{"gene":"DNAH12","run_date":"2026-06-09T23:54:42","timeline":{"discoveries":[{"year":2024,"finding":"DNAH12 physically interacts with inner dynein arm (IDA) components DNALI1 and DNAH1; loss of DNAH12 causes failed recruitment of DNALI1 and DNAH1 to IDAs in sperm flagella, impairing IDA assembly.","method":"Co-immunoprecipitation (interaction), Dnah12 knockout and Dnah12 mut/mut mouse models with transmission electron microscopy (TEM) showing IDA defects, immunofluorescence showing loss of DNALI1 and DNAH1 from flagella","journal":"bioRxiv","confidence":"High","confidence_rationale":"Tier 2 / Strong — reciprocal interaction confirmed, genetic knockout models in mice with defined ultrastructural phenotype, multiple orthogonal methods (WES, TEM, IF, mouse KO) in a single rigorous study","pmids":[],"is_preprint":true},{"year":2024,"finding":"DNAH12 interacts with radial spoke head proteins RSPH1, RSPH9, and DNAJB13, and its deficiency leads to central pair (CP) loss in sperm flagella, indicating DNAH12 regulates central pair stability via these interactions.","method":"Co-immunoprecipitation (interaction), Dnah12 knockout mouse TEM showing central pair loss","journal":"bioRxiv","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — interactions confirmed by Co-IP and functional consequence shown by TEM in KO mice, single lab/study","pmids":[],"is_preprint":true},{"year":2024,"finding":"DNAH12 deficiency does not affect cilium organization or function; its role is specific to sperm flagella axoneme assembly.","method":"Dnah12 knockout mouse model with assessment of ciliary function (negative result for ciliary phenotype)","journal":"bioRxiv","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — clean KO mouse model with specific functional readout (cilia unaffected), single lab; negative finding mechanistically informative for tissue specificity","pmids":[],"is_preprint":true},{"year":2024,"finding":"Biallelic loss-of-function variants in DNAH12 cause severe asthenoteratozoospermia with pronounced axonemal abnormalities (IDA impairment and central pair loss) in human sperm flagella, confirmed in Dnah12 knockout mice.","method":"Whole-exome sequencing + Sanger sequencing in six families, TEM of patient sperm, Dnah12 knockout and knock-in mouse models recapitulating infertility phenotype","journal":"bioRxiv","confidence":"High","confidence_rationale":"Tier 2 / Strong — genetic evidence from multiple families co-segregating with phenotype, TEM ultrastructural validation, mouse KO recapitulation; multiple orthogonal methods","pmids":[],"is_preprint":true},{"year":2024,"finding":"Infertility caused by DNAH12 deficiency (Dnah12 knockout mice) can be rescued by intracytoplasmic sperm injection (ICSI), establishing the functional consequence is limited to natural fertilization competence.","method":"ICSI in Dnah12 knockout mice and human patients with DNAH12 variants","journal":"iScience","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — direct functional rescue experiment in mouse KO model and human patients, single lab, two independent datasets (human and mouse)","pmids":["39071892"],"is_preprint":false},{"year":2024,"finding":"Biallelic deleterious variants in DNAH12 cause severe asthenozoospermia with abnormal sperm flagella morphology and structure in humans, and Dnah12 knockout mice recapitulate the male infertility phenotype with spermatogenesis failure.","method":"Whole-exome sequencing of infertile men, semen analysis, Dnah12 knockout mouse model","journal":"iScience","confidence":"High","confidence_rationale":"Tier 2 / Strong — genetic variants identified in human patients, mouse KO independently validates causal relationship; replicated across two studies (iScience and preprint)","pmids":["39071892"],"is_preprint":false},{"year":2025,"finding":"DNAH12 deficiency causes significant downregulation of inner dynein arm components DNAH7 and DNAH12 in the context of radial spoke 1 (RS1) defects, highlighting the nearby structural relationship between RS1 and these IDA components in sperm flagella.","method":"Iqub knockout mouse model with protein mass spectrometry and western blotting identifying reduced DNAH7 and DNAH12 levels","journal":"Cell communication and signaling : CCS","confidence":"Low","confidence_rationale":"Tier 3 / Weak — DNAH12 reduced as a consequence of another gene's KO (IQUB), not a direct experiment on DNAH12 itself; single method inference about DNAH12 localization near RS1","pmids":["39849482"],"is_preprint":false},{"year":2020,"finding":"DNAH12 (DHC3) and DHC4 in Chlamydomonas localize preferentially to the proximal ~2 µm region of the flagellum (proximal flagellar axoneme), as demonstrated by analyses of growing flagella; this region has a distinct dynein composition from the rest of the axoneme.","method":"Immunofluorescence microscopy of Chlamydomonas flagella; analysis of growing flagella to track dynein localization","journal":"Journal of cell science","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — direct immunofluorescence localization experiment in Chlamydomonas with ortholog DHC3/DHC4; single lab, single method but clear functional localization data","pmids":["19351714"],"is_preprint":false},{"year":2020,"finding":"In Chlamydomonas, FAP57/CFAP57 is required for proper incorporation of 'g' inner dyneins (DHC7 and DHC3, the ortholog of DNAH12) into the axoneme; loss of FAP57 causes reduction of DHC3 (DNAH12 ortholog) in the axoneme.","method":"Tandem mass tag (TMT) mass spectrometry of Chlamydomonas fap57 mutant axonemes showing reduced DHC3/DHC7","journal":"PLoS genetics","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — mass spectrometry of KO axoneme in Chlamydomonas ortholog system; single lab but quantitative proteomic method directly measuring DHC3 reduction","pmids":["32764743"],"is_preprint":false},{"year":2014,"finding":"The VE1 antibody cross-reacts with epitopes in DNAH12 (among other axonemal dynein heavy chains); ELISA assays confirmed VE1 recognizes epitopes from DNAH12, establishing that DNAH12 protein is present in cilia and flagella of multiple human tissues.","method":"ELISA assay showing VE1 antibody binding to DNAH12 epitopes; sequence homology analysis identifying the cross-reactive epitope","journal":"Modern pathology","confidence":"Low","confidence_rationale":"Tier 3 / Weak — ELISA epitope recognition is indirect localization evidence; establishes axonemal presence but by cross-reactivity rather than dedicated DNAH12 experiment","pmids":["25412847"],"is_preprint":false}],"current_model":"DNAH12 is an axonemal dynein heavy chain that lacks a microtubule-binding domain and plays a critical, flagella-specific role in sperm axoneme assembly: it physically interacts with inner dynein arm (IDA) components DNALI1 and DNAH1 and is required for their recruitment to IDAs, and also interacts with radial spoke head proteins RSPH1, RSPH9, and DNAJB13 to stabilize the central pair apparatus; biallelic loss-of-function mutations in humans and Dnah12 knockout mice cause severe asthenoteratozoospermia with IDA defects and central pair loss specifically in sperm flagella (not cilia), and the resulting male infertility can be rescued by ICSI."},"narrative":{"mechanistic_narrative":"DNAH12 is an axonemal inner dynein arm heavy chain required specifically for sperm flagellar axoneme assembly, where it serves as a scaffold linking inner dynein arm (IDA) machinery to the central pair apparatus. It physically interacts with the IDA components DNALI1 and DNAH1 and is required for their recruitment to inner dynein arms; loss of DNAH12 prevents this recruitment and produces IDA assembly defects. DNAH12 additionally interacts with the radial spoke head proteins RSPH1, RSPH9, and DNAJB13, and its deficiency causes central pair loss, indicating a role in stabilizing the central pair apparatus. This function is flagella-specific: DNAH12 deficiency leaves cilium organization and function intact. Biallelic loss-of-function variants in humans cause severe asthenoteratozoospermia with IDA impairment and central pair loss, a phenotype recapitulated in Dnah12 knockout mice, and the resulting infertility is rescued by intracytoplasmic sperm injection [PMID:39071892]. In the Chlamydomonas ortholog (DHC3), the protein localizes preferentially to the proximal flagellar axoneme and depends on CFAP57/FAP57 for incorporation into the axoneme [PMID:19351714, PMID:32764743].","teleology":[{"year":2020,"claim":"Before DNAH12 had a defined axonemal position, ortholog studies established where this dynein resides and how it is incorporated, framing it as a spatially restricted inner dynein component.","evidence":"Immunofluorescence localization of DHC3/DHC4 in Chlamydomonas growing flagella, and TMT mass spectrometry of fap57 mutant axonemes showing reduced DHC3","pmids":["19351714","32764743"],"confidence":"Medium","gaps":["Ortholog data does not establish the human DNAH12 interaction network","Mechanism of CFAP57-dependent incorporation not resolved at the human/mammalian level"]},{"year":2024,"claim":"The central question of DNAH12's molecular role was answered by showing it scaffolds IDA assembly through direct partners, defining it as a recruiter of DNALI1 and DNAH1.","evidence":"Co-immunoprecipitation plus Dnah12 knockout/mutant mouse models with TEM and immunofluorescence (preprint)","pmids":[],"confidence":"High","gaps":["Reciprocal interaction mapping and the order of assembly not fully resolved","Whether DNAH12 retains catalytic dynein activity is not addressed"]},{"year":2024,"claim":"Beyond IDAs, the experiments linked DNAH12 to the central pair apparatus, establishing a dual structural role spanning two axonemal substructures.","evidence":"Co-immunoprecipitation with RSPH1/RSPH9/DNAJB13 and TEM showing central pair loss in Dnah12 knockout mice (preprint)","pmids":[],"confidence":"Medium","gaps":["Direct versus indirect nature of radial spoke head interactions not distinguished","Mechanism connecting an IDA dynein to central pair stability is unexplained","Single study/lab"]},{"year":2024,"claim":"The tissue specificity question — why a broadly expressed dynein causes only reproductive disease — was addressed by showing cilia are unaffected, localizing the requirement to sperm flagella.","evidence":"Ciliary function assessment in Dnah12 knockout mice (negative ciliary phenotype) (preprint)","pmids":[],"confidence":"Medium","gaps":["Molecular basis of flagella-versus-cilia selectivity not identified","Possible compensation by paralogs in cilia not examined"]},{"year":2024,"claim":"Human genetic causality was established, converting the mechanistic model into a defined cause of male infertility with a clinical rescue route.","evidence":"Whole-exome sequencing of multiple families, TEM of patient sperm, Dnah12 knockout/knock-in mice, and ICSI rescue in mice and patients","pmids":["39071892"],"confidence":"High","gaps":["Genotype-phenotype spectrum across variant classes not fully mapped","Whether all defects share a single assembly mechanism is not resolved"]},{"year":2025,"claim":"An indirect link placed DNAH12 in structural proximity to radial spoke 1, consistent with its dual IDA/central-pair role.","evidence":"Mass spectrometry and western blot of Iqub knockout mouse showing reduced DNAH7 and DNAH12 in RS1 defect context","pmids":["39849482"],"confidence":"Low","gaps":["DNAH12 reduction is a downstream consequence of IQUB loss, not a direct DNAH12 experiment","Does not establish a direct DNAH12-RS1 interaction"]},{"year":null,"claim":"Whether DNAH12 functions as a catalytically active motor or purely as a structural/adaptor heavy chain, and the structural basis for its bridging of IDAs and the central pair, remain unresolved.","evidence":"","pmids":[],"confidence":"Low","gaps":["No structural model of DNAH12 within the axoneme","Motor/ATPase activity not directly tested","Assembly hierarchy among DNAH12, DNALI1, DNAH1, and radial spoke heads undefined"]}],"mechanism_profile":{"molecular_activity":[{"term_id":"GO:0060090","term_label":"molecular adaptor activity","supporting_discovery_ids":[0,1]},{"term_id":"GO:0005198","term_label":"structural molecule activity","supporting_discovery_ids":[0,1]}],"localization":[{"term_id":"GO:0005929","term_label":"cilium","supporting_discovery_ids":[7,9]},{"term_id":"GO:0005856","term_label":"cytoskeleton","supporting_discovery_ids":[0,8]}],"pathway":[{"term_id":"R-HSA-1474165","term_label":"Reproduction","supporting_discovery_ids":[3,5]},{"term_id":"R-HSA-1852241","term_label":"Organelle biogenesis and maintenance","supporting_discovery_ids":[0,1]}],"complexes":["inner dynein arm","central pair apparatus","axoneme"],"partners":["DNALI1","DNAH1","RSPH1","RSPH9","DNAJB13"],"other_free_text":[]}},"prefetch_data":{"uniprot":{"accession":"Q6ZR08","full_name":"Dynein axonemal heavy chain 12","aliases":["Axonemal beta dynein heavy chain 12","Axonemal dynein heavy chain 12-like protein","Axonemal dynein heavy chain 7-like protein","Ciliary dynein heavy chain 12","Dynein axonemal heavy chain 7-like","Dynein heavy chain domain-containing protein 2"],"length_aa":3092,"mass_kda":356.9,"function":"Involved in spermiogenesis. Plays a role in the proper organization of axoneme in sperm flagella, but not in cilia, by recruiting DNAH1 and DNALI1 to flagellum","subcellular_location":"Cell projection, cilium, flagellum","url":"https://www.uniprot.org/uniprotkb/Q6ZR08/entry"},"depmap":{"release":"DepMap","has_data":true,"is_common_essential":false,"resolved_as":"","url":"https://depmap.org/portal/gene/DNAH12","classification":"Not Classified","n_dependent_lines":1,"n_total_lines":1208,"dependency_fraction":0.0008278145695364238},"opencell":{"profiled":false,"resolved_as":"","ensg_id":"","cell_line_id":"","localizations":[],"interactors":[],"url":"https://opencell.sf.czbiohub.org/search/DNAH12","total_profiled":1310},"omim":[{"mim_id":"621209","title":"SPERMATOGENIC FAILURE 100; SPGF100","url":"https://www.omim.org/entry/621209"},{"mim_id":"618801","title":"CILIARY DYSKINESIA, PRIMARY, 45; CILD45","url":"https://www.omim.org/entry/618801"},{"mim_id":"614566","title":"DYNEIN, AXONEMAL, ASSEMBLY FACTOR 3; DNAAF3","url":"https://www.omim.org/entry/614566"},{"mim_id":"610732","title":"TETRATRICOPEPTIDE REPEAT DOMAIN-CONTAINING PROTEIN 12; TTC12","url":"https://www.omim.org/entry/610732"},{"mim_id":"606763","title":"CILIARY DYSKINESIA, PRIMARY, 2; CILD2","url":"https://www.omim.org/entry/606763"}],"hpa":{"profiled":true,"resolved_as":"","reliability":"Approved","locations":[{"location":"Centrosome","reliability":"Approved"},{"location":"Mid piece","reliability":"Approved"},{"location":"Principal piece","reliability":"Approved"},{"location":"Cytosol","reliability":"Additional"}],"tissue_specificity":"Group enriched","tissue_distribution":"Detected in some","driving_tissues":[{"tissue":"choroid plexus","ntpm":8.7},{"tissue":"fallopian tube","ntpm":9.7},{"tissue":"lung","ntpm":3.5},{"tissue":"testis","ntpm":8.4}],"url":"https://www.proteinatlas.org/search/DNAH12"},"hgnc":{"alias_symbol":["DLP12","Dnahc3","HL-19","hdhc3","DHC3","FLJ40427","FLJ44290"],"prev_symbol":["DNHD2","DNAH12L","DNAH7L"]},"alphafold":{"accession":"Q6ZR08","domains":[],"viewer_url":"https://alphafold.ebi.ac.uk/entry/Q6ZR08","model_url":"https://alphafold.ebi.ac.uk/files/AF-Q6ZR08-4-F1-model_v6.cif","pae_url":"https://alphafold.ebi.ac.uk/files/AF-Q6ZR08-4-F1-predicted_aligned_error_v6.png","plddt_mean":83.19},"mouse_models":{"mgi_url":"https://www.informatics.jax.org/marker/summary?nomen=DNAH12","jax_strain_url":"https://www.jax.org/strain/search?query=DNAH12"},"sequence":{"accession":"Q6ZR08","fasta_url":"https://rest.uniprot.org/uniprotkb/Q6ZR08.fasta","uniprot_url":"https://www.uniprot.org/uniprotkb/Q6ZR08/entry","alphafold_viewer_url":"https://alphafold.ebi.ac.uk/entry/Q6ZR08"}},"corpus_meta":[{"pmid":"9484596","id":"PMC_9484596","title":"Kinesin 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mice","date":"2024-06-23","source":"bioRxiv","url":"https://doi.org/10.1101/2024.06.20.599934","citation_count":0,"is_preprint":true}],"cost":{"stage1":{"model":"claude-sonnet-4-6","input_tokens":25294,"output_tokens":2355,"usd":0.055604,"stage1_stop_reason":"end_turn"},"stage2":{"model":"claude-opus-4-8","input_tokens":9436,"output_tokens":2413,"usd":0.053753,"stage2_stop_reason":"end_turn"},"total_usd":0.109357,"stage1_batch_id":"msgbatch_01AsR7g8dGTEiEw9U83bJeWn","stage2_batch_id":"msgbatch_01YV5ZyxtFNUZEjxRcpd9jzb","note":"batch pricing = 50% of standard"},"stage1_raw":"```json\n{\n  \"discoveries\": [\n    {\n      \"year\": 2024,\n      \"finding\": \"DNAH12 physically interacts with inner dynein arm (IDA) components DNALI1 and DNAH1; loss of DNAH12 causes failed recruitment of DNALI1 and DNAH1 to IDAs in sperm flagella, impairing IDA assembly.\",\n      \"method\": \"Co-immunoprecipitation (interaction), Dnah12 knockout and Dnah12 mut/mut mouse models with transmission electron microscopy (TEM) showing IDA defects, immunofluorescence showing loss of DNALI1 and DNAH1 from flagella\",\n      \"journal\": \"bioRxiv\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — reciprocal interaction confirmed, genetic knockout models in mice with defined ultrastructural phenotype, multiple orthogonal methods (WES, TEM, IF, mouse KO) in a single rigorous study\",\n      \"pmids\": [],\n      \"is_preprint\": true\n    },\n    {\n      \"year\": 2024,\n      \"finding\": \"DNAH12 interacts with radial spoke head proteins RSPH1, RSPH9, and DNAJB13, and its deficiency leads to central pair (CP) loss in sperm flagella, indicating DNAH12 regulates central pair stability via these interactions.\",\n      \"method\": \"Co-immunoprecipitation (interaction), Dnah12 knockout mouse TEM showing central pair loss\",\n      \"journal\": \"bioRxiv\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — interactions confirmed by Co-IP and functional consequence shown by TEM in KO mice, single lab/study\",\n      \"pmids\": [],\n      \"is_preprint\": true\n    },\n    {\n      \"year\": 2024,\n      \"finding\": \"DNAH12 deficiency does not affect cilium organization or function; its role is specific to sperm flagella axoneme assembly.\",\n      \"method\": \"Dnah12 knockout mouse model with assessment of ciliary function (negative result for ciliary phenotype)\",\n      \"journal\": \"bioRxiv\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — clean KO mouse model with specific functional readout (cilia unaffected), single lab; negative finding mechanistically informative for tissue specificity\",\n      \"pmids\": [],\n      \"is_preprint\": true\n    },\n    {\n      \"year\": 2024,\n      \"finding\": \"Biallelic loss-of-function variants in DNAH12 cause severe asthenoteratozoospermia with pronounced axonemal abnormalities (IDA impairment and central pair loss) in human sperm flagella, confirmed in Dnah12 knockout mice.\",\n      \"method\": \"Whole-exome sequencing + Sanger sequencing in six families, TEM of patient sperm, Dnah12 knockout and knock-in mouse models recapitulating infertility phenotype\",\n      \"journal\": \"bioRxiv\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — genetic evidence from multiple families co-segregating with phenotype, TEM ultrastructural validation, mouse KO recapitulation; multiple orthogonal methods\",\n      \"pmids\": [],\n      \"is_preprint\": true\n    },\n    {\n      \"year\": 2024,\n      \"finding\": \"Infertility caused by DNAH12 deficiency (Dnah12 knockout mice) can be rescued by intracytoplasmic sperm injection (ICSI), establishing the functional consequence is limited to natural fertilization competence.\",\n      \"method\": \"ICSI in Dnah12 knockout mice and human patients with DNAH12 variants\",\n      \"journal\": \"iScience\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — direct functional rescue experiment in mouse KO model and human patients, single lab, two independent datasets (human and mouse)\",\n      \"pmids\": [\"39071892\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2024,\n      \"finding\": \"Biallelic deleterious variants in DNAH12 cause severe asthenozoospermia with abnormal sperm flagella morphology and structure in humans, and Dnah12 knockout mice recapitulate the male infertility phenotype with spermatogenesis failure.\",\n      \"method\": \"Whole-exome sequencing of infertile men, semen analysis, Dnah12 knockout mouse model\",\n      \"journal\": \"iScience\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — genetic variants identified in human patients, mouse KO independently validates causal relationship; replicated across two studies (iScience and preprint)\",\n      \"pmids\": [\"39071892\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2025,\n      \"finding\": \"DNAH12 deficiency causes significant downregulation of inner dynein arm components DNAH7 and DNAH12 in the context of radial spoke 1 (RS1) defects, highlighting the nearby structural relationship between RS1 and these IDA components in sperm flagella.\",\n      \"method\": \"Iqub knockout mouse model with protein mass spectrometry and western blotting identifying reduced DNAH7 and DNAH12 levels\",\n      \"journal\": \"Cell communication and signaling : CCS\",\n      \"confidence\": \"Low\",\n      \"confidence_rationale\": \"Tier 3 / Weak — DNAH12 reduced as a consequence of another gene's KO (IQUB), not a direct experiment on DNAH12 itself; single method inference about DNAH12 localization near RS1\",\n      \"pmids\": [\"39849482\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2020,\n      \"finding\": \"DNAH12 (DHC3) and DHC4 in Chlamydomonas localize preferentially to the proximal ~2 µm region of the flagellum (proximal flagellar axoneme), as demonstrated by analyses of growing flagella; this region has a distinct dynein composition from the rest of the axoneme.\",\n      \"method\": \"Immunofluorescence microscopy of Chlamydomonas flagella; analysis of growing flagella to track dynein localization\",\n      \"journal\": \"Journal of cell science\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — direct immunofluorescence localization experiment in Chlamydomonas with ortholog DHC3/DHC4; single lab, single method but clear functional localization data\",\n      \"pmids\": [\"19351714\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2020,\n      \"finding\": \"In Chlamydomonas, FAP57/CFAP57 is required for proper incorporation of 'g' inner dyneins (DHC7 and DHC3, the ortholog of DNAH12) into the axoneme; loss of FAP57 causes reduction of DHC3 (DNAH12 ortholog) in the axoneme.\",\n      \"method\": \"Tandem mass tag (TMT) mass spectrometry of Chlamydomonas fap57 mutant axonemes showing reduced DHC3/DHC7\",\n      \"journal\": \"PLoS genetics\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — mass spectrometry of KO axoneme in Chlamydomonas ortholog system; single lab but quantitative proteomic method directly measuring DHC3 reduction\",\n      \"pmids\": [\"32764743\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2014,\n      \"finding\": \"The VE1 antibody cross-reacts with epitopes in DNAH12 (among other axonemal dynein heavy chains); ELISA assays confirmed VE1 recognizes epitopes from DNAH12, establishing that DNAH12 protein is present in cilia and flagella of multiple human tissues.\",\n      \"method\": \"ELISA assay showing VE1 antibody binding to DNAH12 epitopes; sequence homology analysis identifying the cross-reactive epitope\",\n      \"journal\": \"Modern pathology\",\n      \"confidence\": \"Low\",\n      \"confidence_rationale\": \"Tier 3 / Weak — ELISA epitope recognition is indirect localization evidence; establishes axonemal presence but by cross-reactivity rather than dedicated DNAH12 experiment\",\n      \"pmids\": [\"25412847\"],\n      \"is_preprint\": false\n    }\n  ],\n  \"current_model\": \"DNAH12 is an axonemal dynein heavy chain that lacks a microtubule-binding domain and plays a critical, flagella-specific role in sperm axoneme assembly: it physically interacts with inner dynein arm (IDA) components DNALI1 and DNAH1 and is required for their recruitment to IDAs, and also interacts with radial spoke head proteins RSPH1, RSPH9, and DNAJB13 to stabilize the central pair apparatus; biallelic loss-of-function mutations in humans and Dnah12 knockout mice cause severe asthenoteratozoospermia with IDA defects and central pair loss specifically in sperm flagella (not cilia), and the resulting male infertility can be rescued by ICSI.\"\n}\n```","stage2_raw":"{\n  \"mechanistic_narrative\": \"DNAH12 is an axonemal inner dynein arm heavy chain required specifically for sperm flagellar axoneme assembly, where it serves as a scaffold linking inner dynein arm (IDA) machinery to the central pair apparatus [#0, #1, #3]. It physically interacts with the IDA components DNALI1 and DNAH1 and is required for their recruitment to inner dynein arms; loss of DNAH12 prevents this recruitment and produces IDA assembly defects [#0]. DNAH12 additionally interacts with the radial spoke head proteins RSPH1, RSPH9, and DNAJB13, and its deficiency causes central pair loss, indicating a role in stabilizing the central pair apparatus [#1]. This function is flagella-specific: DNAH12 deficiency leaves cilium organization and function intact [#2]. Biallelic loss-of-function variants in humans cause severe asthenoteratozoospermia with IDA impairment and central pair loss, a phenotype recapitulated in Dnah12 knockout mice, and the resulting infertility is rescued by intracytoplasmic sperm injection [#3, #4, #5]. In the Chlamydomonas ortholog (DHC3), the protein localizes preferentially to the proximal flagellar axoneme and depends on CFAP57/FAP57 for incorporation into the axoneme [#7, #8].\",\n  \"teleology\": [\n    {\n      \"year\": 2020,\n      \"claim\": \"Before DNAH12 had a defined axonemal position, ortholog studies established where this dynein resides and how it is incorporated, framing it as a spatially restricted inner dynein component.\",\n      \"evidence\": \"Immunofluorescence localization of DHC3/DHC4 in Chlamydomonas growing flagella, and TMT mass spectrometry of fap57 mutant axonemes showing reduced DHC3\",\n      \"pmids\": [\"19351714\", \"32764743\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Ortholog data does not establish the human DNAH12 interaction network\", \"Mechanism of CFAP57-dependent incorporation not resolved at the human/mammalian level\"]\n    },\n    {\n      \"year\": 2024,\n      \"claim\": \"The central question of DNAH12's molecular role was answered by showing it scaffolds IDA assembly through direct partners, defining it as a recruiter of DNALI1 and DNAH1.\",\n      \"evidence\": \"Co-immunoprecipitation plus Dnah12 knockout/mutant mouse models with TEM and immunofluorescence (preprint)\",\n      \"pmids\": [],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Reciprocal interaction mapping and the order of assembly not fully resolved\", \"Whether DNAH12 retains catalytic dynein activity is not addressed\"]\n    },\n    {\n      \"year\": 2024,\n      \"claim\": \"Beyond IDAs, the experiments linked DNAH12 to the central pair apparatus, establishing a dual structural role spanning two axonemal substructures.\",\n      \"evidence\": \"Co-immunoprecipitation with RSPH1/RSPH9/DNAJB13 and TEM showing central pair loss in Dnah12 knockout mice (preprint)\",\n      \"pmids\": [],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Direct versus indirect nature of radial spoke head interactions not distinguished\", \"Mechanism connecting an IDA dynein to central pair stability is unexplained\", \"Single study/lab\"]\n    },\n    {\n      \"year\": 2024,\n      \"claim\": \"The tissue specificity question — why a broadly expressed dynein causes only reproductive disease — was addressed by showing cilia are unaffected, localizing the requirement to sperm flagella.\",\n      \"evidence\": \"Ciliary function assessment in Dnah12 knockout mice (negative ciliary phenotype) (preprint)\",\n      \"pmids\": [],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Molecular basis of flagella-versus-cilia selectivity not identified\", \"Possible compensation by paralogs in cilia not examined\"]\n    },\n    {\n      \"year\": 2024,\n      \"claim\": \"Human genetic causality was established, converting the mechanistic model into a defined cause of male infertility with a clinical rescue route.\",\n      \"evidence\": \"Whole-exome sequencing of multiple families, TEM of patient sperm, Dnah12 knockout/knock-in mice, and ICSI rescue in mice and patients\",\n      \"pmids\": [\"39071892\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Genotype-phenotype spectrum across variant classes not fully mapped\", \"Whether all defects share a single assembly mechanism is not resolved\"]\n    },\n    {\n      \"year\": 2025,\n      \"claim\": \"An indirect link placed DNAH12 in structural proximity to radial spoke 1, consistent with its dual IDA/central-pair role.\",\n      \"evidence\": \"Mass spectrometry and western blot of Iqub knockout mouse showing reduced DNAH7 and DNAH12 in RS1 defect context\",\n      \"pmids\": [\"39849482\"],\n      \"confidence\": \"Low\",\n      \"gaps\": [\"DNAH12 reduction is a downstream consequence of IQUB loss, not a direct DNAH12 experiment\", \"Does not establish a direct DNAH12-RS1 interaction\"]\n    },\n    {\n      \"year\": null,\n      \"claim\": \"Whether DNAH12 functions as a catalytically active motor or purely as a structural/adaptor heavy chain, and the structural basis for its bridging of IDAs and the central pair, remain unresolved.\",\n      \"evidence\": \"\",\n      \"pmids\": [],\n      \"confidence\": \"Low\",\n      \"gaps\": [\"No structural model of DNAH12 within the axoneme\", \"Motor/ATPase activity not directly tested\", \"Assembly hierarchy among DNAH12, DNALI1, DNAH1, and radial spoke heads undefined\"]\n    }\n  ],\n  \"mechanism_profile\": {\n    \"molecular_activity\": [\n      {\"term_id\": \"GO:0060090\", \"supporting_discovery_ids\": [0, 1]},\n      {\"term_id\": \"GO:0005198\", \"supporting_discovery_ids\": [0, 1]}\n    ],\n    \"localization\": [\n      {\"term_id\": \"GO:0005929\", \"supporting_discovery_ids\": [7, 9]},\n      {\"term_id\": \"GO:0005856\", \"supporting_discovery_ids\": [0, 8]}\n    ],\n    \"pathway\": [\n      {\"term_id\": \"R-HSA-1474165\", \"supporting_discovery_ids\": [3, 5]},\n      {\"term_id\": \"R-HSA-1852241\", \"supporting_discovery_ids\": [0, 1]}\n    ],\n    \"complexes\": [\"inner dynein arm\", \"central pair apparatus\", \"axoneme\"],\n    \"partners\": [\"DNALI1\", \"DNAH1\", \"RSPH1\", \"RSPH9\", \"DNAJB13\"],\n    \"other_free_text\": []\n  }\n}","audit_flag":{"gene":"DNAH12","tier":"GROUNDING","verdict":"Evidence-grounding concern","subtype":"uncited_synthesis","uniprot_band":"sparse","rules_fired":"R6,R8","issue":"R6: narrative-cited PMIDs vs gene2pubmed overlap = 0.00% (n_cited=5, n_g2p=31); R8: 3/5 claims uncited (60%)"},"evaluation":{"pairwise":"win","faith_supported":2,"faith_total":2,"faith_pct":100.0}}