{"gene":"DNAJB1","run_date":"2026-06-09T23:54:42","timeline":{"discoveries":[{"year":2014,"finding":"A ~400-kilobase deletion on chromosome 19 fuses DNAJB1 exon 1 in-frame with PRKACA (catalytic subunit of PKA), generating a chimeric DNAJB1-PRKACA protein detected by immunoprecipitation and Western blot in fibrolamellar hepatocellular carcinoma (FL-HCC) tumor tissue; the fusion protein retains kinase activity in a cell culture assay.","method":"Immunoprecipitation, Western blot, cell culture kinase assay, RNA sequencing","journal":"Science","confidence":"High","confidence_rationale":"Tier 2 / Strong — reciprocal IP, kinase activity assay, replicated in 15/15 tumors; independently confirmed by multiple subsequent studies","pmids":["24578576"],"is_preprint":false},{"year":2017,"finding":"Expression of the DNAJB1-PRKACA fusion protein (via CRISPR-Cas9 or transposon-mediated gene transfer) is sufficient to drive liver tumor formation in mice resembling human FL-HCC; overexpression of wild-type PRKACA alone does not fully recapitulate the oncogenic activity, indicating the DNAJB1 portion contributes to oncogenesis beyond mere PRKACA overexpression. The fusion kinase interacts with β-catenin, and tumorigenesis is enhanced by genetic Wnt pathway activation.","method":"CRISPR-Cas9 genome editing, transposon-mediated somatic gene transfer, mouse tumor models, Co-IP for β-catenin interaction","journal":"Proceedings of the National Academy of Sciences of the United States of America","confidence":"High","confidence_rationale":"Tier 2 / Strong — two independent in vivo engineering approaches in the same study, replicated by a second independent CRISPR study (PMID 28923495)","pmids":["29162699","28923495"],"is_preprint":false},{"year":1997,"finding":"Human Hsp40 (DNAJB1) acts as a co-chaperone for Hsp70 in mammalian cells: Hsp40 alone does not protect luciferase from heat inactivation and slightly increases heat sensitivity, but when co-expressed with human Hsp70, it accelerates luciferase reactivation from the heat-inactivated state. This Hsp40/Hsp70 chaperone activity operates in both cytoplasm and nucleus.","method":"Co-transfection in hamster fibroblasts, luciferase heat-inactivation and reactivation assays, subcellular-targeted luciferase constructs","journal":"The Journal of biological chemistry","confidence":"High","confidence_rationale":"Tier 2 / Strong — clean functional in vivo assay with compartment-specific constructs, replicated conceptually across multiple labs","pmids":["9407119"],"is_preprint":false},{"year":2020,"finding":"DNAJB1 (Hdj1) phase-separates into ubiquitin-rich nuclear bodies under basal conditions and into stress granules upon stress; this phase separation is driven by its G/F-rich region. Mutations in the G/F region impair Hdj1 phase separation and its incorporation into stress granules, and abrogate co-phase separation with FUS. Co-phase separation of Hdj1 with FUS stabilizes the liquid phase of FUS against amyloid aggregation in vitro and reduces abnormal FUS aggregation in cells. Different domains of Hdj1 mediate FUS phase separation versus suppression of FUS amyloid aggregation.","method":"Live-cell fluorescence imaging, in vitro phase separation assay, G/F-region mutagenesis, domain-swap experiments, FUS aggregation assays","journal":"Proceedings of the National Academy of Sciences of the United States of America","confidence":"High","confidence_rationale":"Tier 2 / Strong — multiple orthogonal methods (imaging, in vitro reconstitution, mutagenesis) in a single study","pmids":["33229560"],"is_preprint":false},{"year":2022,"finding":"DNAJB1 contains a specific HTT-binding motif (HBM) in the hinge region between CTD-I and CTD-II that binds the proline-rich domain (PRD) of soluble and aggregated Huntingtin (HTTExon1). Mutation H244A in the HBM completely abolishes DNAJB1-mediated suppression and disaggregation of HTT fibrils by the trimeric Hsc70/DNAJB1/Apg2 chaperone complex without affecting processing of other substrates. Overexpression of wild-type DNAJB1 but not DNAJB1-H244A prevents HTTExon1Q97 aggregate accumulation in HEK293 cells.","method":"In vitro disaggregation/suppression assays, site-directed mutagenesis (H244A), HEK293 cell aggregation assay, binding studies","journal":"Nature communications","confidence":"High","confidence_rationale":"Tier 1 / Strong — reconstitution in vitro, structure-guided mutagenesis, and cellular validation in one study","pmids":["35948542"],"is_preprint":false},{"year":2017,"finding":"DNAJB1 (HSP40) suppresses MDA5 multimer formation upon dsRNA stimulation, thereby dampening MDA5/MAVS-mediated type I interferon induction. DNAJB1 interacts with MDA5 (identified by yeast two-hybrid), and upon dsRNA stimulation, DNAJB1 and HSP70 are co-upregulated and translocate to stress granules where MDA5 encounters dsRNA. Knockdown of endogenous DNAJB1 increases MDA5-MAVS-mediated IFN promoter activation and renders cells more virus-resistant.","method":"Yeast two-hybrid, Co-IP, IFN promoter reporter assay, knockdown (siRNA), immunofluorescence/co-localization","journal":"Journal of innate immunity","confidence":"Medium","confidence_rationale":"Tier 3 / Moderate — yeast two-hybrid plus Co-IP plus functional reporter assay, single lab, no structural validation","pmids":["29069650"],"is_preprint":false},{"year":2016,"finding":"DNAJB1 (Hsp40/DnaJB1) facilitates nuclear import of influenza A virus ribonucleoproteins (vRNPs): it interacts with NP via the J-domain of Hsp40 and the N-terminal region of NP, promotes NP association with importin-α, and is required for efficient vRNP nuclear import and viral polymerase function. RNAi or pharmacological inhibition of Hsp40 reduces vRNP nuclear import and attenuates viral replication.","method":"Co-IP, domain-mapping (J-domain mutants, NP N-terminal deletion), RNAi knockdown, nuclear import assay, viral replication assay","journal":"Scientific reports","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — reciprocal Co-IP with domain mapping and functional knockdown, single lab","pmids":["26750153"],"is_preprint":false},{"year":2011,"finding":"Influenza A virus nucleoprotein (NP) interacts with Hsp40 (DNAJB1) identified by yeast two-hybrid and confirmed by Co-IP in mammalian cells; NP expression coincides with dissociation of P58(IPK) from Hsp40 and decreased PKR phosphorylation, revealing NP as the viral factor that activates P58(IPK)-mediated PKR inhibition through its interaction with the Hsp40/P58(IPK) complex.","method":"Yeast two-hybrid, Co-IP in mammalian cells, immunofluorescence co-localization, siRNA knockdown, PKR phosphorylation assay","journal":"PloS one","confidence":"Medium","confidence_rationale":"Tier 3 / Moderate — yeast two-hybrid plus Co-IP with functional readout, single lab, mechanism partially indirect","pmids":["21698289"],"is_preprint":false},{"year":2010,"finding":"Influenza A and B virus M2 proteins interact with Hsp40 (DNAJB1) mapped to the CTD1 domain of Hsp40 (in vitro and in vivo); M2-Hsp40 interaction facilitates formation of a stable M2-Hsp40-P58(IPK) complex, enhancing PKR autophosphorylation and inducing cell death.","method":"Yeast two-hybrid, in vitro binding, Co-IP in mammalian cells, domain-mapping, PKR phosphorylation assay","journal":"Protein & cell","confidence":"Medium","confidence_rationale":"Tier 3 / Moderate — in vitro and Co-IP binding plus functional assay, single lab, mechanistic interpretation partly indirect","pmids":["21204021"],"is_preprint":false},{"year":2014,"finding":"DNAJB1 interacts with PDCD5 (identified by yeast two-hybrid) and induces ubiquitin-dependent proteasomal degradation of PDCD5, thereby suppressing p53-mediated apoptosis. The DNAJB1 domain required for PDCD5 interaction maps to residues 180-210 (D5 domain). DNAJB1 knockdown in A549 cells increases PDCD5 levels, activates p53-dependent apoptosis genes, and reduces cancer cell growth in a p53-dependent manner.","method":"Yeast two-hybrid, Co-IP, domain-mapping, ubiquitination assay, siRNA knockdown, luciferase/reporter assays","journal":"Cancer letters","confidence":"Medium","confidence_rationale":"Tier 3 / Moderate — yeast two-hybrid plus Co-IP plus ubiquitination assay with functional cellular readout, single lab","pmids":["25444898"],"is_preprint":false},{"year":2015,"finding":"DNAJB1 interacts with MIG6 (identified by yeast two-hybrid) and destabilizes MIG6 protein through K48-linked ubiquitination, promoting EGFR signaling. DNAJB1 knockdown increases MIG6 protein levels and reduces EGFR pathway activation. This DNAJB1-mediated MIG6 destabilization modulates sensitivity to the EGFR inhibitor gefitinib.","method":"Yeast two-hybrid, Co-IP, ubiquitination assay, siRNA knockdown, EGFR signaling readouts","journal":"Biochimica et biophysica acta","confidence":"Medium","confidence_rationale":"Tier 3 / Moderate — yeast two-hybrid plus Co-IP plus ubiquitination assay, single lab","pmids":["26239118"],"is_preprint":false},{"year":2013,"finding":"DNAJB1 specifically binds MDM2 (but not MDMX) via its C-terminus, identified by yeast two-hybrid and confirmed by in vitro and in vivo binding assays. DNAJB1 stabilizes MDM2 at the post-translational level by inhibiting MDM2 ubiquitin-mediated degradation. In cancer cells, DNAJB1 depletion accelerates MDM2 degradation and reduces p53 pathway activity in a p53-dependent manner, enhancing Rb/E2F pathway activity and promoting cell growth.","method":"Yeast two-hybrid, Co-IP, in vitro binding, siRNA knockdown, ubiquitination assay, in vitro and in vivo cell growth assays","journal":"Biochimica et biophysica acta","confidence":"Medium","confidence_rationale":"Tier 3 / Moderate — yeast two-hybrid plus Co-IP plus functional cellular and in vivo readout, single lab","pmids":["24361594"],"is_preprint":false},{"year":2002,"finding":"Hsp40 (DNAJB1) and Hsp70 together co-localize with intracytoplasmic aggregates of mutant SOD1 in cultured neuronal cells; their combined overexpression (but not either alone) reduces aggregate formation and markedly improves neurite outgrowth, and prevents cell death to a lesser extent.","method":"Co-transfection in neuronal cell culture, immunofluorescence co-localization, aggregate quantification, neurite outgrowth assay","journal":"Brain research","confidence":"Medium","confidence_rationale":"Tier 3 / Moderate — functional co-overexpression with cellular phenotypic readout, single lab, no direct binding assay","pmids":["12213295"],"is_preprint":false},{"year":2001,"finding":"In an in vitro reconstituted system with purified proteins, Hsp40 binding to the progesterone receptor (PR) is the first step in the HSP90 chaperoning pathway, preceding HSP70 binding; this occurs rapidly, independently of ATP or other proteins, with ~1:1 stoichiometry and Kd = 77 nM. The Hsp40·PR complex can then progress to hormone-binding competent PR upon addition of the other chaperones.","method":"Purified protein reconstitution, antibody pull-down, equilibrium binding analysis, hormone-binding activity assay","journal":"The Journal of biological chemistry","confidence":"High","confidence_rationale":"Tier 1 / Moderate — reconstitution with purified proteins, quantitative binding, functional assay; single lab but multiple orthogonal methods","pmids":["11809754"],"is_preprint":false},{"year":2019,"finding":"Hsp40 (including DNAJB1-class members) and Hsp70 inhibit androgen receptor (AR) transcriptional activity by recognizing a region of the AR N-terminal domain (NTD) including the FQNLF motif, competing with the AR ligand-binding domain for this motif and thereby maintaining AR in an inactive conformation. Hsp70 binding increases NTD solubility; stabilizing NTD-Hsp70 interaction with small molecules reduces AR aggregation and promotes its degradation in cell and mouse models of SBMA.","method":"Co-IP, pulldown with purified proteins, small-molecule stabilization assays, cellular and mouse model functional readouts","journal":"Nature communications","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — reciprocal Co-IP, purified protein binding, and in vivo validation; single lab, DNAJB1 role inferred from class-level Hsp40 experiments","pmids":["31395886"],"is_preprint":false},{"year":2018,"finding":"DNAJB1 (Hsp40) is present in a multiprotein complex with full-length AR, ARv7, and Hsp70 in CRPC cells (pulldown with biotinylated compound C86 and binding with purified proteins). Inhibition of Hsp40 by C86 or allosteric Hsp70 inhibition destabilizes both full-length AR and AR splice variants (including ARv7 lacking the ligand-binding domain), reducing their transcriptional activity.","method":"Biotinylated-compound pulldown, binding studies with purified proteins, cell-based protein stability and transcription assays, xenograft tumor model","journal":"Cancer research","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — chemical pulldown plus binding studies plus in vivo xenograft, single lab","pmids":["29764864"],"is_preprint":false},{"year":2022,"finding":"Sirt1 interacts with Dnajb1 and promotes its deacetylation and reduces its ubiquitination; Sirt1 overexpression upregulates Dnajb1 expression and enhances chaperone-mediated autophagy (CMA) activity after closed head injury. Knockdown of Dnajb1 abolishes the Sirt1-mediated attenuation of astrocyte activation and CMA upregulation.","method":"Co-IP, lentiviral overexpression and shRNA knockdown, in vivo CHI model, CMA activity assay, deacetylation/ubiquitination assays","journal":"Cerebral cortex","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — Co-IP plus functional genetic rescue in vivo, single lab","pmids":["35106540"],"is_preprint":false},{"year":1996,"finding":"The human DNAJB1 gene (then HSPF1) is located on chromosome 19p13.2, is composed of three exons divided by two introns, has a GC-rich 5' region, and its promoter contains heat shock elements (HSEs) bound by HSF1, confirming it is a bona fide heat shock protein gene.","method":"Genomic cloning, in situ hybridization, promoter deletion analysis","journal":"Genomics","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — direct genomic characterization with chromosomal mapping; single lab but standard definitive method","pmids":["8975727"],"is_preprint":false},{"year":1998,"finding":"The human DNAJB1 (Hsp40) promoter contains eight contiguous HSE (AGAAN) motifs essential for heat shock response; the major transcription initiation site is 47 bp upstream of the ATG codon. In vivo footprinting confirms HSF1 binds these elements to drive heat-inducible transcription.","method":"5' and 3' RACE, primer extension, deletion constructs/reporter assays, gel mobility supershift with HSF1 antibody, in vivo footprinting","journal":"Biochimica et biophysica acta","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — in vivo footprinting plus reporter assays plus supershift, single lab, multiple orthogonal methods","pmids":["9545528"],"is_preprint":false},{"year":2016,"finding":"DNAJB1 is a transcriptional target of the lens transcription factor FOXE3: chromatin immunoprecipitation and luciferase assays confirm FOXE3 directly regulates DNAJB1 expression. Knockdown of DNAJB1 in human lens epithelial cells causes mitotic arrest, and morpholino-mediated knockdown of dnajb1a in zebrafish produces underdeveloped cataractous lenses with persistent apoptotic nuclei.","method":"Chromatin immunoprecipitation, luciferase reporter assay, siRNA knockdown (cell cycle analysis), zebrafish morpholino knockdown","journal":"Nature communications","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — ChIP plus reporter assay plus loss-of-function in two systems, single lab","pmids":["27218149"],"is_preprint":false},{"year":2018,"finding":"Cytosolic Hsp70 and its Hsp40 co-chaperones (including the mammalian DNAJB1-class Sis1 ortholog) interact with newly synthesized mitochondrial β-barrel proteins; inhibiting Hsp70 activity or depleting Hsp40 co-chaperones reduces import of β-barrel proteins into mitochondria in both yeast and mammalian cells.","method":"Co-IP with newly synthesized proteins, Hsp70 activity inhibition, Hsp40 depletion, import assays in yeast and mammalian cells","journal":"The Journal of cell biology","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — Co-IP plus functional import assay in two organisms, single lab","pmids":["29930205"],"is_preprint":false},{"year":2019,"finding":"DNAJB1 knockout (CRISPR-Cas9) in HEK293 cells does not affect seeded α-synuclein aggregation induced by pre-formed fibrils, demonstrating that DNAJB1 is not required for suppression of this specific aggregation pathway (negative result; DNAJB6 KO, in contrast, significantly increases aggregation).","method":"CRISPR-Cas9 KO, α-Syn PFF seeding, fluorescence microscopy, FRET analysis","journal":"International journal of molecular sciences","confidence":"Medium","confidence_rationale":"Tier 2 / Weak — clean genetic KO with quantitative readout; single lab, single method; negative result explicitly reported","pmids":["31514384"],"is_preprint":false},{"year":2017,"finding":"Overexpression of the mammalian Sis1 homologue DNAJB1 reduces toxicity arising from overexpressed TDP-43 and FUS in primary rodent cortical neurons and human embryonic kidney cells, as measured by cell viability; no direct physical association between Sis1/DNAJB1 and TDP-43 was detected, suggesting an indirect effect on aggregation.","method":"Neuronal cell overexpression, cell viability assay, co-IP (negative result for direct Sis1-TDP43 binding)","journal":"PLoS genetics","confidence":"Medium","confidence_rationale":"Tier 3 / Moderate — functional overexpression in primary neurons, single lab; binding negative result explicitly stated","pmids":["28531192"],"is_preprint":false},{"year":2008,"finding":"TAT-fused Hsp40 (DNAJB1) transduced into cells reduces ubiquitin-proteasome-mediated degradation of Hsp70 under oxidative stress conditions (H2O2 treatment), thereby protecting cells from cytotoxicity; Hsp40 prevents ubiquitination of Hsp70.","method":"TAT-fusion protein transduction, cell viability assay, ubiquitination analysis, Hsp70 degradation assay","journal":"FEBS letters","confidence":"Low","confidence_rationale":"Tier 3 / Weak — single lab, single method for each endpoint, limited mechanistic detail in abstract","pmids":["18258197"],"is_preprint":false},{"year":2023,"finding":"Continued expression of DNAJB1-PRKACA is required not only for tumor maintenance but for tumor cell survival; inducible shRNA knockdown targeting the fusion junction kills FL-HCC patient-derived xenograft (PDX) cells in vitro and inhibits tumor growth in vivo, demonstrating oncogenic addiction to the fusion kinase.","method":"Inducible shRNA (tiling fusion junction), PDX cell viability, in vivo xenograft inhibition","journal":"Clinical cancer research","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — clean inducible KD with in vitro and in vivo validation in PDX, single lab","pmids":["36302174"],"is_preprint":false},{"year":2014,"finding":"HSP40 (DNAJB1) interacts with pyruvate kinase M2 (PKM2) and, together with HSC70, destabilizes PKM2 protein, reducing PKM2-dependent PDK1 expression and glycolysis while affecting mitochondrial oxygen respiration and cancer cell proliferation.","method":"Co-IP (HSP40-PKM2), protein stability assay, siRNA knockdown, metabolic assays (glycolysis, respiration), cell proliferation assay","journal":"PloS one","confidence":"Low","confidence_rationale":"Tier 3 / Weak — single Co-IP plus functional assays, single lab, limited mechanistic detail in abstract","pmids":["24658033"],"is_preprint":false}],"current_model":"DNAJB1 (Hsp40/Hdj1) is a type II J-domain co-chaperone that stimulates Hsp70 ATPase activity via its conserved J-domain, facilitates Hsp70-dependent protein refolding, quality control, and client delivery in both cytoplasm and nucleus; it phase-separates into membraneless organelles via its G/F-rich region to chaperone clients including FUS; it contains a specific HTT-binding motif (H244) essential for disaggregation of huntingtin fibrils by the Hsc70/DNAJB1/Apg2 trimeric complex; it regulates innate antiviral signaling by disrupting MDA5 multimer formation and modulates p53 pathway activity through interactions with MDM2, PDCD5, and MIG6; and the DNAJB1-PRKACA oncogenic fusion kinase, arising from a chromosomal deletion in fibrolamellar HCC, drives tumorigenesis through constitutively dysregulated PKA signaling that requires ongoing expression for tumor maintenance."},"narrative":{"mechanistic_narrative":"DNAJB1 (Hsp40/Hdj1) is a heat-inducible type II J-domain co-chaperone that stimulates Hsp70-dependent protein refolding and quality control in both cytoplasm and nucleus, accelerating Hsp70-mediated reactivation of heat-denatured substrates [PMID:9407119] and acting upstream of the Hsp90 chaperoning pathway by binding client proteins such as the progesterone receptor as the first ATP-independent step in maturation [PMID:11809754]. Its transcription is driven by HSF1 binding to heat shock elements in its promoter [PMID:8975727, PMID:9545528]. DNAJB1 governs aggregation-prone clients through distinct mechanisms: it phase-separates into ubiquitin-rich nuclear bodies and stress granules via its G/F-rich region, co-condensing with FUS to stabilize the liquid phase against amyloid conversion [PMID:33229560], and it carries a dedicated HTT-binding motif (His244) in its CTD-I/CTD-II hinge that is essential for disaggregation of huntingtin fibrils by the Hsc70/DNAJB1/Apg2 complex [PMID:35948542]. Through Hsp70 partnership it also restrains nuclear receptor activity, recognizing the androgen receptor N-terminal FQNLF motif to maintain an inactive conformation and destabilize AR splice variants [PMID:31395886, PMID:29764864]. DNAJB1 additionally functions as a regulatory node coupling chaperone activity to signaling and turnover, stabilizing MDM2 to dampen p53 activity [PMID:24361594], driving ubiquitin-dependent degradation of PDCD5 [PMID:25444898] and MIG6 [PMID:26239118], and suppressing MDA5 multimerization to limit type I interferon induction [PMID:29069650]. Clinically, an in-frame chromosome-19 deletion fuses DNAJB1 exon 1 to the PKA catalytic subunit PRKACA, generating an oncogenic fusion kinase that is sufficient to drive fibrolamellar hepatocellular carcinoma in mice and to which tumors remain addicted [PMID:24578576, PMID:29162699, PMID:28923495, PMID:36302174].","teleology":[{"year":1997,"claim":"Established DNAJB1 as a functional Hsp70 co-chaperone, answering whether human Hsp40 actively assists refolding rather than acting alone.","evidence":"Co-transfection in hamster fibroblasts with compartment-targeted luciferase reactivation assays","pmids":["9407119"],"confidence":"High","gaps":["Did not define the molecular step (ATPase stimulation) by which Hsp40 aids Hsp70","Client range beyond luciferase untested"]},{"year":2001,"claim":"Placed DNAJB1 at the entry point of receptor chaperoning by showing it binds client before Hsp70 in the Hsp90 pathway.","evidence":"Purified-protein reconstitution with equilibrium binding and hormone-binding activity assays on progesterone receptor","pmids":["11809754"],"confidence":"High","gaps":["In vitro only; cellular relevance of the ordered handoff not shown","Structural basis of PR recognition undefined"]},{"year":2014,"claim":"Identified the DNAJB1-PRKACA fusion as a recurrent genetic lesion in fibrolamellar HCC, connecting the gene to a defined human cancer.","evidence":"RNA-seq, reciprocal IP, Western blot and kinase assay in tumor tissue (15/15 tumors)","pmids":["24578576"],"confidence":"High","gaps":["Did not prove the fusion is causal for tumorigenesis","Role of the DNAJB1 portion in kinase dysregulation unresolved"]},{"year":2013,"claim":"Connected chaperone function to the p53 axis by showing DNAJB1 stabilizes MDM2 and tunes p53 pathway output.","evidence":"Yeast two-hybrid, Co-IP, in vitro binding, ubiquitination and cell growth assays","pmids":["24361594"],"confidence":"Medium","gaps":["Single lab; reciprocal validation of the MDM2 interaction limited","Whether stabilization requires J-domain/Hsp70 activity unknown"]},{"year":2016,"claim":"Showed DNAJB1 participates in viral and innate-immune processes, both aiding influenza vRNP nuclear import and being co-opted by viral proteins.","evidence":"Yeast two-hybrid and Co-IP with domain mapping, RNAi, and nuclear import/replication assays (NP, M2, P58IPK)","pmids":["26750153","21698289","21204021"],"confidence":"Medium","gaps":["Mechanisms inferred from interaction plus functional readout, partly indirect","Single-lab findings without structural validation"]},{"year":2017,"claim":"Demonstrated the DNAJB1-PRKACA fusion is sufficient to drive FL-HCC-like liver tumors in vivo, establishing causality.","evidence":"CRISPR-Cas9 and transposon somatic gene transfer in mice, with Co-IP for beta-catenin","pmids":["29162699","28923495"],"confidence":"High","gaps":["Did not define how the DNAJB1 moiety alters PKA signaling biochemically","Cell-of-origin and full downstream program incompletely mapped"]},{"year":2017,"claim":"Defined a role in antiviral signaling by showing DNAJB1 suppresses MDA5 multimerization to restrain type I interferon induction.","evidence":"Yeast two-hybrid, Co-IP, IFN reporter assay, siRNA knockdown, co-localization in stress granules","pmids":["29069650"],"confidence":"Medium","gaps":["Single lab; no structural account of how multimer formation is blocked","Dependence on Hsp70 partnership untested"]},{"year":2020,"claim":"Revealed that DNAJB1 phase-separates via its G/F region and co-condenses with FUS to suppress amyloid conversion, defining a condensate-based chaperone mode.","evidence":"Live-cell imaging, in vitro phase separation, G/F-region mutagenesis, domain-swap and FUS aggregation assays","pmids":["33229560"],"confidence":"High","gaps":["In-cell consequences for endogenous FUS function not fully resolved","Relationship between condensate role and canonical Hsp70 cycle unclear"]},{"year":2022,"claim":"Mapped a specific HTT-binding motif (H244) required for huntingtin fibril disaggregation, distinguishing substrate-specific recognition from general chaperone activity.","evidence":"In vitro disaggregation/suppression assays, H244A mutagenesis, HEK293 aggregation assay, binding studies","pmids":["35948542"],"confidence":"High","gaps":["Whether the HBM engages other PRD-containing substrates untested","High-resolution structure of the DNAJB1-HTT interface not determined"]},{"year":2023,"claim":"Established oncogenic addiction to the fusion kinase by showing continued expression is required for FL-HCC tumor cell survival.","evidence":"Inducible shRNA tiling the fusion junction in patient-derived xenografts in vitro and in vivo","pmids":["36302174"],"confidence":"Medium","gaps":["Did not identify the essential downstream effectors of the fusion","Single-lab PDX system"]},{"year":null,"claim":"How DNAJB1's distinct activities—J-domain Hsp70 stimulation, G/F-driven phase separation, motif-specific substrate recognition, and its ubiquitin-pathway interactions—are integrated and whether the DNAJB1 portion of the oncogenic fusion contributes a chaperone-related function remain unresolved.","evidence":"","pmids":[],"confidence":"Medium","gaps":["No structural model of how the fusion DNAJB1 domain reshapes PKA regulation","Mechanistic link between condensate chaperoning and substrate turnover roles undefined"]}],"mechanism_profile":{"molecular_activity":[{"term_id":"GO:0140096","term_label":"catalytic activity, acting on a protein","supporting_discovery_ids":[2,4,13]},{"term_id":"GO:0098772","term_label":"molecular function regulator activity","supporting_discovery_ids":[2,5,14]},{"term_id":"GO:0044183","term_label":"protein folding chaperone","supporting_discovery_ids":[2,3,4]},{"term_id":"GO:0140110","term_label":"transcription regulator activity","supporting_discovery_ids":[14,15]}],"localization":[{"term_id":"GO:0005829","term_label":"cytosol","supporting_discovery_ids":[2,5]},{"term_id":"GO:0005634","term_label":"nucleus","supporting_discovery_ids":[2,3]},{"term_id":"GO:0005730","term_label":"nucleolus","supporting_discovery_ids":[3]}],"pathway":[{"term_id":"R-HSA-392499","term_label":"Metabolism of proteins","supporting_discovery_ids":[2,4,13]},{"term_id":"R-HSA-8953854","term_label":"Metabolism of RNA","supporting_discovery_ids":[3]},{"term_id":"R-HSA-168256","term_label":"Immune System","supporting_discovery_ids":[5]},{"term_id":"R-HSA-1643685","term_label":"Disease","supporting_discovery_ids":[0,1,24]},{"term_id":"R-HSA-162582","term_label":"Signal Transduction","supporting_discovery_ids":[10,11]}],"complexes":["Hsc70/DNAJB1/Apg2 disaggregase complex"],"partners":["HSPA1A","PRKACA","MDM2","PDCD5","MIG6","IFIH1","FUS","CTNNB1"],"other_free_text":[]}},"prefetch_data":{"uniprot":{"accession":"P25685","full_name":"DnaJ homolog subfamily B member 1","aliases":["DnaJ protein homolog 1","Heat shock 40 kDa protein 1","HSP40","Heat shock protein 40","Human DnaJ protein 1","hDj-1"],"length_aa":340,"mass_kda":38.0,"function":"Interacts with HSP70 and can stimulate its ATPase activity. Acts also with TTC1 as a chaperone adapter that regulates HSP70-dependent folding process by interacting with the HSP70 amino terminal region (PubMed:14503850). Stimulates the association between HSC70 and HIP. Negatively regulates heat shock-induced HSF1 transcriptional activity during the attenuation and recovery phase period of the heat shock response (PubMed:9499401). Stimulates ATP hydrolysis and the folding of unfolded proteins mediated by HSPA1A/B (in vitro) (PubMed:24318877)","subcellular_location":"Cytoplasm; Nucleus; Nucleus, nucleolus","url":"https://www.uniprot.org/uniprotkb/P25685/entry"},"depmap":{"release":"DepMap","has_data":true,"is_common_essential":false,"resolved_as":"","url":"https://depmap.org/portal/gene/DNAJB1","classification":"Not 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perspectives.","date":"2014","source":"Parasitology","url":"https://pubmed.ncbi.nlm.nih.gov/24666996","citation_count":27,"is_preprint":false},{"pmid":"19535913","id":"PMC_19535913","title":"Prion propagation by Hsp40 molecular chaperones.","date":"2009","source":"Prion","url":"https://pubmed.ncbi.nlm.nih.gov/19535913","citation_count":27,"is_preprint":false},{"pmid":"33676026","id":"PMC_33676026","title":"Role of the DNAJ/HSP40 family in the pathogenesis of insulin resistance and type 2 diabetes.","date":"2021","source":"Ageing research reviews","url":"https://pubmed.ncbi.nlm.nih.gov/33676026","citation_count":27,"is_preprint":false},{"pmid":"15494410","id":"PMC_15494410","title":"Hsp70 and Hsp40 chaperones do not modulate retinal phenotype in SCA7 mice.","date":"2004","source":"The Journal of biological chemistry","url":"https://pubmed.ncbi.nlm.nih.gov/15494410","citation_count":27,"is_preprint":false},{"pmid":"36302174","id":"PMC_36302174","title":"Oncogenic Addiction of Fibrolamellar Hepatocellular Carcinoma to the Fusion Kinase DNAJB1-PRKACA.","date":"2023","source":"Clinical cancer research : an official journal of the American Association for Cancer Research","url":"https://pubmed.ncbi.nlm.nih.gov/36302174","citation_count":26,"is_preprint":false},{"pmid":"35948542","id":"PMC_35948542","title":"Identification of a HTT-specific binding motif in DNAJB1 essential for suppression and disaggregation of HTT.","date":"2022","source":"Nature communications","url":"https://pubmed.ncbi.nlm.nih.gov/35948542","citation_count":26,"is_preprint":false},{"pmid":"37159299","id":"PMC_37159299","title":"Mechanisms of Protein Quality Control in the Endoplasmic Reticulum by a Coordinated Hsp40-Hsp70-Hsp90 System.","date":"2023","source":"Annual review of biophysics","url":"https://pubmed.ncbi.nlm.nih.gov/37159299","citation_count":25,"is_preprint":false},{"pmid":"18258197","id":"PMC_18258197","title":"TAT-Hsp40 inhibits oxidative stress-mediated cytotoxicity via the inhibition of Hsp70 ubiquitination.","date":"2008","source":"FEBS letters","url":"https://pubmed.ncbi.nlm.nih.gov/18258197","citation_count":25,"is_preprint":false},{"pmid":"9545528","id":"PMC_9545528","title":"Characterization of HSE sequences in human Hsp40 gene: structural and promoter analysis.","date":"1998","source":"Biochimica et biophysica acta","url":"https://pubmed.ncbi.nlm.nih.gov/9545528","citation_count":25,"is_preprint":false},{"pmid":"12380683","id":"PMC_12380683","title":"Characterization and functional analysis of a heart-enriched DnaJ/ Hsp40 homolog dj4/DjA4.","date":"2002","source":"Cell stress & chaperones","url":"https://pubmed.ncbi.nlm.nih.gov/12380683","citation_count":25,"is_preprint":false},{"pmid":"35106540","id":"PMC_35106540","title":"Sirt1 attenuates astrocyte activation via modulating Dnajb1 and chaperone-mediated autophagy after closed head injury.","date":"2022","source":"Cerebral cortex (New York, N.Y. : 1991)","url":"https://pubmed.ncbi.nlm.nih.gov/35106540","citation_count":24,"is_preprint":false},{"pmid":"35377810","id":"PMC_35377810","title":"Active unfolding of the glucocorticoid receptor by the Hsp70/Hsp40 chaperone system in single-molecule mechanical experiments.","date":"2022","source":"Proceedings of the National Academy of Sciences of the United States of America","url":"https://pubmed.ncbi.nlm.nih.gov/35377810","citation_count":24,"is_preprint":false},{"pmid":"34182772","id":"PMC_34182772","title":"Protein Prenylation and Hsp40 in Thermotolerance of Plasmodium falciparum Malaria Parasites.","date":"2021","source":"mBio","url":"https://pubmed.ncbi.nlm.nih.gov/34182772","citation_count":23,"is_preprint":false},{"pmid":"22011374","id":"PMC_22011374","title":"Central domain deletions affect the SAXS solution structure and function of yeast Hsp40 proteins Sis1 and Ydj1.","date":"2011","source":"BMC structural biology","url":"https://pubmed.ncbi.nlm.nih.gov/22011374","citation_count":23,"is_preprint":false},{"pmid":"29633387","id":"PMC_29633387","title":"Variant-specific and reciprocal Hsp40 functions in Hsp104-mediated prion elimination.","date":"2018","source":"Molecular microbiology","url":"https://pubmed.ncbi.nlm.nih.gov/29633387","citation_count":23,"is_preprint":false},{"pmid":"35373908","id":"PMC_35373908","title":"The HSP40 chaperone Ydj1 drives amyloid beta 42 toxicity.","date":"2022","source":"EMBO molecular medicine","url":"https://pubmed.ncbi.nlm.nih.gov/35373908","citation_count":23,"is_preprint":false},{"pmid":"36520305","id":"PMC_36520305","title":"Specification of Hsp70 Function by Hsp40 Co-chaperones.","date":"2023","source":"Sub-cellular biochemistry","url":"https://pubmed.ncbi.nlm.nih.gov/36520305","citation_count":22,"is_preprint":false},{"pmid":"36349953","id":"PMC_36349953","title":"Plasma membrane-localized Hsp40/DNAJ chaperone protein facilitates OsSUVH7-OsBAG4-OsMYB106 transcriptional complex formation for OsHKT1;5 activation.","date":"2022","source":"Journal of integrative plant biology","url":"https://pubmed.ncbi.nlm.nih.gov/36349953","citation_count":22,"is_preprint":false},{"pmid":"8975727","id":"PMC_8975727","title":"Genomic cloning of a human heat shock protein 40 (Hsp40) gene (HSPF1) and its chromosomal localization to 19p13.2.","date":"1996","source":"Genomics","url":"https://pubmed.ncbi.nlm.nih.gov/8975727","citation_count":22,"is_preprint":false},{"pmid":"31739611","id":"PMC_31739611","title":"Hsp40 Protein DNAJB6 Interacts with Viral NS3 and Inhibits the Replication of the Japanese Encephalitis Virus.","date":"2019","source":"International journal of molecular sciences","url":"https://pubmed.ncbi.nlm.nih.gov/31739611","citation_count":22,"is_preprint":false},{"pmid":"24361594","id":"PMC_24361594","title":"DNAJB1 stabilizes MDM2 and contributes to cancer cell proliferation in a p53-dependent manner.","date":"2013","source":"Biochimica et biophysica acta","url":"https://pubmed.ncbi.nlm.nih.gov/24361594","citation_count":21,"is_preprint":false},{"pmid":"30118500","id":"PMC_30118500","title":"Trans-chalcone increases p53 activity via DNAJB1/HSP40 induction and CRM1 inhibition.","date":"2018","source":"PloS one","url":"https://pubmed.ncbi.nlm.nih.gov/30118500","citation_count":21,"is_preprint":false}],"cost":{"stage1":{"model":"claude-sonnet-4-6","input_tokens":47896,"output_tokens":6822,"usd":0.123009,"stage1_stop_reason":"end_turn"},"stage2":{"model":"claude-opus-4-8","input_tokens":15835,"output_tokens":3635,"usd":0.085025,"stage2_stop_reason":"end_turn"},"total_usd":0.208034,"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\": 2014,\n      \"finding\": \"A ~400-kilobase deletion on chromosome 19 fuses DNAJB1 exon 1 in-frame with PRKACA (catalytic subunit of PKA), generating a chimeric DNAJB1-PRKACA protein detected by immunoprecipitation and Western blot in fibrolamellar hepatocellular carcinoma (FL-HCC) tumor tissue; the fusion protein retains kinase activity in a cell culture assay.\",\n      \"method\": \"Immunoprecipitation, Western blot, cell culture kinase assay, RNA sequencing\",\n      \"journal\": \"Science\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — reciprocal IP, kinase activity assay, replicated in 15/15 tumors; independently confirmed by multiple subsequent studies\",\n      \"pmids\": [\"24578576\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2017,\n      \"finding\": \"Expression of the DNAJB1-PRKACA fusion protein (via CRISPR-Cas9 or transposon-mediated gene transfer) is sufficient to drive liver tumor formation in mice resembling human FL-HCC; overexpression of wild-type PRKACA alone does not fully recapitulate the oncogenic activity, indicating the DNAJB1 portion contributes to oncogenesis beyond mere PRKACA overexpression. The fusion kinase interacts with β-catenin, and tumorigenesis is enhanced by genetic Wnt pathway activation.\",\n      \"method\": \"CRISPR-Cas9 genome editing, transposon-mediated somatic gene transfer, mouse tumor models, Co-IP for β-catenin interaction\",\n      \"journal\": \"Proceedings of the National Academy of Sciences of the United States of America\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — two independent in vivo engineering approaches in the same study, replicated by a second independent CRISPR study (PMID 28923495)\",\n      \"pmids\": [\"29162699\", \"28923495\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 1997,\n      \"finding\": \"Human Hsp40 (DNAJB1) acts as a co-chaperone for Hsp70 in mammalian cells: Hsp40 alone does not protect luciferase from heat inactivation and slightly increases heat sensitivity, but when co-expressed with human Hsp70, it accelerates luciferase reactivation from the heat-inactivated state. This Hsp40/Hsp70 chaperone activity operates in both cytoplasm and nucleus.\",\n      \"method\": \"Co-transfection in hamster fibroblasts, luciferase heat-inactivation and reactivation assays, subcellular-targeted luciferase constructs\",\n      \"journal\": \"The Journal of biological chemistry\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — clean functional in vivo assay with compartment-specific constructs, replicated conceptually across multiple labs\",\n      \"pmids\": [\"9407119\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2020,\n      \"finding\": \"DNAJB1 (Hdj1) phase-separates into ubiquitin-rich nuclear bodies under basal conditions and into stress granules upon stress; this phase separation is driven by its G/F-rich region. Mutations in the G/F region impair Hdj1 phase separation and its incorporation into stress granules, and abrogate co-phase separation with FUS. Co-phase separation of Hdj1 with FUS stabilizes the liquid phase of FUS against amyloid aggregation in vitro and reduces abnormal FUS aggregation in cells. Different domains of Hdj1 mediate FUS phase separation versus suppression of FUS amyloid aggregation.\",\n      \"method\": \"Live-cell fluorescence imaging, in vitro phase separation assay, G/F-region mutagenesis, domain-swap experiments, FUS aggregation assays\",\n      \"journal\": \"Proceedings of the National Academy of Sciences of the United States of America\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — multiple orthogonal methods (imaging, in vitro reconstitution, mutagenesis) in a single study\",\n      \"pmids\": [\"33229560\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2022,\n      \"finding\": \"DNAJB1 contains a specific HTT-binding motif (HBM) in the hinge region between CTD-I and CTD-II that binds the proline-rich domain (PRD) of soluble and aggregated Huntingtin (HTTExon1). Mutation H244A in the HBM completely abolishes DNAJB1-mediated suppression and disaggregation of HTT fibrils by the trimeric Hsc70/DNAJB1/Apg2 chaperone complex without affecting processing of other substrates. Overexpression of wild-type DNAJB1 but not DNAJB1-H244A prevents HTTExon1Q97 aggregate accumulation in HEK293 cells.\",\n      \"method\": \"In vitro disaggregation/suppression assays, site-directed mutagenesis (H244A), HEK293 cell aggregation assay, binding studies\",\n      \"journal\": \"Nature communications\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 / Strong — reconstitution in vitro, structure-guided mutagenesis, and cellular validation in one study\",\n      \"pmids\": [\"35948542\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2017,\n      \"finding\": \"DNAJB1 (HSP40) suppresses MDA5 multimer formation upon dsRNA stimulation, thereby dampening MDA5/MAVS-mediated type I interferon induction. DNAJB1 interacts with MDA5 (identified by yeast two-hybrid), and upon dsRNA stimulation, DNAJB1 and HSP70 are co-upregulated and translocate to stress granules where MDA5 encounters dsRNA. Knockdown of endogenous DNAJB1 increases MDA5-MAVS-mediated IFN promoter activation and renders cells more virus-resistant.\",\n      \"method\": \"Yeast two-hybrid, Co-IP, IFN promoter reporter assay, knockdown (siRNA), immunofluorescence/co-localization\",\n      \"journal\": \"Journal of innate immunity\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 3 / Moderate — yeast two-hybrid plus Co-IP plus functional reporter assay, single lab, no structural validation\",\n      \"pmids\": [\"29069650\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2016,\n      \"finding\": \"DNAJB1 (Hsp40/DnaJB1) facilitates nuclear import of influenza A virus ribonucleoproteins (vRNPs): it interacts with NP via the J-domain of Hsp40 and the N-terminal region of NP, promotes NP association with importin-α, and is required for efficient vRNP nuclear import and viral polymerase function. RNAi or pharmacological inhibition of Hsp40 reduces vRNP nuclear import and attenuates viral replication.\",\n      \"method\": \"Co-IP, domain-mapping (J-domain mutants, NP N-terminal deletion), RNAi knockdown, nuclear import assay, viral replication assay\",\n      \"journal\": \"Scientific reports\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — reciprocal Co-IP with domain mapping and functional knockdown, single lab\",\n      \"pmids\": [\"26750153\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2011,\n      \"finding\": \"Influenza A virus nucleoprotein (NP) interacts with Hsp40 (DNAJB1) identified by yeast two-hybrid and confirmed by Co-IP in mammalian cells; NP expression coincides with dissociation of P58(IPK) from Hsp40 and decreased PKR phosphorylation, revealing NP as the viral factor that activates P58(IPK)-mediated PKR inhibition through its interaction with the Hsp40/P58(IPK) complex.\",\n      \"method\": \"Yeast two-hybrid, Co-IP in mammalian cells, immunofluorescence co-localization, siRNA knockdown, PKR phosphorylation assay\",\n      \"journal\": \"PloS one\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 3 / Moderate — yeast two-hybrid plus Co-IP with functional readout, single lab, mechanism partially indirect\",\n      \"pmids\": [\"21698289\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2010,\n      \"finding\": \"Influenza A and B virus M2 proteins interact with Hsp40 (DNAJB1) mapped to the CTD1 domain of Hsp40 (in vitro and in vivo); M2-Hsp40 interaction facilitates formation of a stable M2-Hsp40-P58(IPK) complex, enhancing PKR autophosphorylation and inducing cell death.\",\n      \"method\": \"Yeast two-hybrid, in vitro binding, Co-IP in mammalian cells, domain-mapping, PKR phosphorylation assay\",\n      \"journal\": \"Protein & cell\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 3 / Moderate — in vitro and Co-IP binding plus functional assay, single lab, mechanistic interpretation partly indirect\",\n      \"pmids\": [\"21204021\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2014,\n      \"finding\": \"DNAJB1 interacts with PDCD5 (identified by yeast two-hybrid) and induces ubiquitin-dependent proteasomal degradation of PDCD5, thereby suppressing p53-mediated apoptosis. The DNAJB1 domain required for PDCD5 interaction maps to residues 180-210 (D5 domain). DNAJB1 knockdown in A549 cells increases PDCD5 levels, activates p53-dependent apoptosis genes, and reduces cancer cell growth in a p53-dependent manner.\",\n      \"method\": \"Yeast two-hybrid, Co-IP, domain-mapping, ubiquitination assay, siRNA knockdown, luciferase/reporter assays\",\n      \"journal\": \"Cancer letters\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 3 / Moderate — yeast two-hybrid plus Co-IP plus ubiquitination assay with functional cellular readout, single lab\",\n      \"pmids\": [\"25444898\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2015,\n      \"finding\": \"DNAJB1 interacts with MIG6 (identified by yeast two-hybrid) and destabilizes MIG6 protein through K48-linked ubiquitination, promoting EGFR signaling. DNAJB1 knockdown increases MIG6 protein levels and reduces EGFR pathway activation. This DNAJB1-mediated MIG6 destabilization modulates sensitivity to the EGFR inhibitor gefitinib.\",\n      \"method\": \"Yeast two-hybrid, Co-IP, ubiquitination assay, siRNA knockdown, EGFR signaling readouts\",\n      \"journal\": \"Biochimica et biophysica acta\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 3 / Moderate — yeast two-hybrid plus Co-IP plus ubiquitination assay, single lab\",\n      \"pmids\": [\"26239118\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2013,\n      \"finding\": \"DNAJB1 specifically binds MDM2 (but not MDMX) via its C-terminus, identified by yeast two-hybrid and confirmed by in vitro and in vivo binding assays. DNAJB1 stabilizes MDM2 at the post-translational level by inhibiting MDM2 ubiquitin-mediated degradation. In cancer cells, DNAJB1 depletion accelerates MDM2 degradation and reduces p53 pathway activity in a p53-dependent manner, enhancing Rb/E2F pathway activity and promoting cell growth.\",\n      \"method\": \"Yeast two-hybrid, Co-IP, in vitro binding, siRNA knockdown, ubiquitination assay, in vitro and in vivo cell growth assays\",\n      \"journal\": \"Biochimica et biophysica acta\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 3 / Moderate — yeast two-hybrid plus Co-IP plus functional cellular and in vivo readout, single lab\",\n      \"pmids\": [\"24361594\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2002,\n      \"finding\": \"Hsp40 (DNAJB1) and Hsp70 together co-localize with intracytoplasmic aggregates of mutant SOD1 in cultured neuronal cells; their combined overexpression (but not either alone) reduces aggregate formation and markedly improves neurite outgrowth, and prevents cell death to a lesser extent.\",\n      \"method\": \"Co-transfection in neuronal cell culture, immunofluorescence co-localization, aggregate quantification, neurite outgrowth assay\",\n      \"journal\": \"Brain research\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 3 / Moderate — functional co-overexpression with cellular phenotypic readout, single lab, no direct binding assay\",\n      \"pmids\": [\"12213295\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2001,\n      \"finding\": \"In an in vitro reconstituted system with purified proteins, Hsp40 binding to the progesterone receptor (PR) is the first step in the HSP90 chaperoning pathway, preceding HSP70 binding; this occurs rapidly, independently of ATP or other proteins, with ~1:1 stoichiometry and Kd = 77 nM. The Hsp40·PR complex can then progress to hormone-binding competent PR upon addition of the other chaperones.\",\n      \"method\": \"Purified protein reconstitution, antibody pull-down, equilibrium binding analysis, hormone-binding activity assay\",\n      \"journal\": \"The Journal of biological chemistry\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 / Moderate — reconstitution with purified proteins, quantitative binding, functional assay; single lab but multiple orthogonal methods\",\n      \"pmids\": [\"11809754\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2019,\n      \"finding\": \"Hsp40 (including DNAJB1-class members) and Hsp70 inhibit androgen receptor (AR) transcriptional activity by recognizing a region of the AR N-terminal domain (NTD) including the FQNLF motif, competing with the AR ligand-binding domain for this motif and thereby maintaining AR in an inactive conformation. Hsp70 binding increases NTD solubility; stabilizing NTD-Hsp70 interaction with small molecules reduces AR aggregation and promotes its degradation in cell and mouse models of SBMA.\",\n      \"method\": \"Co-IP, pulldown with purified proteins, small-molecule stabilization assays, cellular and mouse model functional readouts\",\n      \"journal\": \"Nature communications\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — reciprocal Co-IP, purified protein binding, and in vivo validation; single lab, DNAJB1 role inferred from class-level Hsp40 experiments\",\n      \"pmids\": [\"31395886\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2018,\n      \"finding\": \"DNAJB1 (Hsp40) is present in a multiprotein complex with full-length AR, ARv7, and Hsp70 in CRPC cells (pulldown with biotinylated compound C86 and binding with purified proteins). Inhibition of Hsp40 by C86 or allosteric Hsp70 inhibition destabilizes both full-length AR and AR splice variants (including ARv7 lacking the ligand-binding domain), reducing their transcriptional activity.\",\n      \"method\": \"Biotinylated-compound pulldown, binding studies with purified proteins, cell-based protein stability and transcription assays, xenograft tumor model\",\n      \"journal\": \"Cancer research\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — chemical pulldown plus binding studies plus in vivo xenograft, single lab\",\n      \"pmids\": [\"29764864\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2022,\n      \"finding\": \"Sirt1 interacts with Dnajb1 and promotes its deacetylation and reduces its ubiquitination; Sirt1 overexpression upregulates Dnajb1 expression and enhances chaperone-mediated autophagy (CMA) activity after closed head injury. Knockdown of Dnajb1 abolishes the Sirt1-mediated attenuation of astrocyte activation and CMA upregulation.\",\n      \"method\": \"Co-IP, lentiviral overexpression and shRNA knockdown, in vivo CHI model, CMA activity assay, deacetylation/ubiquitination assays\",\n      \"journal\": \"Cerebral cortex\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — Co-IP plus functional genetic rescue in vivo, single lab\",\n      \"pmids\": [\"35106540\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 1996,\n      \"finding\": \"The human DNAJB1 gene (then HSPF1) is located on chromosome 19p13.2, is composed of three exons divided by two introns, has a GC-rich 5' region, and its promoter contains heat shock elements (HSEs) bound by HSF1, confirming it is a bona fide heat shock protein gene.\",\n      \"method\": \"Genomic cloning, in situ hybridization, promoter deletion analysis\",\n      \"journal\": \"Genomics\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — direct genomic characterization with chromosomal mapping; single lab but standard definitive method\",\n      \"pmids\": [\"8975727\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 1998,\n      \"finding\": \"The human DNAJB1 (Hsp40) promoter contains eight contiguous HSE (AGAAN) motifs essential for heat shock response; the major transcription initiation site is 47 bp upstream of the ATG codon. In vivo footprinting confirms HSF1 binds these elements to drive heat-inducible transcription.\",\n      \"method\": \"5' and 3' RACE, primer extension, deletion constructs/reporter assays, gel mobility supershift with HSF1 antibody, in vivo footprinting\",\n      \"journal\": \"Biochimica et biophysica acta\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — in vivo footprinting plus reporter assays plus supershift, single lab, multiple orthogonal methods\",\n      \"pmids\": [\"9545528\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2016,\n      \"finding\": \"DNAJB1 is a transcriptional target of the lens transcription factor FOXE3: chromatin immunoprecipitation and luciferase assays confirm FOXE3 directly regulates DNAJB1 expression. Knockdown of DNAJB1 in human lens epithelial cells causes mitotic arrest, and morpholino-mediated knockdown of dnajb1a in zebrafish produces underdeveloped cataractous lenses with persistent apoptotic nuclei.\",\n      \"method\": \"Chromatin immunoprecipitation, luciferase reporter assay, siRNA knockdown (cell cycle analysis), zebrafish morpholino knockdown\",\n      \"journal\": \"Nature communications\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — ChIP plus reporter assay plus loss-of-function in two systems, single lab\",\n      \"pmids\": [\"27218149\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2018,\n      \"finding\": \"Cytosolic Hsp70 and its Hsp40 co-chaperones (including the mammalian DNAJB1-class Sis1 ortholog) interact with newly synthesized mitochondrial β-barrel proteins; inhibiting Hsp70 activity or depleting Hsp40 co-chaperones reduces import of β-barrel proteins into mitochondria in both yeast and mammalian cells.\",\n      \"method\": \"Co-IP with newly synthesized proteins, Hsp70 activity inhibition, Hsp40 depletion, import assays in yeast and mammalian cells\",\n      \"journal\": \"The Journal of cell biology\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — Co-IP plus functional import assay in two organisms, single lab\",\n      \"pmids\": [\"29930205\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2019,\n      \"finding\": \"DNAJB1 knockout (CRISPR-Cas9) in HEK293 cells does not affect seeded α-synuclein aggregation induced by pre-formed fibrils, demonstrating that DNAJB1 is not required for suppression of this specific aggregation pathway (negative result; DNAJB6 KO, in contrast, significantly increases aggregation).\",\n      \"method\": \"CRISPR-Cas9 KO, α-Syn PFF seeding, fluorescence microscopy, FRET analysis\",\n      \"journal\": \"International journal of molecular sciences\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Weak — clean genetic KO with quantitative readout; single lab, single method; negative result explicitly reported\",\n      \"pmids\": [\"31514384\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2017,\n      \"finding\": \"Overexpression of the mammalian Sis1 homologue DNAJB1 reduces toxicity arising from overexpressed TDP-43 and FUS in primary rodent cortical neurons and human embryonic kidney cells, as measured by cell viability; no direct physical association between Sis1/DNAJB1 and TDP-43 was detected, suggesting an indirect effect on aggregation.\",\n      \"method\": \"Neuronal cell overexpression, cell viability assay, co-IP (negative result for direct Sis1-TDP43 binding)\",\n      \"journal\": \"PLoS genetics\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 3 / Moderate — functional overexpression in primary neurons, single lab; binding negative result explicitly stated\",\n      \"pmids\": [\"28531192\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2008,\n      \"finding\": \"TAT-fused Hsp40 (DNAJB1) transduced into cells reduces ubiquitin-proteasome-mediated degradation of Hsp70 under oxidative stress conditions (H2O2 treatment), thereby protecting cells from cytotoxicity; Hsp40 prevents ubiquitination of Hsp70.\",\n      \"method\": \"TAT-fusion protein transduction, cell viability assay, ubiquitination analysis, Hsp70 degradation assay\",\n      \"journal\": \"FEBS letters\",\n      \"confidence\": \"Low\",\n      \"confidence_rationale\": \"Tier 3 / Weak — single lab, single method for each endpoint, limited mechanistic detail in abstract\",\n      \"pmids\": [\"18258197\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2023,\n      \"finding\": \"Continued expression of DNAJB1-PRKACA is required not only for tumor maintenance but for tumor cell survival; inducible shRNA knockdown targeting the fusion junction kills FL-HCC patient-derived xenograft (PDX) cells in vitro and inhibits tumor growth in vivo, demonstrating oncogenic addiction to the fusion kinase.\",\n      \"method\": \"Inducible shRNA (tiling fusion junction), PDX cell viability, in vivo xenograft inhibition\",\n      \"journal\": \"Clinical cancer research\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — clean inducible KD with in vitro and in vivo validation in PDX, single lab\",\n      \"pmids\": [\"36302174\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2014,\n      \"finding\": \"HSP40 (DNAJB1) interacts with pyruvate kinase M2 (PKM2) and, together with HSC70, destabilizes PKM2 protein, reducing PKM2-dependent PDK1 expression and glycolysis while affecting mitochondrial oxygen respiration and cancer cell proliferation.\",\n      \"method\": \"Co-IP (HSP40-PKM2), protein stability assay, siRNA knockdown, metabolic assays (glycolysis, respiration), cell proliferation assay\",\n      \"journal\": \"PloS one\",\n      \"confidence\": \"Low\",\n      \"confidence_rationale\": \"Tier 3 / Weak — single Co-IP plus functional assays, single lab, limited mechanistic detail in abstract\",\n      \"pmids\": [\"24658033\"],\n      \"is_preprint\": false\n    }\n  ],\n  \"current_model\": \"DNAJB1 (Hsp40/Hdj1) is a type II J-domain co-chaperone that stimulates Hsp70 ATPase activity via its conserved J-domain, facilitates Hsp70-dependent protein refolding, quality control, and client delivery in both cytoplasm and nucleus; it phase-separates into membraneless organelles via its G/F-rich region to chaperone clients including FUS; it contains a specific HTT-binding motif (H244) essential for disaggregation of huntingtin fibrils by the Hsc70/DNAJB1/Apg2 trimeric complex; it regulates innate antiviral signaling by disrupting MDA5 multimer formation and modulates p53 pathway activity through interactions with MDM2, PDCD5, and MIG6; and the DNAJB1-PRKACA oncogenic fusion kinase, arising from a chromosomal deletion in fibrolamellar HCC, drives tumorigenesis through constitutively dysregulated PKA signaling that requires ongoing expression for tumor maintenance.\"\n}\n```","stage2_raw":"{\n  \"mechanistic_narrative\": \"DNAJB1 (Hsp40/Hdj1) is a heat-inducible type II J-domain co-chaperone that stimulates Hsp70-dependent protein refolding and quality control in both cytoplasm and nucleus, accelerating Hsp70-mediated reactivation of heat-denatured substrates [#2] and acting upstream of the Hsp90 chaperoning pathway by binding client proteins such as the progesterone receptor as the first ATP-independent step in maturation [#13]. Its transcription is driven by HSF1 binding to heat shock elements in its promoter [#17, #18]. DNAJB1 governs aggregation-prone clients through distinct mechanisms: it phase-separates into ubiquitin-rich nuclear bodies and stress granules via its G/F-rich region, co-condensing with FUS to stabilize the liquid phase against amyloid conversion [#3], and it carries a dedicated HTT-binding motif (His244) in its CTD-I/CTD-II hinge that is essential for disaggregation of huntingtin fibrils by the Hsc70/DNAJB1/Apg2 complex [#4]. Through Hsp70 partnership it also restrains nuclear receptor activity, recognizing the androgen receptor N-terminal FQNLF motif to maintain an inactive conformation and destabilize AR splice variants [#14, #15]. DNAJB1 additionally functions as a regulatory node coupling chaperone activity to signaling and turnover, stabilizing MDM2 to dampen p53 activity [#11], driving ubiquitin-dependent degradation of PDCD5 [#9] and MIG6 [#10], and suppressing MDA5 multimerization to limit type I interferon induction [#5]. Clinically, an in-frame chromosome-19 deletion fuses DNAJB1 exon 1 to the PKA catalytic subunit PRKACA, generating an oncogenic fusion kinase that is sufficient to drive fibrolamellar hepatocellular carcinoma in mice and to which tumors remain addicted [#0, #1, #24].\",\n  \"teleology\": [\n    {\n      \"year\": 1997,\n      \"claim\": \"Established DNAJB1 as a functional Hsp70 co-chaperone, answering whether human Hsp40 actively assists refolding rather than acting alone.\",\n      \"evidence\": \"Co-transfection in hamster fibroblasts with compartment-targeted luciferase reactivation assays\",\n      \"pmids\": [\"9407119\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Did not define the molecular step (ATPase stimulation) by which Hsp40 aids Hsp70\", \"Client range beyond luciferase untested\"]\n    },\n    {\n      \"year\": 2001,\n      \"claim\": \"Placed DNAJB1 at the entry point of receptor chaperoning by showing it binds client before Hsp70 in the Hsp90 pathway.\",\n      \"evidence\": \"Purified-protein reconstitution with equilibrium binding and hormone-binding activity assays on progesterone receptor\",\n      \"pmids\": [\"11809754\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"In vitro only; cellular relevance of the ordered handoff not shown\", \"Structural basis of PR recognition undefined\"]\n    },\n    {\n      \"year\": 2014,\n      \"claim\": \"Identified the DNAJB1-PRKACA fusion as a recurrent genetic lesion in fibrolamellar HCC, connecting the gene to a defined human cancer.\",\n      \"evidence\": \"RNA-seq, reciprocal IP, Western blot and kinase assay in tumor tissue (15/15 tumors)\",\n      \"pmids\": [\"24578576\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Did not prove the fusion is causal for tumorigenesis\", \"Role of the DNAJB1 portion in kinase dysregulation unresolved\"]\n    },\n    {\n      \"year\": 2013,\n      \"claim\": \"Connected chaperone function to the p53 axis by showing DNAJB1 stabilizes MDM2 and tunes p53 pathway output.\",\n      \"evidence\": \"Yeast two-hybrid, Co-IP, in vitro binding, ubiquitination and cell growth assays\",\n      \"pmids\": [\"24361594\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Single lab; reciprocal validation of the MDM2 interaction limited\", \"Whether stabilization requires J-domain/Hsp70 activity unknown\"]\n    },\n    {\n      \"year\": 2016,\n      \"claim\": \"Showed DNAJB1 participates in viral and innate-immune processes, both aiding influenza vRNP nuclear import and being co-opted by viral proteins.\",\n      \"evidence\": \"Yeast two-hybrid and Co-IP with domain mapping, RNAi, and nuclear import/replication assays (NP, M2, P58IPK)\",\n      \"pmids\": [\"26750153\", \"21698289\", \"21204021\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Mechanisms inferred from interaction plus functional readout, partly indirect\", \"Single-lab findings without structural validation\"]\n    },\n    {\n      \"year\": 2017,\n      \"claim\": \"Demonstrated the DNAJB1-PRKACA fusion is sufficient to drive FL-HCC-like liver tumors in vivo, establishing causality.\",\n      \"evidence\": \"CRISPR-Cas9 and transposon somatic gene transfer in mice, with Co-IP for beta-catenin\",\n      \"pmids\": [\"29162699\", \"28923495\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Did not define how the DNAJB1 moiety alters PKA signaling biochemically\", \"Cell-of-origin and full downstream program incompletely mapped\"]\n    },\n    {\n      \"year\": 2017,\n      \"claim\": \"Defined a role in antiviral signaling by showing DNAJB1 suppresses MDA5 multimerization to restrain type I interferon induction.\",\n      \"evidence\": \"Yeast two-hybrid, Co-IP, IFN reporter assay, siRNA knockdown, co-localization in stress granules\",\n      \"pmids\": [\"29069650\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Single lab; no structural account of how multimer formation is blocked\", \"Dependence on Hsp70 partnership untested\"]\n    },\n    {\n      \"year\": 2020,\n      \"claim\": \"Revealed that DNAJB1 phase-separates via its G/F region and co-condenses with FUS to suppress amyloid conversion, defining a condensate-based chaperone mode.\",\n      \"evidence\": \"Live-cell imaging, in vitro phase separation, G/F-region mutagenesis, domain-swap and FUS aggregation assays\",\n      \"pmids\": [\"33229560\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"In-cell consequences for endogenous FUS function not fully resolved\", \"Relationship between condensate role and canonical Hsp70 cycle unclear\"]\n    },\n    {\n      \"year\": 2022,\n      \"claim\": \"Mapped a specific HTT-binding motif (H244) required for huntingtin fibril disaggregation, distinguishing substrate-specific recognition from general chaperone activity.\",\n      \"evidence\": \"In vitro disaggregation/suppression assays, H244A mutagenesis, HEK293 aggregation assay, binding studies\",\n      \"pmids\": [\"35948542\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Whether the HBM engages other PRD-containing substrates untested\", \"High-resolution structure of the DNAJB1-HTT interface not determined\"]\n    },\n    {\n      \"year\": 2023,\n      \"claim\": \"Established oncogenic addiction to the fusion kinase by showing continued expression is required for FL-HCC tumor cell survival.\",\n      \"evidence\": \"Inducible shRNA tiling the fusion junction in patient-derived xenografts in vitro and in vivo\",\n      \"pmids\": [\"36302174\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Did not identify the essential downstream effectors of the fusion\", \"Single-lab PDX system\"]\n    },\n    {\n      \"year\": null,\n      \"claim\": \"How DNAJB1's distinct activities—J-domain Hsp70 stimulation, G/F-driven phase separation, motif-specific substrate recognition, and its ubiquitin-pathway interactions—are integrated and whether the DNAJB1 portion of the oncogenic fusion contributes a chaperone-related function remain unresolved.\",\n      \"evidence\": \"\",\n      \"pmids\": [],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"No structural model of how the fusion DNAJB1 domain reshapes PKA regulation\", \"Mechanistic link between condensate chaperoning and substrate turnover roles undefined\"]\n    }\n  ],\n  \"mechanism_profile\": {\n    \"molecular_activity\": [\n      {\"term_id\": \"GO:0140096\", \"supporting_discovery_ids\": [2, 4, 13]},\n      {\"term_id\": \"GO:0098772\", \"supporting_discovery_ids\": [2, 5, 14]},\n      {\"term_id\": \"GO:0044183\", \"supporting_discovery_ids\": [2, 3, 4]},\n      {\"term_id\": \"GO:0140110\", \"supporting_discovery_ids\": [14, 15]}\n    ],\n    \"localization\": [\n      {\"term_id\": \"GO:0005829\", \"supporting_discovery_ids\": [2, 5]},\n      {\"term_id\": \"GO:0005634\", \"supporting_discovery_ids\": [2, 3]},\n      {\"term_id\": \"GO:0005730\", \"supporting_discovery_ids\": [3]}\n    ],\n    \"pathway\": [\n      {\"term_id\": \"R-HSA-392499\", \"supporting_discovery_ids\": [2, 4, 13]},\n      {\"term_id\": \"R-HSA-8953854\", \"supporting_discovery_ids\": [3]},\n      {\"term_id\": \"R-HSA-168256\", \"supporting_discovery_ids\": [5]},\n      {\"term_id\": \"R-HSA-1643685\", \"supporting_discovery_ids\": [0, 1, 24]},\n      {\"term_id\": \"R-HSA-162582\", \"supporting_discovery_ids\": [10, 11]}\n    ],\n    \"complexes\": [\"Hsc70/DNAJB1/Apg2 disaggregase complex\"],\n    \"partners\": [\"HSPA1A\", \"PRKACA\", \"MDM2\", \"PDCD5\", \"MIG6\", \"IFIH1\", \"FUS\", \"CTNNB1\"],\n    \"other_free_text\": []\n  }\n}","audit_flag":null,"evaluation":{"pairwise":"win","faith_supported":6,"faith_total":6,"faith_pct":100.0}}