{"gene":"ODF1","run_date":"2026-06-10T05:19:52","timeline":{"discoveries":[{"year":1990,"finding":"RT7 (ODF1) encodes a putative 90-amino acid protein with an N-terminal amphipathic alpha helix containing a leucine zipper-like structure; it is specifically expressed at very high levels in rat early spermatids and not detectable in any other tissue.","method":"Differential cDNA cloning, nucleotide sequencing, transcription start site mapping","journal":"Developmental biology","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — molecular characterization by sequencing and mapping in a single focused study; expression domain established by multiple independent methods","pmids":["1699827"],"is_preprint":false},{"year":1992,"finding":"The Odf1 promoter is positively regulated by a testis-specific transcription factor TTF-D, a factor similar to CREB, and a nuclear factor binding immediately upstream of the transcription start site, as demonstrated in an in vitro transcription system derived from rat seminiferous epithelium.","method":"In vitro transcription assay (seminiferous epithelium nuclear extracts), DNase I footprinting, gel retardation (EMSA)","journal":"Proceedings of the National Academy of Sciences of the United States of America","confidence":"High","confidence_rationale":"Tier 1 / Moderate — in vitro transcription reconstitution plus DNase I footprinting and EMSA in a single focused study with multiple orthogonal methods","pmids":["1731343"],"is_preprint":false},{"year":1994,"finding":"ODF1 (RT7) protein localizes to the sperm tail and self-associates through a region in the N-terminal half, forming stable complexes with itself, consistent with it being a structural component of sperm tail outer dense fibers.","method":"Immunofluorescence microscopy, confocal laser immunofluorescence, co-immunoprecipitation with deletion analysis","journal":"Biology of reproduction","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — reciprocal co-IP with deletion mapping plus direct localization by immunofluorescence, single lab","pmids":["7521678"],"is_preprint":false},{"year":1996,"finding":"Odf1 mRNA is transcribed from step 6 round spermatids through step 17, but the bulk is stored in translationally inactive ribonucleoprotein particles; translation is greatly enhanced in the maturation phase of spermiogenesis coinciding with marked increase in outer dense fiber diameter.","method":"In situ hybridization, immunohistochemistry, polysome fractionation on sucrose gradients, Northern blot","journal":"Molecular reproduction and development","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — multiple orthogonal methods (polysome fractionation, in situ hybridization, immunohistochemistry) in a single focused study","pmids":["8873064"],"is_preprint":false},{"year":1997,"finding":"ODF1 (Odf27) interacts with the major 84-kDa outer dense fiber protein ODF2 (Odf84) via leucine zippers; all leucine residues in the upstream leucine zipper of ODF2 are required for interaction with ODF1.","method":"Yeast two-hybrid screen with ODF1 leucine zipper as bait, fluorescence microscopy, immunoelectron microscopy, leucine-to-alanine mutagenesis","journal":"The Journal of biological chemistry","confidence":"High","confidence_rationale":"Tier 1 / Strong — yeast two-hybrid with mutagenesis validation plus localization by immunoelectron microscopy; replicated and extended in multiple subsequent studies","pmids":["9045620"],"is_preprint":false},{"year":1999,"finding":"SPAG4 (a 49-kDa spermatid-specific protein) interacts specifically with ODF1 but not ODF2 via a leucine zipper, and localizes to the manchette and axoneme of spermatids, suggesting a role in protein transport to sperm tail structures.","method":"Yeast two-hybrid cloning using ODF1 as bait, co-immunoprecipitation, immunofluorescence microscopy","journal":"Developmental biology","confidence":"High","confidence_rationale":"Tier 2 / Strong — yeast two-hybrid interaction confirmed by co-IP plus subcellular localization established by immunofluorescence; replicated in subsequent papers","pmids":["10373309"],"is_preprint":false},{"year":1999,"finding":"TTF-D, a testis-specific nuclear factor containing three peptides (22, 25, and 35 kDa), binds both double-stranded and single-stranded DNA at cognate sites in the Odf1 and c-mos promoters and activates Odf1 promoter activity; both ds and ss binding site oligonucleotides can specifically repress Odf1 promoter activity.","method":"Electrophoretic mobility shift assay (EMSA), promoter-reporter transcription assays, competition with single-stranded and double-stranded oligonucleotides","journal":"The Journal of biological chemistry","confidence":"Medium","confidence_rationale":"Tier 1–2 / Moderate — in vitro binding assays plus functional promoter assays in a single focused study","pmids":["10206985"],"is_preprint":false},{"year":2001,"finding":"SPAG5, a 200-kDa testicular protein with similarity to the mitotic spindle protein Deepest, interacts strongly with ODF1 via a leucine zipper in its C-terminal region; SPAG5 is expressed in pachytene spermatocytes and spermatids.","method":"Yeast two-hybrid cloning using ODF1 as bait, deletion mutagenesis of leucine zipper","journal":"Molecular reproduction and development","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — yeast two-hybrid with deletion mapping, single lab","pmids":["11468777"],"is_preprint":false},{"year":2003,"finding":"OIP1, a novel RING finger protein (H2 subclass), binds specifically to evolutionarily conserved Cys-Gly-Pro repeats in the C-terminus of ODF1; deletion of the RING motif significantly decreases ODF1 binding, and OIP1 localizes to the sperm tail.","method":"Yeast two-hybrid screen using ODF1 N-terminal leucine zipper as bait, deletion mutagenesis, immunofluorescence localization","journal":"Biology of reproduction","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — yeast two-hybrid with deletion mutagenesis and localization, single lab","pmids":["12533418"],"is_preprint":false},{"year":2007,"finding":"Cdk5/p35 phosphorylates ODF1 specifically at Ser193 in the C-terminal Cys-X-Pro region, and this phosphorylation enhances interaction between ODF1 and the RING finger E3 ubiquitin ligase candidate OIP1; ODF2 interacts with Cdk5 and p35 individually but not with the Cdk5/p35 heterodimer, and Cdk5/p35 does not phosphorylate ODF2.","method":"In vitro kinase assay, mass spectrometry (phosphosite identification), co-immunoprecipitation with deletion mutants, binding assays with phospho-mimetic/phospho-null mutants","journal":"Cellular physiology and biochemistry","confidence":"High","confidence_rationale":"Tier 1 / Moderate — in vitro phosphorylation assay with mass spectrometry phosphosite identification, plus functional interaction assay, multiple orthogonal methods in one study","pmids":["17762160"],"is_preprint":false},{"year":2011,"finding":"ODF1/HSPB10 is essential for tight linkage of the sperm head to the tail and for correct organization of the mitochondrial sheath and outer dense fibers; Odf1-null male mice are infertile due to sperm decapitation, while heterozygous males are fertile but show reduced sperm motility.","method":"Targeted gene disruption (knockout mouse), transmission electron microscopy, sperm motility assays","journal":"Molecular and cellular biology","confidence":"High","confidence_rationale":"Tier 2 / Strong — clean knockout with defined cellular and ultrastructural phenotypes, replicated by multiple subsequent studies","pmids":["22037768"],"is_preprint":false},{"year":2014,"finding":"Haplo-deficiency of ODF1 in incipient congenic (129/Sv background) mice causes an enlargement of the distance between the nuclear membrane and capitulum, indicating weakening of sperm head-to-tail coupling, with severe reduction in male fecundity without detectable abnormal sperm parameters by routine semen analysis.","method":"Targeted gene disruption, successive backcrossing, ultrastructural analysis by transmission electron microscopy","journal":"Reproduction (Cambridge, England)","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — genetic (haplo-deficiency) model with ultrastructural quantification, single lab extending prior knockout study","pmids":["25118300"],"is_preprint":false},{"year":2019,"finding":"CCDC42 interacts with both ODF1 and ODF2 in male germ cells and localizes to the manchette, connecting piece (HTCA), and sperm tail; in somatic cells CCDC42 localizes to the centrosome, and its centrosomal/sperm tail localization appears independent of ODF1.","method":"Co-immunoprecipitation, immunofluorescence microscopy in spermatids and somatic cells","journal":"Frontiers in cell and developmental biology","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — co-IP demonstrating interaction plus subcellular localization by immunofluorescence, single lab","pmids":["31475146"],"is_preprint":false},{"year":2019,"finding":"ODF1 protein (and its mRNA) is expressed in rat kidney collecting ducts, demonstrating that ODF1 is not exclusively a testicular/sperm protein.","method":"Western blot, immunofluorescence, RT-PCR, proteomic analysis by mass spectrometry","journal":"Heliyon","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — four independent/orthogonal detection methods in a single focused study, single lab","pmids":["31867458"],"is_preprint":false},{"year":2022,"finding":"ODF1 is dispensable for the structural development of the connecting piece (which develops normally in ODF1-deficient spermatids by TEM), but is required for stable mechanical linkage of sperm head and tail; decapitation occurs when force is applied, indicating a maintenance/stabilization rather than assembly role.","method":"Transmission electron microscopy of developing spermatids from Odf1 knockout mice","journal":"International journal of molecular sciences","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — clean knockout model with ultrastructural analysis at defined developmental stages, single lab","pmids":["36142191"],"is_preprint":false},{"year":2024,"finding":"WDR64 (a testis-specific WD40 repeat protein) interacts with ODF1 to form a protein complex; the WDR64/ODF1 complex localizes to the manchette during nucleus shaping and to the midpiece of mature spermatozoa, implicating it in manchette and flagellum assembly.","method":"Immunoprecipitation–mass spectrometry (IP-MS), immunofluorescence microscopy","journal":"Heliyon","confidence":"Medium","confidence_rationale":"Tier 2 / Weak — IP-MS interaction plus co-localization by immunofluorescence, single lab, single method for interaction","pmids":["39386799"],"is_preprint":false},{"year":2026,"finding":"TENT5C poly(A) polymerase extends the poly(A) tail of Odf1 mRNA in spermatids; in the absence of TENT5C catalytic activity, Odf1 transcripts have shorter poly(A) tails, ODF1 protein fails to accumulate at the spermatid neck, and mice produce headless spermatozoa with flagellar abnormalities phenocopying ODF1 deficiency.","method":"Poly(A) tail profiling across transcriptome, Western blot, immunofluorescence localization of ODF1 protein, catalytically inactive TENT5C knock-in mouse model","journal":"Nature communications","confidence":"High","confidence_rationale":"Tier 1–2 / Moderate — catalytic mutant knock-in with transcriptome-wide poly(A) profiling plus direct ODF1 protein localization and sperm phenotype, multiple orthogonal methods in a single rigorous study","pmids":["42009655"],"is_preprint":false}],"current_model":"ODF1/HSPB10 is a small heat shock protein that forms the structural core of sperm tail outer dense fiber medulla via leucine-zipper-mediated self-association and interactions with ODF2, SPAG4, SPAG5, CCDC42, WDR64, and OIP1 (a RING-finger E3 ligase candidate); Cdk5/p35 phosphorylates ODF1 at Ser193 to enhance ODF1–OIP1 binding, suggesting a regulated degradation pathway; translational activation of Odf1 mRNA is controlled by TENT5C-mediated poly(A) tail extension at the spermatid neck; and ODF1 is essential not for the structural assembly of the connecting piece but for the mechanical stabilization of the sperm head-to-tail linkage, with its absence causing sperm decapitation and male infertility in mice."},"narrative":{"mechanistic_narrative":"ODF1 (HSPB10) is a spermatid-specific structural protein that forms a core component of the sperm tail outer dense fibers and mediates the mechanical coupling of the sperm head to the flagellum [PMID:1699827, PMID:22037768]. It self-associates through an N-terminal region containing a leucine-zipper-like motif and uses leucine zippers to nucleate a network of sperm tail interactions, binding the major outer dense fiber protein ODF2 as well as SPAG4, SPAG5, OIP1, CCDC42, and WDR64 [PMID:7521678, PMID:9045620, PMID:10373309, PMID:11468777, PMID:12533418, PMID:31475146, PMID:39386799]. Several of these partners are recruited to or localize at the manchette and connecting piece, positioning ODF1 within the apparatus that builds and links the sperm neck and tail [PMID:10373309, PMID:31475146, PMID:39386799]. ODF1 is post-translationally regulated: Cdk5/p35 phosphorylates ODF1 at Ser193 in its C-terminal Cys-X-Pro region, enhancing binding to the RING-finger E3 ligase candidate OIP1 [PMID:17762160]. Knockout and haplo-deficiency studies establish that ODF1 is dispensable for assembling the connecting piece but is required to stabilize the head-to-tail linkage; its loss causes sperm decapitation, mitochondrial sheath and outer dense fiber disorganization, and male infertility in mice [PMID:22037768, PMID:25118300, PMID:36142191]. Odf1 expression is controlled at multiple levels — transcriptionally by the testis-specific factor TTF-D and a CREB-like factor at its promoter [PMID:1731343, PMID:10206985], and translationally through storage of its mRNA in inactive ribonucleoprotein particles with later activation, including TENT5C-mediated poly(A) tail extension required for ODF1 accumulation at the spermatid neck [PMID:8873064, PMID:42009655].","teleology":[{"year":1990,"claim":"Established the molecular identity of ODF1 as a small spermatid-specific protein bearing a leucine-zipper-like N-terminal helix, framing it as a candidate structural/interaction protein of the developing sperm tail.","evidence":"Differential cDNA cloning and sequencing in rat early spermatids","pmids":["1699827"],"confidence":"Medium","gaps":["Subcellular localization and binding partners not yet defined","Function of the leucine-zipper motif untested"]},{"year":1992,"claim":"Defined how the cell-type-restricted expression of Odf1 is achieved, identifying promoter elements bound by a testis-specific factor and a CREB-like factor.","evidence":"In vitro transcription, DNase I footprinting and EMSA with seminiferous epithelium extracts","pmids":["1731343"],"confidence":"High","gaps":["Molecular identity of TTF-D not yet resolved","In vivo requirement of these elements untested"]},{"year":1994,"claim":"Showed that ODF1 localizes to the sperm tail and self-associates via its N-terminal half, supporting a structural role in outer dense fibers.","evidence":"Immunofluorescence and reciprocal co-IP with deletion mapping","pmids":["7521678"],"confidence":"Medium","gaps":["Stoichiometry and higher-order assembly unknown","Single-lab data"]},{"year":1996,"claim":"Revealed that ODF1 output is gated translationally, with mRNA stored in inactive RNP particles and translated during the maturation phase as ODF diameter increases.","evidence":"In situ hybridization, immunohistochemistry and polysome fractionation","pmids":["8873064"],"confidence":"Medium","gaps":["Molecular machinery controlling the storage-to-translation switch not identified"]},{"year":1997,"claim":"Identified ODF2 as a direct leucine-zipper partner of ODF1, defining the core protein-protein contact of the outer dense fiber.","evidence":"Yeast two-hybrid with leucine-to-alanine mutagenesis and immunoelectron microscopy","pmids":["9045620"],"confidence":"High","gaps":["In vivo assembly hierarchy of ODF1/ODF2 not established"]},{"year":1999,"claim":"Expanded the ODF1 interactome with SPAG4 (manchette/axoneme) and connected the protein to candidate tail-protein transport.","evidence":"Yeast two-hybrid, co-IP and immunofluorescence","pmids":["10373309"],"confidence":"High","gaps":["Functional consequence of SPAG4 binding untested in vivo"]},{"year":1999,"claim":"Characterized the DNA-binding behavior of the testis-specific factor TTF-D, showing it binds both ds and ss Odf1 promoter sites and activates transcription.","evidence":"EMSA and promoter-reporter assays with ss/ds oligonucleotide competition","pmids":["10206985"],"confidence":"Medium","gaps":["Identity of TTF-D peptides not cloned","Mechanism of ss vs ds binding unresolved"]},{"year":2001,"claim":"Added SPAG5 as a leucine-zipper ODF1 partner expressed across spermatocytes and spermatids.","evidence":"Yeast two-hybrid with deletion mutagenesis","pmids":["11468777"],"confidence":"Medium","gaps":["No co-IP or localization confirmation in this study","Functional role undetermined"]},{"year":2003,"claim":"Linked ODF1 to a potential ubiquitin-mediated regulatory pathway by identifying the RING-finger protein OIP1 binding ODF1's conserved C-terminal Cys-Gly-Pro repeats.","evidence":"Yeast two-hybrid, deletion mutagenesis and immunofluorescence","pmids":["12533418"],"confidence":"Medium","gaps":["E3 ligase activity of OIP1 toward ODF1 not demonstrated","No degradation assay"]},{"year":2007,"claim":"Connected a kinase signal to the ODF1-OIP1 axis, showing Cdk5/p35 phosphorylates ODF1 at Ser193 to enhance OIP1 binding, implying regulated turnover.","evidence":"In vitro kinase assay, mass spectrometry phosphosite mapping, phospho-mutant binding assays","pmids":["17762160"],"confidence":"High","gaps":["Functional consequence of phospho-enhanced OIP1 binding in vivo not shown","ODF1 ubiquitination/degradation not directly demonstrated"]},{"year":2011,"claim":"Established ODF1's essential physiological role: it is required for tight head-to-tail linkage and proper mitochondrial sheath/ODF organization, with knockout males infertile from decapitation.","evidence":"Knockout mouse, transmission electron microscopy, motility assays","pmids":["22037768"],"confidence":"High","gaps":["Molecular basis of mechanical coupling not resolved","Whether defect is assembly or maintenance unclear at this stage"]},{"year":2014,"claim":"Demonstrated dose sensitivity of the linkage, with haplo-deficiency widening the nuclear membrane-to-capitulum distance and reducing fecundity despite normal routine semen parameters.","evidence":"Targeted disruption with backcrossing and ultrastructural analysis","pmids":["25118300"],"confidence":"Medium","gaps":["Single genetic background","Mechanism linking ODF1 dosage to coupling strength unknown"]},{"year":2019,"claim":"Placed ODF1 in a connecting-piece/manchette network by showing CCDC42 binds both ODF1 and ODF2 yet localizes independently of ODF1.","evidence":"Co-IP and immunofluorescence in germ and somatic cells","pmids":["31475146"],"confidence":"Medium","gaps":["Functional interdependence of CCDC42 and ODF1 not tested"]},{"year":2019,"claim":"Challenged the strict testis-exclusivity of ODF1 by detecting it in rat kidney collecting ducts.","evidence":"Western blot, immunofluorescence, RT-PCR, mass spectrometry","pmids":["31867458"],"confidence":"Medium","gaps":["Function of ODF1 in kidney unknown","Not confirmed in other species"]},{"year":2022,"claim":"Resolved the assembly-versus-maintenance question, showing the connecting piece forms normally without ODF1 but fails mechanically under force, defining ODF1 as a stabilizer rather than a builder.","evidence":"TEM of developing spermatids from knockout mice","pmids":["36142191"],"confidence":"Medium","gaps":["Molecular nature of the stabilizing interaction unidentified"]},{"year":2024,"claim":"Added WDR64 as an ODF1 complex partner spanning the manchette and midpiece, implicating the complex in nucleus shaping and flagellum assembly.","evidence":"IP-MS and immunofluorescence co-localization","pmids":["39386799"],"confidence":"Medium","gaps":["Single method for interaction","In vivo requirement of WDR64-ODF1 complex untested"]},{"year":2026,"claim":"Defined an upstream translational control mechanism: TENT5C-mediated poly(A) extension of Odf1 mRNA is required for ODF1 accumulation at the spermatid neck, with loss phenocopying ODF1 deficiency.","evidence":"Catalytically inactive TENT5C knock-in mouse, transcriptome poly(A) profiling, Western blot and immunofluorescence","pmids":["42009655"],"confidence":"High","gaps":["How TENT5C is targeted specifically to Odf1 mRNA unknown","Direct vs indirect effect on ODF1 not fully separated"]},{"year":null,"claim":"It remains unknown whether the Cdk5/OIP1 phosphorylation-degradation model operates in vivo, and what molecular interaction physically transmits the stabilizing force at the head-tail junction.","evidence":"No timeline study directly demonstrates ODF1 ubiquitination/turnover in vivo or the biophysical basis of head-tail coupling","pmids":[],"confidence":"Low","gaps":["No in vivo demonstration of OIP1-mediated ODF1 degradation","Biophysical mechanism of mechanical stabilization unresolved","Function of non-testicular ODF1 unaddressed"]}],"mechanism_profile":{"molecular_activity":[{"term_id":"GO:0005198","term_label":"structural molecule activity","supporting_discovery_ids":[2,4,10]}],"localization":[{"term_id":"GO:0005856","term_label":"cytoskeleton","supporting_discovery_ids":[2,10]},{"term_id":"GO:0005815","term_label":"microtubule organizing center","supporting_discovery_ids":[12]}],"pathway":[{"term_id":"R-HSA-1474165","term_label":"Reproduction","supporting_discovery_ids":[10,16]}],"complexes":["sperm tail outer dense fibers","WDR64/ODF1 complex"],"partners":["ODF2","SPAG4","SPAG5","OIP1","CCDC42","WDR64","CDK5"],"other_free_text":[]}},"prefetch_data":{"uniprot":{"accession":"Q14990","full_name":"Outer dense fiber protein 1","aliases":["Heat shock protein beta-10","HspB10","Heat shock protein family B member 10"],"length_aa":250,"mass_kda":28.4,"function":"Component of the outer dense fibers (ODF) of spermatozoa. ODF are filamentous structures located on the outside of the axoneme in the midpiece and principal piece of the mammalian sperm tail and may help to maintain the passive elastic structures and elastic recoil of the sperm tail","subcellular_location":"Cell projection, cilium, flagellum; Cytoplasm, cytoskeleton; Cytoplasm, cytoskeleton, microtubule organizing center, centrosome","url":"https://www.uniprot.org/uniprotkb/Q14990/entry"},"depmap":{"release":"DepMap","has_data":true,"is_common_essential":false,"resolved_as":"","url":"https://depmap.org/portal/gene/ODF1","classification":"Not Classified","n_dependent_lines":37,"n_total_lines":1208,"dependency_fraction":0.030629139072847682},"opencell":{"profiled":false,"resolved_as":"","ensg_id":"","cell_line_id":"","localizations":[],"interactors":[],"url":"https://opencell.sf.czbiohub.org/search/ODF1","total_profiled":1310},"omim":[{"mim_id":"621432","title":"WD REPEAT-CONTAINING PROTEIN 64; WDR64","url":"https://www.omim.org/entry/621432"},{"mim_id":"610874","title":"SPERMATOGENESIS AND CENTRIOLE-ASSOCIATED 1; SPATC1","url":"https://www.omim.org/entry/610874"},{"mim_id":"607663","title":"DEAD-BOX HELICASE 25; DDX25","url":"https://www.omim.org/entry/607663"},{"mim_id":"603038","title":"SPERM-ASSOCIATED ANTIGEN 4; SPAG4","url":"https://www.omim.org/entry/603038"},{"mim_id":"602015","title":"OUTER DENSE FIBER OF SPERM TAILS 2; ODF2","url":"https://www.omim.org/entry/602015"}],"hpa":{"profiled":true,"resolved_as":"","reliability":"Approved","locations":[{"location":"Connecting piece","reliability":"Approved"},{"location":"Flagellar centriole","reliability":"Approved"},{"location":"Mid piece","reliability":"Approved"}],"tissue_specificity":"Tissue enriched","tissue_distribution":"Detected in single","driving_tissues":[{"tissue":"testis","ntpm":333.0}],"url":"https://www.proteinatlas.org/search/ODF1"},"hgnc":{"alias_symbol":["ODFPG","ODF27","RT7","HSPB10","CT133"],"prev_symbol":[]},"alphafold":{"accession":"Q14990","domains":[{"cath_id":"2.60.40.790","chopping":"126-200","consensus_level":"high","plddt":85.5649,"start":126,"end":200},{"cath_id":"1.10.287","chopping":"2-56_66-121","consensus_level":"medium","plddt":56.9321,"start":2,"end":121}],"viewer_url":"https://alphafold.ebi.ac.uk/entry/Q14990","model_url":"https://alphafold.ebi.ac.uk/files/AF-Q14990-F1-model_v6.cif","pae_url":"https://alphafold.ebi.ac.uk/files/AF-Q14990-F1-predicted_aligned_error_v6.png","plddt_mean":62.09},"mouse_models":{"mgi_url":"https://www.informatics.jax.org/marker/summary?nomen=ODF1","jax_strain_url":"https://www.jax.org/strain/search?query=ODF1"},"sequence":{"accession":"Q14990","fasta_url":"https://rest.uniprot.org/uniprotkb/Q14990.fasta","uniprot_url":"https://www.uniprot.org/uniprotkb/Q14990/entry","alphafold_viewer_url":"https://alphafold.ebi.ac.uk/entry/Q14990"}},"corpus_meta":[{"pmid":"10373309","id":"PMC_10373309","title":"Spag4, a novel sperm protein, binds outer dense-fiber protein Odf1 and localizes to microtubules of manchette and axoneme.","date":"1999","source":"Developmental biology","url":"https://pubmed.ncbi.nlm.nih.gov/10373309","citation_count":134,"is_preprint":false},{"pmid":"22037768","id":"PMC_22037768","title":"The small heat shock protein ODF1/HSPB10 is essential for tight linkage of sperm head to tail and male fertility in mice.","date":"2011","source":"Molecular and cellular biology","url":"https://pubmed.ncbi.nlm.nih.gov/22037768","citation_count":120,"is_preprint":false},{"pmid":"9045620","id":"PMC_9045620","title":"Interactional cloning of the 84-kDa major outer dense fiber protein Odf84. 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pharmacology","url":"https://pubmed.ncbi.nlm.nih.gov/30951719","citation_count":12,"is_preprint":false},{"pmid":"10206985","id":"PMC_10206985","title":"Testis-specific TTF-D binds to single-stranded DNA in the c-mos and Odf1 promoters and activates Odf1.","date":"1999","source":"The Journal of biological chemistry","url":"https://pubmed.ncbi.nlm.nih.gov/10206985","citation_count":10,"is_preprint":false},{"pmid":"20112736","id":"PMC_20112736","title":"[Differential expression of ODF1 in human ejaculated spermatozoa and its clinical significance].","date":"2009","source":"Zhonghua nan ke xue = National journal of andrology","url":"https://pubmed.ncbi.nlm.nih.gov/20112736","citation_count":10,"is_preprint":false},{"pmid":"18562159","id":"PMC_18562159","title":"Comparative genomics reveals gene-specific and shared regulatory sequences in the spermatid-expressed mammalian Odf1, Prm1, Prm2, Tnp1, and Tnp2 genes.","date":"2008","source":"Genomics","url":"https://pubmed.ncbi.nlm.nih.gov/18562159","citation_count":9,"is_preprint":false},{"pmid":"36142191","id":"PMC_36142191","title":"Development of the Connecting Piece in ODF1-Deficient Mouse Spermatids.","date":"2022","source":"International journal of molecular sciences","url":"https://pubmed.ncbi.nlm.nih.gov/36142191","citation_count":9,"is_preprint":false},{"pmid":"11374414","id":"PMC_11374414","title":"Long-term allograft acceptance induced by single dose anti-leukocyte common antigen (RT7) antibody in the rat.","date":"2001","source":"Transplantation","url":"https://pubmed.ncbi.nlm.nih.gov/11374414","citation_count":9,"is_preprint":false},{"pmid":"32869188","id":"PMC_32869188","title":"Overexpression of ODF1 in Gastrointestinal Tract Neuroendocrine Neoplasms: a Novel Potential Immunohistochemical Biomarker for Well-differentiated Neuroendocrine Tumors.","date":"2020","source":"Endocrine pathology","url":"https://pubmed.ncbi.nlm.nih.gov/32869188","citation_count":8,"is_preprint":false},{"pmid":"31867458","id":"PMC_31867458","title":"ODF1, sperm flagelar protein is expressed in kidney collecting ducts of rats.","date":"2019","source":"Heliyon","url":"https://pubmed.ncbi.nlm.nih.gov/31867458","citation_count":7,"is_preprint":false},{"pmid":"30468833","id":"PMC_30468833","title":"CRTH2 antagonist, CT‑133, effectively alleviates cigarette smoke-induced acute lung injury.","date":"2018","source":"Life sciences","url":"https://pubmed.ncbi.nlm.nih.gov/30468833","citation_count":6,"is_preprint":false},{"pmid":"32034875","id":"PMC_32034875","title":"Lipid-Embedded Molecular Dynamics Simulation Model for Exploring the Reverse Prostaglandin D2 Agonism of CT-133 towards CRTH2 in the Treatment of Type-2 Inflammation Dependent Diseases.","date":"2020","source":"Chemistry & biodiversity","url":"https://pubmed.ncbi.nlm.nih.gov/32034875","citation_count":5,"is_preprint":false},{"pmid":"39386799","id":"PMC_39386799","title":"WDR64, a testis-specific protein, is involved in the manchette and flagellum formation by interacting with ODF1.","date":"2024","source":"Heliyon","url":"https://pubmed.ncbi.nlm.nih.gov/39386799","citation_count":3,"is_preprint":false},{"pmid":"42009655","id":"PMC_42009655","title":"TENT5C extends Odf1 poly(A) tail to sustain sperm morphogenesis and fertility.","date":"2026","source":"Nature communications","url":"https://pubmed.ncbi.nlm.nih.gov/42009655","citation_count":1,"is_preprint":false},{"pmid":null,"id":"bio_10.1101_2025.03.20.644152","title":"TENT5C extends  <i>Odf1</i>  poly(A) tail to sustain sperm morphogenesis and fertility","date":"2025-03-24","source":"bioRxiv","url":"https://doi.org/10.1101/2025.03.20.644152","citation_count":0,"is_preprint":true}],"cost":{"stage1":{"model":"claude-sonnet-4-6","input_tokens":16640,"output_tokens":3914,"usd":0.054315,"stage1_stop_reason":"end_turn"},"stage2":{"model":"claude-opus-4-8","input_tokens":11674,"output_tokens":4358,"usd":0.08366,"stage2_stop_reason":"end_turn"},"total_usd":0.137975,"stage1_batch_id":"msgbatch_013a8chtv3AWyTqv4z4sEF4C","stage2_batch_id":"msgbatch_01AHsuW63vinsvuTgzmQ3n62","note":"batch pricing = 50% of standard"},"stage1_raw":"```json\n{\n  \"discoveries\": [\n    {\n      \"year\": 1990,\n      \"finding\": \"RT7 (ODF1) encodes a putative 90-amino acid protein with an N-terminal amphipathic alpha helix containing a leucine zipper-like structure; it is specifically expressed at very high levels in rat early spermatids and not detectable in any other tissue.\",\n      \"method\": \"Differential cDNA cloning, nucleotide sequencing, transcription start site mapping\",\n      \"journal\": \"Developmental biology\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — molecular characterization by sequencing and mapping in a single focused study; expression domain established by multiple independent methods\",\n      \"pmids\": [\"1699827\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 1992,\n      \"finding\": \"The Odf1 promoter is positively regulated by a testis-specific transcription factor TTF-D, a factor similar to CREB, and a nuclear factor binding immediately upstream of the transcription start site, as demonstrated in an in vitro transcription system derived from rat seminiferous epithelium.\",\n      \"method\": \"In vitro transcription assay (seminiferous epithelium nuclear extracts), DNase I footprinting, gel retardation (EMSA)\",\n      \"journal\": \"Proceedings of the National Academy of Sciences of the United States of America\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 / Moderate — in vitro transcription reconstitution plus DNase I footprinting and EMSA in a single focused study with multiple orthogonal methods\",\n      \"pmids\": [\"1731343\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 1994,\n      \"finding\": \"ODF1 (RT7) protein localizes to the sperm tail and self-associates through a region in the N-terminal half, forming stable complexes with itself, consistent with it being a structural component of sperm tail outer dense fibers.\",\n      \"method\": \"Immunofluorescence microscopy, confocal laser immunofluorescence, co-immunoprecipitation with deletion analysis\",\n      \"journal\": \"Biology of reproduction\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — reciprocal co-IP with deletion mapping plus direct localization by immunofluorescence, single lab\",\n      \"pmids\": [\"7521678\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 1996,\n      \"finding\": \"Odf1 mRNA is transcribed from step 6 round spermatids through step 17, but the bulk is stored in translationally inactive ribonucleoprotein particles; translation is greatly enhanced in the maturation phase of spermiogenesis coinciding with marked increase in outer dense fiber diameter.\",\n      \"method\": \"In situ hybridization, immunohistochemistry, polysome fractionation on sucrose gradients, Northern blot\",\n      \"journal\": \"Molecular reproduction and development\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — multiple orthogonal methods (polysome fractionation, in situ hybridization, immunohistochemistry) in a single focused study\",\n      \"pmids\": [\"8873064\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 1997,\n      \"finding\": \"ODF1 (Odf27) interacts with the major 84-kDa outer dense fiber protein ODF2 (Odf84) via leucine zippers; all leucine residues in the upstream leucine zipper of ODF2 are required for interaction with ODF1.\",\n      \"method\": \"Yeast two-hybrid screen with ODF1 leucine zipper as bait, fluorescence microscopy, immunoelectron microscopy, leucine-to-alanine mutagenesis\",\n      \"journal\": \"The Journal of biological chemistry\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 / Strong — yeast two-hybrid with mutagenesis validation plus localization by immunoelectron microscopy; replicated and extended in multiple subsequent studies\",\n      \"pmids\": [\"9045620\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 1999,\n      \"finding\": \"SPAG4 (a 49-kDa spermatid-specific protein) interacts specifically with ODF1 but not ODF2 via a leucine zipper, and localizes to the manchette and axoneme of spermatids, suggesting a role in protein transport to sperm tail structures.\",\n      \"method\": \"Yeast two-hybrid cloning using ODF1 as bait, co-immunoprecipitation, immunofluorescence microscopy\",\n      \"journal\": \"Developmental biology\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — yeast two-hybrid interaction confirmed by co-IP plus subcellular localization established by immunofluorescence; replicated in subsequent papers\",\n      \"pmids\": [\"10373309\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 1999,\n      \"finding\": \"TTF-D, a testis-specific nuclear factor containing three peptides (22, 25, and 35 kDa), binds both double-stranded and single-stranded DNA at cognate sites in the Odf1 and c-mos promoters and activates Odf1 promoter activity; both ds and ss binding site oligonucleotides can specifically repress Odf1 promoter activity.\",\n      \"method\": \"Electrophoretic mobility shift assay (EMSA), promoter-reporter transcription assays, competition with single-stranded and double-stranded oligonucleotides\",\n      \"journal\": \"The Journal of biological chemistry\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 1–2 / Moderate — in vitro binding assays plus functional promoter assays in a single focused study\",\n      \"pmids\": [\"10206985\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2001,\n      \"finding\": \"SPAG5, a 200-kDa testicular protein with similarity to the mitotic spindle protein Deepest, interacts strongly with ODF1 via a leucine zipper in its C-terminal region; SPAG5 is expressed in pachytene spermatocytes and spermatids.\",\n      \"method\": \"Yeast two-hybrid cloning using ODF1 as bait, deletion mutagenesis of leucine zipper\",\n      \"journal\": \"Molecular reproduction and development\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — yeast two-hybrid with deletion mapping, single lab\",\n      \"pmids\": [\"11468777\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2003,\n      \"finding\": \"OIP1, a novel RING finger protein (H2 subclass), binds specifically to evolutionarily conserved Cys-Gly-Pro repeats in the C-terminus of ODF1; deletion of the RING motif significantly decreases ODF1 binding, and OIP1 localizes to the sperm tail.\",\n      \"method\": \"Yeast two-hybrid screen using ODF1 N-terminal leucine zipper as bait, deletion mutagenesis, immunofluorescence localization\",\n      \"journal\": \"Biology of reproduction\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — yeast two-hybrid with deletion mutagenesis and localization, single lab\",\n      \"pmids\": [\"12533418\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2007,\n      \"finding\": \"Cdk5/p35 phosphorylates ODF1 specifically at Ser193 in the C-terminal Cys-X-Pro region, and this phosphorylation enhances interaction between ODF1 and the RING finger E3 ubiquitin ligase candidate OIP1; ODF2 interacts with Cdk5 and p35 individually but not with the Cdk5/p35 heterodimer, and Cdk5/p35 does not phosphorylate ODF2.\",\n      \"method\": \"In vitro kinase assay, mass spectrometry (phosphosite identification), co-immunoprecipitation with deletion mutants, binding assays with phospho-mimetic/phospho-null mutants\",\n      \"journal\": \"Cellular physiology and biochemistry\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 / Moderate — in vitro phosphorylation assay with mass spectrometry phosphosite identification, plus functional interaction assay, multiple orthogonal methods in one study\",\n      \"pmids\": [\"17762160\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2011,\n      \"finding\": \"ODF1/HSPB10 is essential for tight linkage of the sperm head to the tail and for correct organization of the mitochondrial sheath and outer dense fibers; Odf1-null male mice are infertile due to sperm decapitation, while heterozygous males are fertile but show reduced sperm motility.\",\n      \"method\": \"Targeted gene disruption (knockout mouse), transmission electron microscopy, sperm motility assays\",\n      \"journal\": \"Molecular and cellular biology\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — clean knockout with defined cellular and ultrastructural phenotypes, replicated by multiple subsequent studies\",\n      \"pmids\": [\"22037768\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2014,\n      \"finding\": \"Haplo-deficiency of ODF1 in incipient congenic (129/Sv background) mice causes an enlargement of the distance between the nuclear membrane and capitulum, indicating weakening of sperm head-to-tail coupling, with severe reduction in male fecundity without detectable abnormal sperm parameters by routine semen analysis.\",\n      \"method\": \"Targeted gene disruption, successive backcrossing, ultrastructural analysis by transmission electron microscopy\",\n      \"journal\": \"Reproduction (Cambridge, England)\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — genetic (haplo-deficiency) model with ultrastructural quantification, single lab extending prior knockout study\",\n      \"pmids\": [\"25118300\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2019,\n      \"finding\": \"CCDC42 interacts with both ODF1 and ODF2 in male germ cells and localizes to the manchette, connecting piece (HTCA), and sperm tail; in somatic cells CCDC42 localizes to the centrosome, and its centrosomal/sperm tail localization appears independent of ODF1.\",\n      \"method\": \"Co-immunoprecipitation, immunofluorescence microscopy in spermatids and somatic cells\",\n      \"journal\": \"Frontiers in cell and developmental biology\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — co-IP demonstrating interaction plus subcellular localization by immunofluorescence, single lab\",\n      \"pmids\": [\"31475146\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2019,\n      \"finding\": \"ODF1 protein (and its mRNA) is expressed in rat kidney collecting ducts, demonstrating that ODF1 is not exclusively a testicular/sperm protein.\",\n      \"method\": \"Western blot, immunofluorescence, RT-PCR, proteomic analysis by mass spectrometry\",\n      \"journal\": \"Heliyon\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — four independent/orthogonal detection methods in a single focused study, single lab\",\n      \"pmids\": [\"31867458\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2022,\n      \"finding\": \"ODF1 is dispensable for the structural development of the connecting piece (which develops normally in ODF1-deficient spermatids by TEM), but is required for stable mechanical linkage of sperm head and tail; decapitation occurs when force is applied, indicating a maintenance/stabilization rather than assembly role.\",\n      \"method\": \"Transmission electron microscopy of developing spermatids from Odf1 knockout mice\",\n      \"journal\": \"International journal of molecular sciences\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — clean knockout model with ultrastructural analysis at defined developmental stages, single lab\",\n      \"pmids\": [\"36142191\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2024,\n      \"finding\": \"WDR64 (a testis-specific WD40 repeat protein) interacts with ODF1 to form a protein complex; the WDR64/ODF1 complex localizes to the manchette during nucleus shaping and to the midpiece of mature spermatozoa, implicating it in manchette and flagellum assembly.\",\n      \"method\": \"Immunoprecipitation–mass spectrometry (IP-MS), immunofluorescence microscopy\",\n      \"journal\": \"Heliyon\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Weak — IP-MS interaction plus co-localization by immunofluorescence, single lab, single method for interaction\",\n      \"pmids\": [\"39386799\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2026,\n      \"finding\": \"TENT5C poly(A) polymerase extends the poly(A) tail of Odf1 mRNA in spermatids; in the absence of TENT5C catalytic activity, Odf1 transcripts have shorter poly(A) tails, ODF1 protein fails to accumulate at the spermatid neck, and mice produce headless spermatozoa with flagellar abnormalities phenocopying ODF1 deficiency.\",\n      \"method\": \"Poly(A) tail profiling across transcriptome, Western blot, immunofluorescence localization of ODF1 protein, catalytically inactive TENT5C knock-in mouse model\",\n      \"journal\": \"Nature communications\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1–2 / Moderate — catalytic mutant knock-in with transcriptome-wide poly(A) profiling plus direct ODF1 protein localization and sperm phenotype, multiple orthogonal methods in a single rigorous study\",\n      \"pmids\": [\"42009655\"],\n      \"is_preprint\": false\n    }\n  ],\n  \"current_model\": \"ODF1/HSPB10 is a small heat shock protein that forms the structural core of sperm tail outer dense fiber medulla via leucine-zipper-mediated self-association and interactions with ODF2, SPAG4, SPAG5, CCDC42, WDR64, and OIP1 (a RING-finger E3 ligase candidate); Cdk5/p35 phosphorylates ODF1 at Ser193 to enhance ODF1–OIP1 binding, suggesting a regulated degradation pathway; translational activation of Odf1 mRNA is controlled by TENT5C-mediated poly(A) tail extension at the spermatid neck; and ODF1 is essential not for the structural assembly of the connecting piece but for the mechanical stabilization of the sperm head-to-tail linkage, with its absence causing sperm decapitation and male infertility in mice.\"\n}\n```","stage2_raw":"{\n  \"mechanistic_narrative\": \"ODF1 (HSPB10) is a spermatid-specific structural protein that forms a core component of the sperm tail outer dense fibers and mediates the mechanical coupling of the sperm head to the flagellum [#0, #10]. It self-associates through an N-terminal region containing a leucine-zipper-like motif and uses leucine zippers to nucleate a network of sperm tail interactions, binding the major outer dense fiber protein ODF2 as well as SPAG4, SPAG5, OIP1, CCDC42, and WDR64 [#2, #4, #5, #7, #8, #12, #15]. Several of these partners are recruited to or localize at the manchette and connecting piece, positioning ODF1 within the apparatus that builds and links the sperm neck and tail [#5, #12, #15]. ODF1 is post-translationally regulated: Cdk5/p35 phosphorylates ODF1 at Ser193 in its C-terminal Cys-X-Pro region, enhancing binding to the RING-finger E3 ligase candidate OIP1 [#9]. Knockout and haplo-deficiency studies establish that ODF1 is dispensable for assembling the connecting piece but is required to stabilize the head-to-tail linkage; its loss causes sperm decapitation, mitochondrial sheath and outer dense fiber disorganization, and male infertility in mice [#10, #11, #14]. Odf1 expression is controlled at multiple levels — transcriptionally by the testis-specific factor TTF-D and a CREB-like factor at its promoter [#1, #6], and translationally through storage of its mRNA in inactive ribonucleoprotein particles with later activation, including TENT5C-mediated poly(A) tail extension required for ODF1 accumulation at the spermatid neck [#3, #16].\",\n  \"teleology\": [\n    {\n      \"year\": 1990,\n      \"claim\": \"Established the molecular identity of ODF1 as a small spermatid-specific protein bearing a leucine-zipper-like N-terminal helix, framing it as a candidate structural/interaction protein of the developing sperm tail.\",\n      \"evidence\": \"Differential cDNA cloning and sequencing in rat early spermatids\",\n      \"pmids\": [\"1699827\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Subcellular localization and binding partners not yet defined\", \"Function of the leucine-zipper motif untested\"]\n    },\n    {\n      \"year\": 1992,\n      \"claim\": \"Defined how the cell-type-restricted expression of Odf1 is achieved, identifying promoter elements bound by a testis-specific factor and a CREB-like factor.\",\n      \"evidence\": \"In vitro transcription, DNase I footprinting and EMSA with seminiferous epithelium extracts\",\n      \"pmids\": [\"1731343\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Molecular identity of TTF-D not yet resolved\", \"In vivo requirement of these elements untested\"]\n    },\n    {\n      \"year\": 1994,\n      \"claim\": \"Showed that ODF1 localizes to the sperm tail and self-associates via its N-terminal half, supporting a structural role in outer dense fibers.\",\n      \"evidence\": \"Immunofluorescence and reciprocal co-IP with deletion mapping\",\n      \"pmids\": [\"7521678\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Stoichiometry and higher-order assembly unknown\", \"Single-lab data\"]\n    },\n    {\n      \"year\": 1996,\n      \"claim\": \"Revealed that ODF1 output is gated translationally, with mRNA stored in inactive RNP particles and translated during the maturation phase as ODF diameter increases.\",\n      \"evidence\": \"In situ hybridization, immunohistochemistry and polysome fractionation\",\n      \"pmids\": [\"8873064\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Molecular machinery controlling the storage-to-translation switch not identified\"]\n    },\n    {\n      \"year\": 1997,\n      \"claim\": \"Identified ODF2 as a direct leucine-zipper partner of ODF1, defining the core protein-protein contact of the outer dense fiber.\",\n      \"evidence\": \"Yeast two-hybrid with leucine-to-alanine mutagenesis and immunoelectron microscopy\",\n      \"pmids\": [\"9045620\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"In vivo assembly hierarchy of ODF1/ODF2 not established\"]\n    },\n    {\n      \"year\": 1999,\n      \"claim\": \"Expanded the ODF1 interactome with SPAG4 (manchette/axoneme) and connected the protein to candidate tail-protein transport.\",\n      \"evidence\": \"Yeast two-hybrid, co-IP and immunofluorescence\",\n      \"pmids\": [\"10373309\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Functional consequence of SPAG4 binding untested in vivo\"]\n    },\n    {\n      \"year\": 1999,\n      \"claim\": \"Characterized the DNA-binding behavior of the testis-specific factor TTF-D, showing it binds both ds and ss Odf1 promoter sites and activates transcription.\",\n      \"evidence\": \"EMSA and promoter-reporter assays with ss/ds oligonucleotide competition\",\n      \"pmids\": [\"10206985\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Identity of TTF-D peptides not cloned\", \"Mechanism of ss vs ds binding unresolved\"]\n    },\n    {\n      \"year\": 2001,\n      \"claim\": \"Added SPAG5 as a leucine-zipper ODF1 partner expressed across spermatocytes and spermatids.\",\n      \"evidence\": \"Yeast two-hybrid with deletion mutagenesis\",\n      \"pmids\": [\"11468777\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"No co-IP or localization confirmation in this study\", \"Functional role undetermined\"]\n    },\n    {\n      \"year\": 2003,\n      \"claim\": \"Linked ODF1 to a potential ubiquitin-mediated regulatory pathway by identifying the RING-finger protein OIP1 binding ODF1's conserved C-terminal Cys-Gly-Pro repeats.\",\n      \"evidence\": \"Yeast two-hybrid, deletion mutagenesis and immunofluorescence\",\n      \"pmids\": [\"12533418\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"E3 ligase activity of OIP1 toward ODF1 not demonstrated\", \"No degradation assay\"]\n    },\n    {\n      \"year\": 2007,\n      \"claim\": \"Connected a kinase signal to the ODF1-OIP1 axis, showing Cdk5/p35 phosphorylates ODF1 at Ser193 to enhance OIP1 binding, implying regulated turnover.\",\n      \"evidence\": \"In vitro kinase assay, mass spectrometry phosphosite mapping, phospho-mutant binding assays\",\n      \"pmids\": [\"17762160\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Functional consequence of phospho-enhanced OIP1 binding in vivo not shown\", \"ODF1 ubiquitination/degradation not directly demonstrated\"]\n    },\n    {\n      \"year\": 2011,\n      \"claim\": \"Established ODF1's essential physiological role: it is required for tight head-to-tail linkage and proper mitochondrial sheath/ODF organization, with knockout males infertile from decapitation.\",\n      \"evidence\": \"Knockout mouse, transmission electron microscopy, motility assays\",\n      \"pmids\": [\"22037768\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Molecular basis of mechanical coupling not resolved\", \"Whether defect is assembly or maintenance unclear at this stage\"]\n    },\n    {\n      \"year\": 2014,\n      \"claim\": \"Demonstrated dose sensitivity of the linkage, with haplo-deficiency widening the nuclear membrane-to-capitulum distance and reducing fecundity despite normal routine semen parameters.\",\n      \"evidence\": \"Targeted disruption with backcrossing and ultrastructural analysis\",\n      \"pmids\": [\"25118300\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Single genetic background\", \"Mechanism linking ODF1 dosage to coupling strength unknown\"]\n    },\n    {\n      \"year\": 2019,\n      \"claim\": \"Placed ODF1 in a connecting-piece/manchette network by showing CCDC42 binds both ODF1 and ODF2 yet localizes independently of ODF1.\",\n      \"evidence\": \"Co-IP and immunofluorescence in germ and somatic cells\",\n      \"pmids\": [\"31475146\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Functional interdependence of CCDC42 and ODF1 not tested\"]\n    },\n    {\n      \"year\": 2019,\n      \"claim\": \"Challenged the strict testis-exclusivity of ODF1 by detecting it in rat kidney collecting ducts.\",\n      \"evidence\": \"Western blot, immunofluorescence, RT-PCR, mass spectrometry\",\n      \"pmids\": [\"31867458\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Function of ODF1 in kidney unknown\", \"Not confirmed in other species\"]\n    },\n    {\n      \"year\": 2022,\n      \"claim\": \"Resolved the assembly-versus-maintenance question, showing the connecting piece forms normally without ODF1 but fails mechanically under force, defining ODF1 as a stabilizer rather than a builder.\",\n      \"evidence\": \"TEM of developing spermatids from knockout mice\",\n      \"pmids\": [\"36142191\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Molecular nature of the stabilizing interaction unidentified\"]\n    },\n    {\n      \"year\": 2024,\n      \"claim\": \"Added WDR64 as an ODF1 complex partner spanning the manchette and midpiece, implicating the complex in nucleus shaping and flagellum assembly.\",\n      \"evidence\": \"IP-MS and immunofluorescence co-localization\",\n      \"pmids\": [\"39386799\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Single method for interaction\", \"In vivo requirement of WDR64-ODF1 complex untested\"]\n    },\n    {\n      \"year\": 2026,\n      \"claim\": \"Defined an upstream translational control mechanism: TENT5C-mediated poly(A) extension of Odf1 mRNA is required for ODF1 accumulation at the spermatid neck, with loss phenocopying ODF1 deficiency.\",\n      \"evidence\": \"Catalytically inactive TENT5C knock-in mouse, transcriptome poly(A) profiling, Western blot and immunofluorescence\",\n      \"pmids\": [\"42009655\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"How TENT5C is targeted specifically to Odf1 mRNA unknown\", \"Direct vs indirect effect on ODF1 not fully separated\"]\n    },\n    {\n      \"year\": null,\n      \"claim\": \"It remains unknown whether the Cdk5/OIP1 phosphorylation-degradation model operates in vivo, and what molecular interaction physically transmits the stabilizing force at the head-tail junction.\",\n      \"evidence\": \"No timeline study directly demonstrates ODF1 ubiquitination/turnover in vivo or the biophysical basis of head-tail coupling\",\n      \"pmids\": [],\n      \"confidence\": \"Low\",\n      \"gaps\": [\"No in vivo demonstration of OIP1-mediated ODF1 degradation\", \"Biophysical mechanism of mechanical stabilization unresolved\", \"Function of non-testicular ODF1 unaddressed\"]\n    }\n  ],\n  \"mechanism_profile\": {\n    \"molecular_activity\": [\n      {\"term_id\": \"GO:0005198\", \"supporting_discovery_ids\": [2, 4, 10]},\n      {\"term_id\": \"GO:0042393\", \"supporting_discovery_ids\": []}\n    ],\n    \"localization\": [\n      {\"term_id\": \"GO:0005856\", \"supporting_discovery_ids\": [2, 10]},\n      {\"term_id\": \"GO:0005815\", \"supporting_discovery_ids\": [12]}\n    ],\n    \"pathway\": [\n      {\"term_id\": \"R-HSA-1474165\", \"supporting_discovery_ids\": [10, 16]}\n    ],\n    \"complexes\": [\"sperm tail outer dense fibers\", \"WDR64/ODF1 complex\"],\n    \"partners\": [\"ODF2\", \"SPAG4\", \"SPAG5\", \"OIP1\", \"CCDC42\", \"WDR64\", \"CDK5\"],\n    \"other_free_text\": []\n  }\n}","audit_flag":null,"evaluation":{"pairwise":"win","faith_supported":6,"faith_total":6,"faith_pct":100.0}}