{"gene":"RSPH9","run_date":"2026-06-10T07:46:28","timeline":{"discoveries":[{"year":2009,"finding":"RSPH9 encodes a protein component of the axonemal radial spoke head; loss-of-function mutations cause primary ciliary dyskinesia with central-microtubular-pair abnormalities; knockdown of RSPH9 orthologs in zebrafish and Chlamydomonas disrupts normal motile cilia beat pattern, which is rescued by reintroduction of gene expression","method":"SNP-based linkage analysis, positional cloning, in situ hybridization (murine Rsph9), morpholino knockdown in zebrafish, rescue experiment in zebrafish","journal":"American journal of human genetics","confidence":"High","confidence_rationale":"Tier 2 / Strong — genetic identification plus functional knockdown with rescue in two independent model organisms (zebrafish and Chlamydomonas)","pmids":["19200523"],"is_preprint":false},{"year":2015,"finding":"RSPH4A is the core protein of the radial spoke head; RSPH4A mutations result in deficient axonemal assembly of both RSPH1 and RSPH9; RSPH1 mutations cause loss of RSPH9 from cilia; RSPH9 mutations cause axonemal absence of RSPH9 but do not affect assembly of RSPH1 or RSPH4A, establishing an assembly hierarchy: RSPH4A > RSPH1 > RSPH9","method":"High-resolution immunofluorescence analysis of human respiratory cilia from patients with biallelic mutations in RSPH9, RSPH4A, and RSPH1","journal":"American journal of respiratory cell and molecular biology","confidence":"High","confidence_rationale":"Tier 2 / Strong — immunofluorescence with multiple patient genotypes and orthogonal genetic backgrounds, replicated across 21 individuals from 16 families","pmids":["25789548"],"is_preprint":false},{"year":2014,"finding":"Loss-of-function mutations in RSPH1 cause loss of RSPH4A and RSPH9 from cilia, suggesting RSPH1 mutations result in loss of the entire radial spoke head structure; RSPH9 is therefore dependent on RSPH1 for its axonemal assembly","method":"Targeted NGS panel sequencing, high-resolution immunofluorescence of human respiratory cilia, ultrastructural analysis by TEM","journal":"Human molecular genetics","confidence":"High","confidence_rationale":"Tier 2 / Strong — reciprocal immunofluorescence in patient cilia with defined mutations, consistent with findings in paper 25789548","pmids":["24518672"],"is_preprint":false},{"year":2018,"finding":"Mouse Rsph9 is specifically expressed in tissues containing motile cilia and is upregulated during multiciliation; Rsph9 localizes to the ciliary axoneme consistent with its role as a radial spoke subunit; RNAi-mediated depletion of Rsph9 in mouse ependymal cilia causes near-complete central pair loss, converts ciliary beat pattern from planar to rotational, and markedly downregulates multiple radial spoke proteins including other head components","method":"RNAi knockdown in mouse ependymal cells, immunofluorescence localization, high-speed video microscopy, TEM","journal":"Biology of the cell","confidence":"High","confidence_rationale":"Tier 2 / Moderate — loss-of-function with multiple orthogonal readouts (beat pattern, CP ultrastructure, RS protein levels) in a single focused study","pmids":["30383886"],"is_preprint":false},{"year":2016,"finding":"Zebrafish Rsph9 localizes to both 9+2 and 9+0 ciliary axonemes; CRISPR-mediated rsph9 mutation disrupts motility of presumptive 9+2 olfactory cilia and 9+0 neural cilia, and impairs structural integrity of both axoneme types; rsph9 mutant larvae show reduced acoustic startle response consistent with hearing impairment, revealing a role in kinocilia of the inner ear","method":"CRISPR mutagenesis in zebrafish, immunofluorescence localization, behavioral assays (acoustic startle response), structural analysis","journal":"Scientific reports","confidence":"High","confidence_rationale":"Tier 2 / Moderate — CRISPR loss-of-function with multiple phenotypic readouts (motility, structure, behavior) in a single rigorous study","pmids":["27687975"],"is_preprint":false},{"year":2020,"finding":"Deletion of Rsph9 in mice leads to neonatal hydrocephalus; Rsph9-/- ependymal cilia show lower beating amplitude and irregular rotational beating pattern; centriolar patch size is increased in Rsph9-/- cells; TEM reveals ectopic ciliary membrane inclusions in Rsph9-/- cilia without gross axonemal organizational defects; hydrocephalus results in astrogliosis, microgliosis, and cerebrovascular abnormalities","method":"Rsph9 knockout mouse model, high-speed video microscopy, TEM, immunofluorescence","journal":"Scientific reports","confidence":"High","confidence_rationale":"Tier 2 / Moderate — germline KO mouse with multiple orthogonal methods (video microscopy, TEM, histology) establishing ciliary structural and motility defects","pmids":["32709945"],"is_preprint":false},{"year":2018,"finding":"RSPH9 protein disappears from sperm flagella in Rsph6a knockout mice, indicating that RSPH6A is required upstream of RSPH9 for radial spoke assembly in sperm flagella","method":"Rsph6a knockout mouse model, immunofluorescence of sperm flagella","journal":"Journal of cell science","confidence":"Medium","confidence_rationale":"Tier 2 / Weak — single genetic KO model with immunofluorescence, single lab, single method for the RSPH9-specific finding","pmids":["30185526"],"is_preprint":false},{"year":2022,"finding":"SPEF2 interacts with RSPH9 in vitro, suggesting SPEF2 and RSPH9 functionally cooperate during sperm flagellar assembly","method":"Co-immunoprecipitation in vitro (proteomic analysis of SPEF2 mutant patient spermatozoa plus in vitro interaction assay)","journal":"Asian journal of andrology","confidence":"Medium","confidence_rationale":"Tier 3 / Weak — single in vitro interaction assay, single lab, no mutagenesis confirmation","pmids":["34755699"],"is_preprint":false},{"year":2023,"finding":"Purified recombinant LRRC23 directly interacts with RSPH9 (an RS head protein), and this interaction is abolished by C-terminal truncation of LRRC23; cryo-electron tomography shows absence of the RS3 head in LRRC23 mutant spermatozoa, placing RSPH9 as a component of the RS3 head and demonstrating that LRRC23 is required for RS3 head assembly via its interaction with RSPH9","method":"Recombinant protein interaction assay (purified proteins), C-terminal truncation mutagenesis, cryo-electron tomography of mutant spermatozoa","journal":"eLife","confidence":"High","confidence_rationale":"Tier 1 / Moderate — in vitro reconstitution with mutagenesis plus structural validation by cryo-ET, single lab but multiple orthogonal methods","pmids":["38091523"],"is_preprint":false},{"year":2023,"finding":"LRRC23 interacts with RSPH9 (RS head protein) in vitro, and C-terminal truncation abolishes this interaction; cryo-ET confirms RS3 head loss in LRRC23 mutant sperm (preprint version of the eLife paper above)","method":"Recombinant protein interaction assay, mutagenesis, cryo-electron tomography","journal":"bioRxiv","confidence":"Medium","confidence_rationale":"Tier 1 / Weak — preprint with same data as peer-reviewed eLife paper; confidence deferred to peer-reviewed version","pmids":["36865175"],"is_preprint":true},{"year":2023,"finding":"Pathogenic variants in RSPH9 cause male infertility due to sperm cell dysmotility and abnormal flagellar RSPH9 protein composition, demonstrated for the first time by immunofluorescence microscopy in sperm cells from an RSPH9-mutant individual","method":"Next-generation sequencing, immunofluorescence microscopy of sperm flagella, high-speed video microscopy, transmission electron microscopy, semen analysis","journal":"Frontiers in genetics","confidence":"Medium","confidence_rationale":"Tier 2 / Weak — multiple diagnostic methods in a single patient, single lab; first demonstration of RSPH9 deficiency in sperm flagella causing dysmotility","pmids":["36873931"],"is_preprint":false},{"year":2025,"finding":"RSPH9 is identified as a component of radial spoke 1 (RS1) head in human and mouse sperm flagella; RSPH9, along with RSPH3, RSPH6A, and DYDC1, constitutes the RS1 head; DNAH12 interacts with radial spoke head proteins RSPH1, RSPH9, and DNAJB13 to regulate central pair stability in sperm flagella","method":"Protein mass spectrometry, western blotting, co-immunoprecipitation, Iqub-/- mouse model, bioinformatic structural modeling","journal":"Cell communication and signaling : CCS","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — mass spectrometry identification plus Co-IP interaction with DNAH12 and structural assignment via multiple methods, single lab","pmids":["39849482"],"is_preprint":false},{"year":2024,"finding":"DNAH12 interacts with radial spoke head proteins RSPH1, RSPH9, and DNAJB13; disruption of DNAH12 compromises central pair stability; this interaction positions RSPH9 functionally near the inner dynein arm/central pair regulatory axis in sperm flagella","method":"Co-immunoprecipitation, mouse knockout model (Dnah12-/-), TEM, immunofluorescence","journal":"bioRxiv","confidence":"Medium","confidence_rationale":"Tier 2 / Weak — Co-IP plus KO model in a preprint; single lab, interaction confirmed by pulldown","pmids":[],"is_preprint":true},{"year":2017,"finding":"RSPH9 is a high-abundance component of human airway ciliary axonemes, quantified at 1850 fmol by label-free LC/MSE, establishing it as one of the most abundant non-tubulin axonemal proteins","method":"Label-free quantitative LC/MSE proteomics of human airway cilia axonemes","journal":"Journal of proteome research","confidence":"Medium","confidence_rationale":"Tier 2 / Weak — quantitative proteomic localization to ciliary axoneme, single lab, no functional validation of abundance","pmids":["28282151"],"is_preprint":false}],"current_model":"RSPH9 is a component of the radial spoke head in axonemal '9+2' motile cilia and sperm flagella, where it is required for radial spoke head assembly and central pair microtubule stability; its axonemal localization depends on upstream assembly factors RSPH4A and RSPH1 (establishing a RSPH4A > RSPH1 > RSPH9 hierarchy), it constitutes the RS1 head along with RSPH3, RSPH6A, and DYDC1, and it physically interacts with LRRC23 (an RS3 head assembly factor), SPEF2, and DNAH12; loss of RSPH9 converts ciliary beat from planar to rotational, causes central pair loss, and leads to hydrocephalus in mice and primary ciliary dyskinesia with sperm dysmotility and male infertility in humans."},"narrative":{"mechanistic_narrative":"RSPH9 is a core structural component of the radial spoke head of axonemal '9+2' motile cilia and sperm flagella, where it is required for radial spoke head assembly, central pair microtubule stability, and the normal planar ciliary beat [PMID:19200523, PMID:30383886]. Its incorporation into the axoneme is governed by an ordered assembly hierarchy in respiratory cilia, RSPH4A > RSPH1 > RSPH9, such that loss of either upstream factor strips RSPH9 from cilia while RSPH9 loss leaves RSPH4A and RSPH1 assembly intact [PMID:25789548, PMID:24518672]; in sperm flagella RSPH6A acts upstream of RSPH9 [PMID:30185526]. Within the spoke architecture RSPH9 constitutes the RS1 head together with RSPH3, RSPH6A, and DYDC1, and also localizes to the RS3 head where its direct interaction with LRRC23 is required for RS3 head assembly [PMID:38091523, PMID:39849482]; it further engages SPEF2 and the dynein DNAH12, the latter coupling the radial spoke head to central pair stability [PMID:34755699, PMID:39849482]. Loss of RSPH9 causes near-complete central pair loss and converts the ciliary beat from planar to rotational, producing neonatal hydrocephalus in mice and, in humans, primary ciliary dyskinesia with sperm dysmotility and male infertility [PMID:30383886, PMID:32709945, PMID:36873931].","teleology":[{"year":2009,"claim":"Established RSPH9 as a disease gene and assigned it to the radial spoke head, answering whether this gene is causally required for normal motile cilia function.","evidence":"Positional cloning of PCD families plus morpholino knockdown with rescue in zebrafish and Chlamydomonas","pmids":["19200523"],"confidence":"High","gaps":["Did not resolve the molecular activity of RSPH9 within the spoke head","No structural placement within the radial spoke"]},{"year":2014,"claim":"Showed RSPH9 axonemal assembly depends on RSPH1, indicating RSPH9 is part of an interdependent spoke head module rather than independently anchored.","evidence":"Patient cilia immunofluorescence and TEM with defined RSPH1 mutations","pmids":["24518672"],"confidence":"High","gaps":["Did not define the full ordering relative to RSPH4A","Mechanism of recruitment not resolved"]},{"year":2015,"claim":"Resolved the assembly hierarchy RSPH4A > RSPH1 > RSPH9, establishing RSPH9 as a terminal/dependent member whose loss does not destabilize upstream components.","evidence":"High-resolution immunofluorescence across multiple patient genotypes in respiratory cilia","pmids":["25789548"],"confidence":"High","gaps":["Hierarchy defined for respiratory cilia, not sperm flagella","Does not show direct physical contacts between hierarchy members"]},{"year":2016,"claim":"Extended RSPH9 function beyond canonical 9+2 cilia by showing it localizes to and is required for both 9+2 and 9+0 axonemes and sensory kinocilia.","evidence":"CRISPR mutagenesis, localization, and behavioral/structural assays in zebrafish","pmids":["27687975"],"confidence":"High","gaps":["Mechanism of RSPH9 function in 9+0 cilia lacking a central pair unexplained","Mammalian relevance of kinocilia role not tested"]},{"year":2018,"claim":"Linked RSPH9 depletion mechanistically to central pair loss and beat-pattern conversion, and showed it stabilizes a network of radial spoke proteins.","evidence":"RNAi knockdown in mouse ependymal cells with high-speed video, TEM, and RS protein quantification","pmids":["30383886"],"confidence":"High","gaps":["Does not establish which interactions are direct","Causal order between central pair loss and beat change unresolved"]},{"year":2018,"claim":"Placed RSPH6A upstream of RSPH9 in sperm flagellar spoke assembly, indicating tissue-specific upstream dependencies.","evidence":"Rsph6a knockout mouse with sperm flagella immunofluorescence","pmids":["30185526"],"confidence":"Medium","gaps":["Single KO model with single readout for the RSPH9-specific finding","Direct interaction not tested"]},{"year":2022,"claim":"Identified SPEF2 as a physical partner of RSPH9, suggesting cooperation during flagellar assembly.","evidence":"In vitro co-immunoprecipitation alongside SPEF2-mutant patient sperm proteomics","pmids":["34755699"],"confidence":"Medium","gaps":["Single in vitro interaction without mutagenesis confirmation","Functional consequence of the interaction not established"]},{"year":2023,"claim":"Provided the first direct biochemical and structural placement of RSPH9 in the RS3 head via its LRRC23 interaction, defining a specific binding interface required for RS3 head assembly.","evidence":"Purified recombinant protein interaction with C-terminal truncation mutagenesis and cryo-ET of mutant spermatozoa","pmids":["38091523","36865175"],"confidence":"High","gaps":["Mapped LRRC23 interface but not the RSPH9 residues involved","RS3 vs RS1 head dual assignment not fully reconciled"]},{"year":2023,"claim":"Demonstrated RSPH9 deficiency in human sperm flagella causing dysmotility, extending the PCD phenotype to male infertility with altered flagellar RSPH9 composition.","evidence":"NGS, immunofluorescence, high-speed video, and TEM of sperm from an RSPH9-mutant individual","pmids":["36873931"],"confidence":"Medium","gaps":["Single patient","Does not dissect molecular basis of flagellar dysmotility"]},{"year":2025,"claim":"Assigned RSPH9 to the RS1 head with RSPH3, RSPH6A, and DYDC1, and linked it to central pair stability through DNAH12, integrating the spoke head with a dynein/central pair regulatory axis.","evidence":"Mass spectrometry, Co-IP, structural modeling, and Iqub/Dnah12 mouse models","pmids":["39849482"],"confidence":"Medium","gaps":["Direct vs indirect nature of DNAH12 interaction unclear","Reconciliation of RS1 and RS3 head assignments incomplete"]},{"year":null,"claim":"The molecular activity of RSPH9 within the spoke head — its precise structural role and how it couples spoke head integrity to central pair maintenance — remains undefined.","evidence":"","pmids":[],"confidence":"Medium","gaps":["No enzymatic or biochemical activity assigned","Mechanism linking spoke head loss to central pair collapse not resolved","Full set of direct binding partners and stoichiometry within the radial spoke unknown"]}],"mechanism_profile":{"molecular_activity":[{"term_id":"GO:0005198","term_label":"structural molecule activity","supporting_discovery_ids":[0,3,8,11,13]}],"localization":[{"term_id":"GO:0005929","term_label":"cilium","supporting_discovery_ids":[0,3,4,13]},{"term_id":"GO:0005856","term_label":"cytoskeleton","supporting_discovery_ids":[3,4,13]}],"pathway":[],"complexes":["radial spoke head (RS1 head)","radial spoke head (RS3 head)"],"partners":["LRRC23","SPEF2","DNAH12","RSPH1","RSPH3","RSPH6A","DYDC1","DNAJB13"],"other_free_text":[]}},"prefetch_data":{"uniprot":{"accession":"Q9H1X1","full_name":"Radial spoke head protein 9 homolog","aliases":[],"length_aa":276,"mass_kda":31.3,"function":"Functions as part of axonemal radial spoke complexes that play an important part in the motility of sperm and cilia (PubMed:19200523). Essential for both the radial spoke head assembly and the central pair microtubule stability in ependymal motile cilia (By similarity). Required for motility of olfactory and neural cilia and for the structural integrity of ciliary axonemes in both 9+0 and 9+2 motile cilia (By similarity)","subcellular_location":"Cytoplasm, cytoskeleton, cilium axoneme; Cytoplasm, cytoskeleton, flagellum axoneme; Cell projection, kinocilium","url":"https://www.uniprot.org/uniprotkb/Q9H1X1/entry"},"depmap":{"release":"DepMap","has_data":true,"is_common_essential":false,"resolved_as":"","url":"https://depmap.org/portal/gene/RSPH9","classification":"Not Classified","n_dependent_lines":76,"n_total_lines":1208,"dependency_fraction":0.06291390728476821},"opencell":{"profiled":false,"resolved_as":"","ensg_id":"","cell_line_id":"","localizations":[],"interactors":[],"url":"https://opencell.sf.czbiohub.org/search/RSPH9","total_profiled":1310},"omim":[{"mim_id":"620848","title":"SPERMATOGENIC FAILURE 92; SPGF92","url":"https://www.omim.org/entry/620848"},{"mim_id":"620708","title":"LEUCINE-RICH REPEAT-CONTAINING PROTEIN 23; LRRC23","url":"https://www.omim.org/entry/620708"},{"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"},{"mim_id":"612650","title":"CILIARY DYSKINESIA, PRIMARY, 12; CILD12","url":"https://www.omim.org/entry/612650"}],"hpa":{"profiled":true,"resolved_as":"","reliability":"Approved","locations":[{"location":"Mid piece","reliability":"Approved"},{"location":"Principal piece","reliability":"Approved"},{"location":"End piece","reliability":"Approved"},{"location":"Acrosome","reliability":"Additional"},{"location":"Equatorial segment","reliability":"Additional"}],"tissue_specificity":"Tissue enhanced","tissue_distribution":"Detected in some","driving_tissues":[{"tissue":"choroid plexus","ntpm":8.1},{"tissue":"fallopian tube","ntpm":7.8},{"tissue":"testis","ntpm":14.5}],"url":"https://www.proteinatlas.org/search/RSPH9"},"hgnc":{"alias_symbol":["FLJ30845","CILD12"],"prev_symbol":["MRPS18AL1","C6orf206"]},"alphafold":{"accession":"Q9H1X1","domains":[{"cath_id":"-","chopping":"4-275","consensus_level":"medium","plddt":91.5623,"start":4,"end":275}],"viewer_url":"https://alphafold.ebi.ac.uk/entry/Q9H1X1","model_url":"https://alphafold.ebi.ac.uk/files/AF-Q9H1X1-F1-model_v6.cif","pae_url":"https://alphafold.ebi.ac.uk/files/AF-Q9H1X1-F1-predicted_aligned_error_v6.png","plddt_mean":91.88},"mouse_models":{"mgi_url":"https://www.informatics.jax.org/marker/summary?nomen=RSPH9","jax_strain_url":"https://www.jax.org/strain/search?query=RSPH9"},"sequence":{"accession":"Q9H1X1","fasta_url":"https://rest.uniprot.org/uniprotkb/Q9H1X1.fasta","uniprot_url":"https://www.uniprot.org/uniprotkb/Q9H1X1/entry","alphafold_viewer_url":"https://alphafold.ebi.ac.uk/entry/Q9H1X1"}},"corpus_meta":[{"pmid":"19200523","id":"PMC_19200523","title":"Mutations 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Distribution of Known and Novel Genetic Variants in Children With Primary Ciliary Dyskinesia in the State of Qatar.","date":"2025","source":"Clinical genetics","url":"https://pubmed.ncbi.nlm.nih.gov/41267578","citation_count":0,"is_preprint":false},{"pmid":null,"id":"bio_10.1101_2024.06.20.599934","title":"Deficiency in DNAH12 causes male infertility by impairing DNAH1 and DNALI1 recruitment in humans and 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":22143,"output_tokens":3419,"usd":0.058857,"stage1_stop_reason":"end_turn"},"stage2":{"model":"claude-opus-4-8","input_tokens":10932,"output_tokens":2991,"usd":0.064717,"stage2_stop_reason":"end_turn"},"total_usd":0.123574,"stage1_batch_id":"msgbatch_013LWZZT6MWaqB9qyTSeQBmU","stage2_batch_id":"msgbatch_0194ZzQaTGNpruoNJBbEMbt3","note":"batch pricing = 50% of standard"},"stage1_raw":"```json\n{\n  \"discoveries\": [\n    {\n      \"year\": 2009,\n      \"finding\": \"RSPH9 encodes a protein component of the axonemal radial spoke head; loss-of-function mutations cause primary ciliary dyskinesia with central-microtubular-pair abnormalities; knockdown of RSPH9 orthologs in zebrafish and Chlamydomonas disrupts normal motile cilia beat pattern, which is rescued by reintroduction of gene expression\",\n      \"method\": \"SNP-based linkage analysis, positional cloning, in situ hybridization (murine Rsph9), morpholino knockdown in zebrafish, rescue experiment in zebrafish\",\n      \"journal\": \"American journal of human genetics\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — genetic identification plus functional knockdown with rescue in two independent model organisms (zebrafish and Chlamydomonas)\",\n      \"pmids\": [\"19200523\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2015,\n      \"finding\": \"RSPH4A is the core protein of the radial spoke head; RSPH4A mutations result in deficient axonemal assembly of both RSPH1 and RSPH9; RSPH1 mutations cause loss of RSPH9 from cilia; RSPH9 mutations cause axonemal absence of RSPH9 but do not affect assembly of RSPH1 or RSPH4A, establishing an assembly hierarchy: RSPH4A > RSPH1 > RSPH9\",\n      \"method\": \"High-resolution immunofluorescence analysis of human respiratory cilia from patients 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 — immunofluorescence with multiple patient genotypes and orthogonal genetic backgrounds, replicated across 21 individuals from 16 families\",\n      \"pmids\": [\"25789548\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2014,\n      \"finding\": \"Loss-of-function mutations in RSPH1 cause loss of RSPH4A and RSPH9 from cilia, suggesting RSPH1 mutations result in loss of the entire radial spoke head structure; RSPH9 is therefore dependent on RSPH1 for its axonemal assembly\",\n      \"method\": \"Targeted NGS panel sequencing, high-resolution immunofluorescence of human respiratory cilia, ultrastructural analysis by TEM\",\n      \"journal\": \"Human molecular genetics\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — reciprocal immunofluorescence in patient cilia with defined mutations, consistent with findings in paper 25789548\",\n      \"pmids\": [\"24518672\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2018,\n      \"finding\": \"Mouse Rsph9 is specifically expressed in tissues containing motile cilia and is upregulated during multiciliation; Rsph9 localizes to the ciliary axoneme consistent with its role as a radial spoke subunit; RNAi-mediated depletion of Rsph9 in mouse ependymal cilia causes near-complete central pair loss, converts ciliary beat pattern from planar to rotational, and markedly downregulates multiple radial spoke proteins including other head components\",\n      \"method\": \"RNAi knockdown in mouse ependymal cells, immunofluorescence localization, high-speed video microscopy, TEM\",\n      \"journal\": \"Biology of the cell\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — loss-of-function with multiple orthogonal readouts (beat pattern, CP ultrastructure, RS protein levels) in a single focused study\",\n      \"pmids\": [\"30383886\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2016,\n      \"finding\": \"Zebrafish Rsph9 localizes to both 9+2 and 9+0 ciliary axonemes; CRISPR-mediated rsph9 mutation disrupts motility of presumptive 9+2 olfactory cilia and 9+0 neural cilia, and impairs structural integrity of both axoneme types; rsph9 mutant larvae show reduced acoustic startle response consistent with hearing impairment, revealing a role in kinocilia of the inner ear\",\n      \"method\": \"CRISPR mutagenesis in zebrafish, immunofluorescence localization, behavioral assays (acoustic startle response), structural analysis\",\n      \"journal\": \"Scientific reports\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — CRISPR loss-of-function with multiple phenotypic readouts (motility, structure, behavior) in a single rigorous study\",\n      \"pmids\": [\"27687975\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2020,\n      \"finding\": \"Deletion of Rsph9 in mice leads to neonatal hydrocephalus; Rsph9-/- ependymal cilia show lower beating amplitude and irregular rotational beating pattern; centriolar patch size is increased in Rsph9-/- cells; TEM reveals ectopic ciliary membrane inclusions in Rsph9-/- cilia without gross axonemal organizational defects; hydrocephalus results in astrogliosis, microgliosis, and cerebrovascular abnormalities\",\n      \"method\": \"Rsph9 knockout mouse model, high-speed video microscopy, TEM, immunofluorescence\",\n      \"journal\": \"Scientific reports\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — germline KO mouse with multiple orthogonal methods (video microscopy, TEM, histology) establishing ciliary structural and motility defects\",\n      \"pmids\": [\"32709945\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2018,\n      \"finding\": \"RSPH9 protein disappears from sperm flagella in Rsph6a knockout mice, indicating that RSPH6A is required upstream of RSPH9 for radial spoke assembly in sperm flagella\",\n      \"method\": \"Rsph6a knockout mouse model, immunofluorescence of sperm flagella\",\n      \"journal\": \"Journal of cell science\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Weak — single genetic KO model with immunofluorescence, single lab, single method for the RSPH9-specific finding\",\n      \"pmids\": [\"30185526\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2022,\n      \"finding\": \"SPEF2 interacts with RSPH9 in vitro, suggesting SPEF2 and RSPH9 functionally cooperate during sperm flagellar assembly\",\n      \"method\": \"Co-immunoprecipitation in vitro (proteomic analysis of SPEF2 mutant patient spermatozoa plus in vitro interaction assay)\",\n      \"journal\": \"Asian journal of andrology\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 3 / Weak — single in vitro interaction assay, single lab, no mutagenesis confirmation\",\n      \"pmids\": [\"34755699\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2023,\n      \"finding\": \"Purified recombinant LRRC23 directly interacts with RSPH9 (an RS head protein), and this interaction is abolished by C-terminal truncation of LRRC23; cryo-electron tomography shows absence of the RS3 head in LRRC23 mutant spermatozoa, placing RSPH9 as a component of the RS3 head and demonstrating that LRRC23 is required for RS3 head assembly via its interaction with RSPH9\",\n      \"method\": \"Recombinant protein interaction assay (purified proteins), C-terminal truncation mutagenesis, cryo-electron tomography of mutant spermatozoa\",\n      \"journal\": \"eLife\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 / Moderate — in vitro reconstitution with mutagenesis plus structural validation by cryo-ET, single lab but multiple orthogonal methods\",\n      \"pmids\": [\"38091523\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2023,\n      \"finding\": \"LRRC23 interacts with RSPH9 (RS head protein) in vitro, and C-terminal truncation abolishes this interaction; cryo-ET confirms RS3 head loss in LRRC23 mutant sperm (preprint version of the eLife paper above)\",\n      \"method\": \"Recombinant protein interaction assay, mutagenesis, cryo-electron tomography\",\n      \"journal\": \"bioRxiv\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 1 / Weak — preprint with same data as peer-reviewed eLife paper; confidence deferred to peer-reviewed version\",\n      \"pmids\": [\"36865175\"],\n      \"is_preprint\": true\n    },\n    {\n      \"year\": 2023,\n      \"finding\": \"Pathogenic variants in RSPH9 cause male infertility due to sperm cell dysmotility and abnormal flagellar RSPH9 protein composition, demonstrated for the first time by immunofluorescence microscopy in sperm cells from an RSPH9-mutant individual\",\n      \"method\": \"Next-generation sequencing, immunofluorescence microscopy of sperm flagella, high-speed video microscopy, transmission electron microscopy, semen analysis\",\n      \"journal\": \"Frontiers in genetics\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Weak — multiple diagnostic methods in a single patient, single lab; first demonstration of RSPH9 deficiency in sperm flagella causing dysmotility\",\n      \"pmids\": [\"36873931\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2025,\n      \"finding\": \"RSPH9 is identified as a component of radial spoke 1 (RS1) head in human and mouse sperm flagella; RSPH9, along with RSPH3, RSPH6A, and DYDC1, constitutes the RS1 head; DNAH12 interacts with radial spoke head proteins RSPH1, RSPH9, and DNAJB13 to regulate central pair stability in sperm flagella\",\n      \"method\": \"Protein mass spectrometry, western blotting, co-immunoprecipitation, Iqub-/- mouse model, bioinformatic structural modeling\",\n      \"journal\": \"Cell communication and signaling : CCS\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — mass spectrometry identification plus Co-IP interaction with DNAH12 and structural assignment via multiple methods, single lab\",\n      \"pmids\": [\"39849482\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2024,\n      \"finding\": \"DNAH12 interacts with radial spoke head proteins RSPH1, RSPH9, and DNAJB13; disruption of DNAH12 compromises central pair stability; this interaction positions RSPH9 functionally near the inner dynein arm/central pair regulatory axis in sperm flagella\",\n      \"method\": \"Co-immunoprecipitation, mouse knockout model (Dnah12-/-), TEM, immunofluorescence\",\n      \"journal\": \"bioRxiv\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Weak — Co-IP plus KO model in a preprint; single lab, interaction confirmed by pulldown\",\n      \"pmids\": [],\n      \"is_preprint\": true\n    },\n    {\n      \"year\": 2017,\n      \"finding\": \"RSPH9 is a high-abundance component of human airway ciliary axonemes, quantified at 1850 fmol by label-free LC/MSE, establishing it as one of the most abundant non-tubulin axonemal proteins\",\n      \"method\": \"Label-free quantitative LC/MSE proteomics of human airway cilia axonemes\",\n      \"journal\": \"Journal of proteome research\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Weak — quantitative proteomic localization to ciliary axoneme, single lab, no functional validation of abundance\",\n      \"pmids\": [\"28282151\"],\n      \"is_preprint\": false\n    }\n  ],\n  \"current_model\": \"RSPH9 is a component of the radial spoke head in axonemal '9+2' motile cilia and sperm flagella, where it is required for radial spoke head assembly and central pair microtubule stability; its axonemal localization depends on upstream assembly factors RSPH4A and RSPH1 (establishing a RSPH4A > RSPH1 > RSPH9 hierarchy), it constitutes the RS1 head along with RSPH3, RSPH6A, and DYDC1, and it physically interacts with LRRC23 (an RS3 head assembly factor), SPEF2, and DNAH12; loss of RSPH9 converts ciliary beat from planar to rotational, causes central pair loss, and leads to hydrocephalus in mice and primary ciliary dyskinesia with sperm dysmotility and male infertility in humans.\"\n}\n```","stage2_raw":"{\n  \"mechanistic_narrative\": \"RSPH9 is a core structural component of the radial spoke head of axonemal '9+2' motile cilia and sperm flagella, where it is required for radial spoke head assembly, central pair microtubule stability, and the normal planar ciliary beat [#0, #3]. Its incorporation into the axoneme is governed by an ordered assembly hierarchy in respiratory cilia, RSPH4A > RSPH1 > RSPH9, such that loss of either upstream factor strips RSPH9 from cilia while RSPH9 loss leaves RSPH4A and RSPH1 assembly intact [#1, #2]; in sperm flagella RSPH6A acts upstream of RSPH9 [#6]. Within the spoke architecture RSPH9 constitutes the RS1 head together with RSPH3, RSPH6A, and DYDC1, and also localizes to the RS3 head where its direct interaction with LRRC23 is required for RS3 head assembly [#8, #11]; it further engages SPEF2 and the dynein DNAH12, the latter coupling the radial spoke head to central pair stability [#7, #11, #12]. Loss of RSPH9 causes near-complete central pair loss and converts the ciliary beat from planar to rotational, producing neonatal hydrocephalus in mice and, in humans, primary ciliary dyskinesia with sperm dysmotility and male infertility [#3, #5, #10].\",\n  \"teleology\": [\n    {\n      \"year\": 2009,\n      \"claim\": \"Established RSPH9 as a disease gene and assigned it to the radial spoke head, answering whether this gene is causally required for normal motile cilia function.\",\n      \"evidence\": \"Positional cloning of PCD families plus morpholino knockdown with rescue in zebrafish and Chlamydomonas\",\n      \"pmids\": [\"19200523\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Did not resolve the molecular activity of RSPH9 within the spoke head\", \"No structural placement within the radial spoke\"]\n    },\n    {\n      \"year\": 2014,\n      \"claim\": \"Showed RSPH9 axonemal assembly depends on RSPH1, indicating RSPH9 is part of an interdependent spoke head module rather than independently anchored.\",\n      \"evidence\": \"Patient cilia immunofluorescence and TEM with defined RSPH1 mutations\",\n      \"pmids\": [\"24518672\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Did not define the full ordering relative to RSPH4A\", \"Mechanism of recruitment not resolved\"]\n    },\n    {\n      \"year\": 2015,\n      \"claim\": \"Resolved the assembly hierarchy RSPH4A > RSPH1 > RSPH9, establishing RSPH9 as a terminal/dependent member whose loss does not destabilize upstream components.\",\n      \"evidence\": \"High-resolution immunofluorescence across multiple patient genotypes in respiratory cilia\",\n      \"pmids\": [\"25789548\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Hierarchy defined for respiratory cilia, not sperm flagella\", \"Does not show direct physical contacts between hierarchy members\"]\n    },\n    {\n      \"year\": 2016,\n      \"claim\": \"Extended RSPH9 function beyond canonical 9+2 cilia by showing it localizes to and is required for both 9+2 and 9+0 axonemes and sensory kinocilia.\",\n      \"evidence\": \"CRISPR mutagenesis, localization, and behavioral/structural assays in zebrafish\",\n      \"pmids\": [\"27687975\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Mechanism of RSPH9 function in 9+0 cilia lacking a central pair unexplained\", \"Mammalian relevance of kinocilia role not tested\"]\n    },\n    {\n      \"year\": 2018,\n      \"claim\": \"Linked RSPH9 depletion mechanistically to central pair loss and beat-pattern conversion, and showed it stabilizes a network of radial spoke proteins.\",\n      \"evidence\": \"RNAi knockdown in mouse ependymal cells with high-speed video, TEM, and RS protein quantification\",\n      \"pmids\": [\"30383886\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Does not establish which interactions are direct\", \"Causal order between central pair loss and beat change unresolved\"]\n    },\n    {\n      \"year\": 2018,\n      \"claim\": \"Placed RSPH6A upstream of RSPH9 in sperm flagellar spoke assembly, indicating tissue-specific upstream dependencies.\",\n      \"evidence\": \"Rsph6a knockout mouse with sperm flagella immunofluorescence\",\n      \"pmids\": [\"30185526\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Single KO model with single readout for the RSPH9-specific finding\", \"Direct interaction not tested\"]\n    },\n    {\n      \"year\": 2022,\n      \"claim\": \"Identified SPEF2 as a physical partner of RSPH9, suggesting cooperation during flagellar assembly.\",\n      \"evidence\": \"In vitro co-immunoprecipitation alongside SPEF2-mutant patient sperm proteomics\",\n      \"pmids\": [\"34755699\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Single in vitro interaction without mutagenesis confirmation\", \"Functional consequence of the interaction not established\"]\n    },\n    {\n      \"year\": 2023,\n      \"claim\": \"Provided the first direct biochemical and structural placement of RSPH9 in the RS3 head via its LRRC23 interaction, defining a specific binding interface required for RS3 head assembly.\",\n      \"evidence\": \"Purified recombinant protein interaction with C-terminal truncation mutagenesis and cryo-ET of mutant spermatozoa\",\n      \"pmids\": [\"38091523\", \"36865175\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Mapped LRRC23 interface but not the RSPH9 residues involved\", \"RS3 vs RS1 head dual assignment not fully reconciled\"]\n    },\n    {\n      \"year\": 2023,\n      \"claim\": \"Demonstrated RSPH9 deficiency in human sperm flagella causing dysmotility, extending the PCD phenotype to male infertility with altered flagellar RSPH9 composition.\",\n      \"evidence\": \"NGS, immunofluorescence, high-speed video, and TEM of sperm from an RSPH9-mutant individual\",\n      \"pmids\": [\"36873931\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Single patient\", \"Does not dissect molecular basis of flagellar dysmotility\"]\n    },\n    {\n      \"year\": 2025,\n      \"claim\": \"Assigned RSPH9 to the RS1 head with RSPH3, RSPH6A, and DYDC1, and linked it to central pair stability through DNAH12, integrating the spoke head with a dynein/central pair regulatory axis.\",\n      \"evidence\": \"Mass spectrometry, Co-IP, structural modeling, and Iqub/Dnah12 mouse models\",\n      \"pmids\": [\"39849482\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Direct vs indirect nature of DNAH12 interaction unclear\", \"Reconciliation of RS1 and RS3 head assignments incomplete\"]\n    },\n    {\n      \"year\": null,\n      \"claim\": \"The molecular activity of RSPH9 within the spoke head — its precise structural role and how it couples spoke head integrity to central pair maintenance — remains undefined.\",\n      \"evidence\": \"\",\n      \"pmids\": [],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"No enzymatic or biochemical activity assigned\", \"Mechanism linking spoke head loss to central pair collapse not resolved\", \"Full set of direct binding partners and stoichiometry within the radial spoke unknown\"]\n    }\n  ],\n  \"mechanism_profile\": {\n    \"molecular_activity\": [\n      {\"term_id\": \"GO:0005198\", \"supporting_discovery_ids\": [0, 3, 8, 11, 13]}\n    ],\n    \"localization\": [\n      {\"term_id\": \"GO:0005929\", \"supporting_discovery_ids\": [0, 3, 4, 13]},\n      {\"term_id\": \"GO:0005856\", \"supporting_discovery_ids\": [3, 4, 13]}\n    ],\n    \"pathway\": [],\n    \"complexes\": [\"radial spoke head (RS1 head)\", \"radial spoke head (RS3 head)\"],\n    \"partners\": [\"LRRC23\", \"SPEF2\", \"DNAH12\", \"RSPH1\", \"RSPH3\", \"RSPH6A\", \"DYDC1\", \"DNAJB13\"],\n    \"other_free_text\": []\n  }\n}","audit_flag":null,"evaluation":{"pairwise":"win","faith_supported":4,"faith_total":4,"faith_pct":100.0}}