{"gene":"DYNC2H1","run_date":"2026-06-09T23:54:42","timeline":{"discoveries":[{"year":1999,"finding":"DHC1b (DYNC2H1 ortholog in Chlamydomonas) is required for retrograde intraflagellar transport (IFT): deletion of DHC1b causes very short flagella, massive redistribution of IFT raft subunits from a peri-basal body pool into flagella, and loss of retrograde IFT movement, while anterograde IFT proceeds. Western blots confirm DHC1b is present in the flagellum in detergent- and ATP-soluble fractions, consistent with its role as the retrograde IFT motor.","method":"Genetic deletion mutant characterization, Western blot, immunolocalization, IFT particle redistribution assay","journal":"The Journal of cell biology","confidence":"High","confidence_rationale":"Tier 2 / Strong — clean loss-of-function mutant with specific IFT phenotype, biochemical fractionation confirming flagellar localization, replicated conceptually in C. elegans (PMID:10545497)","pmids":["9971742"],"is_preprint":false},{"year":1999,"finding":"CHE-3 (C. elegans DHC1b/DYNC2H1 ortholog) is specifically responsible for retrograde transport of the anterograde IFT motor kinesin-II and its cargo (OSM-1, OSM-6) within sensory cilia but not within dendrites; loss of che-3 inhibits retrograde IFT in cilia while anterograde IFT proceeds normally.","method":"Fluorescence microscopy-based transport assay in living C. elegans, che-3 mutant genetic analysis","journal":"The Journal of cell biology","confidence":"High","confidence_rationale":"Tier 2 / Strong — direct visualization of IFT movement in living animals, genetic mutant with defined ciliary vs. dendritic specificity, orthogonal to PMID:9971742","pmids":["10545497"],"is_preprint":false},{"year":1996,"finding":"DHC1b (DYNC2H1) is a cytoplasmic dynein isoform expressed in both ciliated and non-ciliated cells; in ciliated rat tracheal epithelial cells, DHC1b protein localizes to the cytoplasm (not to cilia), accumulates at the apical ends of cells, and its expression increases during ciliogenesis, distinguishing it from axonemal dyneins and from conventional cytoplasmic dynein DHC1a.","method":"Isoform-specific antibody generation, indirect immunofluorescence microscopy, Western blot, expression during ciliogenesis in cultured rat tracheal epithelial cells","journal":"Journal of cell science","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — isoform-specific antibody with immunofluorescence localization, single lab, multiple tissue/cell-type comparisons","pmids":["8832411"],"is_preprint":false},{"year":2009,"finding":"Loss-of-function mutations in DYNC2H1 cause skeletal ciliopathy (asphyxiating thoracic dystrophy/short rib-polydactyly syndrome), establishing that DYNC2H1 is directly involved in the generation and maintenance of cilia in humans; cultured chondrocytes from affected individuals show morphologically abnormal, shortened cilia and abnormal cytoskeletal microtubule architecture.","method":"Homozygosity mapping, Sanger sequencing, cell morphology analysis of patient-derived chondrocytes (cilia length and microtubule architecture)","journal":"American journal of human genetics","confidence":"High","confidence_rationale":"Tier 2 / Strong — multiple independent families with compound heterozygous or homozygous mutations, direct cellular phenotype in patient chondrocytes, replicated across two concurrent papers (PMID:19361615 and PMID:19442771)","pmids":["19361615","19442771"],"is_preprint":false},{"year":2013,"finding":"Loss of DYNC2H1 function results in accumulation of anterograde IFT proteins at ciliary tips in patient fibroblasts, confirming a retrograde IFT defect; missense mutations cluster to functional domains including the ATP motor domain, indicating the motor domain is critical for function.","method":"Exome sequencing, SNP mapping, patient fibroblast immunofluorescence showing anterograde IFT protein accumulation at ciliary tips","journal":"Journal of medical genetics","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — patient-derived cell assay showing IFT88 accumulation at cilia tips as a functional readout, single lab, consistent with retrograde IFT motor role","pmids":["23456818"],"is_preprint":false},{"year":2015,"finding":"In medaka (Oryzias latipes), loss of dhc2 (DYNC2H1 ortholog) causes shortened cilia and partial defects in Hedgehog signaling; Ptch1 receptor localizes exclusively to cilia in fish as in mammals, placing DYNC2H1-dependent retrograde IFT upstream of ciliary Hedgehog signal transduction.","method":"Maternal-zygotic mutant generation and phenotypic analysis, immunolocalization of Ptch1 to cilia, Hh pathway gene expression analysis","journal":"BMC developmental biology","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — genetic loss-of-function in vertebrate model organism with defined ciliary and Hh signaling phenotypes, single lab","pmids":["25645819"],"is_preprint":false},{"year":2019,"finding":"DYNC2H1 (DHC2) mediates nuclear localization of DNA repair proteins XPC and CBX5; knockdown of DHC2 impairs nuclear transport of XPC and CBX5, leading to increased temozolomide-induced DNA damage in MGMT-deficient glioblastoma cells; this mechanism underlies acquired temozolomide resistance.","method":"siRNA knockdown, subcellular proteomics, immunofluorescence of XPC/CBX5 localization, in vitro and in vivo TMZ sensitivity assays","journal":"Brain : a journal of neurology","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — subcellular proteomics combined with functional knockdown and in vitro/in vivo validation, single lab","pmids":["31347685"],"is_preprint":false},{"year":2020,"finding":"Hypomorphic DYNC2H1 variants (including one disrupting the exon 41 splice donor) impair dynein-2 motility in vitro and perturb IFT88 distribution within cilia; a retina-predominant DYNC2H1 transcript whose expression increases during retinal organoid differentiation was identified, and variants disrupting only this transcript cause nonsyndromic inherited retinal degeneration.","method":"In vitro dynein motility assay, fibroblast cilia assay (IFT88 distribution), iPSC-derived retinal organoids, genome/exome sequencing","journal":"Genetics in medicine","confidence":"High","confidence_rationale":"Tier 1-2 / Moderate — dynein motility reconstitution assay plus orthogonal cellular IFT assay plus retinal organoid model, single lab but multiple orthogonal methods","pmids":["32753734"],"is_preprint":false},{"year":2025,"finding":"Loss of Dync2h1 in NIH/3T3 fibroblasts (Dync2h1-KO) abolishes the production of a cilium-dependent wound-healing secretome; conditioned medium from Dync2h1-KO cells fails to enhance wound healing in primary cilium-deficient fibroblasts, whereas wild-type conditioned medium (enriched in LPC(14:0)) does, placing DYNC2H1-dependent ciliary function upstream of paracrine secretion of LPC(14:0) and ECM-remodeling signals.","method":"Dync2h1-KO cell line, conditioned medium transfer assay, fractionation, untargeted metabolomics, transcriptomic profiling","journal":"bioRxiv","confidence":"Low","confidence_rationale":"Tier 3 / Weak — preprint, single lab, indirect functional readout through conditioned medium, DYNC2H1-specific mechanistic contribution not directly isolated from general ciliary loss","pmids":["bio_10.1101_2025.08.20.671189"],"is_preprint":true}],"current_model":"DYNC2H1 encodes the heavy chain of cytoplasmic dynein-2, which functions as the motor for retrograde intraflagellar transport (IFT) in cilia—moving IFT raft particles and anterograde motors (kinesin-II) from the ciliary tip back to the cell body—thereby enabling ciliogenesis and ciliary Hedgehog signal transduction; loss-of-function mutations cause ciliary shortening, anterograde IFT protein accumulation at ciliary tips, and skeletal ciliopathies (Jeune syndrome/SRTD3), and hypomorphic variants impair dynein-2 motility and disrupt IFT88 distribution within cilia; additionally, DYNC2H1 participates in nuclear transport of the DNA repair proteins XPC and CBX5 in glioblastoma cells."},"narrative":{"mechanistic_narrative":"DYNC2H1 encodes the heavy chain of cytoplasmic dynein-2, the motor that drives retrograde intraflagellar transport (IFT) in cilia and flagella [PMID:9971742, PMID:10545497]. Studies of the orthologous heavy chains in Chlamydomonas and C. elegans established that loss of this motor abolishes retrograde IFT while leaving anterograde transport intact, causing severely shortened cilia and redistribution of IFT raft components and the anterograde kinesin-II motor and its cargo into the ciliary compartment [PMID:9971742, PMID:10545497]. The protein is a cytoplasmic dynein isoform distinct from conventional dynein-1 and from axonemal dyneins, and its expression rises during ciliogenesis [PMID:8832411]. By recycling IFT machinery from the ciliary tip, dynein-2 is required for normal cilium assembly and length, and it acts upstream of ciliary Hedgehog signal transduction [PMID:25645819]. In humans, biallelic loss-of-function and hypomorphic DYNC2H1 mutations cause skeletal ciliopathies (asphyxiating thoracic dystrophy/short rib-polydactyly syndrome), with patient cells showing shortened cilia, abnormal microtubule architecture, and accumulation of anterograde IFT proteins such as IFT88 at ciliary tips—the diagnostic signature of a retrograde IFT defect [PMID:19361615, PMID:19442771, PMID:23456818]; missense mutations cluster in functional domains including the ATP motor domain, and hypomorphic variants directly impair dynein-2 motility in vitro [PMID:23456818, PMID:32753734]. A retina-predominant DYNC2H1 transcript exists whose selective disruption causes nonsyndromic inherited retinal degeneration [PMID:32753734]. Beyond cilia, DYNC2H1 has been implicated in nuclear localization of the DNA repair proteins XPC and CBX5 in glioblastoma cells [PMID:31347685].","teleology":[{"year":1999,"claim":"Established that the dynein-2 heavy chain is the dedicated retrograde IFT motor, resolving how IFT machinery returns from the ciliary tip while anterograde transport continues independently.","evidence":"Genetic deletion of DHC1b in Chlamydomonas with IFT particle redistribution assay and flagellar biochemical fractionation, plus live-animal IFT imaging of che-3 mutants in C. elegans","pmids":["9971742","10545497"],"confidence":"High","gaps":["Did not resolve the molecular composition of the dynein-2 holocomplex or its regulatory subunits","Mechanism of motor loading/unloading at the ciliary tip not addressed"]},{"year":1996,"claim":"Defined DHC1b/DYNC2H1 as a distinct cytoplasmic dynein isoform separate from conventional dynein-1 and axonemal dyneins, and linked its expression to ciliogenesis.","evidence":"Isoform-specific antibody immunofluorescence and Western blot in cultured rat tracheal epithelial cells across ciliogenesis","pmids":["8832411"],"confidence":"Medium","gaps":["Reported cytoplasmic (non-ciliary) localization not reconciled with later retrograde IFT motor role","Single-lab antibody-based localization"]},{"year":2009,"claim":"Connected DYNC2H1 loss of function to a human skeletal ciliopathy, demonstrating that the motor is essential for cilium generation and maintenance in humans.","evidence":"Homozygosity mapping and Sanger sequencing in multiple families with patient-derived chondrocyte cilia/microtubule morphology analysis","pmids":["19361615","19442771"],"confidence":"High","gaps":["Did not establish genotype-phenotype correlation across mutation types","Mechanism linking ciliary defect to skeletal dysplasia not detailed"]},{"year":2013,"claim":"Provided the cellular signature of the retrograde defect in patients and mapped mutations to the motor domain, confirming motor activity is the critical function.","evidence":"Exome sequencing, SNP mapping, and patient fibroblast immunofluorescence showing anterograde IFT protein (IFT88) accumulation at ciliary tips","pmids":["23456818"],"confidence":"Medium","gaps":["No direct biochemical measurement of motor activity for the variants","Single-lab cellular readout"]},{"year":2015,"claim":"Placed DYNC2H1-dependent retrograde IFT upstream of ciliary Hedgehog signaling, linking the transport defect to a developmental signaling pathway.","evidence":"Maternal-zygotic dhc2 mutant medaka with ciliary phenotyping, Ptch1 ciliary immunolocalization, and Hh pathway gene expression","pmids":["25645819"],"confidence":"Medium","gaps":["Hh defects were partial; quantitative contribution of DYNC2H1 to Hh output unresolved","Single model organism, single lab"]},{"year":2019,"claim":"Implicated DYNC2H1 in a non-ciliary role—nuclear import of DNA repair proteins—underlying chemoresistance in glioblastoma.","evidence":"siRNA knockdown with subcellular proteomics, XPC/CBX5 localization imaging, and TMZ sensitivity assays in MGMT-deficient glioblastoma cells in vitro and in vivo","pmids":["31347685"],"confidence":"Medium","gaps":["Direct physical interaction of DYNC2H1 with XPC/CBX5 not established","Mechanistic basis for a cytoplasmic dynein-2 heavy chain mediating nuclear transport unclear","Single lab"]},{"year":2020,"claim":"Directly demonstrated that hypomorphic variants impair dynein-2 motility and identified a tissue-specific transcript whose disruption causes isolated retinal disease, expanding the allelic and phenotypic spectrum.","evidence":"In vitro dynein motility reconstitution assay, fibroblast IFT88 cilia assay, iPSC-derived retinal organoids, and genome/exome sequencing","pmids":["32753734"],"confidence":"High","gaps":["Structural basis of motility impairment for specific variants not resolved","Regulation of the retina-predominant transcript not characterized"]},{"year":2025,"claim":"Linked DYNC2H1-dependent ciliary function to production of a paracrine wound-healing secretome, extending its role to intercellular signaling.","evidence":"Dync2h1-KO NIH/3T3 cells with conditioned medium transfer, fractionation, untargeted metabolomics, and transcriptomics (preprint)","pmids":["bio_10.1101_2025.08.20.671189"],"confidence":"Low","gaps":["Preprint, single lab, not peer reviewed","DYNC2H1-specific contribution not isolated from general loss of cilia","Indirect readout through conditioned medium"]},{"year":null,"claim":"How DYNC2H1 might mediate nuclear transport of DNA repair proteins, mechanistically distinct from its retrograde IFT role, remains unexplained.","evidence":"","pmids":[],"confidence":"Low","gaps":["No structural model of dynein-2 with non-ciliary cargo","No reciprocal physical-interaction validation for XPC/CBX5","Tissue specificity of the non-ciliary role unclear"]}],"mechanism_profile":{"molecular_activity":[{"term_id":"GO:0140657","term_label":"ATP-dependent activity","supporting_discovery_ids":[0,7]},{"term_id":"GO:0003774","term_label":"cytoskeletal motor activity","supporting_discovery_ids":[0,1,7]}],"localization":[{"term_id":"GO:0005929","term_label":"cilium","supporting_discovery_ids":[0,4]},{"term_id":"GO:0005829","term_label":"cytosol","supporting_discovery_ids":[2]}],"pathway":[{"term_id":"GO:0005856","term_label":"cytoskeleton","supporting_discovery_ids":[0,3]},{"term_id":"R-HSA-162582","term_label":"Signal Transduction","supporting_discovery_ids":[5]},{"term_id":"R-HSA-1852241","term_label":"Organelle biogenesis and maintenance","supporting_discovery_ids":[0,3]}],"complexes":["cytoplasmic dynein-2"],"partners":["IFT88"],"other_free_text":[]}},"prefetch_data":{"uniprot":{"accession":"Q8NCM8","full_name":"Cytoplasmic dynein 2 heavy chain 1","aliases":["Cytoplasmic dynein 2 heavy chain","Dynein cytoplasmic heavy chain 2","Dynein heavy chain 11","hDHC11","Dynein heavy chain isotype 1B"],"length_aa":4307,"mass_kda":492.6,"function":"May function as a motor for intraflagellar retrograde transport. Functions in cilia biogenesis. May play a role in transport between endoplasmic reticulum and Golgi or organization of the Golgi in cells (By similarity)","subcellular_location":"Cytoplasm, cytoskeleton, cilium axoneme; Cell membrane; Cytoplasm","url":"https://www.uniprot.org/uniprotkb/Q8NCM8/entry"},"depmap":{"release":"DepMap","has_data":true,"is_common_essential":false,"resolved_as":"","url":"https://depmap.org/portal/gene/DYNC2H1","classification":"Not Classified","n_dependent_lines":2,"n_total_lines":1208,"dependency_fraction":0.0016556291390728477},"opencell":{"profiled":false,"resolved_as":"","ensg_id":"","cell_line_id":"","localizations":[],"interactors":[{"gene":"DYNC2LI1","stoichiometry":10.0},{"gene":"DYNLL1","stoichiometry":0.2},{"gene":"DYNLL2","stoichiometry":0.2}],"url":"https://opencell.sf.czbiohub.org/search/DYNC2H1","total_profiled":1310},"omim":[{"mim_id":"617353","title":"DYNEIN, LIGHT CHAIN, TCTEX-TYPE, 2B; DYNLT2B","url":"https://www.omim.org/entry/617353"},{"mim_id":"617088","title":"SHORT-RIB THORACIC DYSPLASIA 15 WITH POLYDACTYLY; SRTD15","url":"https://www.omim.org/entry/617088"},{"mim_id":"617083","title":"DYNEIN, CYTOPLASMIC 2, LIGHT INTERMEDIATE CHAIN 1; DYNC2LI1","url":"https://www.omim.org/entry/617083"},{"mim_id":"615633","title":"SHORT-RIB THORACIC DYSPLASIA 11 WITH OR WITHOUT POLYDACTYLY; SRTD11","url":"https://www.omim.org/entry/615633"},{"mim_id":"613819","title":"SHORT-RIB THORACIC DYSPLASIA 4 WITH OR WITHOUT POLYDACTYLY; SRTD4","url":"https://www.omim.org/entry/613819"}],"hpa":{"profiled":true,"resolved_as":"","reliability":"Approved","locations":[{"location":"Mitochondria","reliability":"Approved"},{"location":"Mid piece","reliability":"Approved"},{"location":"Nucleoplasm","reliability":"Additional"},{"location":"Cytosol","reliability":"Additional"},{"location":"Principal piece","reliability":"Additional"}],"tissue_specificity":"Tissue enhanced","tissue_distribution":"Detected in many","driving_tissues":[{"tissue":"choroid plexus","ntpm":18.0}],"url":"https://www.proteinatlas.org/search/DYNC2H1"},"hgnc":{"alias_symbol":["hdhc11","DHC2","DHC1b","DYH1B"],"prev_symbol":["DNCH2"]},"alphafold":{"accession":"Q8NCM8","domains":[],"viewer_url":"https://alphafold.ebi.ac.uk/entry/Q8NCM8","model_url":"https://alphafold.ebi.ac.uk/files/AF-Q8NCM8-3-F1-model_v6.cif","pae_url":"https://alphafold.ebi.ac.uk/files/AF-Q8NCM8-3-F1-predicted_aligned_error_v6.png","plddt_mean":83.44},"mouse_models":{"mgi_url":"https://www.informatics.jax.org/marker/summary?nomen=DYNC2H1","jax_strain_url":"https://www.jax.org/strain/search?query=DYNC2H1"},"sequence":{"accession":"Q8NCM8","fasta_url":"https://rest.uniprot.org/uniprotkb/Q8NCM8.fasta","uniprot_url":"https://www.uniprot.org/uniprotkb/Q8NCM8/entry","alphafold_viewer_url":"https://alphafold.ebi.ac.uk/entry/Q8NCM8"}},"corpus_meta":[{"pmid":"9971742","id":"PMC_9971742","title":"The DHC1b (DHC2) isoform of cytoplasmic dynein is required for flagellar 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Obstetricians","url":"https://pubmed.ncbi.nlm.nih.gov/37100787","citation_count":4,"is_preprint":false},{"pmid":"36087272","id":"PMC_36087272","title":"Pathogenic variant of DYNC2H1 associated with lingual hamartoma in a Chinese pedigree.","date":"2022","source":"Journal of oral pathology & medicine : official publication of the International Association of Oral Pathologists and the American Academy of Oral Pathology","url":"https://pubmed.ncbi.nlm.nih.gov/36087272","citation_count":3,"is_preprint":false},{"pmid":"36442996","id":"PMC_36442996","title":"Characterization of a novel deep-intronic variant in DYNC2H1 identified by whole-exome sequencing in a patient with a lethal form of a short-rib thoracic dysplasia type III.","date":"2022","source":"Cold Spring Harbor molecular case studies","url":"https://pubmed.ncbi.nlm.nih.gov/36442996","citation_count":3,"is_preprint":false},{"pmid":"39934438","id":"PMC_39934438","title":"DYNC2H1 mutation as a potential predictive biomarker for immune checkpoint inhibitor efficacy in NSCLC and melanoma.","date":"2025","source":"Investigational new drugs","url":"https://pubmed.ncbi.nlm.nih.gov/39934438","citation_count":2,"is_preprint":false},{"pmid":"25645819","id":"PMC_25645819","title":"The medaka dhc2 mutant reveals conserved and distinct mechanisms of Hedgehog signaling in teleosts.","date":"2015","source":"BMC developmental biology","url":"https://pubmed.ncbi.nlm.nih.gov/25645819","citation_count":2,"is_preprint":false},{"pmid":"35929941","id":"PMC_35929941","title":"[Family analysis of a child with Short-rib polydactyly syndrome type III due to variant of DYNC2H1 gene].","date":"2022","source":"Zhonghua yi xue yi chuan xue za zhi = Zhonghua yixue yichuanxue zazhi = Chinese journal of medical genetics","url":"https://pubmed.ncbi.nlm.nih.gov/35929941","citation_count":2,"is_preprint":false},{"pmid":"39361243","id":"PMC_39361243","title":"DYNC2H1 splicing variants causing severe prenatal short-rib polydactyly syndrome and postnatal orofaciodigital syndrome.","date":"2024","source":"Annals of human genetics","url":"https://pubmed.ncbi.nlm.nih.gov/39361243","citation_count":1,"is_preprint":false},{"pmid":"31415973","id":"PMC_31415973","title":"Generation of an induced pluripotent stem cell line (SDQLCHi003-a) from a patient with short rib-thoracic dysplasia syndrome type III carrying compound heterozygous mutations in DYNC2H1.","date":"2019","source":"Stem cell research","url":"https://pubmed.ncbi.nlm.nih.gov/31415973","citation_count":1,"is_preprint":false},{"pmid":"40339774","id":"PMC_40339774","title":"Expanding the genetic spectrum of short rib polydactyly syndrome: Novel DYNC2H1 variants and functional insights.","date":"2025","source":"Bone","url":"https://pubmed.ncbi.nlm.nih.gov/40339774","citation_count":0,"is_preprint":false},{"pmid":"39881416","id":"PMC_39881416","title":"A novel compound heterozygous mutation in the DYNC2H1 gene in a Chinese family with Jeune syndrome.","date":"2025","source":"Hereditas","url":"https://pubmed.ncbi.nlm.nih.gov/39881416","citation_count":0,"is_preprint":false},{"pmid":"31935347","id":"PMC_31935347","title":"Attenuated Type of Asphyxiating Thoracic Dysplasia due to Mutations in DYNC2H1 Gene.","date":"2019","source":"Prague medical report","url":"https://pubmed.ncbi.nlm.nih.gov/31935347","citation_count":0,"is_preprint":false},{"pmid":"38550721","id":"PMC_38550721","title":"Whole-Exome Sequencing Identifies DYNC2H1 Mutations as a Cause of Jeune Asphyxiating Thoracic Dystrophy Without Extra-Skeletal Organ Involvement.","date":"2024","source":"International medical case reports journal","url":"https://pubmed.ncbi.nlm.nih.gov/38550721","citation_count":0,"is_preprint":false},{"pmid":"41645379","id":"PMC_41645379","title":"[Clinical characteristics and prenatal diagnosis of a fetus with Short-rib thoracic dysplasia syndrome due to variants of DYNC2H1 gene].","date":"2025","source":"Zhonghua yi xue yi chuan xue za zhi = Zhonghua yixue yichuanxue zazhi = Chinese journal of medical genetics","url":"https://pubmed.ncbi.nlm.nih.gov/41645379","citation_count":0,"is_preprint":false},{"pmid":null,"id":"bio_10.1101_2025.08.20.671189","title":"Primary Cilium-dependent Humoral Bioactive Factors Acts in a Paracrine Manner to Control Fibroblast Cell Migration","date":"2025-08-20","source":"bioRxiv","url":"https://doi.org/10.1101/2025.08.20.671189","citation_count":0,"is_preprint":true}],"cost":{"stage1":{"model":"claude-sonnet-4-6","input_tokens":24337,"output_tokens":2560,"usd":0.055705,"stage1_stop_reason":"end_turn"},"stage2":{"model":"claude-opus-4-8","input_tokens":9747,"output_tokens":3133,"usd":0.06353,"stage2_stop_reason":"end_turn"},"total_usd":0.119235,"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\": 1999,\n      \"finding\": \"DHC1b (DYNC2H1 ortholog in Chlamydomonas) is required for retrograde intraflagellar transport (IFT): deletion of DHC1b causes very short flagella, massive redistribution of IFT raft subunits from a peri-basal body pool into flagella, and loss of retrograde IFT movement, while anterograde IFT proceeds. Western blots confirm DHC1b is present in the flagellum in detergent- and ATP-soluble fractions, consistent with its role as the retrograde IFT motor.\",\n      \"method\": \"Genetic deletion mutant characterization, Western blot, immunolocalization, IFT particle redistribution assay\",\n      \"journal\": \"The Journal of cell biology\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — clean loss-of-function mutant with specific IFT phenotype, biochemical fractionation confirming flagellar localization, replicated conceptually in C. elegans (PMID:10545497)\",\n      \"pmids\": [\"9971742\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 1999,\n      \"finding\": \"CHE-3 (C. elegans DHC1b/DYNC2H1 ortholog) is specifically responsible for retrograde transport of the anterograde IFT motor kinesin-II and its cargo (OSM-1, OSM-6) within sensory cilia but not within dendrites; loss of che-3 inhibits retrograde IFT in cilia while anterograde IFT proceeds normally.\",\n      \"method\": \"Fluorescence microscopy-based transport assay in living C. elegans, che-3 mutant genetic analysis\",\n      \"journal\": \"The Journal of cell biology\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — direct visualization of IFT movement in living animals, genetic mutant with defined ciliary vs. dendritic specificity, orthogonal to PMID:9971742\",\n      \"pmids\": [\"10545497\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 1996,\n      \"finding\": \"DHC1b (DYNC2H1) is a cytoplasmic dynein isoform expressed in both ciliated and non-ciliated cells; in ciliated rat tracheal epithelial cells, DHC1b protein localizes to the cytoplasm (not to cilia), accumulates at the apical ends of cells, and its expression increases during ciliogenesis, distinguishing it from axonemal dyneins and from conventional cytoplasmic dynein DHC1a.\",\n      \"method\": \"Isoform-specific antibody generation, indirect immunofluorescence microscopy, Western blot, expression during ciliogenesis in cultured rat tracheal epithelial cells\",\n      \"journal\": \"Journal of cell science\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — isoform-specific antibody with immunofluorescence localization, single lab, multiple tissue/cell-type comparisons\",\n      \"pmids\": [\"8832411\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2009,\n      \"finding\": \"Loss-of-function mutations in DYNC2H1 cause skeletal ciliopathy (asphyxiating thoracic dystrophy/short rib-polydactyly syndrome), establishing that DYNC2H1 is directly involved in the generation and maintenance of cilia in humans; cultured chondrocytes from affected individuals show morphologically abnormal, shortened cilia and abnormal cytoskeletal microtubule architecture.\",\n      \"method\": \"Homozygosity mapping, Sanger sequencing, cell morphology analysis of patient-derived chondrocytes (cilia length and microtubule architecture)\",\n      \"journal\": \"American journal of human genetics\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — multiple independent families with compound heterozygous or homozygous mutations, direct cellular phenotype in patient chondrocytes, replicated across two concurrent papers (PMID:19361615 and PMID:19442771)\",\n      \"pmids\": [\"19361615\", \"19442771\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2013,\n      \"finding\": \"Loss of DYNC2H1 function results in accumulation of anterograde IFT proteins at ciliary tips in patient fibroblasts, confirming a retrograde IFT defect; missense mutations cluster to functional domains including the ATP motor domain, indicating the motor domain is critical for function.\",\n      \"method\": \"Exome sequencing, SNP mapping, patient fibroblast immunofluorescence showing anterograde IFT protein accumulation at ciliary tips\",\n      \"journal\": \"Journal of medical genetics\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — patient-derived cell assay showing IFT88 accumulation at cilia tips as a functional readout, single lab, consistent with retrograde IFT motor role\",\n      \"pmids\": [\"23456818\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2015,\n      \"finding\": \"In medaka (Oryzias latipes), loss of dhc2 (DYNC2H1 ortholog) causes shortened cilia and partial defects in Hedgehog signaling; Ptch1 receptor localizes exclusively to cilia in fish as in mammals, placing DYNC2H1-dependent retrograde IFT upstream of ciliary Hedgehog signal transduction.\",\n      \"method\": \"Maternal-zygotic mutant generation and phenotypic analysis, immunolocalization of Ptch1 to cilia, Hh pathway gene expression analysis\",\n      \"journal\": \"BMC developmental biology\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — genetic loss-of-function in vertebrate model organism with defined ciliary and Hh signaling phenotypes, single lab\",\n      \"pmids\": [\"25645819\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2019,\n      \"finding\": \"DYNC2H1 (DHC2) mediates nuclear localization of DNA repair proteins XPC and CBX5; knockdown of DHC2 impairs nuclear transport of XPC and CBX5, leading to increased temozolomide-induced DNA damage in MGMT-deficient glioblastoma cells; this mechanism underlies acquired temozolomide resistance.\",\n      \"method\": \"siRNA knockdown, subcellular proteomics, immunofluorescence of XPC/CBX5 localization, in vitro and in vivo TMZ sensitivity assays\",\n      \"journal\": \"Brain : a journal of neurology\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — subcellular proteomics combined with functional knockdown and in vitro/in vivo validation, single lab\",\n      \"pmids\": [\"31347685\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2020,\n      \"finding\": \"Hypomorphic DYNC2H1 variants (including one disrupting the exon 41 splice donor) impair dynein-2 motility in vitro and perturb IFT88 distribution within cilia; a retina-predominant DYNC2H1 transcript whose expression increases during retinal organoid differentiation was identified, and variants disrupting only this transcript cause nonsyndromic inherited retinal degeneration.\",\n      \"method\": \"In vitro dynein motility assay, fibroblast cilia assay (IFT88 distribution), iPSC-derived retinal organoids, genome/exome sequencing\",\n      \"journal\": \"Genetics in medicine\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1-2 / Moderate — dynein motility reconstitution assay plus orthogonal cellular IFT assay plus retinal organoid model, single lab but multiple orthogonal methods\",\n      \"pmids\": [\"32753734\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2025,\n      \"finding\": \"Loss of Dync2h1 in NIH/3T3 fibroblasts (Dync2h1-KO) abolishes the production of a cilium-dependent wound-healing secretome; conditioned medium from Dync2h1-KO cells fails to enhance wound healing in primary cilium-deficient fibroblasts, whereas wild-type conditioned medium (enriched in LPC(14:0)) does, placing DYNC2H1-dependent ciliary function upstream of paracrine secretion of LPC(14:0) and ECM-remodeling signals.\",\n      \"method\": \"Dync2h1-KO cell line, conditioned medium transfer assay, fractionation, untargeted metabolomics, transcriptomic profiling\",\n      \"journal\": \"bioRxiv\",\n      \"confidence\": \"Low\",\n      \"confidence_rationale\": \"Tier 3 / Weak — preprint, single lab, indirect functional readout through conditioned medium, DYNC2H1-specific mechanistic contribution not directly isolated from general ciliary loss\",\n      \"pmids\": [\"bio_10.1101_2025.08.20.671189\"],\n      \"is_preprint\": true\n    }\n  ],\n  \"current_model\": \"DYNC2H1 encodes the heavy chain of cytoplasmic dynein-2, which functions as the motor for retrograde intraflagellar transport (IFT) in cilia—moving IFT raft particles and anterograde motors (kinesin-II) from the ciliary tip back to the cell body—thereby enabling ciliogenesis and ciliary Hedgehog signal transduction; loss-of-function mutations cause ciliary shortening, anterograde IFT protein accumulation at ciliary tips, and skeletal ciliopathies (Jeune syndrome/SRTD3), and hypomorphic variants impair dynein-2 motility and disrupt IFT88 distribution within cilia; additionally, DYNC2H1 participates in nuclear transport of the DNA repair proteins XPC and CBX5 in glioblastoma cells.\"\n}\n```","stage2_raw":"{\n  \"mechanistic_narrative\": \"DYNC2H1 encodes the heavy chain of cytoplasmic dynein-2, the motor that drives retrograde intraflagellar transport (IFT) in cilia and flagella [#0, #1]. Studies of the orthologous heavy chains in Chlamydomonas and C. elegans established that loss of this motor abolishes retrograde IFT while leaving anterograde transport intact, causing severely shortened cilia and redistribution of IFT raft components and the anterograde kinesin-II motor and its cargo into the ciliary compartment [#0, #1]. The protein is a cytoplasmic dynein isoform distinct from conventional dynein-1 and from axonemal dyneins, and its expression rises during ciliogenesis [#2]. By recycling IFT machinery from the ciliary tip, dynein-2 is required for normal cilium assembly and length, and it acts upstream of ciliary Hedgehog signal transduction [#5]. In humans, biallelic loss-of-function and hypomorphic DYNC2H1 mutations cause skeletal ciliopathies (asphyxiating thoracic dystrophy/short rib-polydactyly syndrome), with patient cells showing shortened cilia, abnormal microtubule architecture, and accumulation of anterograde IFT proteins such as IFT88 at ciliary tips—the diagnostic signature of a retrograde IFT defect [#3, #4]; missense mutations cluster in functional domains including the ATP motor domain, and hypomorphic variants directly impair dynein-2 motility in vitro [#4, #7]. A retina-predominant DYNC2H1 transcript exists whose selective disruption causes nonsyndromic inherited retinal degeneration [#7]. Beyond cilia, DYNC2H1 has been implicated in nuclear localization of the DNA repair proteins XPC and CBX5 in glioblastoma cells [#6].\",\n  \"teleology\": [\n    {\n      \"year\": 1999,\n      \"claim\": \"Established that the dynein-2 heavy chain is the dedicated retrograde IFT motor, resolving how IFT machinery returns from the ciliary tip while anterograde transport continues independently.\",\n      \"evidence\": \"Genetic deletion of DHC1b in Chlamydomonas with IFT particle redistribution assay and flagellar biochemical fractionation, plus live-animal IFT imaging of che-3 mutants in C. elegans\",\n      \"pmids\": [\"9971742\", \"10545497\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Did not resolve the molecular composition of the dynein-2 holocomplex or its regulatory subunits\", \"Mechanism of motor loading/unloading at the ciliary tip not addressed\"]\n    },\n    {\n      \"year\": 1996,\n      \"claim\": \"Defined DHC1b/DYNC2H1 as a distinct cytoplasmic dynein isoform separate from conventional dynein-1 and axonemal dyneins, and linked its expression to ciliogenesis.\",\n      \"evidence\": \"Isoform-specific antibody immunofluorescence and Western blot in cultured rat tracheal epithelial cells across ciliogenesis\",\n      \"pmids\": [\"8832411\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Reported cytoplasmic (non-ciliary) localization not reconciled with later retrograde IFT motor role\", \"Single-lab antibody-based localization\"]\n    },\n    {\n      \"year\": 2009,\n      \"claim\": \"Connected DYNC2H1 loss of function to a human skeletal ciliopathy, demonstrating that the motor is essential for cilium generation and maintenance in humans.\",\n      \"evidence\": \"Homozygosity mapping and Sanger sequencing in multiple families with patient-derived chondrocyte cilia/microtubule morphology analysis\",\n      \"pmids\": [\"19361615\", \"19442771\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Did not establish genotype-phenotype correlation across mutation types\", \"Mechanism linking ciliary defect to skeletal dysplasia not detailed\"]\n    },\n    {\n      \"year\": 2013,\n      \"claim\": \"Provided the cellular signature of the retrograde defect in patients and mapped mutations to the motor domain, confirming motor activity is the critical function.\",\n      \"evidence\": \"Exome sequencing, SNP mapping, and patient fibroblast immunofluorescence showing anterograde IFT protein (IFT88) accumulation at ciliary tips\",\n      \"pmids\": [\"23456818\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"No direct biochemical measurement of motor activity for the variants\", \"Single-lab cellular readout\"]\n    },\n    {\n      \"year\": 2015,\n      \"claim\": \"Placed DYNC2H1-dependent retrograde IFT upstream of ciliary Hedgehog signaling, linking the transport defect to a developmental signaling pathway.\",\n      \"evidence\": \"Maternal-zygotic dhc2 mutant medaka with ciliary phenotyping, Ptch1 ciliary immunolocalization, and Hh pathway gene expression\",\n      \"pmids\": [\"25645819\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Hh defects were partial; quantitative contribution of DYNC2H1 to Hh output unresolved\", \"Single model organism, single lab\"]\n    },\n    {\n      \"year\": 2019,\n      \"claim\": \"Implicated DYNC2H1 in a non-ciliary role—nuclear import of DNA repair proteins—underlying chemoresistance in glioblastoma.\",\n      \"evidence\": \"siRNA knockdown with subcellular proteomics, XPC/CBX5 localization imaging, and TMZ sensitivity assays in MGMT-deficient glioblastoma cells in vitro and in vivo\",\n      \"pmids\": [\"31347685\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Direct physical interaction of DYNC2H1 with XPC/CBX5 not established\", \"Mechanistic basis for a cytoplasmic dynein-2 heavy chain mediating nuclear transport unclear\", \"Single lab\"]\n    },\n    {\n      \"year\": 2020,\n      \"claim\": \"Directly demonstrated that hypomorphic variants impair dynein-2 motility and identified a tissue-specific transcript whose disruption causes isolated retinal disease, expanding the allelic and phenotypic spectrum.\",\n      \"evidence\": \"In vitro dynein motility reconstitution assay, fibroblast IFT88 cilia assay, iPSC-derived retinal organoids, and genome/exome sequencing\",\n      \"pmids\": [\"32753734\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Structural basis of motility impairment for specific variants not resolved\", \"Regulation of the retina-predominant transcript not characterized\"]\n    },\n    {\n      \"year\": 2025,\n      \"claim\": \"Linked DYNC2H1-dependent ciliary function to production of a paracrine wound-healing secretome, extending its role to intercellular signaling.\",\n      \"evidence\": \"Dync2h1-KO NIH/3T3 cells with conditioned medium transfer, fractionation, untargeted metabolomics, and transcriptomics (preprint)\",\n      \"pmids\": [\"bio_10.1101_2025.08.20.671189\"],\n      \"confidence\": \"Low\",\n      \"gaps\": [\"Preprint, single lab, not peer reviewed\", \"DYNC2H1-specific contribution not isolated from general loss of cilia\", \"Indirect readout through conditioned medium\"]\n    },\n    {\n      \"year\": null,\n      \"claim\": \"How DYNC2H1 might mediate nuclear transport of DNA repair proteins, mechanistically distinct from its retrograde IFT role, remains unexplained.\",\n      \"evidence\": \"\",\n      \"pmids\": [],\n      \"confidence\": \"Low\",\n      \"gaps\": [\"No structural model of dynein-2 with non-ciliary cargo\", \"No reciprocal physical-interaction validation for XPC/CBX5\", \"Tissue specificity of the non-ciliary role unclear\"]\n    }\n  ],\n  \"mechanism_profile\": {\n    \"molecular_activity\": [\n      {\"term_id\": \"GO:0140657\", \"supporting_discovery_ids\": [0, 7]},\n      {\"term_id\": \"GO:0003774\", \"supporting_discovery_ids\": [0, 1, 7]}\n    ],\n    \"localization\": [\n      {\"term_id\": \"GO:0005929\", \"supporting_discovery_ids\": [0, 4]},\n      {\"term_id\": \"GO:0005829\", \"supporting_discovery_ids\": [2]}\n    ],\n    \"pathway\": [\n      {\"term_id\": \"GO:0005856\", \"supporting_discovery_ids\": [0, 3]},\n      {\"term_id\": \"R-HSA-162582\", \"supporting_discovery_ids\": [5]},\n      {\"term_id\": \"R-HSA-1852241\", \"supporting_discovery_ids\": [0, 3]}\n    ],\n    \"complexes\": [\"cytoplasmic dynein-2\"],\n    \"partners\": [\"IFT88\"],\n    \"other_free_text\": []\n  }\n}","audit_flag":null,"evaluation":{"pairwise":"win","faith_supported":7,"faith_total":7,"faith_pct":100.0}}