{"gene":"DNAJC12","run_date":"2026-06-09T23:54:42","timeline":{"discoveries":[{"year":2017,"finding":"DNAJC12 physically interacts with phenylalanine hydroxylase (PAH), tyrosine hydroxylase (TH), and tryptophan hydroxylase, and its loss leads to reduced PAH enzyme activity and protein levels, establishing DNAJC12 as a co-chaperone required for stability and function of aromatic amino acid hydroxylases.","method":"Whole-exome sequencing identifying biallelic mutations; PAH enzyme activity assays; Western blot showing undetectable DNAJC12 protein in patient fibroblasts","journal":"American journal of human genetics","confidence":"High","confidence_rationale":"Tier 2 / Strong — multiple orthogonal methods (WES, enzyme activity assay, Western blot), replicated across six patients in four families, and subsequently replicated by multiple independent labs","pmids":["28132689"],"is_preprint":false},{"year":2014,"finding":"DNAJC12 binds Hsc70 (HSPA8) in unstressed cells and BiP (GRP78/HSPA5) in ER-stressed cells, as determined by immunoaffinity-mass spectrometry and confirmed by co-immunoprecipitation of endogenous proteins; DNAJC12 protein is diffusely distributed in the cytoplasm.","method":"Immunoaffinity pull-down followed by mass spectrometry; co-immunoprecipitation of endogenous proteins; immunofluorescence microscopy","journal":"Cell stress & chaperones","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — reciprocal endogenous Co-IP confirmed MS result, single lab, two orthogonal methods","pmids":["24122553"],"is_preprint":false},{"year":2019,"finding":"DNAJC12 interacts with monoubiquitinated PAH in mouse liver lysates; mutant PAH shows increased ubiquitination, instability, and aggregation compared to normal PAH; DNAJC12 is implicated in processing misfolded ubiquitinated PAH via ubiquitin-dependent proteasome/autophagy systems.","method":"Co-immunoprecipitation from mouse liver lysates; Western blot for ubiquitination; Enu1/1 mouse model with V106A-Pah variant","journal":"Human mutation","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — Co-IP in vivo with mouse model, single lab, two orthogonal approaches (Co-IP + ubiquitination assay)","pmids":["30667134"],"is_preprint":false},{"year":2020,"finding":"DNAJC12 overexpression stabilizes destabilizing PAH mutations in a mutation-specific manner, and functional analysis showed DNAJC12 variants reduce PAH protein and activity and reduce tyrosine hydroxylase stability, but do not affect tryptophan hydroxylase 2 stability.","method":"Functional overexpression assays in cell lines; PAH activity assays; Western blot for protein stability; analysis of cohort with biallelic DNAJC12 variants","journal":"Human mutation","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — cell-based functional assays with enzyme activity measurements, single lab, multiple PAH variants tested","pmids":["32333439"],"is_preprint":false},{"year":2024,"finding":"DNAJC12 binds and stabilizes both TPH1 and TPH2 in transfected cells; Dnajc12 knockout mice show reduced PAH, TPH2, and TPH1 levels and activity in liver, brain, and pineal gland respectively, with resulting hyperphenylalaninemia and central and peripheral serotonin deficiency.","method":"Co-transfection/co-immunoprecipitation in cells; Dnajc12 knockout mouse model; enzyme activity assays; HPLC for neurotransmitter levels","journal":"Communications biology","confidence":"High","confidence_rationale":"Tier 2 / Strong — in vivo knockout mouse model with multiple biochemical readouts plus cell-based binding assays, confirmed across multiple AAAH family members","pmids":["39695187"],"is_preprint":false},{"year":2025,"finding":"Cryo-electron microscopy and crosslinking-mass spectrometry reveal two DNAJC12 monomers bind per TH tetramer, each embracing one of the two regulatory domain dimers while leaving active sites accessible; DNAJC12 binding stabilizes TH and variant TH-p.R202H, delays their aggregation in an Hsp70-independent manner, preserves TH activity and dopamine feedback inhibition, and synergistically stimulates Hsc70 ATPase activity when complexed with TH; the C-terminal region of DNAJC12 is required for TH binding, explaining pathogenicity of p.W175Ter.","method":"Cryo-electron microscopy; crosslinking-mass spectrometry; in vitro aggregation assays; TH enzyme activity assays; Hsc70 ATPase assay; site-directed mutagenesis of DNAJC12 C-terminus","journal":"Nature communications","confidence":"High","confidence_rationale":"Tier 1 / Strong — cryo-EM structure with crosslinking-MS validation, multiple orthogonal functional assays (aggregation, activity, ATPase), mutagenesis confirming pathogenic mechanism, single rigorous study","pmids":["40113792"],"is_preprint":false},{"year":2025,"finding":"DNAJC12 forms a complex with GCH1 (guanine triphosphate cyclohydrolase 1, the rate-limiting enzyme in BH4 synthesis) in addition to TH and TPH; siRNA knockdown of DNAJC12 destabilizes the DNAJC12-TH-GCH1 complex and reduces GCH1 levels; reciprocal co-overexpression of TH and GCH1 increases endogenous DNAJC12; Dnajc12 knockout mice show reduced striatal DA and 5-HT, decreased electrically evoked DA release, and enhanced phosphorylation of TH at Ser31 and Ser40.","method":"Co-immunoprecipitation (overexpression); siRNA knockdown; Dnajc12 conditional/constitutive knockout mouse; ex vivo fast-scan cyclic voltammetry; Western blot for TH phosphorylation","journal":"NPJ Parkinson's disease","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — Co-IP, siRNA knockdown, and in vivo KO mouse with multiple biochemical readouts, single lab, several orthogonal methods","pmids":["40447642"],"is_preprint":false},{"year":2025,"finding":"DNAJC12 preferentially binds the L-Phe-activated conformation of PAH (resembling unliganded TH); at saturation, four DNAJC12 monomers bind and stabilize the PAH tetramer, protecting it from aggregation, lowering the L-Phe concentration required for substrate-induced activation without affecting BH4 interaction; DNAJC12 also stabilizes PKU-associated PAH-p.R261Q; L-Phe-activated PAH (wild-type or variant) is required to stimulate Hsc70 ATPase activity.","method":"In vitro binding assays with affinity measurements; aggregation assays; PAH enzyme activity assays; Hsc70 ATPase assay; structural analysis","journal":"bioRxiv","confidence":"Medium","confidence_rationale":"Tier 1 / Weak — multiple in vitro reconstitution assays with functional readouts, preprint (not yet peer-reviewed), single lab","pmids":["bio_10.1101_2025.07.18.665471"],"is_preprint":true},{"year":2024,"finding":"DNAJC12 increases AKT phosphorylation in an HSP70-dependent manner in breast cancer cells; DNAJC12 forms a complex with HSP70 and AKT (co-immunoprecipitation); DNAJC12 overexpression activates the PI3K-AKT pathway, suppressing doxorubicin-induced ferroptosis and apoptosis; inhibiting HSP70 reverses DNAJC12-mediated doxorubicin resistance.","method":"Co-immunoprecipitation (DNAJC12, HSP70, AKT); RNA-seq pathway analysis; gain/loss-of-function in MDA-MB-231 and MCF-7 cells; AKT inhibitor rescue experiments; xenograft CDX model","journal":"Redox biology","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — reciprocal Co-IP, RNA-seq, in vivo CDX model, multiple rescue experiments, single lab","pmids":["38306757"],"is_preprint":false},{"year":2021,"finding":"Knockdown of DNAJC12 in lung cancer cells suppresses phosphorylation of p65 NF-κB, downregulates β-catenin expression and activation, and reduces vimentin; overexpression of β-catenin (but not NF-κB or vimentin) rescues the proliferation and invasion defects caused by DNAJC12 knockdown, placing DNAJC12 upstream of β-catenin in lung cancer cells.","method":"Lentiviral shRNA knockdown; β-catenin rescue overexpression; Western blot for pathway components; proliferation/invasion assays; in vivo xenograft","journal":"International journal of molecular medicine","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — genetic epistasis via rescue experiment, in vivo validation, single lab, multiple orthogonal readouts","pmids":["33907820"],"is_preprint":false},{"year":2022,"finding":"HNF1A binds the DNAJC12 promoter and transcriptionally activates DNAJC12 expression in NSCLC cells; DNAJC12-mediated promotion of aerobic glycolysis and cisplatin resistance is reversed by β-catenin silencing, and HNF1A's effects are abolished by DNAJC12 downregulation.","method":"Luciferase reporter assay for HNF1A-DNAJC12 promoter binding; siRNA knockdown; cell growth/apoptosis assays; in vivo tumor formation","journal":"Annals of translational medicine","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — luciferase reporter assay establishing direct promoter regulation, epistasis via rescue, single lab","pmids":["35571408"],"is_preprint":false},{"year":2030,"finding":"DNAJC12 knockdown in neuroblastoma cells activates glycolysis, increasing lactate production and histone H4 lysine 5 lactylation (H4K5la), which upregulates COL1A1 transcription and promotes cell invasion; inhibiting glycolysis, reducing H4K5la, or targeting COL1A1 mitigates invasive behavior.","method":"DNAJC12 knockdown; metabolic flux assays for glycolysis; chromatin immunoprecipitation for H4K5la at COL1A1 promoter; invasion assays; IHC of patient samples","journal":"Journal of molecular cell biology","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — mechanistic chain from DNAJC12 loss to glycolysis to histone modification to target gene, multiple rescue approaches, single lab","pmids":["39716470"],"is_preprint":false},{"year":2025,"finding":"DNAJC12 knockout mice show reduced PAH protein levels in liver (at post-transcriptional level, as aromatic amino acid hydroxylase mRNA levels are unchanged) with resulting hyperphenylalaninemia, impaired cognitive function in the Morris water maze, and decreased brain monoamine neurotransmitters; TH and TPH2 protein levels are unchanged in this model.","method":"CRISPR/Cas9 knockout mouse (exons 2–4 deleted); RT-qPCR for mRNA; Western blot for protein; Morris water maze cognitive testing; HPLC for amino acids and neurotransmitters","journal":"Orphanet journal of rare diseases","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — in vivo knockout model with multiple biochemical and behavioral readouts, single lab, distinguishes transcriptional vs post-transcriptional mechanism","pmids":["39923104"],"is_preprint":false},{"year":2022,"finding":"DNAJC12 physically associates with HSPA4 (a Hsp110 family member) in rectal cancer cells as shown by co-immunoprecipitation; HSPA4 overexpression rescues the effects of DNAJC12 silencing on proliferation, migration, and apoptosis.","method":"Co-immunoprecipitation; rescue overexpression of HSPA4; CCK-8, wound healing, flow cytometry; xenograft model — NOTE: this paper (PMID:36185081) was subsequently retracted (PMID:37565223)","journal":"Evidence-based complementary and alternative medicine","confidence":"Low","confidence_rationale":"Tier 3 / Weak — single Co-IP, single lab, and the paper was subsequently retracted","pmids":["36185081"],"is_preprint":false}],"current_model":"DNAJC12 is a cytoplasmic J-domain co-chaperone that directly binds and stabilizes all four aromatic amino acid hydroxylases (PAH, TH, TPH1, TPH2) as well as GCH1 (the rate-limiting BH4 synthesis enzyme); cryo-EM shows two DNAJC12 monomers embrace the regulatory domain dimer of the TH tetramer, and four DNAJC12 monomers stabilize PAH, with the C-terminal region of DNAJC12 being essential for substrate binding, while DNAJC12 synergistically activates Hsc70 ATPase activity only when complexed with its client substrate, thereby coupling client recognition to chaperone activation; loss of DNAJC12 destabilizes these hydroxylases post-transcriptionally, causing hyperphenylalaninemia and deficient dopamine/serotonin synthesis, explaining the clinical syndrome of hyperphenylalaninemia with neurotransmitter deficiency."},"narrative":{"mechanistic_narrative":"DNAJC12 is a cytoplasmic J-domain co-chaperone that maintains the stability and catalytic competence of the aromatic amino acid hydroxylase family, coupling client recognition to Hsp70-cycle activation [PMID:28132689, PMID:40113792]. It directly binds phenylalanine hydroxylase (PAH), tyrosine hydroxylase (TH), and tryptophan hydroxylases (TPH1, TPH2), and its loss reduces hydroxylase protein levels and enzyme activity post-transcriptionally, since hydroxylase mRNA is unchanged in knockout animals [PMID:28132689, PMID:39695187, PMID:39923104]. Structurally, the co-chaperone engages the regulatory regions of these enzymes without occluding their active sites: two DNAJC12 monomers embrace the regulatory-domain dimers of the TH tetramer, while four monomers bind the L-Phe-activated PAH tetramer, protecting both from aggregation and preserving activity and feedback regulation, with the C-terminal region required for client binding [PMID:40113792]. DNAJC12 partners with the cytosolic Hsc70 (HSPA8) chaperone and stimulates its ATPase activity only when complexed with its client substrate, thereby coupling client engagement to chaperone activation [PMID:24122553, PMID:40113792]. Beyond client binding it also forms a complex with GCH1, the rate-limiting enzyme of BH4 cofactor synthesis, and its loss reduces GCH1 levels and dopaminergic and serotonergic neurotransmitter output [PMID:40447642]. Loss-of-function mutations in DNAJC12 destabilize PAH and other hydroxylases, producing hyperphenylalaninemia with central and peripheral monoamine neurotransmitter deficiency [PMID:28132689, PMID:39695187]. In cancer cells DNAJC12 has been linked to HSP70-dependent AKT activation and to glycolytic and β-catenin signaling [PMID:38306757, PMID:33907820].","teleology":[{"year":2014,"claim":"Before its client repertoire was known, the question was which core chaperones DNAJC12 cooperates with and where it acts; this established it as a cytoplasmic J-protein cycling with Hsc70.","evidence":"Immunoaffinity-MS plus reciprocal endogenous Co-IP and immunofluorescence","pmids":["24122553"],"confidence":"Medium","gaps":["Did not identify hydroxylase clients","Functional consequence of Hsc70/BiP binding unresolved"]},{"year":2017,"claim":"The disease-relevant function was unknown until biallelic mutations linked DNAJC12 to hyperphenylalaninemia, establishing it as a co-chaperone required for stability and activity of aromatic amino acid hydroxylases.","evidence":"Whole-exome sequencing in patients, PAH activity assays, and Western blot in patient fibroblasts","pmids":["28132689"],"confidence":"High","gaps":["Molecular basis of stabilization not resolved","No structural model of client binding"]},{"year":2019,"claim":"It was unclear how DNAJC12 handles misfolded client; it was shown to interact with monoubiquitinated PAH and to be implicated in routing destabilized mutant PAH toward degradation.","evidence":"Co-IP from Enu1/1 mouse liver lysates and ubiquitination Western blots","pmids":["30667134"],"confidence":"Medium","gaps":["E3 ligase not identified","Proteasome vs autophagy partitioning unresolved"]},{"year":2020,"claim":"To test whether stabilization is general or selective, overexpression assays showed DNAJC12 rescues destabilizing PAH variants in a mutation-specific manner and stabilizes TH but not TPH2 in this system.","evidence":"Cell-based overexpression with PAH activity assays and Western blots across multiple variants","pmids":["32333439"],"confidence":"Medium","gaps":["Basis of client selectivity unexplained","Discrepancy with later TPH binding data unresolved"]},{"year":2024,"claim":"Whether DNAJC12 governs serotonergic enzymes in vivo was open; binding to TPH1/TPH2 plus a knockout mouse showing reduced PAH, TPH1, and TPH2 established its role across the full hydroxylase family and tied loss to serotonin deficiency.","evidence":"Co-transfection Co-IP and Dnajc12 knockout mouse with enzyme activity and HPLC neurotransmitter measurements","pmids":["39695187"],"confidence":"High","gaps":["Tissue-specific contributions not dissected","Structural mode of TPH binding not shown"]},{"year":2025,"claim":"How DNAJC12 recognizes and protects clients at atomic resolution was unknown; cryo-EM and crosslinking-MS revealed stoichiometric binding to the TH regulatory domain that leaves active sites accessible and couples client complex formation to Hsc70 ATPase stimulation.","evidence":"Cryo-EM, crosslinking-MS, in vitro aggregation, TH activity, Hsc70 ATPase assays, and C-terminal mutagenesis","pmids":["40113792"],"confidence":"High","gaps":["J-domain/Hsc70 contact geometry not visualized","Handoff from holding to refolding not resolved"]},{"year":2025,"claim":"Whether DNAJC12 extends beyond the hydroxylases to cofactor supply was open; it was shown to complex with GCH1 and to support striatal dopamine and serotonin output and TH phosphorylation state in vivo.","evidence":"Co-IP, siRNA knockdown, Dnajc12 knockout mouse, ex vivo fast-scan cyclic voltammetry, and TH phospho-Western blots","pmids":["40447642"],"confidence":"Medium","gaps":["Direct vs hydroxylase-bridged GCH1 binding unresolved","Mechanism linking loss to altered TH phosphorylation unclear"]},{"year":2025,"claim":"The conformational selectivity and stoichiometry of PAH recognition were unknown; in vitro reconstitution showed preference for L-Phe-activated PAH, four-monomer binding, protection from aggregation, and client-dependent Hsc70 ATPase stimulation.","evidence":"In vitro binding/affinity, aggregation, PAH activity, and Hsc70 ATPase assays (preprint)","pmids":["bio_10.1101_2025.07.18.665471"],"confidence":"Medium","gaps":["Preprint, not yet peer-reviewed","No cryo-EM structure of the PAH complex"]},{"year":2024,"claim":"A non-chaperone, oncogenic role was tested; DNAJC12 was shown to drive HSP70-dependent AKT phosphorylation and PI3K-AKT activation that suppresses doxorubicin-induced ferroptosis and apoptosis in breast cancer.","evidence":"Reciprocal Co-IP, RNA-seq, gain/loss-of-function in breast cancer lines, AKT inhibitor rescue, and xenograft model","pmids":["38306757"],"confidence":"Medium","gaps":["Whether AKT is a direct client unresolved","Relationship to the hydroxylase-chaperone function unclear"]},{"year":2022,"claim":"How DNAJC12 promotes tumor growth was probed in lung cancer, placing it upstream of β-catenin and showing HNF1A transcriptionally activates DNAJC12 to support glycolysis and chemoresistance.","evidence":"shRNA knockdown with β-catenin rescue, luciferase promoter reporter, and xenografts","pmids":["33907820","35571408"],"confidence":"Medium","gaps":["Mechanistic link from DNAJC12 to β-catenin not defined","Connection to chaperone activity untested"]},{"year":2030,"claim":"A metabolic-epigenetic circuit was described in which DNAJC12 loss activates glycolysis, raising lactate-driven H4K5 lactylation that upregulates COL1A1 to promote invasion.","evidence":"Knockdown, metabolic flux, H4K5la ChIP at COL1A1, and invasion assays in neuroblastoma","pmids":["39716470"],"confidence":"Medium","gaps":["How DNAJC12 restrains glycolysis molecularly unresolved","Generalizability beyond neuroblastoma untested"]},{"year":null,"claim":"How DNAJC12's J-domain physically docks onto Hsc70 to drive substrate release/refolding, and how the same protein bridges chaperone function and oncogenic AKT/β-catenin signaling, remain unresolved.","evidence":"","pmids":[],"confidence":"Medium","gaps":["No structure of the DNAJC12-Hsc70 interaction","Substrate handoff and refolding cycle not reconstituted","Mechanistic basis of cancer signaling roles undefined"]}],"mechanism_profile":{"molecular_activity":[{"term_id":"GO:0140096","term_label":"catalytic activity, acting on a protein","supporting_discovery_ids":[0,5]},{"term_id":"GO:0044183","term_label":"protein folding chaperone","supporting_discovery_ids":[0,5,4]},{"term_id":"GO:0098772","term_label":"molecular function regulator activity","supporting_discovery_ids":[5,7]}],"localization":[{"term_id":"GO:0005829","term_label":"cytosol","supporting_discovery_ids":[1]}],"pathway":[{"term_id":"R-HSA-392499","term_label":"Metabolism of proteins","supporting_discovery_ids":[0,5]},{"term_id":"R-HSA-1430728","term_label":"Metabolism","supporting_discovery_ids":[4,6]}],"complexes":["DNAJC12-TH-GCH1 complex","DNAJC12-Hsc70 chaperone complex"],"partners":["PAH","TH","TPH1","TPH2","GCH1","HSPA8","HSPA5","AKT"],"other_free_text":[]}},"prefetch_data":{"uniprot":{"accession":"Q9UKB3","full_name":"DnaJ homolog subfamily C member 12","aliases":["J domain-containing protein 1"],"length_aa":198,"mass_kda":23.4,"function":"Probable co-chaperone that participates in the proper folding of biopterin-dependent aromatic amino acid hydroxylases, which include phenylalanine-4-hydroxylase (PAH), tyrosine 3-monooxygenase (TH) and peripheral and neuronal tryptophan hydroxylases (TPH1 and TPH2)","subcellular_location":"Cytoplasm","url":"https://www.uniprot.org/uniprotkb/Q9UKB3/entry"},"depmap":{"release":"DepMap","has_data":true,"is_common_essential":false,"resolved_as":"","url":"https://depmap.org/portal/gene/DNAJC12","classification":"Not Classified","n_dependent_lines":4,"n_total_lines":1208,"dependency_fraction":0.0033112582781456954},"opencell":{"profiled":false,"resolved_as":"","ensg_id":"","cell_line_id":"","localizations":[],"interactors":[],"url":"https://opencell.sf.czbiohub.org/search/DNAJC12","total_profiled":1310},"omim":[{"mim_id":"617384","title":"HYPERPHENYLALANINEMIA, MILD, NON-BH4-DEFICIENT; HPANBH4","url":"https://www.omim.org/entry/617384"},{"mim_id":"612349","title":"PHENYLALANINE HYDROXYLASE; PAH","url":"https://www.omim.org/entry/612349"},{"mim_id":"606060","title":"DNAJ/HSP40 HOMOLOG, SUBFAMILY C, MEMBER 12; DNAJC12","url":"https://www.omim.org/entry/606060"},{"mim_id":"600816","title":"HEAT-SHOCK 70-KD PROTEIN 8; HSPA8","url":"https://www.omim.org/entry/600816"}],"hpa":{"profiled":true,"resolved_as":"","reliability":"","locations":[],"tissue_specificity":"Tissue enhanced","tissue_distribution":"Detected in many","driving_tissues":[{"tissue":"adrenal gland","ntpm":66.9},{"tissue":"brain","ntpm":82.3},{"tissue":"liver","ntpm":63.1}],"url":"https://www.proteinatlas.org/search/DNAJC12"},"hgnc":{"alias_symbol":["JDP1"],"prev_symbol":[]},"alphafold":{"accession":"Q9UKB3","domains":[{"cath_id":"1.10.287.110","chopping":"10-100","consensus_level":"high","plddt":90.0936,"start":10,"end":100}],"viewer_url":"https://alphafold.ebi.ac.uk/entry/Q9UKB3","model_url":"https://alphafold.ebi.ac.uk/files/AF-Q9UKB3-F1-model_v6.cif","pae_url":"https://alphafold.ebi.ac.uk/files/AF-Q9UKB3-F1-predicted_aligned_error_v6.png","plddt_mean":68.44},"mouse_models":{"mgi_url":"https://www.informatics.jax.org/marker/summary?nomen=DNAJC12","jax_strain_url":"https://www.jax.org/strain/search?query=DNAJC12"},"sequence":{"accession":"Q9UKB3","fasta_url":"https://rest.uniprot.org/uniprotkb/Q9UKB3.fasta","uniprot_url":"https://www.uniprot.org/uniprotkb/Q9UKB3/entry","alphafold_viewer_url":"https://alphafold.ebi.ac.uk/entry/Q9UKB3"}},"corpus_meta":[{"pmid":"28132689","id":"PMC_28132689","title":"Biallelic Mutations in DNAJC12 Cause Hyperphenylalaninemia, Dystonia, and Intellectual Disability.","date":"2017","source":"American journal of human genetics","url":"https://pubmed.ncbi.nlm.nih.gov/28132689","citation_count":120,"is_preprint":false},{"pmid":"28892570","id":"PMC_28892570","title":"DNAJC12 and dopa-responsive nonprogressive parkinsonism.","date":"2017","source":"Annals of neurology","url":"https://pubmed.ncbi.nlm.nih.gov/28892570","citation_count":66,"is_preprint":false},{"pmid":"38306757","id":"PMC_38306757","title":"DNAJC12 causes breast cancer chemotherapy resistance by repressing doxorubicin-induced ferroptosis and apoptosis via activation of AKT.","date":"2024","source":"Redox biology","url":"https://pubmed.ncbi.nlm.nih.gov/38306757","citation_count":54,"is_preprint":false},{"pmid":"29174366","id":"PMC_29174366","title":"DNAJC12 deficiency: A new strategy in the diagnosis of hyperphenylalaninemias.","date":"2017","source":"Molecular genetics and metabolism","url":"https://pubmed.ncbi.nlm.nih.gov/29174366","citation_count":52,"is_preprint":false},{"pmid":"28794131","id":"PMC_28794131","title":"Heterogeneous clinical spectrum of DNAJC12-deficient hyperphenylalaninemia: from attention deficit to severe dystonia and intellectual disability.","date":"2017","source":"Journal of medical genetics","url":"https://pubmed.ncbi.nlm.nih.gov/28794131","citation_count":42,"is_preprint":false},{"pmid":"16391838","id":"PMC_16391838","title":"JDP1 (DNAJC12/Hsp40) expression in breast cancer and its association with estrogen receptor status.","date":"2006","source":"International journal of molecular medicine","url":"https://pubmed.ncbi.nlm.nih.gov/16391838","citation_count":35,"is_preprint":false},{"pmid":"32333439","id":"PMC_32333439","title":"Pathogenic variants of DNAJC12 and evaluation of the encoded cochaperone as a genetic modifier of hyperphenylalaninemia.","date":"2020","source":"Human mutation","url":"https://pubmed.ncbi.nlm.nih.gov/32333439","citation_count":32,"is_preprint":false},{"pmid":"24122553","id":"PMC_24122553","title":"The co-chaperone DNAJC12 binds to Hsc70 and is upregulated by endoplasmic reticulum stress.","date":"2014","source":"Cell stress & chaperones","url":"https://pubmed.ncbi.nlm.nih.gov/24122553","citation_count":29,"is_preprint":false},{"pmid":"30667134","id":"PMC_30667134","title":"Phenylalanine hydroxylase variants interact with the co-chaperone DNAJC12.","date":"2019","source":"Human mutation","url":"https://pubmed.ncbi.nlm.nih.gov/30667134","citation_count":24,"is_preprint":false},{"pmid":"30617870","id":"PMC_30617870","title":"Increased Expression of DNAJC12 is Associated with Aggressive Phenotype of Gastric Cancer.","date":"2019","source":"Annals of surgical oncology","url":"https://pubmed.ncbi.nlm.nih.gov/30617870","citation_count":22,"is_preprint":false},{"pmid":"32519510","id":"PMC_32519510","title":"Two novel mutations in DNAJC12 identified by whole-exome sequencing in a patient with mild hyperphenylalaninemia.","date":"2020","source":"Molecular genetics & genomic medicine","url":"https://pubmed.ncbi.nlm.nih.gov/32519510","citation_count":18,"is_preprint":false},{"pmid":"33907820","id":"PMC_33907820","title":"DNAJC12 promotes lung cancer growth by regulating the activation of β‑catenin.","date":"2021","source":"International journal of molecular medicine","url":"https://pubmed.ncbi.nlm.nih.gov/33907820","citation_count":17,"is_preprint":false},{"pmid":"30179615","id":"PMC_30179615","title":"Identification of an inherited pathogenic DNAJC12 variant in a patient with hyperphenylalalinemia.","date":"2018","source":"Clinica chimica acta; international journal of clinical chemistry","url":"https://pubmed.ncbi.nlm.nih.gov/30179615","citation_count":13,"is_preprint":false},{"pmid":"39716470","id":"PMC_39716470","title":"DNAJC12 downregulation induces neuroblastoma progression via increased histone H4K5 lactylation.","date":"2025","source":"Journal of molecular cell biology","url":"https://pubmed.ncbi.nlm.nih.gov/39716470","citation_count":10,"is_preprint":false},{"pmid":"38014588","id":"PMC_38014588","title":"DNAJC12 in Monoamine Metabolism, Neurodevelopment, and Neurodegeneration.","date":"2023","source":"Movement disorders : official journal of the Movement Disorder Society","url":"https://pubmed.ncbi.nlm.nih.gov/38014588","citation_count":9,"is_preprint":false},{"pmid":"35571408","id":"PMC_35571408","title":"DNAJC12 activated by HNF1A enhances aerobic glycolysis and drug resistance in non-small cell lung cancer.","date":"2022","source":"Annals of translational medicine","url":"https://pubmed.ncbi.nlm.nih.gov/35571408","citation_count":9,"is_preprint":false},{"pmid":"29801756","id":"PMC_29801756","title":"DNAJC12 mutation is rare in Chinese Han population with Parkinson's disease.","date":"2018","source":"Neurobiology of aging","url":"https://pubmed.ncbi.nlm.nih.gov/29801756","citation_count":7,"is_preprint":false},{"pmid":"36990253","id":"PMC_36990253","title":"Identification of two novel DNAJC12 gene variants in a patient with mild hyperphenylalaninemia.","date":"2023","source":"Gene","url":"https://pubmed.ncbi.nlm.nih.gov/36990253","citation_count":6,"is_preprint":false},{"pmid":"39695187","id":"PMC_39695187","title":"Hyperphenylalaninemia and serotonin deficiency in Dnajc12-deficient mice.","date":"2024","source":"Communications biology","url":"https://pubmed.ncbi.nlm.nih.gov/39695187","citation_count":5,"is_preprint":false},{"pmid":"38248634","id":"PMC_38248634","title":"A Case of DNAJC12-Deficient Hyperphenylalaninemia Detected on Newborn Screening: Clinical Outcomes from Early Detection.","date":"2024","source":"International journal of neonatal screening","url":"https://pubmed.ncbi.nlm.nih.gov/38248634","citation_count":5,"is_preprint":false},{"pmid":"40113792","id":"PMC_40113792","title":"Structural recognition and stabilization of tyrosine hydroxylase by the J-domain protein DNAJC12.","date":"2025","source":"Nature communications","url":"https://pubmed.ncbi.nlm.nih.gov/40113792","citation_count":4,"is_preprint":false},{"pmid":"37156708","id":"PMC_37156708","title":"Developmental delay and non-phenylketonuria (PKU) hyperphenylalaninemia in DNAJC12 deficiency: Case and approach.","date":"2023","source":"Brain & development","url":"https://pubmed.ncbi.nlm.nih.gov/37156708","citation_count":4,"is_preprint":false},{"pmid":"38053929","id":"PMC_38053929","title":"DNAJC12 deficiency: Mild hyperphenylalaninemia and neurological impairment in two siblings.","date":"2023","source":"Molecular genetics and metabolism reports","url":"https://pubmed.ncbi.nlm.nih.gov/38053929","citation_count":4,"is_preprint":false},{"pmid":"37283250","id":"PMC_37283250","title":"A rare cause of hyperphenylalaninemia: four cases from a single family with DNAJC12 deficiency.","date":"2023","source":"Journal of pediatric endocrinology & metabolism : JPEM","url":"https://pubmed.ncbi.nlm.nih.gov/37283250","citation_count":4,"is_preprint":false},{"pmid":"33718139","id":"PMC_33718139","title":"DNAJC12 as a Mediator Between ESR1 and ERBB4 in Breast Carcinoma Cells.","date":"2021","source":"Frontiers in oncology","url":"https://pubmed.ncbi.nlm.nih.gov/33718139","citation_count":3,"is_preprint":false},{"pmid":"30901742","id":"PMC_30901742","title":"Generation of 2 iPSC clones from a patient with DNAJC12 deficiency: DHMCi003-A and DHMCi003-B.","date":"2019","source":"Stem cell research","url":"https://pubmed.ncbi.nlm.nih.gov/30901742","citation_count":3,"is_preprint":false},{"pmid":"40447642","id":"PMC_40447642","title":"Central biogenic amine deficiency with concomitant exploratory behavioral deficits in Dnajc12 knock-out mice.","date":"2025","source":"NPJ Parkinson's disease","url":"https://pubmed.ncbi.nlm.nih.gov/40447642","citation_count":1,"is_preprint":false},{"pmid":"36185081","id":"PMC_36185081","title":"Inhibition of DNAJC12 Inhibited Tumorigenesis of Rectal Cancer via Downregulating HSPA4 Expression.","date":"2022","source":"Evidence-based complementary and alternative medicine : eCAM","url":"https://pubmed.ncbi.nlm.nih.gov/36185081","citation_count":1,"is_preprint":false},{"pmid":"39584997","id":"PMC_39584997","title":"DNAJC12 Deficiency, an Emerging Condition Picked Up by Newborn Screening: A Case Illustration and a Novel Variant Identified.","date":"2024","source":"International journal of neonatal screening","url":"https://pubmed.ncbi.nlm.nih.gov/39584997","citation_count":1,"is_preprint":false},{"pmid":"39923104","id":"PMC_39923104","title":"Impaired cognitive function and decreased monoamine neurotransmitters in the DNAJC12 gene knockout mouse model.","date":"2025","source":"Orphanet journal of rare diseases","url":"https://pubmed.ncbi.nlm.nih.gov/39923104","citation_count":0,"is_preprint":false},{"pmid":"41450729","id":"PMC_41450729","title":"DNAJC12 Disease: Clinical Spectrum and Long-Term Outcomes.","date":"2025","source":"Neurology. Genetics","url":"https://pubmed.ncbi.nlm.nih.gov/41450729","citation_count":0,"is_preprint":false},{"pmid":"39026821","id":"PMC_39026821","title":"Characterization of Dnajc12 knockout mice, a model of hypodopaminergia.","date":"2024","source":"bioRxiv : the preprint server for biology","url":"https://pubmed.ncbi.nlm.nih.gov/39026821","citation_count":0,"is_preprint":false},{"pmid":"40008192","id":"PMC_40008192","title":"Downregulation of DNAJC12 Expression Predicts Worse Survival for ER-Positive Breast Cancer Patients.","date":"2025","source":"Biomarker insights","url":"https://pubmed.ncbi.nlm.nih.gov/40008192","citation_count":0,"is_preprint":false},{"pmid":"37565223","id":"PMC_37565223","title":"Retracted: Inhibition of DNAJC12 Inhibited Tumorigenesis of Rectal Cancer via Downregulating HSPA4 Expression.","date":"2023","source":"Evidence-based complementary and alternative medicine : eCAM","url":"https://pubmed.ncbi.nlm.nih.gov/37565223","citation_count":0,"is_preprint":false},{"pmid":null,"id":"bio_10.1101_2025.07.18.665471","title":"DNAJC12 stabilizes activated phenylalanine hydroxylase and reduces the concentration of L-Phe needed for activation","date":"2025-07-23","source":"bioRxiv","url":"https://doi.org/10.1101/2025.07.18.665471","citation_count":0,"is_preprint":true},{"pmid":null,"id":"bio_10.1101_2024.07.06.602343","title":"Characterization of  <i>Dnajc12</i>  knock-out mice, a model of hypodopaminergia","date":"2024-07-10","source":"bioRxiv","url":"https://doi.org/10.1101/2024.07.06.602343","citation_count":0,"is_preprint":true},{"pmid":null,"id":"bio_10.1101_2025.04.13.648593","title":"Developmental, neuroanatomical and cellular expression of genes causing dystonia","date":"2025-04-18","source":"bioRxiv","url":"https://doi.org/10.1101/2025.04.13.648593","citation_count":0,"is_preprint":true}],"cost":{"stage1":{"model":"claude-sonnet-4-6","input_tokens":20774,"output_tokens":3950,"usd":0.060786,"stage1_stop_reason":"end_turn"},"stage2":{"model":"claude-opus-4-8","input_tokens":11788,"output_tokens":3797,"usd":0.076933,"stage2_stop_reason":"end_turn"},"total_usd":0.137719,"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\": 2017,\n      \"finding\": \"DNAJC12 physically interacts with phenylalanine hydroxylase (PAH), tyrosine hydroxylase (TH), and tryptophan hydroxylase, and its loss leads to reduced PAH enzyme activity and protein levels, establishing DNAJC12 as a co-chaperone required for stability and function of aromatic amino acid hydroxylases.\",\n      \"method\": \"Whole-exome sequencing identifying biallelic mutations; PAH enzyme activity assays; Western blot showing undetectable DNAJC12 protein in patient fibroblasts\",\n      \"journal\": \"American journal of human genetics\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — multiple orthogonal methods (WES, enzyme activity assay, Western blot), replicated across six patients in four families, and subsequently replicated by multiple independent labs\",\n      \"pmids\": [\"28132689\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2014,\n      \"finding\": \"DNAJC12 binds Hsc70 (HSPA8) in unstressed cells and BiP (GRP78/HSPA5) in ER-stressed cells, as determined by immunoaffinity-mass spectrometry and confirmed by co-immunoprecipitation of endogenous proteins; DNAJC12 protein is diffusely distributed in the cytoplasm.\",\n      \"method\": \"Immunoaffinity pull-down followed by mass spectrometry; co-immunoprecipitation of endogenous proteins; immunofluorescence microscopy\",\n      \"journal\": \"Cell stress & chaperones\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — reciprocal endogenous Co-IP confirmed MS result, single lab, two orthogonal methods\",\n      \"pmids\": [\"24122553\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2019,\n      \"finding\": \"DNAJC12 interacts with monoubiquitinated PAH in mouse liver lysates; mutant PAH shows increased ubiquitination, instability, and aggregation compared to normal PAH; DNAJC12 is implicated in processing misfolded ubiquitinated PAH via ubiquitin-dependent proteasome/autophagy systems.\",\n      \"method\": \"Co-immunoprecipitation from mouse liver lysates; Western blot for ubiquitination; Enu1/1 mouse model with V106A-Pah variant\",\n      \"journal\": \"Human mutation\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — Co-IP in vivo with mouse model, single lab, two orthogonal approaches (Co-IP + ubiquitination assay)\",\n      \"pmids\": [\"30667134\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2020,\n      \"finding\": \"DNAJC12 overexpression stabilizes destabilizing PAH mutations in a mutation-specific manner, and functional analysis showed DNAJC12 variants reduce PAH protein and activity and reduce tyrosine hydroxylase stability, but do not affect tryptophan hydroxylase 2 stability.\",\n      \"method\": \"Functional overexpression assays in cell lines; PAH activity assays; Western blot for protein stability; analysis of cohort with biallelic DNAJC12 variants\",\n      \"journal\": \"Human mutation\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — cell-based functional assays with enzyme activity measurements, single lab, multiple PAH variants tested\",\n      \"pmids\": [\"32333439\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2024,\n      \"finding\": \"DNAJC12 binds and stabilizes both TPH1 and TPH2 in transfected cells; Dnajc12 knockout mice show reduced PAH, TPH2, and TPH1 levels and activity in liver, brain, and pineal gland respectively, with resulting hyperphenylalaninemia and central and peripheral serotonin deficiency.\",\n      \"method\": \"Co-transfection/co-immunoprecipitation in cells; Dnajc12 knockout mouse model; enzyme activity assays; HPLC for neurotransmitter levels\",\n      \"journal\": \"Communications biology\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — in vivo knockout mouse model with multiple biochemical readouts plus cell-based binding assays, confirmed across multiple AAAH family members\",\n      \"pmids\": [\"39695187\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2025,\n      \"finding\": \"Cryo-electron microscopy and crosslinking-mass spectrometry reveal two DNAJC12 monomers bind per TH tetramer, each embracing one of the two regulatory domain dimers while leaving active sites accessible; DNAJC12 binding stabilizes TH and variant TH-p.R202H, delays their aggregation in an Hsp70-independent manner, preserves TH activity and dopamine feedback inhibition, and synergistically stimulates Hsc70 ATPase activity when complexed with TH; the C-terminal region of DNAJC12 is required for TH binding, explaining pathogenicity of p.W175Ter.\",\n      \"method\": \"Cryo-electron microscopy; crosslinking-mass spectrometry; in vitro aggregation assays; TH enzyme activity assays; Hsc70 ATPase assay; site-directed mutagenesis of DNAJC12 C-terminus\",\n      \"journal\": \"Nature communications\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 / Strong — cryo-EM structure with crosslinking-MS validation, multiple orthogonal functional assays (aggregation, activity, ATPase), mutagenesis confirming pathogenic mechanism, single rigorous study\",\n      \"pmids\": [\"40113792\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2025,\n      \"finding\": \"DNAJC12 forms a complex with GCH1 (guanine triphosphate cyclohydrolase 1, the rate-limiting enzyme in BH4 synthesis) in addition to TH and TPH; siRNA knockdown of DNAJC12 destabilizes the DNAJC12-TH-GCH1 complex and reduces GCH1 levels; reciprocal co-overexpression of TH and GCH1 increases endogenous DNAJC12; Dnajc12 knockout mice show reduced striatal DA and 5-HT, decreased electrically evoked DA release, and enhanced phosphorylation of TH at Ser31 and Ser40.\",\n      \"method\": \"Co-immunoprecipitation (overexpression); siRNA knockdown; Dnajc12 conditional/constitutive knockout mouse; ex vivo fast-scan cyclic voltammetry; Western blot for TH phosphorylation\",\n      \"journal\": \"NPJ Parkinson's disease\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — Co-IP, siRNA knockdown, and in vivo KO mouse with multiple biochemical readouts, single lab, several orthogonal methods\",\n      \"pmids\": [\"40447642\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2025,\n      \"finding\": \"DNAJC12 preferentially binds the L-Phe-activated conformation of PAH (resembling unliganded TH); at saturation, four DNAJC12 monomers bind and stabilize the PAH tetramer, protecting it from aggregation, lowering the L-Phe concentration required for substrate-induced activation without affecting BH4 interaction; DNAJC12 also stabilizes PKU-associated PAH-p.R261Q; L-Phe-activated PAH (wild-type or variant) is required to stimulate Hsc70 ATPase activity.\",\n      \"method\": \"In vitro binding assays with affinity measurements; aggregation assays; PAH enzyme activity assays; Hsc70 ATPase assay; structural analysis\",\n      \"journal\": \"bioRxiv\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 1 / Weak — multiple in vitro reconstitution assays with functional readouts, preprint (not yet peer-reviewed), single lab\",\n      \"pmids\": [\"bio_10.1101_2025.07.18.665471\"],\n      \"is_preprint\": true\n    },\n    {\n      \"year\": 2024,\n      \"finding\": \"DNAJC12 increases AKT phosphorylation in an HSP70-dependent manner in breast cancer cells; DNAJC12 forms a complex with HSP70 and AKT (co-immunoprecipitation); DNAJC12 overexpression activates the PI3K-AKT pathway, suppressing doxorubicin-induced ferroptosis and apoptosis; inhibiting HSP70 reverses DNAJC12-mediated doxorubicin resistance.\",\n      \"method\": \"Co-immunoprecipitation (DNAJC12, HSP70, AKT); RNA-seq pathway analysis; gain/loss-of-function in MDA-MB-231 and MCF-7 cells; AKT inhibitor rescue experiments; xenograft CDX model\",\n      \"journal\": \"Redox biology\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — reciprocal Co-IP, RNA-seq, in vivo CDX model, multiple rescue experiments, single lab\",\n      \"pmids\": [\"38306757\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2021,\n      \"finding\": \"Knockdown of DNAJC12 in lung cancer cells suppresses phosphorylation of p65 NF-κB, downregulates β-catenin expression and activation, and reduces vimentin; overexpression of β-catenin (but not NF-κB or vimentin) rescues the proliferation and invasion defects caused by DNAJC12 knockdown, placing DNAJC12 upstream of β-catenin in lung cancer cells.\",\n      \"method\": \"Lentiviral shRNA knockdown; β-catenin rescue overexpression; Western blot for pathway components; proliferation/invasion assays; in vivo xenograft\",\n      \"journal\": \"International journal of molecular medicine\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — genetic epistasis via rescue experiment, in vivo validation, single lab, multiple orthogonal readouts\",\n      \"pmids\": [\"33907820\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2022,\n      \"finding\": \"HNF1A binds the DNAJC12 promoter and transcriptionally activates DNAJC12 expression in NSCLC cells; DNAJC12-mediated promotion of aerobic glycolysis and cisplatin resistance is reversed by β-catenin silencing, and HNF1A's effects are abolished by DNAJC12 downregulation.\",\n      \"method\": \"Luciferase reporter assay for HNF1A-DNAJC12 promoter binding; siRNA knockdown; cell growth/apoptosis assays; in vivo tumor formation\",\n      \"journal\": \"Annals of translational medicine\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — luciferase reporter assay establishing direct promoter regulation, epistasis via rescue, single lab\",\n      \"pmids\": [\"35571408\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2030,\n      \"finding\": \"DNAJC12 knockdown in neuroblastoma cells activates glycolysis, increasing lactate production and histone H4 lysine 5 lactylation (H4K5la), which upregulates COL1A1 transcription and promotes cell invasion; inhibiting glycolysis, reducing H4K5la, or targeting COL1A1 mitigates invasive behavior.\",\n      \"method\": \"DNAJC12 knockdown; metabolic flux assays for glycolysis; chromatin immunoprecipitation for H4K5la at COL1A1 promoter; invasion assays; IHC of patient samples\",\n      \"journal\": \"Journal of molecular cell biology\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — mechanistic chain from DNAJC12 loss to glycolysis to histone modification to target gene, multiple rescue approaches, single lab\",\n      \"pmids\": [\"39716470\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2025,\n      \"finding\": \"DNAJC12 knockout mice show reduced PAH protein levels in liver (at post-transcriptional level, as aromatic amino acid hydroxylase mRNA levels are unchanged) with resulting hyperphenylalaninemia, impaired cognitive function in the Morris water maze, and decreased brain monoamine neurotransmitters; TH and TPH2 protein levels are unchanged in this model.\",\n      \"method\": \"CRISPR/Cas9 knockout mouse (exons 2–4 deleted); RT-qPCR for mRNA; Western blot for protein; Morris water maze cognitive testing; HPLC for amino acids and neurotransmitters\",\n      \"journal\": \"Orphanet journal of rare diseases\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — in vivo knockout model with multiple biochemical and behavioral readouts, single lab, distinguishes transcriptional vs post-transcriptional mechanism\",\n      \"pmids\": [\"39923104\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2022,\n      \"finding\": \"DNAJC12 physically associates with HSPA4 (a Hsp110 family member) in rectal cancer cells as shown by co-immunoprecipitation; HSPA4 overexpression rescues the effects of DNAJC12 silencing on proliferation, migration, and apoptosis.\",\n      \"method\": \"Co-immunoprecipitation; rescue overexpression of HSPA4; CCK-8, wound healing, flow cytometry; xenograft model — NOTE: this paper (PMID:36185081) was subsequently retracted (PMID:37565223)\",\n      \"journal\": \"Evidence-based complementary and alternative medicine\",\n      \"confidence\": \"Low\",\n      \"confidence_rationale\": \"Tier 3 / Weak — single Co-IP, single lab, and the paper was subsequently retracted\",\n      \"pmids\": [\"36185081\"],\n      \"is_preprint\": false\n    }\n  ],\n  \"current_model\": \"DNAJC12 is a cytoplasmic J-domain co-chaperone that directly binds and stabilizes all four aromatic amino acid hydroxylases (PAH, TH, TPH1, TPH2) as well as GCH1 (the rate-limiting BH4 synthesis enzyme); cryo-EM shows two DNAJC12 monomers embrace the regulatory domain dimer of the TH tetramer, and four DNAJC12 monomers stabilize PAH, with the C-terminal region of DNAJC12 being essential for substrate binding, while DNAJC12 synergistically activates Hsc70 ATPase activity only when complexed with its client substrate, thereby coupling client recognition to chaperone activation; loss of DNAJC12 destabilizes these hydroxylases post-transcriptionally, causing hyperphenylalaninemia and deficient dopamine/serotonin synthesis, explaining the clinical syndrome of hyperphenylalaninemia with neurotransmitter deficiency.\"\n}\n```","stage2_raw":"{\n  \"mechanistic_narrative\": \"DNAJC12 is a cytoplasmic J-domain co-chaperone that maintains the stability and catalytic competence of the aromatic amino acid hydroxylase family, coupling client recognition to Hsp70-cycle activation [#0, #5]. It directly binds phenylalanine hydroxylase (PAH), tyrosine hydroxylase (TH), and tryptophan hydroxylases (TPH1, TPH2), and its loss reduces hydroxylase protein levels and enzyme activity post-transcriptionally, since hydroxylase mRNA is unchanged in knockout animals [#0, #4, #12]. Structurally, the co-chaperone engages the regulatory regions of these enzymes without occluding their active sites: two DNAJC12 monomers embrace the regulatory-domain dimers of the TH tetramer, while four monomers bind the L-Phe-activated PAH tetramer, protecting both from aggregation and preserving activity and feedback regulation, with the C-terminal region required for client binding [#5]. DNAJC12 partners with the cytosolic Hsc70 (HSPA8) chaperone and stimulates its ATPase activity only when complexed with its client substrate, thereby coupling client engagement to chaperone activation [#1, #5]. Beyond client binding it also forms a complex with GCH1, the rate-limiting enzyme of BH4 cofactor synthesis, and its loss reduces GCH1 levels and dopaminergic and serotonergic neurotransmitter output [#6]. Loss-of-function mutations in DNAJC12 destabilize PAH and other hydroxylases, producing hyperphenylalaninemia with central and peripheral monoamine neurotransmitter deficiency [#0, #4]. In cancer cells DNAJC12 has been linked to HSP70-dependent AKT activation and to glycolytic and β-catenin signaling [#8, #9].\",\n  \"teleology\": [\n    {\n      \"year\": 2014,\n      \"claim\": \"Before its client repertoire was known, the question was which core chaperones DNAJC12 cooperates with and where it acts; this established it as a cytoplasmic J-protein cycling with Hsc70.\",\n      \"evidence\": \"Immunoaffinity-MS plus reciprocal endogenous Co-IP and immunofluorescence\",\n      \"pmids\": [\"24122553\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Did not identify hydroxylase clients\", \"Functional consequence of Hsc70/BiP binding unresolved\"]\n    },\n    {\n      \"year\": 2017,\n      \"claim\": \"The disease-relevant function was unknown until biallelic mutations linked DNAJC12 to hyperphenylalaninemia, establishing it as a co-chaperone required for stability and activity of aromatic amino acid hydroxylases.\",\n      \"evidence\": \"Whole-exome sequencing in patients, PAH activity assays, and Western blot in patient fibroblasts\",\n      \"pmids\": [\"28132689\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Molecular basis of stabilization not resolved\", \"No structural model of client binding\"]\n    },\n    {\n      \"year\": 2019,\n      \"claim\": \"It was unclear how DNAJC12 handles misfolded client; it was shown to interact with monoubiquitinated PAH and to be implicated in routing destabilized mutant PAH toward degradation.\",\n      \"evidence\": \"Co-IP from Enu1/1 mouse liver lysates and ubiquitination Western blots\",\n      \"pmids\": [\"30667134\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"E3 ligase not identified\", \"Proteasome vs autophagy partitioning unresolved\"]\n    },\n    {\n      \"year\": 2020,\n      \"claim\": \"To test whether stabilization is general or selective, overexpression assays showed DNAJC12 rescues destabilizing PAH variants in a mutation-specific manner and stabilizes TH but not TPH2 in this system.\",\n      \"evidence\": \"Cell-based overexpression with PAH activity assays and Western blots across multiple variants\",\n      \"pmids\": [\"32333439\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Basis of client selectivity unexplained\", \"Discrepancy with later TPH binding data unresolved\"]\n    },\n    {\n      \"year\": 2024,\n      \"claim\": \"Whether DNAJC12 governs serotonergic enzymes in vivo was open; binding to TPH1/TPH2 plus a knockout mouse showing reduced PAH, TPH1, and TPH2 established its role across the full hydroxylase family and tied loss to serotonin deficiency.\",\n      \"evidence\": \"Co-transfection Co-IP and Dnajc12 knockout mouse with enzyme activity and HPLC neurotransmitter measurements\",\n      \"pmids\": [\"39695187\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Tissue-specific contributions not dissected\", \"Structural mode of TPH binding not shown\"]\n    },\n    {\n      \"year\": 2025,\n      \"claim\": \"How DNAJC12 recognizes and protects clients at atomic resolution was unknown; cryo-EM and crosslinking-MS revealed stoichiometric binding to the TH regulatory domain that leaves active sites accessible and couples client complex formation to Hsc70 ATPase stimulation.\",\n      \"evidence\": \"Cryo-EM, crosslinking-MS, in vitro aggregation, TH activity, Hsc70 ATPase assays, and C-terminal mutagenesis\",\n      \"pmids\": [\"40113792\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"J-domain/Hsc70 contact geometry not visualized\", \"Handoff from holding to refolding not resolved\"]\n    },\n    {\n      \"year\": 2025,\n      \"claim\": \"Whether DNAJC12 extends beyond the hydroxylases to cofactor supply was open; it was shown to complex with GCH1 and to support striatal dopamine and serotonin output and TH phosphorylation state in vivo.\",\n      \"evidence\": \"Co-IP, siRNA knockdown, Dnajc12 knockout mouse, ex vivo fast-scan cyclic voltammetry, and TH phospho-Western blots\",\n      \"pmids\": [\"40447642\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Direct vs hydroxylase-bridged GCH1 binding unresolved\", \"Mechanism linking loss to altered TH phosphorylation unclear\"]\n    },\n    {\n      \"year\": 2025,\n      \"claim\": \"The conformational selectivity and stoichiometry of PAH recognition were unknown; in vitro reconstitution showed preference for L-Phe-activated PAH, four-monomer binding, protection from aggregation, and client-dependent Hsc70 ATPase stimulation.\",\n      \"evidence\": \"In vitro binding/affinity, aggregation, PAH activity, and Hsc70 ATPase assays (preprint)\",\n      \"pmids\": [\"bio_10.1101_2025.07.18.665471\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Preprint, not yet peer-reviewed\", \"No cryo-EM structure of the PAH complex\"]\n    },\n    {\n      \"year\": 2024,\n      \"claim\": \"A non-chaperone, oncogenic role was tested; DNAJC12 was shown to drive HSP70-dependent AKT phosphorylation and PI3K-AKT activation that suppresses doxorubicin-induced ferroptosis and apoptosis in breast cancer.\",\n      \"evidence\": \"Reciprocal Co-IP, RNA-seq, gain/loss-of-function in breast cancer lines, AKT inhibitor rescue, and xenograft model\",\n      \"pmids\": [\"38306757\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Whether AKT is a direct client unresolved\", \"Relationship to the hydroxylase-chaperone function unclear\"]\n    },\n    {\n      \"year\": 2022,\n      \"claim\": \"How DNAJC12 promotes tumor growth was probed in lung cancer, placing it upstream of β-catenin and showing HNF1A transcriptionally activates DNAJC12 to support glycolysis and chemoresistance.\",\n      \"evidence\": \"shRNA knockdown with β-catenin rescue, luciferase promoter reporter, and xenografts\",\n      \"pmids\": [\"33907820\", \"35571408\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Mechanistic link from DNAJC12 to β-catenin not defined\", \"Connection to chaperone activity untested\"]\n    },\n    {\n      \"year\": 2030,\n      \"claim\": \"A metabolic-epigenetic circuit was described in which DNAJC12 loss activates glycolysis, raising lactate-driven H4K5 lactylation that upregulates COL1A1 to promote invasion.\",\n      \"evidence\": \"Knockdown, metabolic flux, H4K5la ChIP at COL1A1, and invasion assays in neuroblastoma\",\n      \"pmids\": [\"39716470\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"How DNAJC12 restrains glycolysis molecularly unresolved\", \"Generalizability beyond neuroblastoma untested\"]\n    },\n    {\n      \"year\": null,\n      \"claim\": \"How DNAJC12's J-domain physically docks onto Hsc70 to drive substrate release/refolding, and how the same protein bridges chaperone function and oncogenic AKT/β-catenin signaling, remain unresolved.\",\n      \"evidence\": \"\",\n      \"pmids\": [],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"No structure of the DNAJC12-Hsc70 interaction\", \"Substrate handoff and refolding cycle not reconstituted\", \"Mechanistic basis of cancer signaling roles undefined\"]\n    }\n  ],\n  \"mechanism_profile\": {\n    \"molecular_activity\": [\n      {\"term_id\": \"GO:0140096\", \"supporting_discovery_ids\": [0, 5]},\n      {\"term_id\": \"GO:0044183\", \"supporting_discovery_ids\": [0, 5, 4]},\n      {\"term_id\": \"GO:0098772\", \"supporting_discovery_ids\": [5, 7]}\n    ],\n    \"localization\": [\n      {\"term_id\": \"GO:0005829\", \"supporting_discovery_ids\": [1]}\n    ],\n    \"pathway\": [\n      {\"term_id\": \"R-HSA-392499\", \"supporting_discovery_ids\": [0, 5]},\n      {\"term_id\": \"R-HSA-1430728\", \"supporting_discovery_ids\": [4, 6]}\n    ],\n    \"complexes\": [\n      \"DNAJC12-TH-GCH1 complex\",\n      \"DNAJC12-Hsc70 chaperone complex\"\n    ],\n    \"partners\": [\n      \"PAH\",\n      \"TH\",\n      \"TPH1\",\n      \"TPH2\",\n      \"GCH1\",\n      \"HSPA8\",\n      \"HSPA5\",\n      \"AKT\"\n    ],\n    \"other_free_text\": []\n  }\n}","audit_flag":null,"evaluation":{"pairwise":"tie","faith_supported":7,"faith_total":7,"faith_pct":100.0}}