and immunofluorescence time-course during rat postnatal spermatogenesis, cadmium/melatonin in vivo model","pmids":["37795044"],"confidence":"Medium","gaps":["Direct mechanism of cadmium-induced RSPH6A loss unknown","Whether melatonin protection is RSPH6A-specific or a general antioxidant effect unclear","Functional consequence of reduced RSPH6A on rat sperm motility not directly measured"]},{"year":2024,"claim":"Human exome sequencing identified RSPH6A mutations as causative for asthenozoospermia, extending the gene's essential role in male fertility from mouse to human.","evidence":"Whole-exome sequencing and segregation analysis in infertile human males","pmids":["38884051"],"confidence":"Low","gaps":["Specific mutations lack direct functional validation (e.g. rescue or protein-level assay)","Number of families studied is limited","Mechanism by which identified variants disrupt protein function not characterized"]},{"year":2025,"claim":"Proteomic analysis following IQUB knockout placed RSPH6A specifically within the RS1 head (not RS2 or RS3), resolving which of the three mammalian radial spokes incorporates RSPH6A.","evidence":"Mass spectrometry of Iqub-/- mouse sperm, western blotting, structural modeling of RS1","pmids":["39849482"],"confidence":"Medium","gaps":["Placement based on loss in a single KO model; direct structural confirmation lacking","Whether RSPH6A is exclusive to RS1 or present at lower levels in other spokes not fully excluded","High-resolution cryo-EM structure of mammalian RS1 head not yet available"]},{"year":null,"claim":"The kinase(s) mediating capacitation-induced RSPH6A phosphorylation, the structural basis of spoke head complex assembly in mammals, and whether RSPH6A contributes to motile cilia function outside the male germline remain unresolved.","evidence":"","pmids":[],"confidence":"Low","gaps":["No high-resolution structure of mammalian RS1 head complex","Kinase for capacitation phosphorylation unidentified","Role in airway or ependymal cilia not examined"]}],"mechanism_profile":{"molecular_activity":[{"term_id":"GO:0005198","term_label":"structural molecule activity","supporting_discovery_ids":[0,2,3,4]}],"localization":[{"term_id":"GO:0005929","term_label":"cilium","supporting_discovery_ids":[0,1,5,7]},{"term_id":"GO:0005856","term_label":"cytoskeleton","supporting_discovery_ids":[0,1,3]}],"pathway":[{"term_id":"R-HSA-1474165","term_label":"Reproduction","supporting_discovery_ids":[0,1,8,9]}],"complexes":["RS1 head complex","Radial spoke head (7-10S subcomplex)"],"partners":["RSPH9","RSPH4A","RSPH1","IQUB"],"other_free_text":[]},"mechanistic_narrative":"RSPH6A is a radial spoke head protein essential for axonemal assembly, maintenance, and motility regulation in motile cilia and sperm flagella. It forms part of the RS1 head complex together with RSPH9, RSP1, and RSP4, where direct protein–protein interactions assemble a 7–10S spokehead subcomplex that controls dynein-driven flagellar beating patterns, including the maintenance of planar waveform [PMID:21391306, PMID:9450971, PMID:39849482]. In mice, Rsph6a knockout causes male infertility due to short, immotile spermatozoa with disrupted axoneme assembly and loss of RSPH9 from the flagellum, and RSPH6A undergoes capacitation-induced phosphorylation at a eutherian-specific site, linking it to functional sperm maturation [PMID:30185526, PMID:30239614]. Mutations in RSPH6A are identified as causative for human male infertility (asthenozoospermia) [PMID:38884051]."},"prefetch_data":{"uniprot":{"accession":"Q9H0K4","full_name":"Radial spoke head protein 6 homolog A","aliases":["Radial spoke head-like protein 1"],"length_aa":717,"mass_kda":80.9,"function":"Functions as part of radial spoke complexes in the axoneme of sperm flagella that play an important part in motility. The triple radial spokes (RS1, RS2 and RS3) are required to modulate beating of the sperm flagellum","subcellular_location":"Cytoplasm, cytoskeleton, flagellum axoneme","url":"https://www.uniprot.org/uniprotkb/Q9H0K4/entry"},"depmap":{"release":"DepMap","has_data":true,"is_common_essential":false,"resolved_as":"","url":"https://depmap.org/portal/gene/RSPH6A","classification":"Not Classified","n_dependent_lines":8,"n_total_lines":1208,"dependency_fraction":0.006622516556291391},"opencell":{"profiled":false,"resolved_as":"","ensg_id":"","cell_line_id":"","localizations":[],"interactors":[],"url":"https://opencell.sf.czbiohub.org/search/RSPH6A","total_profiled":1310},"omim":[{"mim_id":"610396","title":"TRAFFICKING PROTEIN PARTICLE COMPLEX, SUBUNIT 6A; TRAPPC6A","url":"https://www.omim.org/entry/610396"},{"mim_id":"607548","title":"RADIAL SPOKE HEAD 6 HOMOLOG A; RSPH6A","url":"https://www.omim.org/entry/607548"}],"hpa":{"profiled":true,"resolved_as":"","reliability":"","locations":[],"tissue_specificity":"Tissue enriched","tissue_distribution":"Detected in some","driving_tissues":[{"tissue":"testis","ntpm":28.3}],"url":"https://www.proteinatlas.org/search/RSPH6A"},"hgnc":{"alias_symbol":["RSP4","RSP6","RSPH4B"],"prev_symbol":["RSHL1"]},"alphafold":{"accession":"Q9H0K4","domains":[{"cath_id":"-","chopping":"305-374_412-505_517-559_587-648","consensus_level":"medium","plddt":92.2049,"start":305,"end":648},{"cath_id":"1.20.890","chopping":"196-208_216-249","consensus_level":"high","plddt":89.4921,"start":196,"end":249}],"viewer_url":"https://alphafold.ebi.ac.uk/entry/Q9H0K4","model_url":"https://alphafold.ebi.ac.uk/files/AF-Q9H0K4-F1-model_v6.cif","pae_url":"https://alphafold.ebi.ac.uk/files/AF-Q9H0K4-F1-predicted_aligned_error_v6.png","plddt_mean":68.5},"mouse_models":{"mgi_url":"https://www.informatics.jax.org/marker/summary?nomen=RSPH6A","jax_strain_url":"https://www.jax.org/strain/search?query=RSPH6A"},"sequence":{"accession":"Q9H0K4","fasta_url":"https://rest.uniprot.org/uniprotkb/Q9H0K4.fasta","uniprot_url":"https://www.uniprot.org/uniprotkb/Q9H0K4/entry","alphafold_viewer_url":"https://alphafold.ebi.ac.uk/entry/Q9H0K4"}},"corpus_meta":[{"pmid":"15924290","id":"PMC_15924290","title":"Proteomic 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Rsph6a knockout male mice are infertile due to short, immotile spermatozoa. The axoneme can elongate in KO testes but is disrupted before accessory structures form, manchette removal is impaired, and RSPH9 (another radial spoke protein) disappears from KO flagella, indicating RSPH6A is essential for sperm flagellar assembly.\",\n      \"method\": \"Knockout mouse model, immunofluorescence localization, electron microscopy of axoneme ultrastructure, western blot for RSPH9 co-dependence\",\n      \"journal\": \"Journal of cell science\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 — clean KO with defined cellular and structural phenotypes, multiple orthogonal methods, replicated dependency of RSPH9 on RSPH6A\",\n      \"pmids\": [\"30185526\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2019,\n      \"finding\": \"RSPH6A is phosphorylated at a novel site during sperm capacitation. The phosphorylation site resides in an exon unique to eutherian mammals. RSPH6A mRNA is restricted to spermatocytes, the protein localizes to the sperm flagellum, and solubility analyses show it is associated with cytoskeletal structures consistent with axonemal localization.\",\n      \"method\": \"Tandem mass spectrometry (MS/MS) phosphoproteomics of capacitated vs. uncapacitated mouse sperm, western blot, immunofluorescence, transcript analysis, cytoskeletal fractionation\",\n      \"journal\": \"Biology of reproduction\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1-2 — MS/MS identification of phosphorylation site with multiple orthogonal validation methods\",\n      \"pmids\": [\"30239614\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 1992,\n      \"finding\": \"RSP6 (Chlamydomonas ortholog of RSPH6A) encodes a 48.8 kDa proline-rich polypeptide that is 48% identical to RSP4; both genes are tightly linked and separated by only 435 bp. RSP6 mRNA accumulates during flagellar regeneration, consistent with a structural role in radial spoke head assembly.\",\n      \"method\": \"Gene sequencing, mRNA accumulation analysis during flagellar regeneration\",\n      \"journal\": \"Molecular and cellular biology\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 — original molecular characterization with functional context (flagellar regeneration), single lab\",\n      \"pmids\": [\"1508197\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2011,\n      \"finding\": \"RSP6 (Chlamydomonas ortholog of RSPH6A) interacts physically with RSP1, RSP4, and RSP9 to form a 7–10S spokehead complex. GST pulldown assays detected 10 pairwise interactions among spoke subunits in vitro, and chemical crosslinking of intact axonemes confirmed interactions in situ.\",\n      \"method\": \"GST pulldown with recombinant proteins, chemical crosslinking of axonemes, sucrose density gradient centrifugation\",\n      \"journal\": \"Cytoskeleton (Hoboken, N.J.)\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 — in vitro reconstitution of spoke head complex with multiple orthogonal methods (pulldown, crosslinking, sedimentation)\",\n      \"pmids\": [\"21391306\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2010,\n      \"finding\": \"RSP6 (Chlamydomonas ortholog of RSPH6A) is dispensable for flagellar motility in early log phase but is required for maintaining helical flagellar trajectory; RSP6-deficient mutants tend to spin rather than swim helically. Loss of RSP6 causes progressive loss of spoke head content during stationary phase, demonstrating that RSP6 is required for efficient assembly and maintenance of the axonemal spoke head complex.\",\n      \"method\": \"Chlamydomonas RSP6 mutant characterization, motility assays, electron microscopy, immunoblot of spokehead proteins across growth phases\",\n      \"journal\": \"Cytoskeleton (Hoboken, N.J.)\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 — defined cellular phenotype with structural and motility readouts in loss-of-function mutant\",\n      \"pmids\": [\"20169531\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2025,\n      \"finding\": \"RSPH6A is identified as a component of the head of Radial Spoke 1 (RS1) in human and mouse sperm flagella. Proteomic mass spectrometry following IQUB knockout showed that RS1 (but not RS2 or RS3) is deficient, and RSPH6A was identified among twelve critical RS1 components, placing RSPH6A specifically within the RS1 head structure.\",\n      \"method\": \"Protein mass spectrometry of Iqub-/- mouse sperm, western blotting, structural/bioinformatic modeling of RS1\",\n      \"journal\": \"Cell communication and signaling : CCS\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 — mass spectrometry-based placement within RS1 head, supported by KO model, single study\",\n      \"pmids\": [\"39849482\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2006,\n      \"finding\": \"Homologs of RSP4/6 (related to RSPH6A) in Tetrahymena cilia (p62 and p66) interact with Ca2+/calmodulin in a Ca2+-dependent manner, as demonstrated by Ca2+/CaM-affinity chromatography, suggesting a role for the RSP4/6-like spokehead proteins in Ca2+/CaM signaling that controls axonemal curvature and ciliary waveform.\",\n      \"method\": \"Ca2+/CaM-affinity column chromatography, cDNA sequencing, immunoelectron microscopy\",\n      \"journal\": \"Journal of biochemistry\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 — affinity purification demonstrating protein-protein interaction with functional context, single lab\",\n      \"pmids\": [\"16936294\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 1998,\n      \"finding\": \"A sea urchin RSP4/6 homolog (p63, sharing homology with RSP6/RSPH6A) co-purifies and co-immunoprecipitates with 43 kDa and 34 kDa axonemal proteins as a native complex. Monoclonal antibody D-316 against p63 transforms flagellar beating from two-dimensional to three-dimensional, demonstrating that this spokehead protein is required for maintenance of planar flagellar beating.\",\n      \"method\": \"Immunoprecipitation, heat-extraction purification, gel filtration, monoclonal antibody perturbation of demembranated sperm models, cDNA cloning\",\n      \"journal\": \"Molecular biology of the cell\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 1-2 — functional antibody perturbation with biochemical complex isolation, but in sea urchin ortholog rather than mammalian RSPH6A directly\",\n      \"pmids\": [\"9450971\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2024,\n      \"finding\": \"RSPH6A mutations are identified as causative for male infertility (asthenozoospermia) in humans through exome sequencing of infertile males, with RSPH6A previously implicated only in mouse models, establishing its role in human male fertility.\",\n      \"method\": \"Whole-exome sequencing, segregation analysis in human patient cohort\",\n      \"journal\": \"Advanced genetics (Hoboken, N.J.)\",\n      \"confidence\": \"Low\",\n      \"confidence_rationale\": \"Tier 3 — human genetic evidence (exome sequencing) without direct mechanistic functional validation of the specific mutation\",\n      \"pmids\": [\"38884051\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2023,\n      \"finding\": \"RSPH6A protein expression in rat testis begins at postnatal day 21, coinciding with the appearance of primary spermatocytes, and increases through day 60. RSPH6A localizes to primary and secondary spermatocytes, spermatids, and mature sperm. Cadmium-induced oxidative stress impairs RSPH6A expression and localization in testis and epididymal spermatozoa, and melatonin co-treatment counteracts these effects.\",\n      \"method\": \"Western blot and immunofluorescence time-course during rat spermatogenesis, in vivo cadmium/melatonin treatment model\",\n      \"journal\": \"Reproductive medicine and biology\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 — direct localization experiment across developmental time points with functional context in defined cell types\",\n      \"pmids\": [\"37795044\"],\n      \"is_preprint\": false\n    }\n  ],\n  \"current_model\": \"RSPH6A is a conserved radial spoke head protein that localizes to the sperm flagellum axoneme, where it forms part of the RS1 head complex together with RSPH9 and other subunits; it is essential for sperm flagellar assembly and motility (loss causes short, immotile sperm and male infertility in mice), undergoes capacitation-induced phosphorylation at a eutherian-specific site in the flagellum, and its spokehead complex physically interacts with RSP1, RSP4, and RSP9 through direct protein-protein contacts that regulate dynein-driven flagellar beating patterns.\"\n}\n```","stage2_raw":"```json\n{\n  \"mechanistic_narrative\": \"RSPH6A is a radial spoke head protein essential for axonemal assembly, maintenance, and motility regulation in motile cilia and sperm flagella. It forms part of the RS1 head complex together with RSPH9, RSP1, and RSP4, where direct protein–protein interactions assemble a 7–10S spokehead subcomplex that controls dynein-driven flagellar beating patterns, including the maintenance of planar waveform [PMID:21391306, PMID:9450971, PMID:39849482]. In mice, Rsph6a knockout causes male infertility due to short, immotile spermatozoa with disrupted axoneme assembly and loss of RSPH9 from the flagellum, and RSPH6A undergoes capacitation-induced phosphorylation at a eutherian-specific site, linking it to functional sperm maturation [PMID:30185526, PMID:30239614]. Mutations in RSPH6A are identified as causative for human male infertility (asthenozoospermia) [PMID:38884051].\",\n  \"teleology\": [\n    {\n      \"year\": 1992,\n      \"claim\": \"Molecular cloning of RSP6 in Chlamydomonas established that the radial spoke head contains a proline-rich polypeptide closely related to RSP4, and its mRNA upregulation during flagellar regeneration implied a structural role in spoke assembly.\",\n      \"evidence\": \"Gene sequencing and mRNA accumulation analysis during flagellar regeneration in Chlamydomonas\",\n      \"pmids\": [\"1508197\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"No loss-of-function phenotype yet established\", \"Protein–protein interactions within the spokehead not mapped\", \"Mammalian ortholog not yet identified\"]\n    },\n    {\n      \"year\": 1998,\n      \"claim\": \"Antibody perturbation of a sea urchin RSP4/6 homolog demonstrated that spokehead proteins actively control flagellar waveform dimensionality, converting beating from planar to three-dimensional when disrupted — the first functional evidence that the spoke head is not merely structural but a waveform regulator.\",\n      \"evidence\": \"Monoclonal antibody perturbation of demembranated sea urchin sperm, co-immunoprecipitation, and gel filtration of native complex\",\n      \"pmids\": [\"9450971\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Mechanism by which antibody binding alters waveform unclear\", \"Experiments performed in sea urchin ortholog, not mammalian RSPH6A directly\", \"Downstream signaling pathway not identified\"]\n    },\n    {\n      \"year\": 2006,\n      \"claim\": \"Demonstration that Tetrahymena RSP4/6 homologs bind Ca²⁺/calmodulin in a calcium-dependent manner provided a candidate signaling mechanism through which the spoke head could transduce calcium signals to regulate ciliary waveform.\",\n      \"evidence\": \"Ca²⁺/CaM-affinity chromatography, immunoelectron microscopy in Tetrahymena cilia\",\n      \"pmids\": [\"16936294\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Direct Ca²⁺/CaM binding not shown for mammalian RSPH6A\", \"Functional consequence of CaM interaction on motility not tested\", \"Binding site on RSP6 not mapped\"]\n    },\n    {\n      \"year\": 2010,\n      \"claim\": \"Chlamydomonas RSP6 mutant analysis resolved the paradox that RSP6 is dispensable for initial motility but required for helical swimming trajectory and long-term spoke head maintenance, revealing a role in assembly stability rather than core motility.\",\n      \"evidence\": \"Chlamydomonas RSP6 loss-of-function mutant with motility assays, EM, and immunoblot across growth phases\",\n      \"pmids\": [\"20169531\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Whether mammalian RSPH6A shares the partial dispensability phenotype unknown\", \"Mechanism of progressive spoke head loss not defined\", \"Structural basis for helical vs. spinning trajectory not resolved\"]\n    },\n    {\n      \"year\": 2011,\n      \"claim\": \"In vitro reconstitution and in situ crosslinking mapped the direct protein–protein interaction network within the spoke head, showing RSP6 forms a 7–10S subcomplex with RSP1, RSP4, and RSP9 — defining the quaternary organization of the spoke head for the first time.\",\n      \"evidence\": \"GST pulldown with recombinant Chlamydomonas proteins, chemical crosslinking of axonemes, sucrose density gradient sedimentation\",\n      \"pmids\": [\"21391306\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Stoichiometry within the complex not determined\", \"No high-resolution structure of the assembled spoke head\", \"Whether mammalian spoke head has identical interaction topology not confirmed\"]\n    },\n    {\n      \"year\": 2018,\n      \"claim\": \"The mouse knockout established that RSPH6A is absolutely essential for mammalian sperm flagellar assembly — unlike the partial Chlamydomonas phenotype — causing complete male infertility with short immotile sperm, disrupted axoneme elongation, and co-dependent loss of RSPH9.\",\n      \"evidence\": \"Rsph6a knockout mouse, immunofluorescence, electron microscopy of axoneme ultrastructure, western blot for RSPH9\",\n      \"pmids\": [\"30185526\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Mechanism by which RSPH6A loss leads to axoneme shortening not defined\", \"Whether RSPH6A has functions beyond structural spoke assembly unknown\", \"Female fertility and airway cilia not examined in KO\"]\n    },\n    {\n      \"year\": 2019,\n      \"claim\": \"Phosphoproteomic discovery of a capacitation-induced phosphorylation site on a eutherian-specific RSPH6A exon linked spoke head regulation to sperm functional maturation signaling, suggesting an evolutionarily acquired regulatory layer.\",\n      \"evidence\": \"Tandem mass spectrometry of capacitated vs. uncapacitated mouse sperm, cytoskeletal fractionation, immunofluorescence\",\n      \"pmids\": [\"30239614\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Kinase responsible for RSPH6A phosphorylation not identified\", \"Functional consequence of phosphorylation on motility not tested\", \"Whether phosphorylation alters spoke head complex interactions unknown\"]\n    },\n    {\n      \"year\": 2023,\n      \"claim\": \"Developmental expression profiling in rat testis showed RSPH6A appears coincident with primary spermatocytes and is sensitive to oxidative stress, placing its expression in the context of spermatogenic differentiation and environmental vulnerability.\",\n      \"evidence\": \"Western blot and immunofluorescence time-course during rat postnatal spermatogenesis, cadmium/melatonin in vivo model\",\n      \"pmids\": [\"37795044\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Direct mechanism of cadmium-induced RSPH6A loss unknown\", \"Whether melatonin protection is RSPH6A-specific or a general antioxidant effect unclear\", \"Functional consequence of reduced RSPH6A on rat sperm motility not directly measured\"]\n    },\n    {\n      \"year\": 2024,\n      \"claim\": \"Human exome sequencing identified RSPH6A mutations as causative for asthenozoospermia, extending the gene's essential role in male fertility from mouse to human.\",\n      \"evidence\": \"Whole-exome sequencing and segregation analysis in infertile human males\",\n      \"pmids\": [\"38884051\"],\n      \"confidence\": \"Low\",\n      \"gaps\": [\"Specific mutations lack direct functional validation (e.g. rescue or protein-level assay)\", \"Number of families studied is limited\", \"Mechanism by which identified variants disrupt protein function not characterized\"]\n    },\n    {\n      \"year\": 2025,\n      \"claim\": \"Proteomic analysis following IQUB knockout placed RSPH6A specifically within the RS1 head (not RS2 or RS3), resolving which of the three mammalian radial spokes incorporates RSPH6A.\",\n      \"evidence\": \"Mass spectrometry of Iqub-/- mouse sperm, western blotting, structural modeling of RS1\",\n      \"pmids\": [\"39849482\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Placement based on loss in a single KO model; direct structural confirmation lacking\", \"Whether RSPH6A is exclusive to RS1 or present at lower levels in other spokes not fully excluded\", \"High-resolution cryo-EM structure of mammalian RS1 head not yet available\"]\n    },\n    {\n      \"year\": null,\n      \"claim\": \"The kinase(s) mediating capacitation-induced RSPH6A phosphorylation, the structural basis of spoke head complex assembly in mammals, and whether RSPH6A contributes to motile cilia function outside the male germline remain unresolved.\",\n      \"evidence\": \"\",\n      \"pmids\": [],\n      \"confidence\": \"Low\",\n      \"gaps\": [\"No high-resolution structure of mammalian RS1 head complex\", \"Kinase for capacitation phosphorylation unidentified\", \"Role in airway or ependymal cilia not examined\"]\n    }\n  ],\n  \"mechanism_profile\": {\n    \"molecular_activity\": [\n      {\"term_id\": \"GO:0005198\", \"supporting_discovery_ids\": [0, 2, 3, 4]}\n    ],\n    \"localization\": [\n      {\"term_id\": \"GO:0005929\", \"supporting_discovery_ids\": [0, 1, 5, 7]},\n      {\"term_id\": \"GO:0005856\", \"supporting_discovery_ids\": [0, 1, 3]}\n    ],\n    \"pathway\": [\n      {\"term_id\": \"R-HSA-1474165\", \"supporting_discovery_ids\": [0, 1, 8, 9]}\n    ],\n    \"complexes\": [\"RS1 head complex\", \"Radial spoke head (7-10S subcomplex)\"],\n    \"partners\": [\"RSPH9\", \"RSPH4A\", \"RSPH1\", \"IQUB\"],\n    \"other_free_text\": []\n  }\n}\n```"}