{"gene":"DNAJC17","run_date":"2026-06-09T23:54:42","timeline":{"discoveries":[{"year":2018,"finding":"DNAJC17 localizes to nuclear speckles and physically interacts with spliceosomal/splicing machinery components, as validated by co-immunoprecipitation and in vivo co-localization with SC35 (a nuclear speckle marker). DNAJC17 up-regulation enhanced splicing efficiency in a minigene reporter assay, while its knockdown caused genome-wide perturbations in splicing efficiency detected by RNAseq.","method":"Co-immunoprecipitation, in vivo co-localization, minigene splicing reporter assay, transcriptomics (RNAseq), proteomics (interactome)","journal":"Scientific reports","confidence":"High","confidence_rationale":"Tier 2 / Strong — multiple orthogonal methods (Co-IP, co-localization, splicing reporter, RNAseq) in a single focused study establishing nuclear speckle localization and splicing function","pmids":["29773831"],"is_preprint":false},{"year":2023,"finding":"DNAJC17 is pan-essential in human cancer cell lines and allosterically activates ATP hydrolysis by HSP70 via its J-domain. The RNA recognition motif (RRM) exerts an auto-inhibitory effect on this J-domain-mediated HSP70 activation. The J-domain alone (without the RRM or C-terminal alpha helix) is sufficient to rescue cell viability after loss of endogenous DNAJC17. DNAJC17 knockdown causes exon skipping predominantly in genes involved in cell cycle progression, leading to deranged G2-M progression.","method":"Genetic screen (JDP library in human cancer cell lines), domain-deletion/rescue experiments, HSP70 ATPase activity assay, RNAseq exon-skipping analysis, cell viability assays","journal":"bioRxiv (preprint)","confidence":"High","confidence_rationale":"Tier 1-2 / Strong — multiple orthogonal methods (biochemical ATPase assay, domain mutagenesis/rescue, RNAseq splicing analysis, viability screen) in a single focused study; subsequently published in peer-reviewed journal","pmids":["37961102"],"is_preprint":true},{"year":2026,"finding":"DNAJC17 is pan-essential in human cancer cell lines; its RRM domain exerts an auto-inhibitory effect on J-domain-mediated allosteric activation of HSP70 ATP hydrolysis. The J-domain is required and sufficient to rescue cell viability and restore splicing and G2-M progression after endogenous DNAJC17 loss, while the RRM and C-terminal alpha helix are dispensable for these functions. Knockdown predominantly causes exon skipping in cell-cycle genes rather than broad mRNA abundance changes.","method":"Genetic screen, domain-deletion rescue experiments, HSP70 ATPase activity assay (in vitro biochemical assay), RNAseq exon-skipping analysis, cell viability assays","journal":"Scientific reports","confidence":"High","confidence_rationale":"Tier 1-2 / Strong — peer-reviewed publication with in vitro ATPase assay, domain mutagenesis, RNAseq, and viability rescue experiments; replicates and extends the preprint findings","pmids":["42156896"],"is_preprint":false},{"year":2010,"finding":"Mouse Dnajc17, a type III Hsp40 family member, is highly expressed in the thyroid bud and is essential for early development; knockout mouse embryos die prior to implantation. A nonsynonymous SNP in a conserved region of Dnajc17 was identified as a strain-specific modifier of congenital hypothyroidism in mice heterozygous for Nkx2-1/Titf1 and Pax8 null mutations.","method":"Chromosomal mapping, SNP analysis, expression profiling (thyroid bud), knockout mouse (lethal phenotype)","journal":"Endocrinology","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — knockout developmental phenotype and SNP-based modifier mapping in mouse, two orthogonal approaches, single lab","pmids":["20160132"],"is_preprint":false},{"year":2008,"finding":"The Ciona intestinalis orthologue of DNAJC17 (Ci-FLJ10634, encoding a J-protein family member) acts upstream of or parallel to beta-catenin in the canonical Wnt/beta-catenin signaling pathway during early embryogenesis. Morpholino-mediated knockdown suppressed beta-catenin downstream targets (Ci-FoxD, Ci-Lhx3, Ci-Otx, Ci-Fgf9/16/20) and endoderm formation; defects were rescued by constitutively active but not wild-type Ci-beta-catenin, and dosage-sensitive interactions were found.","method":"Morpholino knockdown, epistasis (rescue with constitutively active beta-catenin), downstream target gene expression analysis in Ciona embryos","journal":"Development, growth & differentiation","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — epistasis via rescue experiments and dosage-sensitive interactions established, but in an invertebrate (Ciona) orthologue context; single lab","pmids":["18336583"],"is_preprint":false},{"year":2025,"finding":"Spliceosome-associated DNAJC17 retains TDP-43 in the nucleus and promotes its liquid-phase behavior in human cells, reducing TDP-43 aggregate burden under proteotoxic stress and enhancing cell viability. DNAJC17 was identified as acting independently of HSP70 (unlike most DNAJB family members) in suppressing TDP-43 toxicity.","method":"Systematic overexpression screen of Hsp70 network members, TDP-43 aggregation assays, nuclear localization and phase behavior imaging, viability assays in human cells","journal":"bioRxiv","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — multiple functional readouts (aggregation, localization, viability) in human cells, preprint, single lab","pmids":["40654997"],"is_preprint":true},{"year":2017,"finding":"Screening of 89 patients with thyroid dysgenesis identified two DNAJC17 coding variants (c.350A>C and c.610G>C); their allele frequencies were not significantly different from controls, providing no evidence that DNAJC17 coding mutations are a frequent cause of thyroid dysgenesis in humans.","method":"High-resolution melting analysis (HRM) and direct sequencing of DNAJC17 coding sequence in patient cohort","journal":"Journal of endocrinological investigation","confidence":"Low","confidence_rationale":"Tier 3 / Weak — negative/null genetic association result in a single cohort; establishes that common DNAJC17 coding variants are not a frequent cause of thyroid dysgenesis","pmids":["29159607"],"is_preprint":false}],"current_model":"DNAJC17 is a pan-essential HSP40/J-domain protein that localizes to nuclear speckles and functions as a co-chaperone for HSP70, with its J-domain allosterically activating HSP70 ATP hydrolysis while its RNA recognition motif (RRM) exerts an auto-inhibitory effect on this activity; its primary cellular role is to support spliceosomal function—physically interacting with splicing machinery components—such that its loss causes widespread exon skipping in cell-cycle genes, deranged G2-M progression, and lethality, and it additionally retains the RNA-binding protein TDP-43 in the nucleus to suppress its cytoplasmic aggregation."},"narrative":{"mechanistic_narrative":"DNAJC17 is a pan-essential HSP40/J-domain co-chaperone that links the HSP70 chaperone system to nuclear pre-mRNA splicing [PMID:37961102, PMID:29773831]. It localizes to nuclear speckles and physically associates with spliceosomal/splicing machinery components, where it supports splicing efficiency [PMID:29773831]. Its J-domain allosterically activates ATP hydrolysis by HSP70, while its RNA recognition motif (RRM) imposes an auto-inhibitory constraint on this activation; the J-domain alone is both required and sufficient to rescue viability, splicing, and G2-M progression after loss of endogenous protein, whereas the RRM and C-terminal alpha helix are dispensable [PMID:37961102, PMID:42156896]. Loss of DNAJC17 causes exon skipping concentrated in cell-cycle genes rather than broad changes in mRNA abundance, deranging G2-M progression and producing cell lethality [PMID:42156896]. The protein additionally retains the RNA-binding protein TDP-43 in the nucleus and promotes its liquid-phase behavior, reducing TDP-43 aggregate burden under proteotoxic stress through an HSP70-independent route [PMID:40654997]. In mouse, Dnajc17 is essential for early development, with knockout embryos dying before implantation [PMID:20160132].","teleology":[{"year":2008,"claim":"Established the first developmental function for a DNAJC17 orthologue by placing it within canonical Wnt/beta-catenin signaling during early embryogenesis, addressing whether this J-protein had a defined pathway role.","evidence":"Morpholino knockdown with beta-catenin epistasis/rescue and downstream target analysis in Ciona intestinalis embryos","pmids":["18336583"],"confidence":"Medium","gaps":["Invertebrate orthologue context; relevance to vertebrate/human DNAJC17 unconfirmed","Molecular mechanism by which the J-protein acts on Wnt signaling not defined","No biochemical link to HSP70 or splicing established here"]},{"year":2010,"claim":"Showed that mammalian Dnajc17 is essential for early development and a genetic modifier of thyroid phenotypes, establishing organismal requirement before any molecular mechanism was known.","evidence":"Knockout mouse (pre-implantation lethality), thyroid bud expression profiling, and SNP-based modifier mapping of congenital hypothyroidism","pmids":["20160132"],"confidence":"Medium","gaps":["Lethality precludes definition of tissue-specific function","Mechanism connecting Dnajc17 to thyroid gene-dosage phenotypes unknown","No molecular activity assigned"]},{"year":2017,"claim":"Tested whether DNAJC17 coding mutations cause human thyroid dysgenesis, addressing the clinical relevance of the mouse modifier findings.","evidence":"HRM and direct sequencing of DNAJC17 coding region in 89 thyroid dysgenesis patients versus controls","pmids":["29159607"],"confidence":"Low","gaps":["Negative/null association in a single small cohort; does not exclude rare or regulatory variants","No functional testing of the identified variants","Cohort size limits statistical power"]},{"year":2018,"claim":"Defined a molecular function for DNAJC17 by localizing it to nuclear speckles and tying it to the splicing machinery, the first direct evidence for a role in pre-mRNA splicing.","evidence":"Co-IP, in vivo co-localization with SC35, minigene splicing reporter, and RNAseq upon knockdown in human cells","pmids":["29773831"],"confidence":"High","gaps":["Specific spliceosomal subcomplex/contacts not resolved","Mechanistic link between speckle localization and splicing outcomes undefined","No connection to chaperone activity made at this stage"]},{"year":2023,"claim":"Unified the chaperone and splicing roles by showing DNAJC17 is pan-essential, that its J-domain activates HSP70 ATPase activity, that the RRM auto-inhibits this activity, and that the J-domain alone suffices for viability.","evidence":"JDP-library genetic screen, domain-deletion/rescue, in vitro HSP70 ATPase assay, and RNAseq exon-skipping analysis in human cancer cell lines (preprint)","pmids":["37961102"],"confidence":"High","gaps":["Identity of client proteins handed to HSP70 not determined","How J-domain/HSP70 activity mechanistically promotes correct splicing unresolved","Structural basis of RRM auto-inhibition not defined"]},{"year":2025,"claim":"Extended DNAJC17 function to proteostasis of an aggregation-prone RNA-binding protein, showing it retains TDP-43 in the nucleus and suppresses its aggregation independently of HSP70.","evidence":"Systematic overexpression screen of the HSP70 network, TDP-43 aggregation/localization/phase-behavior imaging, and viability assays in human cells (preprint)","pmids":["40654997"],"confidence":"Medium","gaps":["Single-lab preprint; reciprocal/independent validation pending","Molecular basis of HSP70-independent TDP-43 retention undefined","Relationship to the J-domain/RRM mechanism not established"]},{"year":2026,"claim":"Confirmed and extended the domain-function model in peer review, establishing that the J-domain is required and sufficient to rescue viability, splicing, and G2-M progression while the RRM and C-terminal helix are dispensable.","evidence":"Genetic screen, domain-deletion rescue, in vitro HSP70 ATPase assay, RNAseq exon-skipping, and viability assays in human cancer cell lines","pmids":["42156896"],"confidence":"High","gaps":["Functional role of the auto-inhibitory RRM in vivo unclear given its dispensability for rescue","Direct HSP70 clients during splicing not identified","Mechanism coupling chaperone activity to exon inclusion unresolved"]},{"year":null,"claim":"How HSP70 chaperone activity is mechanistically coupled to correct spliceosome function, and what client proteins DNAJC17 delivers, remain undefined.","evidence":"","pmids":[],"confidence":"High","gaps":["No HSP70 clients of DNAJC17 identified","Structural basis of RRM auto-inhibition and J-domain/HSP70 engagement not solved","Reconciliation of essential splicing role with HSP70-independent TDP-43 retention not established"]}],"mechanism_profile":{"molecular_activity":[{"term_id":"GO:0140096","term_label":"catalytic activity, acting on a protein","supporting_discovery_ids":[1,2]},{"term_id":"GO:0098772","term_label":"molecular function regulator activity","supporting_discovery_ids":[1,2]},{"term_id":"GO:0003723","term_label":"RNA binding","supporting_discovery_ids":[0,5]}],"localization":[{"term_id":"GO:0005654","term_label":"nucleoplasm","supporting_discovery_ids":[0]},{"term_id":"GO:0005634","term_label":"nucleus","supporting_discovery_ids":[0,5]}],"pathway":[{"term_id":"R-HSA-8953854","term_label":"Metabolism of RNA","supporting_discovery_ids":[0,2]},{"term_id":"R-HSA-392499","term_label":"Metabolism of proteins","supporting_discovery_ids":[1,2]},{"term_id":"R-HSA-1640170","term_label":"Cell Cycle","supporting_discovery_ids":[2]}],"complexes":[],"partners":["HSPA1A","TARDBP"],"other_free_text":[]}},"prefetch_data":{"uniprot":{"accession":"Q9NVM6","full_name":"DnaJ homolog subfamily C member 17","aliases":[],"length_aa":304,"mass_kda":34.7,"function":"May negatively affect PAX8-induced thyroglobulin/TG transcription","subcellular_location":"Cytoplasm; Nucleus","url":"https://www.uniprot.org/uniprotkb/Q9NVM6/entry"},"depmap":{"release":"DepMap","has_data":true,"is_common_essential":true,"resolved_as":"","url":"https://depmap.org/portal/gene/DNAJC17","classification":"Common Essential","n_dependent_lines":1203,"n_total_lines":1208,"dependency_fraction":0.9958609271523179},"opencell":{"profiled":true,"resolved_as":"","ensg_id":"ENSG00000104129","cell_line_id":"CID000026","localizations":[{"compartment":"nucleoplasm","grade":3}],"interactors":[{"gene":"CRNKL1","stoichiometry":0.2},{"gene":"CWF19L1","stoichiometry":0.2},{"gene":"EFTUD2","stoichiometry":0.2},{"gene":"XAB2","stoichiometry":0.2},{"gene":"ISY1","stoichiometry":0.2},{"gene":"PRPF19","stoichiometry":0.2},{"gene":"STUB1","stoichiometry":0.2},{"gene":"CDC5L","stoichiometry":0.2},{"gene":"AHSA1","stoichiometry":0.2},{"gene":"SNRNP200","stoichiometry":0.2}],"url":"https://opencell.sf.czbiohub.org/target/CID000026","total_profiled":1310},"omim":[{"mim_id":"616844","title":"DNAJ/HSP40 HOMOLOG, SUBFAMILY C, MEMBER 17; DNAJC17","url":"https://www.omim.org/entry/616844"}],"hpa":{"profiled":true,"resolved_as":"","reliability":"Approved","locations":[{"location":"Nucleoplasm","reliability":"Approved"}],"tissue_specificity":"Low tissue specificity","tissue_distribution":"Detected in all","driving_tissues":[],"url":"https://www.proteinatlas.org/search/DNAJC17"},"hgnc":{"alias_symbol":["FLJ10634"],"prev_symbol":[]},"alphafold":{"accession":"Q9NVM6","domains":[{"cath_id":"1.10.287.110","chopping":"4-64","consensus_level":"high","plddt":89.3279,"start":4,"end":64},{"cath_id":"3.30.70.330","chopping":"171-247","consensus_level":"high","plddt":86.2814,"start":171,"end":247}],"viewer_url":"https://alphafold.ebi.ac.uk/entry/Q9NVM6","model_url":"https://alphafold.ebi.ac.uk/files/AF-Q9NVM6-F1-model_v6.cif","pae_url":"https://alphafold.ebi.ac.uk/files/AF-Q9NVM6-F1-predicted_aligned_error_v6.png","plddt_mean":83.0},"mouse_models":{"mgi_url":"https://www.informatics.jax.org/marker/summary?nomen=DNAJC17","jax_strain_url":"https://www.jax.org/strain/search?query=DNAJC17"},"sequence":{"accession":"Q9NVM6","fasta_url":"https://rest.uniprot.org/uniprotkb/Q9NVM6.fasta","uniprot_url":"https://www.uniprot.org/uniprotkb/Q9NVM6/entry","alphafold_viewer_url":"https://alphafold.ebi.ac.uk/entry/Q9NVM6"}},"corpus_meta":[{"pmid":"26355662","id":"PMC_26355662","title":"Expanding the clinical, allelic, and locus heterogeneity of retinal dystrophies.","date":"2015","source":"Genetics in medicine : official journal of the American College of Medical Genetics","url":"https://pubmed.ncbi.nlm.nih.gov/26355662","citation_count":99,"is_preprint":false},{"pmid":"24007566","id":"PMC_24007566","title":"Evidence for differential alternative splicing in blood of young boys with autism spectrum disorders.","date":"2013","source":"Molecular autism","url":"https://pubmed.ncbi.nlm.nih.gov/24007566","citation_count":58,"is_preprint":false},{"pmid":"20872835","id":"PMC_20872835","title":"Colitis locus on chromosome 2 impacting the severity of early-onset disease in mice deficient in GPX1 and GPX2.","date":"2010","source":"Inflammatory bowel diseases","url":"https://pubmed.ncbi.nlm.nih.gov/20872835","citation_count":29,"is_preprint":false},{"pmid":"35962451","id":"PMC_35962451","title":"Identification of LARS as an essential gene for osteosarcoma proliferation through large-Scale CRISPR-Cas9 screening database and experimental verification.","date":"2022","source":"Journal of translational medicine","url":"https://pubmed.ncbi.nlm.nih.gov/35962451","citation_count":19,"is_preprint":false},{"pmid":"29773831","id":"PMC_29773831","title":"DNAJC17 is localized in nuclear speckles and interacts with splicing machinery components.","date":"2018","source":"Scientific reports","url":"https://pubmed.ncbi.nlm.nih.gov/29773831","citation_count":16,"is_preprint":false},{"pmid":"36739730","id":"PMC_36739730","title":"Genome-scale CRISPR-Cas9 knockout screening in nasopharyngeal carcinoma for radiosensitive and radioresistant genes.","date":"2023","source":"Translational oncology","url":"https://pubmed.ncbi.nlm.nih.gov/36739730","citation_count":15,"is_preprint":false},{"pmid":"20160132","id":"PMC_20160132","title":"A locus on mouse chromosome 2 is involved in susceptibility to congenital hypothyroidism and contains an essential gene expressed in thyroid.","date":"2010","source":"Endocrinology","url":"https://pubmed.ncbi.nlm.nih.gov/20160132","citation_count":15,"is_preprint":false},{"pmid":"18336583","id":"PMC_18336583","title":"Novel genes involved in canonical Wnt/beta-catenin signaling pathway in early Ciona intestinalis embryos.","date":"2008","source":"Development, growth & differentiation","url":"https://pubmed.ncbi.nlm.nih.gov/18336583","citation_count":15,"is_preprint":false},{"pmid":"38203295","id":"PMC_38203295","title":"Genome-Wide Association Analysis of Heat Tolerance in F2 Progeny from the Hybridization between Two Congeneric Oyster Species.","date":"2023","source":"International journal of molecular sciences","url":"https://pubmed.ncbi.nlm.nih.gov/38203295","citation_count":10,"is_preprint":false},{"pmid":"33747556","id":"PMC_33747556","title":"Aflibercept Intervention in Experimental Branch Retinal Vein Occlusion Results in Upregulation of DnaJ Homolog Subfamily C Member 17.","date":"2021","source":"Journal of ophthalmology","url":"https://pubmed.ncbi.nlm.nih.gov/33747556","citation_count":6,"is_preprint":false},{"pmid":"29159607","id":"PMC_29159607","title":"High-resolution melting analysis (HRM) for mutational screening of Dnajc17 gene in patients affected by thyroid dysgenesis.","date":"2017","source":"Journal of endocrinological investigation","url":"https://pubmed.ncbi.nlm.nih.gov/29159607","citation_count":4,"is_preprint":false},{"pmid":"40654997","id":"PMC_40654997","title":"Scouring the human Hsp70 network uncovers diverse chaperone safeguards buffering TDP-43 toxicity.","date":"2025","source":"bioRxiv : the preprint server for biology","url":"https://pubmed.ncbi.nlm.nih.gov/40654997","citation_count":2,"is_preprint":false},{"pmid":"37961102","id":"PMC_37961102","title":"The essential chaperone DNAJC17 activates HSP70 to coordinate RNA splicing and G2-M progression.","date":"2023","source":"bioRxiv : the preprint server for biology","url":"https://pubmed.ncbi.nlm.nih.gov/37961102","citation_count":1,"is_preprint":false},{"pmid":"42156896","id":"PMC_42156896","title":"The essential chaperone DNAJC17 activates HSP70 to coordinate RNA splicing and G2-M progression.","date":"2026","source":"Scientific reports","url":"https://pubmed.ncbi.nlm.nih.gov/42156896","citation_count":1,"is_preprint":false}],"cost":{"stage1":{"model":"claude-sonnet-4-6","input_tokens":9740,"output_tokens":2102,"usd":0.030375,"stage1_stop_reason":"end_turn"},"stage2":{"model":"claude-opus-4-8","input_tokens":9106,"output_tokens":2959,"usd":0.059753,"stage2_stop_reason":"end_turn"},"total_usd":0.090128,"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\": 2018,\n      \"finding\": \"DNAJC17 localizes to nuclear speckles and physically interacts with spliceosomal/splicing machinery components, as validated by co-immunoprecipitation and in vivo co-localization with SC35 (a nuclear speckle marker). DNAJC17 up-regulation enhanced splicing efficiency in a minigene reporter assay, while its knockdown caused genome-wide perturbations in splicing efficiency detected by RNAseq.\",\n      \"method\": \"Co-immunoprecipitation, in vivo co-localization, minigene splicing reporter assay, transcriptomics (RNAseq), proteomics (interactome)\",\n      \"journal\": \"Scientific reports\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — multiple orthogonal methods (Co-IP, co-localization, splicing reporter, RNAseq) in a single focused study establishing nuclear speckle localization and splicing function\",\n      \"pmids\": [\"29773831\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2023,\n      \"finding\": \"DNAJC17 is pan-essential in human cancer cell lines and allosterically activates ATP hydrolysis by HSP70 via its J-domain. The RNA recognition motif (RRM) exerts an auto-inhibitory effect on this J-domain-mediated HSP70 activation. The J-domain alone (without the RRM or C-terminal alpha helix) is sufficient to rescue cell viability after loss of endogenous DNAJC17. DNAJC17 knockdown causes exon skipping predominantly in genes involved in cell cycle progression, leading to deranged G2-M progression.\",\n      \"method\": \"Genetic screen (JDP library in human cancer cell lines), domain-deletion/rescue experiments, HSP70 ATPase activity assay, RNAseq exon-skipping analysis, cell viability assays\",\n      \"journal\": \"bioRxiv (preprint)\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1-2 / Strong — multiple orthogonal methods (biochemical ATPase assay, domain mutagenesis/rescue, RNAseq splicing analysis, viability screen) in a single focused study; subsequently published in peer-reviewed journal\",\n      \"pmids\": [\"37961102\"],\n      \"is_preprint\": true\n    },\n    {\n      \"year\": 2026,\n      \"finding\": \"DNAJC17 is pan-essential in human cancer cell lines; its RRM domain exerts an auto-inhibitory effect on J-domain-mediated allosteric activation of HSP70 ATP hydrolysis. The J-domain is required and sufficient to rescue cell viability and restore splicing and G2-M progression after endogenous DNAJC17 loss, while the RRM and C-terminal alpha helix are dispensable for these functions. Knockdown predominantly causes exon skipping in cell-cycle genes rather than broad mRNA abundance changes.\",\n      \"method\": \"Genetic screen, domain-deletion rescue experiments, HSP70 ATPase activity assay (in vitro biochemical assay), RNAseq exon-skipping analysis, cell viability assays\",\n      \"journal\": \"Scientific reports\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1-2 / Strong — peer-reviewed publication with in vitro ATPase assay, domain mutagenesis, RNAseq, and viability rescue experiments; replicates and extends the preprint findings\",\n      \"pmids\": [\"42156896\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2010,\n      \"finding\": \"Mouse Dnajc17, a type III Hsp40 family member, is highly expressed in the thyroid bud and is essential for early development; knockout mouse embryos die prior to implantation. A nonsynonymous SNP in a conserved region of Dnajc17 was identified as a strain-specific modifier of congenital hypothyroidism in mice heterozygous for Nkx2-1/Titf1 and Pax8 null mutations.\",\n      \"method\": \"Chromosomal mapping, SNP analysis, expression profiling (thyroid bud), knockout mouse (lethal phenotype)\",\n      \"journal\": \"Endocrinology\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — knockout developmental phenotype and SNP-based modifier mapping in mouse, two orthogonal approaches, single lab\",\n      \"pmids\": [\"20160132\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2008,\n      \"finding\": \"The Ciona intestinalis orthologue of DNAJC17 (Ci-FLJ10634, encoding a J-protein family member) acts upstream of or parallel to beta-catenin in the canonical Wnt/beta-catenin signaling pathway during early embryogenesis. Morpholino-mediated knockdown suppressed beta-catenin downstream targets (Ci-FoxD, Ci-Lhx3, Ci-Otx, Ci-Fgf9/16/20) and endoderm formation; defects were rescued by constitutively active but not wild-type Ci-beta-catenin, and dosage-sensitive interactions were found.\",\n      \"method\": \"Morpholino knockdown, epistasis (rescue with constitutively active beta-catenin), downstream target gene expression analysis in Ciona embryos\",\n      \"journal\": \"Development, growth & differentiation\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — epistasis via rescue experiments and dosage-sensitive interactions established, but in an invertebrate (Ciona) orthologue context; single lab\",\n      \"pmids\": [\"18336583\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2025,\n      \"finding\": \"Spliceosome-associated DNAJC17 retains TDP-43 in the nucleus and promotes its liquid-phase behavior in human cells, reducing TDP-43 aggregate burden under proteotoxic stress and enhancing cell viability. DNAJC17 was identified as acting independently of HSP70 (unlike most DNAJB family members) in suppressing TDP-43 toxicity.\",\n      \"method\": \"Systematic overexpression screen of Hsp70 network members, TDP-43 aggregation assays, nuclear localization and phase behavior imaging, viability assays in human cells\",\n      \"journal\": \"bioRxiv\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — multiple functional readouts (aggregation, localization, viability) in human cells, preprint, single lab\",\n      \"pmids\": [\"40654997\"],\n      \"is_preprint\": true\n    },\n    {\n      \"year\": 2017,\n      \"finding\": \"Screening of 89 patients with thyroid dysgenesis identified two DNAJC17 coding variants (c.350A>C and c.610G>C); their allele frequencies were not significantly different from controls, providing no evidence that DNAJC17 coding mutations are a frequent cause of thyroid dysgenesis in humans.\",\n      \"method\": \"High-resolution melting analysis (HRM) and direct sequencing of DNAJC17 coding sequence in patient cohort\",\n      \"journal\": \"Journal of endocrinological investigation\",\n      \"confidence\": \"Low\",\n      \"confidence_rationale\": \"Tier 3 / Weak — negative/null genetic association result in a single cohort; establishes that common DNAJC17 coding variants are not a frequent cause of thyroid dysgenesis\",\n      \"pmids\": [\"29159607\"],\n      \"is_preprint\": false\n    }\n  ],\n  \"current_model\": \"DNAJC17 is a pan-essential HSP40/J-domain protein that localizes to nuclear speckles and functions as a co-chaperone for HSP70, with its J-domain allosterically activating HSP70 ATP hydrolysis while its RNA recognition motif (RRM) exerts an auto-inhibitory effect on this activity; its primary cellular role is to support spliceosomal function—physically interacting with splicing machinery components—such that its loss causes widespread exon skipping in cell-cycle genes, deranged G2-M progression, and lethality, and it additionally retains the RNA-binding protein TDP-43 in the nucleus to suppress its cytoplasmic aggregation.\"\n}\n```","stage2_raw":"{\n  \"mechanistic_narrative\": \"DNAJC17 is a pan-essential HSP40/J-domain co-chaperone that links the HSP70 chaperone system to nuclear pre-mRNA splicing [#1, #0]. It localizes to nuclear speckles and physically associates with spliceosomal/splicing machinery components, where it supports splicing efficiency [#0]. Its J-domain allosterically activates ATP hydrolysis by HSP70, while its RNA recognition motif (RRM) imposes an auto-inhibitory constraint on this activation; the J-domain alone is both required and sufficient to rescue viability, splicing, and G2-M progression after loss of endogenous protein, whereas the RRM and C-terminal alpha helix are dispensable [#1, #2]. Loss of DNAJC17 causes exon skipping concentrated in cell-cycle genes rather than broad changes in mRNA abundance, deranging G2-M progression and producing cell lethality [#2]. The protein additionally retains the RNA-binding protein TDP-43 in the nucleus and promotes its liquid-phase behavior, reducing TDP-43 aggregate burden under proteotoxic stress through an HSP70-independent route [#5]. In mouse, Dnajc17 is essential for early development, with knockout embryos dying before implantation [#3].\",\n  \"teleology\": [\n    {\n      \"year\": 2008,\n      \"claim\": \"Established the first developmental function for a DNAJC17 orthologue by placing it within canonical Wnt/beta-catenin signaling during early embryogenesis, addressing whether this J-protein had a defined pathway role.\",\n      \"evidence\": \"Morpholino knockdown with beta-catenin epistasis/rescue and downstream target analysis in Ciona intestinalis embryos\",\n      \"pmids\": [\"18336583\"],\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"\",\n      \"gaps\": [\"Invertebrate orthologue context; relevance to vertebrate/human DNAJC17 unconfirmed\", \"Molecular mechanism by which the J-protein acts on Wnt signaling not defined\", \"No biochemical link to HSP70 or splicing established here\"]\n    },\n    {\n      \"year\": 2010,\n      \"claim\": \"Showed that mammalian Dnajc17 is essential for early development and a genetic modifier of thyroid phenotypes, establishing organismal requirement before any molecular mechanism was known.\",\n      \"evidence\": \"Knockout mouse (pre-implantation lethality), thyroid bud expression profiling, and SNP-based modifier mapping of congenital hypothyroidism\",\n      \"pmids\": [\"20160132\"],\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"\",\n      \"gaps\": [\"Lethality precludes definition of tissue-specific function\", \"Mechanism connecting Dnajc17 to thyroid gene-dosage phenotypes unknown\", \"No molecular activity assigned\"]\n    },\n    {\n      \"year\": 2017,\n      \"claim\": \"Tested whether DNAJC17 coding mutations cause human thyroid dysgenesis, addressing the clinical relevance of the mouse modifier findings.\",\n      \"evidence\": \"HRM and direct sequencing of DNAJC17 coding region in 89 thyroid dysgenesis patients versus controls\",\n      \"pmids\": [\"29159607\"],\n      \"confidence\": \"Low\",\n      \"confidence_rationale\": \"\",\n      \"gaps\": [\"Negative/null association in a single small cohort; does not exclude rare or regulatory variants\", \"No functional testing of the identified variants\", \"Cohort size limits statistical power\"]\n    },\n    {\n      \"year\": 2018,\n      \"claim\": \"Defined a molecular function for DNAJC17 by localizing it to nuclear speckles and tying it to the splicing machinery, the first direct evidence for a role in pre-mRNA splicing.\",\n      \"evidence\": \"Co-IP, in vivo co-localization with SC35, minigene splicing reporter, and RNAseq upon knockdown in human cells\",\n      \"pmids\": [\"29773831\"],\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"\",\n      \"gaps\": [\"Specific spliceosomal subcomplex/contacts not resolved\", \"Mechanistic link between speckle localization and splicing outcomes undefined\", \"No connection to chaperone activity made at this stage\"]\n    },\n    {\n      \"year\": 2023,\n      \"claim\": \"Unified the chaperone and splicing roles by showing DNAJC17 is pan-essential, that its J-domain activates HSP70 ATPase activity, that the RRM auto-inhibits this activity, and that the J-domain alone suffices for viability.\",\n      \"evidence\": \"JDP-library genetic screen, domain-deletion/rescue, in vitro HSP70 ATPase assay, and RNAseq exon-skipping analysis in human cancer cell lines (preprint)\",\n      \"pmids\": [\"37961102\"],\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"\",\n      \"gaps\": [\"Identity of client proteins handed to HSP70 not determined\", \"How J-domain/HSP70 activity mechanistically promotes correct splicing unresolved\", \"Structural basis of RRM auto-inhibition not defined\"]\n    },\n    {\n      \"year\": 2025,\n      \"claim\": \"Extended DNAJC17 function to proteostasis of an aggregation-prone RNA-binding protein, showing it retains TDP-43 in the nucleus and suppresses its aggregation independently of HSP70.\",\n      \"evidence\": \"Systematic overexpression screen of the HSP70 network, TDP-43 aggregation/localization/phase-behavior imaging, and viability assays in human cells (preprint)\",\n      \"pmids\": [\"40654997\"],\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"\",\n      \"gaps\": [\"Single-lab preprint; reciprocal/independent validation pending\", \"Molecular basis of HSP70-independent TDP-43 retention undefined\", \"Relationship to the J-domain/RRM mechanism not established\"]\n    },\n    {\n      \"year\": 2026,\n      \"claim\": \"Confirmed and extended the domain-function model in peer review, establishing that the J-domain is required and sufficient to rescue viability, splicing, and G2-M progression while the RRM and C-terminal helix are dispensable.\",\n      \"evidence\": \"Genetic screen, domain-deletion rescue, in vitro HSP70 ATPase assay, RNAseq exon-skipping, and viability assays in human cancer cell lines\",\n      \"pmids\": [\"42156896\"],\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"\",\n      \"gaps\": [\"Functional role of the auto-inhibitory RRM in vivo unclear given its dispensability for rescue\", \"Direct HSP70 clients during splicing not identified\", \"Mechanism coupling chaperone activity to exon inclusion unresolved\"]\n    },\n    {\n      \"year\": null,\n      \"claim\": \"How HSP70 chaperone activity is mechanistically coupled to correct spliceosome function, and what client proteins DNAJC17 delivers, remain undefined.\",\n      \"evidence\": \"\",\n      \"pmids\": [],\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"\",\n      \"gaps\": [\"No HSP70 clients of DNAJC17 identified\", \"Structural basis of RRM auto-inhibition and J-domain/HSP70 engagement not solved\", \"Reconciliation of essential splicing role with HSP70-independent TDP-43 retention not established\"]\n    }\n  ],\n  \"mechanism_profile\": {\n    \"molecular_activity\": [\n      {\"term_id\": \"GO:0140096\", \"supporting_discovery_ids\": [1, 2]},\n      {\"term_id\": \"GO:0098772\", \"supporting_discovery_ids\": [1, 2]},\n      {\"term_id\": \"GO:0003723\", \"supporting_discovery_ids\": [0, 5]}\n    ],\n    \"localization\": [\n      {\"term_id\": \"GO:0005654\", \"supporting_discovery_ids\": [0]},\n      {\"term_id\": \"GO:0005634\", \"supporting_discovery_ids\": [0, 5]}\n    ],\n    \"pathway\": [\n      {\"term_id\": \"R-HSA-8953854\", \"supporting_discovery_ids\": [0, 2]},\n      {\"term_id\": \"R-HSA-392499\", \"supporting_discovery_ids\": [1, 2]},\n      {\"term_id\": \"R-HSA-1640170\", \"supporting_discovery_ids\": [2]}\n    ],\n    \"complexes\": [],\n    \"partners\": [\"HSPA1A\", \"TARDBP\"],\n    \"other_free_text\": []\n  }\n}","audit_flag":null,"evaluation":{"pairwise":"win","faith_supported":6,"faith_total":6,"faith_pct":100.0}}