{"gene":"ODF4","run_date":"2026-06-10T05:19:52","timeline":{"discoveries":[{"year":2023,"finding":"ODF4 physically associates with adenylate kinases AK1 and AK2 in mouse spermatozoa, as demonstrated by co-immunoprecipitation. ODF4 localizes to whole flagella (plasmalemma, mitochondria, outer dense fibers, and residual cytoplasmic droplets), while AK1 localizes to principal pieces and AK2 to midpieces. Deletion of Odf4 reduces AK1 and AK2 levels in flagella, causes a hairpin flagellum with a large cytoplasmic droplet in the midpiece, abolishes midpiece motility while retaining principal-piece motility, and renders males infertile. These defects were reversed by Odf4 restoration in a rescue experiment.","method":"Co-immunoprecipitation, immunofluorescence localization, Odf4 knockout mouse model, sperm motility analysis, rescue (transgenic restoration), fertility assay","journal":"Scientific reports","confidence":"High","confidence_rationale":"Tier 2 / Strong — reciprocal Co-IP, clean KO with defined cellular and fertility phenotype, genetic rescue experiment confirming causality, multiple orthogonal methods in a single rigorous study","pmids":["36804949"],"is_preprint":false},{"year":2024,"finding":"In vitro, Odf4-/- spermatozoa with hairpin flagella can undergo capacitation (detected by anti-phosphotyrosine immunoblot), shed approximately 30% of large cytoplasmic droplets, straighten their flagella, swim forward, and fertilize wild-type oocytes that develop into zygotes — demonstrating that ODF4 is dispensable for fertilization competence under IVF conditions despite being required for in vivo fertility.","method":"In vitro fertilization assay, immunoblotting (anti-pTyr capacitation marker), computer-assisted sperm motility analysis (SMAS), high-speed videomicroscopy","journal":"Reproductive medicine and biology","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — clean KO model with multiple orthogonal functional readouts (capacitation, motility, fertilization), single lab, extends prior study","pmids":["39314832"],"is_preprint":false},{"year":2004,"finding":"Human OPPO1 (ODF4) encodes a 257 amino acid protein whose mRNA expression is predominantly restricted to the testis, as determined by RT-PCR across multiple tissues, suggesting a role in spermatogenesis.","method":"RT-PCR tissue expression panel, RACE, cDNA cloning and sequencing","journal":"Journal of assisted reproduction and genetics","confidence":"Low","confidence_rationale":"Tier 3 / Weak — single lab, expression characterization only with no direct functional experiment on the protein","pmids":["15270212"],"is_preprint":false},{"year":2012,"finding":"Two alternative splice variants of ODF4 were identified by cDNA cloning from human testis tissue of a prostate cancer patient, indicating that ODF4 pre-mRNA undergoes alternative splicing.","method":"RT-PCR, cDNA cloning and sequencing","journal":"Genetics and molecular research : GMR","confidence":"Low","confidence_rationale":"Tier 3 / Weak — single lab, single method (sequencing), no functional characterization of variants","pmids":["23096689"],"is_preprint":false},{"year":2012,"finding":"Increased expression of the T3-negatively-regulated gene Odf4 was observed in cerebellar tissue of thimerosal-exposed rat pups coinciding with decreased type-2 deiodinase activity, suggesting Odf4 is negatively regulated by thyroid hormone T3 in the cerebellum; however, this was correlative and not directly tested mechanistically.","method":"Gene expression analysis in rat cerebellum combined with enzymatic activity assay (type-2 deiodinase)","journal":"Cerebellum (London, England)","confidence":"Low","confidence_rationale":"Tier 4 / Weak — expression correlation in a rat model, no direct mechanistic experiment on ODF4 protein or its regulation by T3","pmids":["22015705"],"is_preprint":false}],"current_model":"ODF4 is a testis-enriched outer dense fiber protein that physically interacts with adenylate kinases AK1 and AK2 in sperm flagella; loss of ODF4 in mice reduces flagellar AK1/AK2 levels, causes hairpin flagellar morphology with enlarged cytoplasmic droplets, abolishes midpiece motility, and leads to male infertility that is rescued by ODF4 restoration, establishing ODF4 as essential for proper flagellar shape and movement through its association with adenylate kinase-mediated ATP shuttling."},"narrative":{"mechanistic_narrative":"ODF4 is a testis-enriched outer dense fiber protein essential for normal sperm flagellar shape and movement [PMID:36804949, PMID:15270212]. It distributes throughout the flagellum—across the plasmalemma, mitochondria, outer dense fibers, and residual cytoplasmic droplets—and physically associates with the adenylate kinases AK1 and AK2 [PMID:36804949]. Through this association ODF4 maintains flagellar AK1 and AK2 levels: loss of Odf4 in mice depletes both kinases from the flagellum, produces hairpin flagella bearing an enlarged midpiece cytoplasmic droplet, abolishes midpiece motility while sparing principal-piece motility, and causes male infertility that is reversed by Odf4 restoration [PMID:36804949]. Despite this in vivo requirement, ODF4-null spermatozoa retain fertilization competence under IVF conditions, where they can capacitate, shed cytoplasmic droplets, straighten their flagella, and fertilize oocytes [PMID:39314832], indicating that ODF4's essential role is in supporting flagellar structure and motility for in vivo fertility rather than in the fertilization reaction itself. Beyond this flagellar function, no further mechanistic detail has been characterized in the available corpus.","teleology":[{"year":2004,"claim":"Established ODF4 as a testis-predominant gene product, placing it within spermatogenesis before any function was known.","evidence":"RT-PCR tissue expression panel, RACE, and cDNA cloning of human OPPO1/ODF4","pmids":["15270212"],"confidence":"Low","gaps":["Expression characterization only with no direct functional experiment on the protein","No subcellular localization within sperm established","No protein-level interaction data"]},{"year":2012,"claim":"Showed ODF4 pre-mRNA undergoes alternative splicing in human testis, raising the possibility of isoform diversity.","evidence":"RT-PCR and cDNA cloning of two splice variants from human testis tissue","pmids":["23096689"],"confidence":"Low","gaps":["No functional characterization of the variants","Protein-level consequences of the isoforms unknown"]},{"year":2012,"claim":"Correlated Odf4 expression with thyroid hormone signaling in rat cerebellum, hinting at regulation outside the testis, though not tested mechanistically.","evidence":"Gene expression analysis and type-2 deiodinase activity assay in thimerosal-exposed rat cerebellum","pmids":["22015705"],"confidence":"Low","gaps":["Correlative only; no direct mechanistic test of T3 regulation of ODF4","No demonstration of ODF4 protein function in brain","Relationship to testis function unclear"]},{"year":2023,"claim":"Defined ODF4's molecular function by linking it to adenylate kinases and demonstrating that its loss disrupts flagellar shape, motility, and fertility, with genetic rescue confirming causality.","evidence":"Co-immunoprecipitation, immunofluorescence, Odf4 knockout and transgenic-rescue mouse model, sperm motility and fertility assays","pmids":["36804949"],"confidence":"High","gaps":["Whether ODF4 directly binds AK1/AK2 or recruits them via intermediates is not resolved","Structural basis of the ODF4–adenylate kinase association unknown","Mechanism connecting ATP shuttling to midpiece motility not directly demonstrated"]},{"year":2024,"claim":"Distinguished ODF4's in vivo requirement from fertilization competence by showing null sperm can still fertilize under IVF conditions.","evidence":"In vitro fertilization assay, anti-phosphotyrosine capacitation immunoblot, computer-assisted motility analysis, and high-speed videomicroscopy of Odf4-/- sperm","pmids":["39314832"],"confidence":"Medium","gaps":["Single lab extending prior study","Why droplet shedding and flagellar straightening occur in vitro but fail in vivo is unexplained","Molecular trigger of in vitro flagellar straightening not identified"]},{"year":null,"claim":"The direct biochemical mechanism by which ODF4 stabilizes flagellar adenylate kinases and translates this into proper midpiece motility remains unresolved.","evidence":"","pmids":[],"confidence":"High","gaps":["No structural model of ODF4 or its interaction interfaces","Direct versus indirect interaction with AK1/AK2 untested","No reported human disease association"]}],"mechanism_profile":{"molecular_activity":[{"term_id":"GO:0005198","term_label":"structural molecule activity","supporting_discovery_ids":[0]}],"localization":[{"term_id":"GO:0005856","term_label":"cytoskeleton","supporting_discovery_ids":[0]},{"term_id":"GO:0005739","term_label":"mitochondrion","supporting_discovery_ids":[0]},{"term_id":"GO:0005886","term_label":"plasma membrane","supporting_discovery_ids":[0]}],"pathway":[{"term_id":"R-HSA-1474165","term_label":"Reproduction","supporting_discovery_ids":[0,1]}],"complexes":[],"partners":["AK1","AK2"],"other_free_text":[]}},"prefetch_data":{"uniprot":{"accession":"Q2M2E3","full_name":"Outer dense fiber protein 4","aliases":["Outer dense fiber of sperm tails protein 4","Testis-specific protein oppo 1","hOPPO1"],"length_aa":257,"mass_kda":29.2,"function":"Component of the outer dense fibers (ODF) of spermatozoa which could be involved in sperm tail structure, sperm movement and general organization of cellular cytoskeleton","subcellular_location":"Membrane","url":"https://www.uniprot.org/uniprotkb/Q2M2E3/entry"},"depmap":{"release":"DepMap","has_data":true,"is_common_essential":false,"resolved_as":"","url":"https://depmap.org/portal/gene/ODF4","classification":"Not Classified","n_dependent_lines":4,"n_total_lines":1208,"dependency_fraction":0.0033112582781456954},"opencell":{"profiled":false,"resolved_as":"","ensg_id":"","cell_line_id":"","localizations":[],"interactors":[],"url":"https://opencell.sf.czbiohub.org/search/ODF4","total_profiled":1310},"omim":[{"mim_id":"610097","title":"OUTER DENSE FIBER OF SPERM TAILS 4; ODF4","url":"https://www.omim.org/entry/610097"}],"hpa":{"profiled":true,"resolved_as":"","reliability":"Approved","locations":[{"location":"Principal piece","reliability":"Approved"}],"tissue_specificity":"Tissue enriched","tissue_distribution":"Detected in single","driving_tissues":[{"tissue":"testis","ntpm":12.3}],"url":"https://www.proteinatlas.org/search/ODF4"},"hgnc":{"alias_symbol":["OPPO1","CT136"],"prev_symbol":[]},"alphafold":{"accession":"Q2M2E3","domains":[{"cath_id":"1.20.5","chopping":"74-110","consensus_level":"medium","plddt":63.1032,"start":74,"end":110},{"cath_id":"1.20.5","chopping":"176-213","consensus_level":"medium","plddt":65.8334,"start":176,"end":213}],"viewer_url":"https://alphafold.ebi.ac.uk/entry/Q2M2E3","model_url":"https://alphafold.ebi.ac.uk/files/AF-Q2M2E3-F1-model_v6.cif","pae_url":"https://alphafold.ebi.ac.uk/files/AF-Q2M2E3-F1-predicted_aligned_error_v6.png","plddt_mean":55.22},"mouse_models":{"mgi_url":"https://www.informatics.jax.org/marker/summary?nomen=ODF4","jax_strain_url":"https://www.jax.org/strain/search?query=ODF4"},"sequence":{"accession":"Q2M2E3","fasta_url":"https://rest.uniprot.org/uniprotkb/Q2M2E3.fasta","uniprot_url":"https://www.uniprot.org/uniprotkb/Q2M2E3/entry","alphafold_viewer_url":"https://alphafold.ebi.ac.uk/entry/Q2M2E3"}},"corpus_meta":[{"pmid":"20682177","id":"PMC_20682177","title":"Expression of two testis-specific genes, SPATA19 and LEMD1, in prostate cancer.","date":"2010","source":"Archives of medical research","url":"https://pubmed.ncbi.nlm.nih.gov/20682177","citation_count":56,"is_preprint":false},{"pmid":"24935380","id":"PMC_24935380","title":"Lactobacillus acidophilus and Lactobacillus crispatus culture supernatants downregulate expression of cancer-testis genes in the MDA-MB-231 cell line.","date":"2014","source":"Asian Pacific journal of cancer prevention : APJCP","url":"https://pubmed.ncbi.nlm.nih.gov/24935380","citation_count":43,"is_preprint":false},{"pmid":"26464818","id":"PMC_26464818","title":"Upregulation of RHOXF2 and ODF4 Expression in Breast Cancer Tissues.","date":"2015","source":"Cell journal","url":"https://pubmed.ncbi.nlm.nih.gov/26464818","citation_count":29,"is_preprint":false},{"pmid":"22015705","id":"PMC_22015705","title":"Maternal thimerosal exposure results in aberrant cerebellar oxidative stress, thyroid hormone metabolism, and motor behavior in rat pups; sex- and strain-dependent effects.","date":"2012","source":"Cerebellum (London, England)","url":"https://pubmed.ncbi.nlm.nih.gov/22015705","citation_count":29,"is_preprint":false},{"pmid":"22588436","id":"PMC_22588436","title":"Expression of testis-specific genes, TEX101 and ODF4, in chronic myeloid leukemia and evaluation of TEX101 immunogenicity.","date":"2012","source":"Annals of Saudi medicine","url":"https://pubmed.ncbi.nlm.nih.gov/22588436","citation_count":24,"is_preprint":false},{"pmid":"29058301","id":"PMC_29058301","title":"Cancer-Testis Antigens as New Candidate Diagnostic Biomarkers for Transitional Cell Carcinoma of Bladder.","date":"2017","source":"Pathology oncology research : POR","url":"https://pubmed.ncbi.nlm.nih.gov/29058301","citation_count":19,"is_preprint":false},{"pmid":"23096689","id":"PMC_23096689","title":"Expression of splice variants of cancer-testis genes ODF3 and ODF4 in the testis of a prostate cancer patient.","date":"2012","source":"Genetics and molecular research : GMR","url":"https://pubmed.ncbi.nlm.nih.gov/23096689","citation_count":15,"is_preprint":false},{"pmid":"36804949","id":"PMC_36804949","title":"The association of ODF4 with AK1 and AK2 in mice is essential for fertility through its contribution to flagellar shape.","date":"2023","source":"Scientific reports","url":"https://pubmed.ncbi.nlm.nih.gov/36804949","citation_count":7,"is_preprint":false},{"pmid":"15270212","id":"PMC_15270212","title":"Isolation and expression analysis of the testis-specific gene, human OPPO1.","date":"2004","source":"Journal of assisted reproduction and genetics","url":"https://pubmed.ncbi.nlm.nih.gov/15270212","citation_count":4,"is_preprint":false},{"pmid":"28865418","id":"PMC_28865418","title":"ODF4, MAGEA3, and MAGEB4: Potential Biomarkers in Patients with Transitional Cell Carcinoma.","date":"2017","source":"Iranian biomedical journal","url":"https://pubmed.ncbi.nlm.nih.gov/28865418","citation_count":3,"is_preprint":false},{"pmid":"31831960","id":"PMC_31831960","title":"Detection and analysis of stable and flexible genes towards a genome signature framework in cancer.","date":"2019","source":"Bioinformation","url":"https://pubmed.ncbi.nlm.nih.gov/31831960","citation_count":1,"is_preprint":false},{"pmid":"39314832","id":"PMC_39314832","title":"Spermatozoa from male mice with infertility due to Odf4 deficiency can fertilize oocytes by in vitro fertilization.","date":"2024","source":"Reproductive medicine and biology","url":"https://pubmed.ncbi.nlm.nih.gov/39314832","citation_count":0,"is_preprint":false}],"cost":{"stage1":{"model":"claude-sonnet-4-6","input_tokens":7705,"output_tokens":1326,"usd":0.021503,"stage1_stop_reason":"end_turn"},"stage2":{"model":"claude-opus-4-8","input_tokens":8020,"output_tokens":2030,"usd":0.045425,"stage2_stop_reason":"end_turn"},"total_usd":0.066928,"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\": 2023,\n      \"finding\": \"ODF4 physically associates with adenylate kinases AK1 and AK2 in mouse spermatozoa, as demonstrated by co-immunoprecipitation. ODF4 localizes to whole flagella (plasmalemma, mitochondria, outer dense fibers, and residual cytoplasmic droplets), while AK1 localizes to principal pieces and AK2 to midpieces. Deletion of Odf4 reduces AK1 and AK2 levels in flagella, causes a hairpin flagellum with a large cytoplasmic droplet in the midpiece, abolishes midpiece motility while retaining principal-piece motility, and renders males infertile. These defects were reversed by Odf4 restoration in a rescue experiment.\",\n      \"method\": \"Co-immunoprecipitation, immunofluorescence localization, Odf4 knockout mouse model, sperm motility analysis, rescue (transgenic restoration), fertility assay\",\n      \"journal\": \"Scientific reports\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — reciprocal Co-IP, clean KO with defined cellular and fertility phenotype, genetic rescue experiment confirming causality, multiple orthogonal methods in a single rigorous study\",\n      \"pmids\": [\"36804949\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2024,\n      \"finding\": \"In vitro, Odf4-/- spermatozoa with hairpin flagella can undergo capacitation (detected by anti-phosphotyrosine immunoblot), shed approximately 30% of large cytoplasmic droplets, straighten their flagella, swim forward, and fertilize wild-type oocytes that develop into zygotes — demonstrating that ODF4 is dispensable for fertilization competence under IVF conditions despite being required for in vivo fertility.\",\n      \"method\": \"In vitro fertilization assay, immunoblotting (anti-pTyr capacitation marker), computer-assisted sperm motility analysis (SMAS), high-speed videomicroscopy\",\n      \"journal\": \"Reproductive medicine and biology\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — clean KO model with multiple orthogonal functional readouts (capacitation, motility, fertilization), single lab, extends prior study\",\n      \"pmids\": [\"39314832\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2004,\n      \"finding\": \"Human OPPO1 (ODF4) encodes a 257 amino acid protein whose mRNA expression is predominantly restricted to the testis, as determined by RT-PCR across multiple tissues, suggesting a role in spermatogenesis.\",\n      \"method\": \"RT-PCR tissue expression panel, RACE, cDNA cloning and sequencing\",\n      \"journal\": \"Journal of assisted reproduction and genetics\",\n      \"confidence\": \"Low\",\n      \"confidence_rationale\": \"Tier 3 / Weak — single lab, expression characterization only with no direct functional experiment on the protein\",\n      \"pmids\": [\"15270212\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2012,\n      \"finding\": \"Two alternative splice variants of ODF4 were identified by cDNA cloning from human testis tissue of a prostate cancer patient, indicating that ODF4 pre-mRNA undergoes alternative splicing.\",\n      \"method\": \"RT-PCR, cDNA cloning and sequencing\",\n      \"journal\": \"Genetics and molecular research : GMR\",\n      \"confidence\": \"Low\",\n      \"confidence_rationale\": \"Tier 3 / Weak — single lab, single method (sequencing), no functional characterization of variants\",\n      \"pmids\": [\"23096689\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2012,\n      \"finding\": \"Increased expression of the T3-negatively-regulated gene Odf4 was observed in cerebellar tissue of thimerosal-exposed rat pups coinciding with decreased type-2 deiodinase activity, suggesting Odf4 is negatively regulated by thyroid hormone T3 in the cerebellum; however, this was correlative and not directly tested mechanistically.\",\n      \"method\": \"Gene expression analysis in rat cerebellum combined with enzymatic activity assay (type-2 deiodinase)\",\n      \"journal\": \"Cerebellum (London, England)\",\n      \"confidence\": \"Low\",\n      \"confidence_rationale\": \"Tier 4 / Weak — expression correlation in a rat model, no direct mechanistic experiment on ODF4 protein or its regulation by T3\",\n      \"pmids\": [\"22015705\"],\n      \"is_preprint\": false\n    }\n  ],\n  \"current_model\": \"ODF4 is a testis-enriched outer dense fiber protein that physically interacts with adenylate kinases AK1 and AK2 in sperm flagella; loss of ODF4 in mice reduces flagellar AK1/AK2 levels, causes hairpin flagellar morphology with enlarged cytoplasmic droplets, abolishes midpiece motility, and leads to male infertility that is rescued by ODF4 restoration, establishing ODF4 as essential for proper flagellar shape and movement through its association with adenylate kinase-mediated ATP shuttling.\"\n}\n```","stage2_raw":"{\n  \"mechanistic_narrative\": \"ODF4 is a testis-enriched outer dense fiber protein essential for normal sperm flagellar shape and movement [#0, #2]. It distributes throughout the flagellum—across the plasmalemma, mitochondria, outer dense fibers, and residual cytoplasmic droplets—and physically associates with the adenylate kinases AK1 and AK2 [#0]. Through this association ODF4 maintains flagellar AK1 and AK2 levels: loss of Odf4 in mice depletes both kinases from the flagellum, produces hairpin flagella bearing an enlarged midpiece cytoplasmic droplet, abolishes midpiece motility while sparing principal-piece motility, and causes male infertility that is reversed by Odf4 restoration [#0]. Despite this in vivo requirement, ODF4-null spermatozoa retain fertilization competence under IVF conditions, where they can capacitate, shed cytoplasmic droplets, straighten their flagella, and fertilize oocytes [#1], indicating that ODF4's essential role is in supporting flagellar structure and motility for in vivo fertility rather than in the fertilization reaction itself. Beyond this flagellar function, no further mechanistic detail has been characterized in the available corpus.\",\n  \"teleology\": [\n    {\n      \"year\": 2004,\n      \"claim\": \"Established ODF4 as a testis-predominant gene product, placing it within spermatogenesis before any function was known.\",\n      \"evidence\": \"RT-PCR tissue expression panel, RACE, and cDNA cloning of human OPPO1/ODF4\",\n      \"pmids\": [\"15270212\"],\n      \"confidence\": \"Low\",\n      \"gaps\": [\n        \"Expression characterization only with no direct functional experiment on the protein\",\n        \"No subcellular localization within sperm established\",\n        \"No protein-level interaction data\"\n      ]\n    },\n    {\n      \"year\": 2012,\n      \"claim\": \"Showed ODF4 pre-mRNA undergoes alternative splicing in human testis, raising the possibility of isoform diversity.\",\n      \"evidence\": \"RT-PCR and cDNA cloning of two splice variants from human testis tissue\",\n      \"pmids\": [\"23096689\"],\n      \"confidence\": \"Low\",\n      \"gaps\": [\n        \"No functional characterization of the variants\",\n        \"Protein-level consequences of the isoforms unknown\"\n      ]\n    },\n    {\n      \"year\": 2012,\n      \"claim\": \"Correlated Odf4 expression with thyroid hormone signaling in rat cerebellum, hinting at regulation outside the testis, though not tested mechanistically.\",\n      \"evidence\": \"Gene expression analysis and type-2 deiodinase activity assay in thimerosal-exposed rat cerebellum\",\n      \"pmids\": [\"22015705\"],\n      \"confidence\": \"Low\",\n      \"gaps\": [\n        \"Correlative only; no direct mechanistic test of T3 regulation of ODF4\",\n        \"No demonstration of ODF4 protein function in brain\",\n        \"Relationship to testis function unclear\"\n      ]\n    },\n    {\n      \"year\": 2023,\n      \"claim\": \"Defined ODF4's molecular function by linking it to adenylate kinases and demonstrating that its loss disrupts flagellar shape, motility, and fertility, with genetic rescue confirming causality.\",\n      \"evidence\": \"Co-immunoprecipitation, immunofluorescence, Odf4 knockout and transgenic-rescue mouse model, sperm motility and fertility assays\",\n      \"pmids\": [\"36804949\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\n        \"Whether ODF4 directly binds AK1/AK2 or recruits them via intermediates is not resolved\",\n        \"Structural basis of the ODF4–adenylate kinase association unknown\",\n        \"Mechanism connecting ATP shuttling to midpiece motility not directly demonstrated\"\n      ]\n    },\n    {\n      \"year\": 2024,\n      \"claim\": \"Distinguished ODF4's in vivo requirement from fertilization competence by showing null sperm can still fertilize under IVF conditions.\",\n      \"evidence\": \"In vitro fertilization assay, anti-phosphotyrosine capacitation immunoblot, computer-assisted motility analysis, and high-speed videomicroscopy of Odf4-/- sperm\",\n      \"pmids\": [\"39314832\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\n        \"Single lab extending prior study\",\n        \"Why droplet shedding and flagellar straightening occur in vitro but fail in vivo is unexplained\",\n        \"Molecular trigger of in vitro flagellar straightening not identified\"\n      ]\n    },\n    {\n      \"year\": null,\n      \"claim\": \"The direct biochemical mechanism by which ODF4 stabilizes flagellar adenylate kinases and translates this into proper midpiece motility remains unresolved.\",\n      \"evidence\": \"\",\n      \"pmids\": [],\n      \"confidence\": \"High\",\n      \"gaps\": [\n        \"No structural model of ODF4 or its interaction interfaces\",\n        \"Direct versus indirect interaction with AK1/AK2 untested\",\n        \"No reported human disease association\"\n      ]\n    }\n  ],\n  \"mechanism_profile\": {\n    \"molecular_activity\": [\n      {\"term_id\": \"GO:0005198\", \"supporting_discovery_ids\": [0]}\n    ],\n    \"localization\": [\n      {\"term_id\": \"GO:0005856\", \"supporting_discovery_ids\": [0]},\n      {\"term_id\": \"GO:0005739\", \"supporting_discovery_ids\": [0]},\n      {\"term_id\": \"GO:0005886\", \"supporting_discovery_ids\": [0]}\n    ],\n    \"pathway\": [\n      {\"term_id\": \"R-HSA-1474165\", \"supporting_discovery_ids\": [0, 1]}\n    ],\n    \"complexes\": [],\n    \"partners\": [\"AK1\", \"AK2\"],\n    \"other_free_text\": []\n  }\n}","audit_flag":null,"evaluation":{"pairwise":"win","faith_supported":4,"faith_total":4,"faith_pct":100.0}}