{"gene":"DNAJA4","run_date":"2026-04-28T17:46:03","timeline":{"discoveries":[{"year":2006,"finding":"DNAJA4 is a SREBP2-regulated chaperone: its mRNA expression is controlled by SREBP2 (demonstrated via dominant-negative SREBP2 adenoviral overexpression abolishing cholesterol-regulated changes in DNAJA4 expression), and DNAJA4 overexpression in COS cells increases cholesterol synthesis from acetate and increases HMG-CoA reductase activity and protein content without altering HMG-CoA reductase mRNA or stability, suggesting a co-translational chaperone effect on HMG-CoA reductase.","method":"Subtractive hybridization, adenoviral dominant-negative SREBP2 overexpression, COS cell overexpression with 14C-acetate cholesterol synthesis assay, Western blot, mRNA analysis","journal":"Biochimica et biophysica acta","confidence":"High","confidence_rationale":"Tier 1–2 — multiple orthogonal methods (gene expression regulation + functional overexpression + enzymatic activity assay) in a single rigorous study","pmids":["16950652"],"is_preprint":false},{"year":2012,"finding":"DNAJA4 promotes ApoE expression; miR-1908, miR-199a-5p, and miR-199a-3p convergently target DNAJA4 (and ApoE), and suppression of DNAJA4 by these miRNAs reduces ApoE levels, thereby promoting melanoma metastasis and angiogenesis.","method":"In vivo selection of human cancer cell populations, miRNA overexpression/inhibition, LNA treatment, in vitro and in vivo functional assays","journal":"Cell","confidence":"High","confidence_rationale":"Tier 2 — multiple orthogonal methods (in vivo selection, LNA inhibition, in vitro and in vivo metastasis assays) in a highly cited study","pmids":["23142051"],"is_preprint":false},{"year":2015,"finding":"C2238/αANP downregulates DNAJA4 via NPR-C receptor-dependent upregulation of miR-199a-3p and miR-199a-5p (mediated by ROS-dependent Egr-1 activation), and reduced DNAJA4 leads to decreased ApoE expression in vascular smooth muscle cells.","method":"miRNA overexpression/inhibition, NPR-C knockdown, Egr-1 knockdown, ROS inhibition, Western blot, real-time PCR in VSMCs","journal":"Cell death & disease","confidence":"Medium","confidence_rationale":"Tier 2 — multiple knockdowns with pathway rescue, single lab","pmids":["26720342"],"is_preprint":false},{"year":2018,"finding":"DNAJA4 deficiency (CRISPR/Cas9 knockout) in HaCaT keratinocytes enhances hyperthermia-induced NF-κB activation, promotes transcription of TNF-α and IL-1B, reduces cell survival and proliferation, and these phenotypes are reversed by NF-κB inhibitors, placing DNAJA4 as a negative regulator of NF-κB signaling under heat stress.","method":"CRISPR/Cas9 knockout, flow cytometry, MTS assay, rt-qPCR, Western blot, NF-κB inhibitor rescue experiments","journal":"Journal of dermatological science","confidence":"Medium","confidence_rationale":"Tier 2 — clean KO with defined phenotype and pathway rescue, single lab","pmids":["29807809"],"is_preprint":false},{"year":2020,"finding":"DNAJA4 regulates F-actin expression and cytoskeletal dynamics in HaCaT keratinocytes; DNAJA4 knockout increases F-actin levels and alters ROCK1 and RhoA expression profiles in response to hyperthermia, and also increases E-cadherin expression.","method":"CRISPR/Cas9 knockout, flow cytometry, immunofluorescence, Western blot","journal":"Chinese medical journal","confidence":"Medium","confidence_rationale":"Tier 2 — clean KO with defined cellular phenotype, single lab","pmids":["32925288"],"is_preprint":false},{"year":2020,"finding":"DNAJA4 deficiency in HaCaT keratinocytes further augments hyperthermia-induced Clusterin (CLU) and phospho-ERK expression; CLU and p-ERK serve as protective factors inhibiting apoptosis and maintaining cell cycle respectively, and CLU deficiency increases p-ERK expression, placing DNAJA4 upstream of CLU and ERK pathways during heat stress.","method":"CRISPR/Cas9 knockout, RNAi knockdown of CLU, PD98059 ERK inhibitor, RT-PCR, Western blot, flow cytometry, MTS assay","journal":"Journal of the European Academy of Dermatology and Venereology","confidence":"Medium","confidence_rationale":"Tier 2 — KO with downstream signaling pathway characterization and rescue, single lab","pmids":["32277496"],"is_preprint":false},{"year":2020,"finding":"Human DNAJA4 does not functionally complement the yeast ydj1Δ mutant for protection against doxorubicin, cisplatin, or heat shock (unlike DNAJA1 and DNAJA2), and DNAJA4 expression in wild-type yeast interferes with the cellular response to stress, indicating DNAJA4 has distinct substrate/functional specificity from other DNAJA family members.","method":"Yeast complementation assay (ydj1Δ rescue), drug sensitivity assays, heat shock assays","journal":"BioMed research international","confidence":"Medium","confidence_rationale":"Tier 2 — functional complementation assay in a defined genetic background with multiple stress conditions, single lab","pmids":["32149145"],"is_preprint":false},{"year":2023,"finding":"DNAJA4 suppresses epithelial-mesenchymal transition (EMT) and metastasis in nasopharyngeal carcinoma by recruiting the proteasome subunit PSMD2 to promote ubiquitin-proteasome-mediated degradation of MYH9 protein; overexpression of MYH9 reverses the anti-metastatic effects of DNAJA4, establishing a DNAJA4-PSMD2-MYH9 axis.","method":"DNAJA4 overexpression/knockdown, Co-IP, in vitro migration/invasion assays, in vivo lymph node and lung metastasis models, MYH9 rescue overexpression, ubiquitin-proteasome inhibitor experiments","journal":"Cell death & disease","confidence":"High","confidence_rationale":"Tier 1–2 — Co-IP identifying PSMD2 interaction, functional rescue with MYH9 overexpression, in vivo validation, multiple orthogonal methods","pmids":["37875476"],"is_preprint":false},{"year":2022,"finding":"EPC (fish) DNAJA4 is localized in the cytoplasm, is upregulated after Chinese giant salamander iridovirus (CGSIV) infection, promotes viral DNA replication when overexpressed, and physically interacts with CGSIV proliferating cell nuclear antigen (PCNA) as shown by Co-IP, GST-pulldown, and immunofluorescence.","method":"Subcellular localization (immunofluorescence), siRNA knockdown, overexpression, Co-IP, GST-pulldown, viral replication assays","journal":"Genes","confidence":"Medium","confidence_rationale":"Tier 2 — reciprocal Co-IP and GST-pulldown confirming PCNA interaction with functional overexpression/KD data, but in a non-mammalian fish cell line","pmids":["36672799"],"is_preprint":false},{"year":2025,"finding":"MSX1-induced upregulation of DNAJA4 (and CRYAB) promotes ubiquitin-independent proteasomal degradation of HBx protein and represses HBV gene expression and genome replication; overexpression of DNAJA4 alone promotes HBx degradation and suppresses HBV replication.","method":"DNAJA4 overexpression, Western blot for HBx protein stability, HBV replication assays, correlation with MSX1 expression","journal":"PLoS pathogens","confidence":"Medium","confidence_rationale":"Tier 2 — DNAJA4 overexpression with defined functional readout (HBx degradation and HBV suppression), single lab","pmids":["39883729"],"is_preprint":false},{"year":2022,"finding":"DNAJA4 affects proliferation, apoptosis, and enucleation during terminal erythropoiesis, and its expression is regulated by DNA methylation at its promoter; dysregulation of DNAJA4 expression is associated with erythroid disorders.","method":"Differential DNA methylation analysis, gene expression analysis during erythropoiesis, functional characterization of proliferation/apoptosis/enucleation phenotypes","journal":"Epigenomics","confidence":"Low","confidence_rationale":"Tier 3 — functional phenotype described but mechanistic pathway placement limited; single lab with primarily correlative methods","pmids":["36420716"],"is_preprint":false},{"year":2023,"finding":"Drosophila Droj2 (ortholog of human DNAJA1/DNAJA4) promotes dendrite pruning of C4da sensory neurons by genetically interacting with Arf102F (a GTP-binding protein involved in protein trafficking) and promoting downregulation of the cell-adhesion molecule Neuroglian prior to dendrite severing.","method":"Drosophila genetics (loss-of-function, epistasis), live imaging, immunofluorescence","journal":"International journal of molecular sciences","confidence":"Low","confidence_rationale":"Tier 3 — genetic epistasis in Drosophila ortholog (Droj2 is orthologous to both DNAJA1 and DNAJA4, not specifically DNAJA4), single lab","pmids":["37686022"],"is_preprint":false}],"current_model":"DNAJA4 is an HSP40/DnaJ family co-chaperone with SREBP2-regulated expression that promotes cholesterol synthesis via co-translational facilitation of HMG-CoA reductase, suppresses cancer cell EMT and metastasis by recruiting PSMD2 to drive ubiquitin-proteasome degradation of MYH9, promotes ApoE expression (itself targeted by miR-199a and miR-1908), negatively regulates NF-κB signaling and F-actin dynamics (via RhoA/ROCK1) under heat stress in keratinocytes, and facilitates ubiquitin-independent proteasomal degradation of HBV HBx protein downstream of MSX1."},"narrative":{"teleology":[{"year":2006,"claim":"Establishing DNAJA4 as a SREBP2-regulated co-chaperone that enhances cholesterol biosynthesis resolved how a DnaJ protein could be transcriptionally coupled to lipid homeostasis and identified a co-translational mechanism for increasing HMG-CoA reductase protein without altering its mRNA.","evidence":"Subtractive hybridization, dominant-negative SREBP2 adenoviral expression, COS cell overexpression with 14C-acetate incorporation, Western blot, and mRNA analysis","pmids":["16950652"],"confidence":"High","gaps":["Direct physical interaction between DNAJA4 and nascent HMG-CoA reductase not demonstrated","HSP70 partner identity for this co-translational function unknown","In vivo cholesterol phenotype in DNAJA4-deficient animals not tested"]},{"year":2012,"claim":"Demonstrating that miR-1908, miR-199a-5p, and miR-199a-3p convergently suppress DNAJA4 and ApoE to promote melanoma metastasis placed DNAJA4 in a miRNA-regulated metastasis network and identified its role in sustaining ApoE expression.","evidence":"In vivo selection of metastatic human cancer cell populations, LNA inhibition, miRNA overexpression/inhibition, in vitro and in vivo metastasis assays","pmids":["23142051"],"confidence":"High","gaps":["Mechanism by which DNAJA4 promotes ApoE expression not elucidated","Whether DNAJA4 chaperone activity is required for ApoE regulation not tested"]},{"year":2015,"claim":"Identifying C2238/αANP-driven upregulation of miR-199a via ROS-Egr-1 as a pathway that suppresses DNAJA4 and consequently ApoE in vascular smooth muscle cells extended the miRNA-DNAJA4-ApoE axis to cardiovascular biology.","evidence":"miRNA overexpression/inhibition, NPR-C and Egr-1 knockdown, ROS inhibition, Western blot and RT-PCR in VSMCs","pmids":["26720342"],"confidence":"Medium","gaps":["Single-lab finding without independent replication","Direct DNAJA4 3′-UTR reporter validation not shown in VSMCs","In vivo cardiovascular phenotype of DNAJA4 loss not examined"]},{"year":2018,"claim":"CRISPR knockout of DNAJA4 in keratinocytes revealed it as a negative regulator of NF-κB signaling under heat stress, linking this co-chaperone to inflammatory cytokine control and cell survival during thermal injury.","evidence":"CRISPR/Cas9 KO in HaCaT cells, NF-κB inhibitor rescue, flow cytometry, MTS assay, RT-qPCR, Western blot","pmids":["29807809"],"confidence":"Medium","gaps":["Direct molecular target through which DNAJA4 suppresses NF-κB not identified","Whether HSP70 partnership is required for NF-κB regulation unknown","In vivo skin phenotype not assessed"]},{"year":2020,"claim":"Extending the keratinocyte KO model showed DNAJA4 restrains RhoA/ROCK1-dependent F-actin dynamics and modulates CLU/ERK protective signaling during hyperthermia, broadening its stress-response role beyond NF-κB to cytoskeletal and survival pathways.","evidence":"CRISPR/Cas9 KO in HaCaT cells, immunofluorescence, Western blot, CLU siRNA knockdown, ERK inhibitor rescue","pmids":["32925288","32277496"],"confidence":"Medium","gaps":["Whether DNAJA4 directly binds RhoA or ROCK1 not tested","Relationship between NF-κB and cytoskeletal phenotypes in KO cells not dissected","CLU and ERK changes may be compensatory rather than direct"]},{"year":2020,"claim":"Yeast complementation experiments demonstrated that DNAJA4 cannot substitute for Ydj1 under stress, establishing that DNAJA4 has distinct substrate specificity compared to DNAJA1 and DNAJA2.","evidence":"ydj1Δ yeast complementation with human DnaJA proteins, drug sensitivity and heat shock assays","pmids":["32149145"],"confidence":"Medium","gaps":["Specific structural determinants of DNAJA4 substrate selectivity not mapped","Whether DNAJA4 cooperates with a different HSP70 partner than DNAJA1/A2 not addressed"]},{"year":2023,"claim":"Discovery that DNAJA4 recruits the proteasome subunit PSMD2 to drive ubiquitin-proteasome degradation of MYH9, thereby suppressing EMT and metastasis in nasopharyngeal carcinoma, provided the first defined proteasome-targeting mechanism for DNAJA4.","evidence":"Co-IP identifying PSMD2 interaction, DNAJA4 overexpression/knockdown, MYH9 rescue, in vivo metastasis models, proteasome inhibitor experiments","pmids":["37875476"],"confidence":"High","gaps":["Whether DNAJA4 directly ubiquitinates MYH9 or recruits an E3 ligase not clarified","Structural basis for PSMD2 recruitment unknown","Generality of PSMD2-mediated degradation to other DNAJA4 substrates not tested"]},{"year":2025,"claim":"Showing that MSX1-induced DNAJA4 promotes ubiquitin-independent proteasomal degradation of HBV HBx protein demonstrated a second proteasome-targeting function and an antiviral role for DNAJA4.","evidence":"DNAJA4 overexpression, HBx protein stability by Western blot, HBV replication assays, correlation with MSX1","pmids":["39883729"],"confidence":"Medium","gaps":["Direct physical interaction between DNAJA4 and HBx not demonstrated by reciprocal Co-IP or pulldown","Ubiquitin-independent degradation mechanism (proteasome subunit involvement) not defined","Single-lab finding without independent validation"]},{"year":null,"claim":"The identity of the HSP70 partner(s) through which DNAJA4 exerts its co-chaperone functions, the structural basis for its distinct substrate specificity relative to DNAJA1/A2, and whether its proteasome-targeting activities (via PSMD2 for MYH9; ubiquitin-independent for HBx) reflect a unified or context-dependent mechanism remain unresolved.","evidence":"","pmids":[],"confidence":"High","gaps":["No HSP70 partner identified for any DNAJA4 function","No structural or domain-mapping studies on DNAJA4 substrate selectivity","Relationship between cholesterol co-translational function and proteasome-targeting function not explored"]}],"mechanism_profile":{"molecular_activity":[{"term_id":"GO:0044183","term_label":"protein folding chaperone","supporting_discovery_ids":[0,7,9]},{"term_id":"GO:0098772","term_label":"molecular function regulator activity","supporting_discovery_ids":[3,7,9]}],"localization":[{"term_id":"GO:0005829","term_label":"cytosol","supporting_discovery_ids":[8]}],"pathway":[{"term_id":"GO:0140096","term_label":"catalytic activity, acting on a protein","supporting_discovery_ids":[7,9]},{"term_id":"R-HSA-1430728","term_label":"Metabolism","supporting_discovery_ids":[0]},{"term_id":"R-HSA-392499","term_label":"Metabolism of proteins","supporting_discovery_ids":[0,7,9]},{"term_id":"R-HSA-162582","term_label":"Signal Transduction","supporting_discovery_ids":[3,4]},{"term_id":"R-HSA-1643685","term_label":"Disease","supporting_discovery_ids":[1,7]}],"complexes":[],"partners":["PSMD2","MYH9","HMGCR"],"other_free_text":[]},"mechanistic_narrative":"DNAJA4 is an HSP40/DnaJ family co-chaperone with functionally distinct substrate specificity that operates at the intersection of cholesterol homeostasis, protein quality control, cytoskeletal regulation, and stress signaling. Its expression is transcriptionally controlled by SREBP2, and DNAJA4 promotes cholesterol synthesis by increasing HMG-CoA reductase protein content through a co-translational chaperone mechanism without altering mRNA or protein stability [PMID:16950652]. DNAJA4 suppresses epithelial–mesenchymal transition and metastasis by recruiting the proteasome subunit PSMD2 to drive ubiquitin-proteasome degradation of the cytoskeletal protein MYH9 [PMID:37875476], negatively regulates NF-κB signaling and RhoA/ROCK1-dependent F-actin dynamics under heat stress in keratinocytes [PMID:29807809, PMID:32925288], and facilitates ubiquitin-independent proteasomal degradation of HBV HBx protein downstream of MSX1 [PMID:39883729]. DNAJA4 also promotes ApoE expression, and its suppression by miR-199a and miR-1908 enhances melanoma metastasis [PMID:23142051]."},"prefetch_data":{"uniprot":{"accession":"Q8WW22","full_name":"DnaJ homolog subfamily A member 4","aliases":[],"length_aa":397,"mass_kda":44.8,"function":"","subcellular_location":"Membrane","url":"https://www.uniprot.org/uniprotkb/Q8WW22/entry"},"depmap":{"release":"DepMap","has_data":true,"is_common_essential":false,"resolved_as":"","url":"https://depmap.org/portal/gene/DNAJA4","classification":"Not Classified","n_dependent_lines":0,"n_total_lines":1208,"dependency_fraction":0.0},"opencell":{"profiled":false,"resolved_as":"","ensg_id":"","cell_line_id":"","localizations":[],"interactors":[],"url":"https://opencell.sf.czbiohub.org/search/DNAJA4","total_profiled":1310},"omim":[],"hpa":{"profiled":true,"resolved_as":"","reliability":"Approved","locations":[{"location":"Plasma membrane","reliability":"Approved"},{"location":"Cytosol","reliability":"Approved"},{"location":"Nuclear membrane","reliability":"Additional"},{"location":"Primary cilium","reliability":"Additional"},{"location":"Centriolar satellite","reliability":"Additional"},{"location":"Basal body","reliability":"Additional"}],"tissue_specificity":"Tissue enhanced","tissue_distribution":"Detected in all","driving_tissues":[{"tissue":"tongue","ntpm":135.1}],"url":"https://www.proteinatlas.org/search/DNAJA4"},"hgnc":{"alias_symbol":["PRO1472"],"prev_symbol":[]},"alphafold":{"accession":"Q8WW22","domains":[{"cath_id":"1.10.287.110","chopping":"6-76","consensus_level":"high","plddt":84.2742,"start":6,"end":76},{"cath_id":"2.60.260.20","chopping":"253-329","consensus_level":"high","plddt":95.2022,"start":253,"end":329}],"viewer_url":"https://alphafold.ebi.ac.uk/entry/Q8WW22","model_url":"https://alphafold.ebi.ac.uk/files/AF-Q8WW22-F1-model_v6.cif","pae_url":"https://alphafold.ebi.ac.uk/files/AF-Q8WW22-F1-predicted_aligned_error_v6.png","plddt_mean":84.44},"mouse_models":{"mgi_url":"https://www.informatics.jax.org/marker/summary?nomen=DNAJA4","jax_strain_url":"https://www.jax.org/strain/search?query=DNAJA4"},"sequence":{"accession":"Q8WW22","fasta_url":"https://rest.uniprot.org/uniprotkb/Q8WW22.fasta","uniprot_url":"https://www.uniprot.org/uniprotkb/Q8WW22/entry","alphafold_viewer_url":"https://alphafold.ebi.ac.uk/entry/Q8WW22"}},"corpus_meta":[{"pmid":"23142051","id":"PMC_23142051","title":"Convergent multi-miRNA targeting of ApoE drives LRP1/LRP8-dependent melanoma metastasis and angiogenesis.","date":"2012","source":"Cell","url":"https://pubmed.ncbi.nlm.nih.gov/23142051","citation_count":344,"is_preprint":false},{"pmid":"22419069","id":"PMC_22419069","title":"Genome-wide DNA methylation studies suggest distinct DNA methylation patterns in pediatric embryonal and alveolar rhabdomyosarcomas.","date":"2012","source":"Epigenetics","url":"https://pubmed.ncbi.nlm.nih.gov/22419069","citation_count":53,"is_preprint":false},{"pmid":"27736938","id":"PMC_27736938","title":"Heat Stress and Lipopolysaccharide Stimulation of Chicken Macrophage-Like Cell Line Activates Expression of Distinct Sets of Genes.","date":"2016","source":"PloS one","url":"https://pubmed.ncbi.nlm.nih.gov/27736938","citation_count":47,"is_preprint":false},{"pmid":"27330572","id":"PMC_27330572","title":"Genome-wide placental DNA methylation analysis of severely growth-discordant monochorionic twins reveals novel epigenetic targets for intrauterine growth restriction.","date":"2016","source":"Clinical epigenetics","url":"https://pubmed.ncbi.nlm.nih.gov/27330572","citation_count":45,"is_preprint":false},{"pmid":"20663983","id":"PMC_20663983","title":"Discovery and characterization of nutritionally regulated genes associated with muscle growth in Atlantic salmon.","date":"2010","source":"Physiological genomics","url":"https://pubmed.ncbi.nlm.nih.gov/20663983","citation_count":45,"is_preprint":false},{"pmid":"31295760","id":"PMC_31295760","title":"Dysplastic oral leukoplakia is molecularly distinct from leukoplakia without dysplasia.","date":"2019","source":"Oral diseases","url":"https://pubmed.ncbi.nlm.nih.gov/31295760","citation_count":44,"is_preprint":false},{"pmid":"16735990","id":"PMC_16735990","title":"Fine mapping of the keratoconus with cataract locus on chromosome 15q and candidate gene analysis.","date":"2006","source":"Molecular vision","url":"https://pubmed.ncbi.nlm.nih.gov/16735990","citation_count":39,"is_preprint":false},{"pmid":"14969731","id":"PMC_14969731","title":"Profiling of genes associated with transcriptional responses in mouse hippocampus after transient forebrain ischemia using high-density oligonucleotide DNA array.","date":"2004","source":"Brain research. 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disease","url":"https://pubmed.ncbi.nlm.nih.gov/41821648","citation_count":0,"is_preprint":false}],"cost":{"stage1":{"model":"claude-sonnet-4-6","input_tokens":22690,"output_tokens":3040,"usd":0.056835},"stage2":{"model":"claude-opus-4-6","input_tokens":6414,"output_tokens":2552,"usd":0.143805},"total_usd":0.20064,"stage1_batch_id":"msgbatch_0118RScg3WGaGkaZRtWZbtce","stage2_batch_id":"msgbatch_01Cpfzvtbj42aqp5oYZ5Te2s","note":"batch pricing = 50% of standard"},"stage1_raw":"```json\n{\n  \"discoveries\": [\n    {\n      \"year\": 2006,\n      \"finding\": \"DNAJA4 is a SREBP2-regulated chaperone: its mRNA expression is controlled by SREBP2 (demonstrated via dominant-negative SREBP2 adenoviral overexpression abolishing cholesterol-regulated changes in DNAJA4 expression), and DNAJA4 overexpression in COS cells increases cholesterol synthesis from acetate and increases HMG-CoA reductase activity and protein content without altering HMG-CoA reductase mRNA or stability, suggesting a co-translational chaperone effect on HMG-CoA reductase.\",\n      \"method\": \"Subtractive hybridization, adenoviral dominant-negative SREBP2 overexpression, COS cell overexpression with 14C-acetate cholesterol synthesis assay, Western blot, mRNA analysis\",\n      \"journal\": \"Biochimica et biophysica acta\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1–2 — multiple orthogonal methods (gene expression regulation + functional overexpression + enzymatic activity assay) in a single rigorous study\",\n      \"pmids\": [\"16950652\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2012,\n      \"finding\": \"DNAJA4 promotes ApoE expression; miR-1908, miR-199a-5p, and miR-199a-3p convergently target DNAJA4 (and ApoE), and suppression of DNAJA4 by these miRNAs reduces ApoE levels, thereby promoting melanoma metastasis and angiogenesis.\",\n      \"method\": \"In vivo selection of human cancer cell populations, miRNA overexpression/inhibition, LNA treatment, in vitro and in vivo functional assays\",\n      \"journal\": \"Cell\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 — multiple orthogonal methods (in vivo selection, LNA inhibition, in vitro and in vivo metastasis assays) in a highly cited study\",\n      \"pmids\": [\"23142051\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2015,\n      \"finding\": \"C2238/αANP downregulates DNAJA4 via NPR-C receptor-dependent upregulation of miR-199a-3p and miR-199a-5p (mediated by ROS-dependent Egr-1 activation), and reduced DNAJA4 leads to decreased ApoE expression in vascular smooth muscle cells.\",\n      \"method\": \"miRNA overexpression/inhibition, NPR-C knockdown, Egr-1 knockdown, ROS inhibition, Western blot, real-time PCR in VSMCs\",\n      \"journal\": \"Cell death & disease\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 — multiple knockdowns with pathway rescue, single lab\",\n      \"pmids\": [\"26720342\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2018,\n      \"finding\": \"DNAJA4 deficiency (CRISPR/Cas9 knockout) in HaCaT keratinocytes enhances hyperthermia-induced NF-κB activation, promotes transcription of TNF-α and IL-1B, reduces cell survival and proliferation, and these phenotypes are reversed by NF-κB inhibitors, placing DNAJA4 as a negative regulator of NF-κB signaling under heat stress.\",\n      \"method\": \"CRISPR/Cas9 knockout, flow cytometry, MTS assay, rt-qPCR, Western blot, NF-κB inhibitor rescue experiments\",\n      \"journal\": \"Journal of dermatological science\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 — clean KO with defined phenotype and pathway rescue, single lab\",\n      \"pmids\": [\"29807809\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2020,\n      \"finding\": \"DNAJA4 regulates F-actin expression and cytoskeletal dynamics in HaCaT keratinocytes; DNAJA4 knockout increases F-actin levels and alters ROCK1 and RhoA expression profiles in response to hyperthermia, and also increases E-cadherin expression.\",\n      \"method\": \"CRISPR/Cas9 knockout, flow cytometry, immunofluorescence, Western blot\",\n      \"journal\": \"Chinese medical journal\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 — clean KO with defined cellular phenotype, single lab\",\n      \"pmids\": [\"32925288\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2020,\n      \"finding\": \"DNAJA4 deficiency in HaCaT keratinocytes further augments hyperthermia-induced Clusterin (CLU) and phospho-ERK expression; CLU and p-ERK serve as protective factors inhibiting apoptosis and maintaining cell cycle respectively, and CLU deficiency increases p-ERK expression, placing DNAJA4 upstream of CLU and ERK pathways during heat stress.\",\n      \"method\": \"CRISPR/Cas9 knockout, RNAi knockdown of CLU, PD98059 ERK inhibitor, RT-PCR, Western blot, flow cytometry, MTS assay\",\n      \"journal\": \"Journal of the European Academy of Dermatology and Venereology\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 — KO with downstream signaling pathway characterization and rescue, single lab\",\n      \"pmids\": [\"32277496\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2020,\n      \"finding\": \"Human DNAJA4 does not functionally complement the yeast ydj1Δ mutant for protection against doxorubicin, cisplatin, or heat shock (unlike DNAJA1 and DNAJA2), and DNAJA4 expression in wild-type yeast interferes with the cellular response to stress, indicating DNAJA4 has distinct substrate/functional specificity from other DNAJA family members.\",\n      \"method\": \"Yeast complementation assay (ydj1Δ rescue), drug sensitivity assays, heat shock assays\",\n      \"journal\": \"BioMed research international\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 — functional complementation assay in a defined genetic background with multiple stress conditions, single lab\",\n      \"pmids\": [\"32149145\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2023,\n      \"finding\": \"DNAJA4 suppresses epithelial-mesenchymal transition (EMT) and metastasis in nasopharyngeal carcinoma by recruiting the proteasome subunit PSMD2 to promote ubiquitin-proteasome-mediated degradation of MYH9 protein; overexpression of MYH9 reverses the anti-metastatic effects of DNAJA4, establishing a DNAJA4-PSMD2-MYH9 axis.\",\n      \"method\": \"DNAJA4 overexpression/knockdown, Co-IP, in vitro migration/invasion assays, in vivo lymph node and lung metastasis models, MYH9 rescue overexpression, ubiquitin-proteasome inhibitor experiments\",\n      \"journal\": \"Cell death & disease\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1–2 — Co-IP identifying PSMD2 interaction, functional rescue with MYH9 overexpression, in vivo validation, multiple orthogonal methods\",\n      \"pmids\": [\"37875476\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2022,\n      \"finding\": \"EPC (fish) DNAJA4 is localized in the cytoplasm, is upregulated after Chinese giant salamander iridovirus (CGSIV) infection, promotes viral DNA replication when overexpressed, and physically interacts with CGSIV proliferating cell nuclear antigen (PCNA) as shown by Co-IP, GST-pulldown, and immunofluorescence.\",\n      \"method\": \"Subcellular localization (immunofluorescence), siRNA knockdown, overexpression, Co-IP, GST-pulldown, viral replication assays\",\n      \"journal\": \"Genes\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 — reciprocal Co-IP and GST-pulldown confirming PCNA interaction with functional overexpression/KD data, but in a non-mammalian fish cell line\",\n      \"pmids\": [\"36672799\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2025,\n      \"finding\": \"MSX1-induced upregulation of DNAJA4 (and CRYAB) promotes ubiquitin-independent proteasomal degradation of HBx protein and represses HBV gene expression and genome replication; overexpression of DNAJA4 alone promotes HBx degradation and suppresses HBV replication.\",\n      \"method\": \"DNAJA4 overexpression, Western blot for HBx protein stability, HBV replication assays, correlation with MSX1 expression\",\n      \"journal\": \"PLoS pathogens\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 — DNAJA4 overexpression with defined functional readout (HBx degradation and HBV suppression), single lab\",\n      \"pmids\": [\"39883729\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2022,\n      \"finding\": \"DNAJA4 affects proliferation, apoptosis, and enucleation during terminal erythropoiesis, and its expression is regulated by DNA methylation at its promoter; dysregulation of DNAJA4 expression is associated with erythroid disorders.\",\n      \"method\": \"Differential DNA methylation analysis, gene expression analysis during erythropoiesis, functional characterization of proliferation/apoptosis/enucleation phenotypes\",\n      \"journal\": \"Epigenomics\",\n      \"confidence\": \"Low\",\n      \"confidence_rationale\": \"Tier 3 — functional phenotype described but mechanistic pathway placement limited; single lab with primarily correlative methods\",\n      \"pmids\": [\"36420716\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2023,\n      \"finding\": \"Drosophila Droj2 (ortholog of human DNAJA1/DNAJA4) promotes dendrite pruning of C4da sensory neurons by genetically interacting with Arf102F (a GTP-binding protein involved in protein trafficking) and promoting downregulation of the cell-adhesion molecule Neuroglian prior to dendrite severing.\",\n      \"method\": \"Drosophila genetics (loss-of-function, epistasis), live imaging, immunofluorescence\",\n      \"journal\": \"International journal of molecular sciences\",\n      \"confidence\": \"Low\",\n      \"confidence_rationale\": \"Tier 3 — genetic epistasis in Drosophila ortholog (Droj2 is orthologous to both DNAJA1 and DNAJA4, not specifically DNAJA4), single lab\",\n      \"pmids\": [\"37686022\"],\n      \"is_preprint\": false\n    }\n  ],\n  \"current_model\": \"DNAJA4 is an HSP40/DnaJ family co-chaperone with SREBP2-regulated expression that promotes cholesterol synthesis via co-translational facilitation of HMG-CoA reductase, suppresses cancer cell EMT and metastasis by recruiting PSMD2 to drive ubiquitin-proteasome degradation of MYH9, promotes ApoE expression (itself targeted by miR-199a and miR-1908), negatively regulates NF-κB signaling and F-actin dynamics (via RhoA/ROCK1) under heat stress in keratinocytes, and facilitates ubiquitin-independent proteasomal degradation of HBV HBx protein downstream of MSX1.\"\n}\n```","stage2_raw":"```json\n{\n  \"mechanistic_narrative\": \"DNAJA4 is an HSP40/DnaJ family co-chaperone with functionally distinct substrate specificity that operates at the intersection of cholesterol homeostasis, protein quality control, cytoskeletal regulation, and stress signaling. Its expression is transcriptionally controlled by SREBP2, and DNAJA4 promotes cholesterol synthesis by increasing HMG-CoA reductase protein content through a co-translational chaperone mechanism without altering mRNA or protein stability [PMID:16950652]. DNAJA4 suppresses epithelial–mesenchymal transition and metastasis by recruiting the proteasome subunit PSMD2 to drive ubiquitin-proteasome degradation of the cytoskeletal protein MYH9 [PMID:37875476], negatively regulates NF-κB signaling and RhoA/ROCK1-dependent F-actin dynamics under heat stress in keratinocytes [PMID:29807809, PMID:32925288], and facilitates ubiquitin-independent proteasomal degradation of HBV HBx protein downstream of MSX1 [PMID:39883729]. DNAJA4 also promotes ApoE expression, and its suppression by miR-199a and miR-1908 enhances melanoma metastasis [PMID:23142051].\",\n  \"teleology\": [\n    {\n      \"year\": 2006,\n      \"claim\": \"Establishing DNAJA4 as a SREBP2-regulated co-chaperone that enhances cholesterol biosynthesis resolved how a DnaJ protein could be transcriptionally coupled to lipid homeostasis and identified a co-translational mechanism for increasing HMG-CoA reductase protein without altering its mRNA.\",\n      \"evidence\": \"Subtractive hybridization, dominant-negative SREBP2 adenoviral expression, COS cell overexpression with 14C-acetate incorporation, Western blot, and mRNA analysis\",\n      \"pmids\": [\"16950652\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Direct physical interaction between DNAJA4 and nascent HMG-CoA reductase not demonstrated\", \"HSP70 partner identity for this co-translational function unknown\", \"In vivo cholesterol phenotype in DNAJA4-deficient animals not tested\"]\n    },\n    {\n      \"year\": 2012,\n      \"claim\": \"Demonstrating that miR-1908, miR-199a-5p, and miR-199a-3p convergently suppress DNAJA4 and ApoE to promote melanoma metastasis placed DNAJA4 in a miRNA-regulated metastasis network and identified its role in sustaining ApoE expression.\",\n      \"evidence\": \"In vivo selection of metastatic human cancer cell populations, LNA inhibition, miRNA overexpression/inhibition, in vitro and in vivo metastasis assays\",\n      \"pmids\": [\"23142051\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Mechanism by which DNAJA4 promotes ApoE expression not elucidated\", \"Whether DNAJA4 chaperone activity is required for ApoE regulation not tested\"]\n    },\n    {\n      \"year\": 2015,\n      \"claim\": \"Identifying C2238/αANP-driven upregulation of miR-199a via ROS-Egr-1 as a pathway that suppresses DNAJA4 and consequently ApoE in vascular smooth muscle cells extended the miRNA-DNAJA4-ApoE axis to cardiovascular biology.\",\n      \"evidence\": \"miRNA overexpression/inhibition, NPR-C and Egr-1 knockdown, ROS inhibition, Western blot and RT-PCR in VSMCs\",\n      \"pmids\": [\"26720342\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Single-lab finding without independent replication\", \"Direct DNAJA4 3′-UTR reporter validation not shown in VSMCs\", \"In vivo cardiovascular phenotype of DNAJA4 loss not examined\"]\n    },\n    {\n      \"year\": 2018,\n      \"claim\": \"CRISPR knockout of DNAJA4 in keratinocytes revealed it as a negative regulator of NF-κB signaling under heat stress, linking this co-chaperone to inflammatory cytokine control and cell survival during thermal injury.\",\n      \"evidence\": \"CRISPR/Cas9 KO in HaCaT cells, NF-κB inhibitor rescue, flow cytometry, MTS assay, RT-qPCR, Western blot\",\n      \"pmids\": [\"29807809\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Direct molecular target through which DNAJA4 suppresses NF-κB not identified\", \"Whether HSP70 partnership is required for NF-κB regulation unknown\", \"In vivo skin phenotype not assessed\"]\n    },\n    {\n      \"year\": 2020,\n      \"claim\": \"Extending the keratinocyte KO model showed DNAJA4 restrains RhoA/ROCK1-dependent F-actin dynamics and modulates CLU/ERK protective signaling during hyperthermia, broadening its stress-response role beyond NF-κB to cytoskeletal and survival pathways.\",\n      \"evidence\": \"CRISPR/Cas9 KO in HaCaT cells, immunofluorescence, Western blot, CLU siRNA knockdown, ERK inhibitor rescue\",\n      \"pmids\": [\"32925288\", \"32277496\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Whether DNAJA4 directly binds RhoA or ROCK1 not tested\", \"Relationship between NF-κB and cytoskeletal phenotypes in KO cells not dissected\", \"CLU and ERK changes may be compensatory rather than direct\"]\n    },\n    {\n      \"year\": 2020,\n      \"claim\": \"Yeast complementation experiments demonstrated that DNAJA4 cannot substitute for Ydj1 under stress, establishing that DNAJA4 has distinct substrate specificity compared to DNAJA1 and DNAJA2.\",\n      \"evidence\": \"ydj1Δ yeast complementation with human DnaJA proteins, drug sensitivity and heat shock assays\",\n      \"pmids\": [\"32149145\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Specific structural determinants of DNAJA4 substrate selectivity not mapped\", \"Whether DNAJA4 cooperates with a different HSP70 partner than DNAJA1/A2 not addressed\"]\n    },\n    {\n      \"year\": 2023,\n      \"claim\": \"Discovery that DNAJA4 recruits the proteasome subunit PSMD2 to drive ubiquitin-proteasome degradation of MYH9, thereby suppressing EMT and metastasis in nasopharyngeal carcinoma, provided the first defined proteasome-targeting mechanism for DNAJA4.\",\n      \"evidence\": \"Co-IP identifying PSMD2 interaction, DNAJA4 overexpression/knockdown, MYH9 rescue, in vivo metastasis models, proteasome inhibitor experiments\",\n      \"pmids\": [\"37875476\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Whether DNAJA4 directly ubiquitinates MYH9 or recruits an E3 ligase not clarified\", \"Structural basis for PSMD2 recruitment unknown\", \"Generality of PSMD2-mediated degradation to other DNAJA4 substrates not tested\"]\n    },\n    {\n      \"year\": 2025,\n      \"claim\": \"Showing that MSX1-induced DNAJA4 promotes ubiquitin-independent proteasomal degradation of HBV HBx protein demonstrated a second proteasome-targeting function and an antiviral role for DNAJA4.\",\n      \"evidence\": \"DNAJA4 overexpression, HBx protein stability by Western blot, HBV replication assays, correlation with MSX1\",\n      \"pmids\": [\"39883729\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Direct physical interaction between DNAJA4 and HBx not demonstrated by reciprocal Co-IP or pulldown\", \"Ubiquitin-independent degradation mechanism (proteasome subunit involvement) not defined\", \"Single-lab finding without independent validation\"]\n    },\n    {\n      \"year\": null,\n      \"claim\": \"The identity of the HSP70 partner(s) through which DNAJA4 exerts its co-chaperone functions, the structural basis for its distinct substrate specificity relative to DNAJA1/A2, and whether its proteasome-targeting activities (via PSMD2 for MYH9; ubiquitin-independent for HBx) reflect a unified or context-dependent mechanism remain unresolved.\",\n      \"evidence\": \"\",\n      \"pmids\": [],\n      \"confidence\": \"High\",\n      \"gaps\": [\"No HSP70 partner identified for any DNAJA4 function\", \"No structural or domain-mapping studies on DNAJA4 substrate selectivity\", \"Relationship between cholesterol co-translational function and proteasome-targeting function not explored\"]\n    }\n  ],\n  \"mechanism_profile\": {\n    \"molecular_activity\": [\n      {\"term_id\": \"GO:0044183\", \"supporting_discovery_ids\": [0, 7, 9]},\n      {\"term_id\": \"GO:0098772\", \"supporting_discovery_ids\": [3, 7, 9]}\n    ],\n    \"localization\": [\n      {\"term_id\": \"GO:0005829\", \"supporting_discovery_ids\": [8]}\n    ],\n    \"pathway\": [\n      {\"term_id\": \"GO:0140096\", \"supporting_discovery_ids\": [7, 9]},\n      {\"term_id\": \"R-HSA-1430728\", \"supporting_discovery_ids\": [0]},\n      {\"term_id\": \"R-HSA-392499\", \"supporting_discovery_ids\": [0, 7, 9]},\n      {\"term_id\": \"R-HSA-162582\", \"supporting_discovery_ids\": [3, 4]},\n      {\"term_id\": \"R-HSA-1643685\", \"supporting_discovery_ids\": [1, 7]}\n    ],\n    \"complexes\": [],\n    \"partners\": [\"PSMD2\", \"MYH9\", \"HMGCR\"],\n    \"other_free_text\": []\n  }\n}\n```"}