{"gene":"HSD17B12","run_date":"2026-06-10T01:55:22","timeline":{"discoveries":[{"year":2016,"finding":"HSD17B12 haploinsufficiency in female mice results in subfertility with decreased intraovarian arachidonic acid (AA) and prostaglandin metabolites (6-keto PGF1α, PGD2, PGE2, PGF2α, TXB2), meiotic spindle formation defects in immature follicles, polyovular follicles, and oocytes trapped in the corpus luteum — establishing HSD17B12's enzymatic role in AA metabolism as essential for ovarian function.","method":"Haploinsufficient mouse model (HSD17B12+/-), lipid/steroid metabolite profiling by mass spectrometry, histological and transcriptomic analysis","journal":"Endocrinology","confidence":"High","confidence_rationale":"Tier 2 / Strong — clean haploinsufficient KO model with specific metabolic (AA/prostaglandin) and phenotypic readouts, supported by transcriptome and histology; multiple orthogonal methods in one study","pmids":["27490311"],"is_preprint":false},{"year":2020,"finding":"HSD17B12 knockdown impairs HCV replication and reduces virion production by altering very-long-chain fatty acid (VLCFA)-containing lipid species and drastically reducing lipid droplets required for virus assembly; oleic acid supplementation rescues viral RNA replication in HSD17B12-depleted cells, confirming VLCFA specificity. The small-molecule inhibitor INH-12 similarly reduces replication of HCV, dengue, and Zika virus.","method":"siRNA knockdown in hepatoma cells, lipidomic profiling, oleic acid rescue experiment, small-molecule inhibitor (INH-12) treatment, infectious particle assays","journal":"Scientific reports","confidence":"High","confidence_rationale":"Tier 2 / Moderate — multiple orthogonal methods (KD, lipidomics, chemical rescue, pharmacological inhibition) in a single lab establishing mechanistic pathway position","pmids":["32132633"],"is_preprint":false},{"year":2014,"finding":"KAR (HSD17B12 ortholog in mammals; the 3-ketoacyl-CoA reductase of the fatty acid elongation cycle) regulates ELOVL6 via two distinct modes: (1) a catalysis-independent mode in which physical interaction with KAR increases ELOVL6 activity ~3-fold (observed even without NADPH and with a catalytic KAR mutant), and (2) a catalysis-dependent mode in which conversion of 3-ketoacyl-CoA to 3-hydroxyacyl-CoA by KAR further enhances ELOVL6 activity, likely by facilitating product release from a KAR-ELOVL6 complex.","method":"In vitro FA elongation assays with membrane fractions, purified ELOVL6 activity assays with and without KAR, KAR catalytic mutant analysis, NADPH dependence experiments","journal":"PloS one","confidence":"High","confidence_rationale":"Tier 1 / Moderate — in vitro reconstitution with purified proteins, active-site mutant controls, and two distinct experimental conditions distinguishing catalysis-independent and catalysis-dependent modes; single lab","pmids":["25003994"],"is_preprint":false},{"year":2023,"finding":"HSD17B12 (expressed in human liver microsomes) is the primary enzyme responsible for the reductive metabolism of the NSAID prodrug nabumetone to 4-(6-methoxy-2-naphthyl)butan-2-ol (MNBO), accounting for ~100% of microsomal activity; recombinant HSD17B12 also catalyzes reduction of pentoxifylline and S-warfarin, showing preference for compounds with a methyl ketone group on an alkyl chain, demonstrating HSD17B12 as a drug-metabolizing reductase.","method":"Quantitative proteomics correlation across 24 HLM donor samples, recombinant HSD17B12 expressed in HEK293T cells (enzymatic assay), siRNA knockdown in HepG2/Huh7 cells, substrate specificity assays","journal":"Archives of biochemistry and biophysics","confidence":"High","confidence_rationale":"Tier 1 / Moderate — recombinant enzyme activity assay plus knockdown confirmation plus proteomics correlation; multiple orthogonal methods in single lab","pmids":["36724833"],"is_preprint":false},{"year":2018,"finding":"HSD17B12 is a direct target of miR-152 in bovine mammary epithelial cells (MECs); dual-luciferase reporter assay validated binding of miR-152 to the HSD17B12 3'UTR; overexpression of HSD17B12 inhibits triglyceride production and cell proliferation while promoting apoptosis in MECs, and shRNA knockdown of HSD17B12 reverses these effects.","method":"Dual-luciferase reporter assay, qPCR, Western blot, miR-152 overexpression/knockdown and HSD17B12 overexpression/shRNA in MECs","journal":"Scientific reports","confidence":"Medium","confidence_rationale":"Tier 3 / Moderate — validated miRNA-target binding with luciferase assay and functional rescue, but single lab with no reconstitution of enzymatic mechanism","pmids":["29323178"],"is_preprint":false},{"year":2011,"finding":"HSD17B12 knockdown-induced growth inhibition of a breast carcinoma cell line is reversed by arachidonic acid (AA) supplementation, while growth inhibition of SCCHN PCI-13 cells is reversed by both estradiol (E2) and AA, establishing HSD17B12 as functionally involved in both AA production and E2 synthesis in cancer cells.","method":"siRNA knockdown with metabolite rescue (AA and E2 supplementation) in breast carcinoma and SCCHN cell lines","journal":"Cancer immunology, immunotherapy : CII","confidence":"Medium","confidence_rationale":"Tier 2 / Weak — metabolite rescue after KD provides pathway placement, but single lab, single rescue method per cell line","pmids":["21409596"],"is_preprint":false},{"year":2024,"finding":"Hepatocyte-specific HSD17B12 knockout mice develop microvesicular steatosis with failure of lipid droplet (LD) expansion rather than macrovesicular steatosis; lipidomic profiling shows decreased phosphatidylcholine and phosphatidylethanolamine species containing C18/C20 fatty acids (including oleic acid) and upregulated Cidec expression, implicating HSD17B12 in providing lipids critical for LD fusion and growth rather than general fatty acid elongation.","method":"Hepatocyte-specific conditional KO mice (LiB12cKO), histology, lipidomics, gene expression analysis (Cidec, MUP), liver damage assessment","journal":"FASEB journal","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — clean conditional KO with lipidomic and histological phenotyping, two orthogonal methods; single lab","pmids":["39248019"],"is_preprint":false},{"year":2025,"finding":"NR1D1 (nuclear receptor REV-ERBα) directly suppresses HSD17B12 transcription in sheep granulosa cells, as demonstrated by CUT&Tag-qPCR and dual-luciferase assay; downregulation of HSD17B12 by NR1D1 contributes to ROS-induced apoptosis, and HSD17B12 knockdown partially recapitulates the effects of NR1D1 overexpression on granulosa cell functionality.","method":"CUT&Tag-qPCR, dual-luciferase reporter assay, NR1D1 overexpression/knockdown, HSD17B12 siRNA knockdown in sheep granulosa cells","journal":"International journal of biological macromolecules","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — direct transcription factor binding demonstrated by CUT&Tag and luciferase; epistasis via dual KD; single lab","pmids":["39986531"],"is_preprint":false},{"year":2025,"finding":"In Hsd17b3 KO male mice, mutation of mouse HSD17B12 at the amino acid responsible for androstenedione-to-testosterone conversion (substituted with the corresponding human residue that abolishes this activity) results in reduced testicular testosterone production and decreased seminal vesicle weight, demonstrating that mouse HSD17B12 contributes to testosterone biosynthesis in the absence of HSD17B3. Additionally, HSD17B7 mRNA and protein are markedly upregulated in Hsd17b3 KO testes, and mouse (but not human) HSD17B7 can produce testosterone in vitro.","method":"CRISPR/Cas9 knock-in of species-specific amino acid substitution in Hsd17b12 combined with Hsd17b3 KO mice, testosterone/seminal vesicle weight measurements, in vitro testosterone production assay for HSD17B7","journal":"Endocrinology","confidence":"High","confidence_rationale":"Tier 1 / Moderate — active-site substitution mutagenesis in vivo combined with KO model and in vitro enzymatic assay; multiple orthogonal methods, single lab","pmids":["40336300"],"is_preprint":false},{"year":2026,"finding":"HSD17B12 promotes lysosome-dependent degradation of PD-L1 via the VAC14 and ESCRT complexes in tumor cells; this function is independent of its 3-ketoacyl-CoA reductase enzymatic activity. HSD17B12-deficient cells accumulate PD-L1 in both tumor cells and exosomes, reducing T cell-mediated cytotoxicity. A designed peptide (HSD-CC1-NPGY) reduces PD-L1 expression and suppresses tumor growth in a mouse model.","method":"HSD17B12 knockout/knockdown cell lines, co-immunoprecipitation with VAC14 and ESCRT complex, flow cytometry for PD-L1, T cell cytotoxicity assays, catalytic mutant analysis, peptide treatment in mouse tumor model","journal":"PLoS biology","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — Co-IP identifying binding partners (VAC14/ESCRT), catalytic mutant demonstrating activity-independence, multiple cell-based and in vivo readouts; single lab","pmids":["41592073"],"is_preprint":false},{"year":2025,"finding":"HSD17B12 inhibits intramuscular fat (IMF) cell proliferation while promoting differentiation and lipid accumulation in bovine muscle cells, as demonstrated by functional cell-based assays integrated with proteomic and metabolomic profiling across cattle breeds.","method":"Integrated proteomics and metabolomics of Longissimus dorsi muscle, functional cell-based assays (proliferation/differentiation/lipid accumulation) with HSD17B12 manipulation","journal":"Food chemistry. Molecular sciences","confidence":"Low","confidence_rationale":"Tier 3 / Weak — single lab, cell-based assay with limited mechanistic detail in abstract; no reconstitution or structural data","pmids":["41322358"],"is_preprint":false},{"year":2026,"finding":"HSD17b12 is identified as the core gene mediating 17α,20β-dihydroxy-4-pregnen-3-one (DHP) synthesis in allotetraploid hybrid fish; functional validation in HEK293T cells confirmed HSD17b12's capacity to produce DHP, consistent with its expression pattern tracking serum DHP levels during oocyte maturation.","method":"Transcriptomic analysis of staged oocytes, HEK293T cell expression system with functional DHP production assay","journal":"The Journal of steroid biochemistry and molecular biology","confidence":"Medium","confidence_rationale":"Tier 1 / Weak — in vitro enzyme activity reconstitution in HEK293T cells, single lab, single method for functional validation","pmids":["42176960"],"is_preprint":false},{"year":2016,"finding":"The Drosophila HSD17B12 ortholog Spidey/Kar functions in larval oenocytes to suppress cell growth by inhibiting the PI3K signaling pathway upstream of Akt activity, and also promotes lipid droplet induction; this establishes a role for this enzyme family in coupling lipid metabolism to PI3K-dependent cell growth control.","method":"Drosophila genetic loss-of-function (Spidey/Kar mutants), PI3K/Akt pathway activity assays, lipid droplet quantification in larval oenocytes","journal":"PLoS genetics","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — clean Drosophila LOF with PI3K pathway epistasis and dual phenotypic readouts (growth and lipid droplets); ortholog of HSD17B12; single lab","pmids":["27500738"],"is_preprint":false},{"year":2020,"finding":"The rs10838164 T allele in HSD17B12 increases HSD17B12 expression by enhancing binding of transcription factor YY1 to the HSD17B12 promoter region containing this SNP, as demonstrated by chromatin immunoprecipitation (ChIP) and dual-luciferase reporter assay, establishing YY1 as a transcriptional regulator of HSD17B12.","method":"Chromatin immunoprecipitation (ChIP) assay, dual-luciferase reporter assay, eQTL analysis","journal":"Journal of cellular and molecular medicine","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — direct TF binding demonstrated by ChIP plus luciferase reporter; single lab, two orthogonal methods","pmids":["33118286"],"is_preprint":false},{"year":2025,"finding":"The rs2863002-C risk allele at the neuroblastoma predisposition locus chr11p11.2 reduces GATA3 binding affinity to the HSD17B12 regulatory region, thereby regulating HSD17B12 expression; CRISPR genome editing and Hi-C confirmed the regulatory architecture, and reduced HSD17B12 expression via this allele is associated with altered lipid metabolism in neuroblastoma cells.","method":"ChIP-qPCR for GATA3 binding, luciferase reporter assay, CRISPR genome editing, Hi-C chromosomal conformation capture, targeted lipidomics","journal":"Advanced science (Weinheim, Baden-Wurttemberg, Germany)","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — multiple orthogonal genomic methods (ChIP, Hi-C, CRISPR, luciferase) converging on regulatory mechanism; single lab","pmids":["40525640"],"is_preprint":false}],"current_model":"HSD17B12 is a multifunctional endoplasmic reticulum-resident 3-ketoacyl-CoA reductase (the second step of the fatty acid elongation cycle) that physically interacts with and allosterically activates the elongase ELOVL6 via both catalysis-independent and catalysis-dependent mechanisms; it is essential for very-long-chain fatty acid synthesis and arachidonic acid production (underpinning prostaglandin biosynthesis and ovarian/fertility function), catalyzes reductive metabolism of drugs such as nabumetone, contributes to testosterone biosynthesis (in mice), regulates lipid droplet expansion in the liver, suppresses PI3K-dependent cell growth in Drosophila oenocytes, and independently of its reductase activity promotes lysosome-dependent PD-L1 degradation via the VAC14/ESCRT pathway to potentiate anti-tumor immunity; its expression is transcriptionally regulated by NR1D1 and YY1, and post-transcriptionally by miR-152."},"narrative":{"mechanistic_narrative":"HSD17B12 is the 3-ketoacyl-CoA reductase that catalyzes the second step of the microsomal fatty acid elongation cycle, and it functions both as a catalytic reductase and as a non-catalytic regulator of lipid and protein homeostasis [PMID:25003994, PMID:39248019]. It physically associates with the elongase ELOVL6 and increases its activity through two mechanisms: a catalysis-independent mode in which the direct interaction stimulates ELOVL6 ~3-fold even with a catalytically dead enzyme and without NADPH, and a catalysis-dependent mode in which reduction of 3-ketoacyl-CoA to 3-hydroxyacyl-CoA further enhances elongation, likely by facilitating product release from the complex [PMID:25003994]. Through its control of very-long-chain fatty acid synthesis, HSD17B12 governs arachidonic acid and downstream prostaglandin production required for ovarian function, where haploinsufficiency in mice causes subfertility with meiotic spindle and follicular defects [PMID:27490311], and it supplies VLCFA-containing lipid species and oleic acid that support hepatic lipid droplet expansion and viral lipid droplet biogenesis exploited by HCV [PMID:32132633, PMID:39248019]. Beyond fatty acid metabolism, HSD17B12 acts as a broad-specificity drug-metabolizing reductase, accounting for essentially all microsomal reduction of the prodrug nabumetone and reducing pentoxifylline and S-warfarin [PMID:36724833], and it contributes to steroid metabolism including testosterone biosynthesis in mice [PMID:40336300]. Independent of its reductase activity, HSD17B12 binds the VAC14 and ESCRT machinery to drive lysosome-dependent degradation of PD-L1, thereby potentiating T cell-mediated anti-tumor immunity [PMID:41592073]. Its expression is directly controlled at the promoter by the transcription factors NR1D1, YY1, and GATA3 and post-transcriptionally by miR-152 [PMID:39986531, PMID:33118286, PMID:40525640, PMID:29323178].","teleology":[{"year":2011,"claim":"Established that HSD17B12 sits upstream of both arachidonic acid and estradiol production in cancer cells, placing it in lipid- and steroid-generating pathways relevant to tumor growth.","evidence":"siRNA knockdown with arachidonic acid and estradiol metabolite rescue in breast carcinoma and SCCHN cell lines","pmids":["21409596"],"confidence":"Medium","gaps":["No reconstitution of the enzymatic reaction generating either metabolite","Does not distinguish direct catalytic contribution from indirect pathway effects"]},{"year":2014,"claim":"Defined the molecular mechanism by which HSD17B12/KAR functions in fatty acid elongation, showing it both physically activates ELOVL6 and catalyzes the ketoreduction step.","evidence":"In vitro fatty acid elongation and purified ELOVL6 activity assays with KAR catalytic mutants and NADPH-dependence controls","pmids":["25003994"],"confidence":"High","gaps":["No structure of the KAR-ELOVL6 complex","Stoichiometry and membrane topology of the complex unresolved"]},{"year":2016,"claim":"Demonstrated in vivo that HSD17B12's enzymatic role in arachidonic acid/prostaglandin metabolism is essential for ovarian function and fertility.","evidence":"Haploinsufficient mouse model with mass spectrometry metabolite profiling, histology, and transcriptomics","pmids":["27490311"],"confidence":"High","gaps":["Does not establish the specific lipid substrate-product relationship in the ovary","Mechanism linking AA/prostaglandin loss to spindle and follicular defects unresolved"]},{"year":2016,"claim":"Connected the elongase enzyme family to growth control, showing the Drosophila ortholog couples lipid metabolism to PI3K-dependent cell growth.","evidence":"Drosophila Spidey/Kar loss-of-function with PI3K/Akt pathway epistasis and lipid droplet quantification in oenocytes","pmids":["27500738"],"confidence":"Medium","gaps":["Mechanistic link between lipid product and PI3K inhibition not defined","Conservation of the growth-suppressive role in mammals untested"]},{"year":2018,"claim":"Identified post-transcriptional control of HSD17B12 by miR-152 and a role in triglyceride synthesis and cell fate in mammary epithelium.","evidence":"Dual-luciferase 3'UTR reporter, qPCR, Western blot, and miR-152/HSD17B12 gain- and loss-of-function in bovine mammary epithelial cells","pmids":["29323178"],"confidence":"Medium","gaps":["Enzymatic mechanism behind triglyceride and apoptosis effects not reconstituted","Single species/cell type"]},{"year":2020,"claim":"Placed HSD17B12 as a VLCFA-supplying enzyme essential for lipid droplet biogenesis required by HCV, dengue, and Zika replication, and validated it as a pharmacological antiviral target.","evidence":"siRNA knockdown in hepatoma cells, lipidomics, oleic acid rescue, and INH-12 small-molecule inhibition with infectious particle assays","pmids":["32132633"],"confidence":"High","gaps":["Does not define which specific VLCFA species are rate-limiting for assembly","Host vs. viral specificity of INH-12 not fully resolved"]},{"year":2020,"claim":"Identified YY1 as a direct transcriptional activator of HSD17B12 acting through a regulatory SNP.","evidence":"ChIP, dual-luciferase reporter, and eQTL analysis at the rs10838164 locus","pmids":["33118286"],"confidence":"Medium","gaps":["Downstream physiological consequence of altered expression not defined","Single regulatory variant studied"]},{"year":2023,"claim":"Established HSD17B12 as a quantitatively dominant drug-metabolizing reductase in human liver microsomes with defined substrate preference.","evidence":"Quantitative proteomics correlation across 24 donor microsomes, recombinant enzyme activity assays, and siRNA knockdown with substrate specificity profiling","pmids":["36724833"],"confidence":"High","gaps":["No structural basis for the methyl-ketone substrate preference","In vivo pharmacokinetic relevance not quantified"]},{"year":2024,"claim":"Refined the in vivo lipid role, showing hepatic HSD17B12 specifically provides lipids needed for lipid droplet fusion and growth rather than bulk fatty acid elongation.","evidence":"Hepatocyte-specific conditional knockout mice with histology, lipidomics, and Cidec/MUP expression analysis","pmids":["39248019"],"confidence":"Medium","gaps":["Causal link between specific phospholipid species and LD fusion not directly tested","Mechanism of Cidec upregulation unresolved"]},{"year":2025,"claim":"Demonstrated NR1D1 as a direct transcriptional repressor of HSD17B12 contributing to ROS-induced granulosa cell apoptosis, linking HSD17B12 regulation to ovarian cell fate.","evidence":"CUT&Tag-qPCR, dual-luciferase reporter, and NR1D1/HSD17B12 epistatic knockdown in sheep granulosa cells","pmids":["39986531"],"confidence":"Medium","gaps":["Effector lipid/steroid downstream of HSD17B12 in granulosa cells not identified","Single species"]},{"year":2025,"claim":"Established a regulatory variant mechanism in which a neuroblastoma risk allele reduces GATA3 binding and HSD17B12 expression, tying the gene to a cancer predisposition locus and lipid metabolism.","evidence":"GATA3 ChIP-qPCR, luciferase, CRISPR editing, Hi-C, and targeted lipidomics in neuroblastoma cells","pmids":["40525640"],"confidence":"Medium","gaps":["Causal lipid pathway driving neuroblastoma phenotype not pinpointed","Functional contribution relative to other locus genes unresolved"]},{"year":2025,"claim":"Showed mouse HSD17B12 contributes to testosterone biosynthesis when HSD17B3 is absent, defined by an active-site residue, expanding its steroidogenic role.","evidence":"CRISPR/Cas9 knock-in of a species-specific amino acid substitution combined with Hsd17b3 KO mice and in vitro testosterone production assays","pmids":["40336300"],"confidence":"High","gaps":["Human HSD17B12 lacks this activity, limiting cross-species extrapolation","Physiological contribution when HSD17B3 is intact unclear"]},{"year":2026,"claim":"Uncovered a reductase-independent function in which HSD17B12 drives lysosomal degradation of PD-L1 to enhance anti-tumor immunity, decoupling an immune role from its catalytic activity.","evidence":"Knockout/knockdown cell lines, Co-IP with VAC14 and ESCRT, catalytic mutant analysis, PD-L1 flow cytometry, T cell cytotoxicity assays, and a peptide in a mouse tumor model","pmids":["41592073"],"confidence":"Medium","gaps":["Direct binding partner that recruits HSD17B12 to PD-L1 not defined","Reciprocal validation of VAC14/ESCRT interactions limited to single lab"]},{"year":null,"claim":"How HSD17B12's catalysis-dependent lipid functions are mechanistically separated from its reductase-independent roles in PD-L1 degradation and ELOVL6 activation, and the structural basis of these distinct activities, remains unresolved.","evidence":"","pmids":[],"confidence":"Medium","gaps":["No structure of HSD17B12 alone or in complex with ELOVL6 or VAC14/ESCRT","Determinants partitioning catalytic vs. scaffolding functions unknown","Relative contribution of fatty acid vs. steroid substrates in human tissues unquantified"]}],"mechanism_profile":{"molecular_activity":[{"term_id":"GO:0016491","term_label":"oxidoreductase activity","supporting_discovery_ids":[2,3,8]},{"term_id":"GO:0140096","term_label":"catalytic activity, acting on a protein","supporting_discovery_ids":[9]},{"term_id":"GO:0098772","term_label":"molecular function regulator activity","supporting_discovery_ids":[2]}],"localization":[{"term_id":"GO:0005783","term_label":"endoplasmic reticulum","supporting_discovery_ids":[3]}],"pathway":[{"term_id":"R-HSA-1430728","term_label":"Metabolism","supporting_discovery_ids":[0,2,6]},{"term_id":"R-HSA-9748784","term_label":"Drug ADME","supporting_discovery_ids":[3]},{"term_id":"R-HSA-168256","term_label":"Immune System","supporting_discovery_ids":[9]}],"complexes":[],"partners":["ELOVL6","VAC14"],"other_free_text":[]}},"prefetch_data":{"uniprot":{"accession":"Q53GQ0","full_name":"Very-long-chain 3-oxoacyl-CoA reductase","aliases":["17-beta-hydroxysteroid dehydrogenase 12","17-beta-HSD 12","3-ketoacyl-CoA reductase","KAR","Estradiol 17-beta-dehydrogenase 12","Short chain dehydrogenase/reductase family 12C member 1"],"length_aa":312,"mass_kda":34.3,"function":"Catalyzes the second of the four reactions of the long-chain fatty acids elongation cycle. This endoplasmic reticulum-bound enzymatic process, allows the addition of two carbons to the chain of long- and very long-chain fatty acids/VLCFAs per cycle. This enzyme has a 3-ketoacyl-CoA reductase activity, reducing 3-ketoacyl-CoA to 3-hydroxyacyl-CoA, within each cycle of fatty acid elongation. Thereby, it may participate in the production of VLCFAs of different chain lengths that are involved in multiple biological processes as precursors of membrane lipids and lipid mediators. May also catalyze the transformation of estrone (E1) into estradiol (E2) and play a role in estrogen formation","subcellular_location":"Endoplasmic reticulum membrane","url":"https://www.uniprot.org/uniprotkb/Q53GQ0/entry"},"depmap":{"release":"DepMap","has_data":true,"is_common_essential":true,"resolved_as":"","url":"https://depmap.org/portal/gene/HSD17B12","classification":"Common Essential","n_dependent_lines":628,"n_total_lines":1208,"dependency_fraction":0.5198675496688742},"opencell":{"profiled":false,"resolved_as":"","ensg_id":"","cell_line_id":"","localizations":[],"interactors":[{"gene":"COPA","stoichiometry":0.2},{"gene":"COPB2","stoichiometry":0.2},{"gene":"COPE","stoichiometry":0.2},{"gene":"NSDHL","stoichiometry":0.2},{"gene":"RTN4","stoichiometry":0.2},{"gene":"SAR1B","stoichiometry":0.2},{"gene":"VAPA","stoichiometry":0.2},{"gene":"YIPF5","stoichiometry":0.2}],"url":"https://opencell.sf.czbiohub.org/search/HSD17B12","total_profiled":1310},"omim":[{"mim_id":"619067","title":"HYDROXYSTEROID DEHYDROGENASE-LIKE PROTEIN 1; HSDL1","url":"https://www.omim.org/entry/619067"},{"mim_id":"609574","title":"17-@BETA-HYDROXYSTEROID DEHYDROGENASE XII; HSD17B12","url":"https://www.omim.org/entry/609574"}],"hpa":{"profiled":true,"resolved_as":"","reliability":"","locations":[],"tissue_specificity":"Low tissue specificity","tissue_distribution":"Detected in all","driving_tissues":[],"url":"https://www.proteinatlas.org/search/HSD17B12"},"hgnc":{"alias_symbol":["KAR","SDR12C1"],"prev_symbol":[]},"alphafold":{"accession":"Q53GQ0","domains":[{"cath_id":"3.40.50.720","chopping":"49-312","consensus_level":"high","plddt":97.0556,"start":49,"end":312}],"viewer_url":"https://alphafold.ebi.ac.uk/entry/Q53GQ0","model_url":"https://alphafold.ebi.ac.uk/files/AF-Q53GQ0-F1-model_v6.cif","pae_url":"https://alphafold.ebi.ac.uk/files/AF-Q53GQ0-F1-predicted_aligned_error_v6.png","plddt_mean":94.38},"mouse_models":{"mgi_url":"https://www.informatics.jax.org/marker/summary?nomen=HSD17B12","jax_strain_url":"https://www.jax.org/strain/search?query=HSD17B12"},"sequence":{"accession":"Q53GQ0","fasta_url":"https://rest.uniprot.org/uniprotkb/Q53GQ0.fasta","uniprot_url":"https://www.uniprot.org/uniprotkb/Q53GQ0/entry","alphafold_viewer_url":"https://alphafold.ebi.ac.uk/entry/Q53GQ0"}},"corpus_meta":[{"pmid":"27490311","id":"PMC_27490311","title":"The Hydroxysteroid (17β) Dehydrogenase Family Gene HSD17B12 Is Involved in the Prostaglandin Synthesis Pathway, the Ovarian Function, and Regulation of Fertility.","date":"2016","source":"Endocrinology","url":"https://pubmed.ncbi.nlm.nih.gov/27490311","citation_count":51,"is_preprint":false},{"pmid":"28900399","id":"PMC_28900399","title":"Acacetin from Traditionally Used Saussurea involucrata Kar. et Kir. 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The small-molecule inhibitor INH-12 similarly reduces replication of HCV, dengue, and Zika virus.\",\n      \"method\": \"siRNA knockdown in hepatoma cells, lipidomic profiling, oleic acid rescue experiment, small-molecule inhibitor (INH-12) treatment, infectious particle assays\",\n      \"journal\": \"Scientific reports\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — multiple orthogonal methods (KD, lipidomics, chemical rescue, pharmacological inhibition) in a single lab establishing mechanistic pathway position\",\n      \"pmids\": [\"32132633\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2014,\n      \"finding\": \"KAR (HSD17B12 ortholog in mammals; the 3-ketoacyl-CoA reductase of the fatty acid elongation cycle) regulates ELOVL6 via two distinct modes: (1) a catalysis-independent mode in which physical interaction with KAR increases ELOVL6 activity ~3-fold (observed even without NADPH and with a catalytic KAR mutant), and (2) a catalysis-dependent mode in which conversion of 3-ketoacyl-CoA to 3-hydroxyacyl-CoA by KAR further enhances ELOVL6 activity, likely by facilitating product release from a KAR-ELOVL6 complex.\",\n      \"method\": \"In vitro FA elongation assays with membrane fractions, purified ELOVL6 activity assays with and without KAR, KAR catalytic mutant analysis, NADPH dependence experiments\",\n      \"journal\": \"PloS one\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 / Moderate — in vitro reconstitution with purified proteins, active-site mutant controls, and two distinct experimental conditions distinguishing catalysis-independent and catalysis-dependent modes; single lab\",\n      \"pmids\": [\"25003994\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2023,\n      \"finding\": \"HSD17B12 (expressed in human liver microsomes) is the primary enzyme responsible for the reductive metabolism of the NSAID prodrug nabumetone to 4-(6-methoxy-2-naphthyl)butan-2-ol (MNBO), accounting for ~100% of microsomal activity; recombinant HSD17B12 also catalyzes reduction of pentoxifylline and S-warfarin, showing preference for compounds with a methyl ketone group on an alkyl chain, demonstrating HSD17B12 as a drug-metabolizing reductase.\",\n      \"method\": \"Quantitative proteomics correlation across 24 HLM donor samples, recombinant HSD17B12 expressed in HEK293T cells (enzymatic assay), siRNA knockdown in HepG2/Huh7 cells, substrate specificity assays\",\n      \"journal\": \"Archives of biochemistry and biophysics\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 / Moderate — recombinant enzyme activity assay plus knockdown confirmation plus proteomics correlation; multiple orthogonal methods in single lab\",\n      \"pmids\": [\"36724833\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2018,\n      \"finding\": \"HSD17B12 is a direct target of miR-152 in bovine mammary epithelial cells (MECs); dual-luciferase reporter assay validated binding of miR-152 to the HSD17B12 3'UTR; overexpression of HSD17B12 inhibits triglyceride production and cell proliferation while promoting apoptosis in MECs, and shRNA knockdown of HSD17B12 reverses these effects.\",\n      \"method\": \"Dual-luciferase reporter assay, qPCR, Western blot, miR-152 overexpression/knockdown and HSD17B12 overexpression/shRNA in MECs\",\n      \"journal\": \"Scientific reports\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 3 / Moderate — validated miRNA-target binding with luciferase assay and functional rescue, but single lab with no reconstitution of enzymatic mechanism\",\n      \"pmids\": [\"29323178\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2011,\n      \"finding\": \"HSD17B12 knockdown-induced growth inhibition of a breast carcinoma cell line is reversed by arachidonic acid (AA) supplementation, while growth inhibition of SCCHN PCI-13 cells is reversed by both estradiol (E2) and AA, establishing HSD17B12 as functionally involved in both AA production and E2 synthesis in cancer cells.\",\n      \"method\": \"siRNA knockdown with metabolite rescue (AA and E2 supplementation) in breast carcinoma and SCCHN cell lines\",\n      \"journal\": \"Cancer immunology, immunotherapy : CII\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Weak — metabolite rescue after KD provides pathway placement, but single lab, single rescue method per cell line\",\n      \"pmids\": [\"21409596\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2024,\n      \"finding\": \"Hepatocyte-specific HSD17B12 knockout mice develop microvesicular steatosis with failure of lipid droplet (LD) expansion rather than macrovesicular steatosis; lipidomic profiling shows decreased phosphatidylcholine and phosphatidylethanolamine species containing C18/C20 fatty acids (including oleic acid) and upregulated Cidec expression, implicating HSD17B12 in providing lipids critical for LD fusion and growth rather than general fatty acid elongation.\",\n      \"method\": \"Hepatocyte-specific conditional KO mice (LiB12cKO), histology, lipidomics, gene expression analysis (Cidec, MUP), liver damage assessment\",\n      \"journal\": \"FASEB journal\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — clean conditional KO with lipidomic and histological phenotyping, two orthogonal methods; single lab\",\n      \"pmids\": [\"39248019\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2025,\n      \"finding\": \"NR1D1 (nuclear receptor REV-ERBα) directly suppresses HSD17B12 transcription in sheep granulosa cells, as demonstrated by CUT&Tag-qPCR and dual-luciferase assay; downregulation of HSD17B12 by NR1D1 contributes to ROS-induced apoptosis, and HSD17B12 knockdown partially recapitulates the effects of NR1D1 overexpression on granulosa cell functionality.\",\n      \"method\": \"CUT&Tag-qPCR, dual-luciferase reporter assay, NR1D1 overexpression/knockdown, HSD17B12 siRNA knockdown in sheep granulosa cells\",\n      \"journal\": \"International journal of biological macromolecules\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — direct transcription factor binding demonstrated by CUT&Tag and luciferase; epistasis via dual KD; single lab\",\n      \"pmids\": [\"39986531\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2025,\n      \"finding\": \"In Hsd17b3 KO male mice, mutation of mouse HSD17B12 at the amino acid responsible for androstenedione-to-testosterone conversion (substituted with the corresponding human residue that abolishes this activity) results in reduced testicular testosterone production and decreased seminal vesicle weight, demonstrating that mouse HSD17B12 contributes to testosterone biosynthesis in the absence of HSD17B3. Additionally, HSD17B7 mRNA and protein are markedly upregulated in Hsd17b3 KO testes, and mouse (but not human) HSD17B7 can produce testosterone in vitro.\",\n      \"method\": \"CRISPR/Cas9 knock-in of species-specific amino acid substitution in Hsd17b12 combined with Hsd17b3 KO mice, testosterone/seminal vesicle weight measurements, in vitro testosterone production assay for HSD17B7\",\n      \"journal\": \"Endocrinology\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 / Moderate — active-site substitution mutagenesis in vivo combined with KO model and in vitro enzymatic assay; multiple orthogonal methods, single lab\",\n      \"pmids\": [\"40336300\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2026,\n      \"finding\": \"HSD17B12 promotes lysosome-dependent degradation of PD-L1 via the VAC14 and ESCRT complexes in tumor cells; this function is independent of its 3-ketoacyl-CoA reductase enzymatic activity. HSD17B12-deficient cells accumulate PD-L1 in both tumor cells and exosomes, reducing T cell-mediated cytotoxicity. A designed peptide (HSD-CC1-NPGY) reduces PD-L1 expression and suppresses tumor growth in a mouse model.\",\n      \"method\": \"HSD17B12 knockout/knockdown cell lines, co-immunoprecipitation with VAC14 and ESCRT complex, flow cytometry for PD-L1, T cell cytotoxicity assays, catalytic mutant analysis, peptide treatment in mouse tumor model\",\n      \"journal\": \"PLoS biology\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — Co-IP identifying binding partners (VAC14/ESCRT), catalytic mutant demonstrating activity-independence, multiple cell-based and in vivo readouts; single lab\",\n      \"pmids\": [\"41592073\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2025,\n      \"finding\": \"HSD17B12 inhibits intramuscular fat (IMF) cell proliferation while promoting differentiation and lipid accumulation in bovine muscle cells, as demonstrated by functional cell-based assays integrated with proteomic and metabolomic profiling across cattle breeds.\",\n      \"method\": \"Integrated proteomics and metabolomics of Longissimus dorsi muscle, functional cell-based assays (proliferation/differentiation/lipid accumulation) with HSD17B12 manipulation\",\n      \"journal\": \"Food chemistry. Molecular sciences\",\n      \"confidence\": \"Low\",\n      \"confidence_rationale\": \"Tier 3 / Weak — single lab, cell-based assay with limited mechanistic detail in abstract; no reconstitution or structural data\",\n      \"pmids\": [\"41322358\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2026,\n      \"finding\": \"HSD17b12 is identified as the core gene mediating 17α,20β-dihydroxy-4-pregnen-3-one (DHP) synthesis in allotetraploid hybrid fish; functional validation in HEK293T cells confirmed HSD17b12's capacity to produce DHP, consistent with its expression pattern tracking serum DHP levels during oocyte maturation.\",\n      \"method\": \"Transcriptomic analysis of staged oocytes, HEK293T cell expression system with functional DHP production assay\",\n      \"journal\": \"The Journal of steroid biochemistry and molecular biology\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 1 / Weak — in vitro enzyme activity reconstitution in HEK293T cells, single lab, single method for functional validation\",\n      \"pmids\": [\"42176960\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2016,\n      \"finding\": \"The Drosophila HSD17B12 ortholog Spidey/Kar functions in larval oenocytes to suppress cell growth by inhibiting the PI3K signaling pathway upstream of Akt activity, and also promotes lipid droplet induction; this establishes a role for this enzyme family in coupling lipid metabolism to PI3K-dependent cell growth control.\",\n      \"method\": \"Drosophila genetic loss-of-function (Spidey/Kar mutants), PI3K/Akt pathway activity assays, lipid droplet quantification in larval oenocytes\",\n      \"journal\": \"PLoS genetics\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — clean Drosophila LOF with PI3K pathway epistasis and dual phenotypic readouts (growth and lipid droplets); ortholog of HSD17B12; single lab\",\n      \"pmids\": [\"27500738\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2020,\n      \"finding\": \"The rs10838164 T allele in HSD17B12 increases HSD17B12 expression by enhancing binding of transcription factor YY1 to the HSD17B12 promoter region containing this SNP, as demonstrated by chromatin immunoprecipitation (ChIP) and dual-luciferase reporter assay, establishing YY1 as a transcriptional regulator of HSD17B12.\",\n      \"method\": \"Chromatin immunoprecipitation (ChIP) assay, dual-luciferase reporter assay, eQTL analysis\",\n      \"journal\": \"Journal of cellular and molecular medicine\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — direct TF binding demonstrated by ChIP plus luciferase reporter; single lab, two orthogonal methods\",\n      \"pmids\": [\"33118286\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2025,\n      \"finding\": \"The rs2863002-C risk allele at the neuroblastoma predisposition locus chr11p11.2 reduces GATA3 binding affinity to the HSD17B12 regulatory region, thereby regulating HSD17B12 expression; CRISPR genome editing and Hi-C confirmed the regulatory architecture, and reduced HSD17B12 expression via this allele is associated with altered lipid metabolism in neuroblastoma cells.\",\n      \"method\": \"ChIP-qPCR for GATA3 binding, luciferase reporter assay, CRISPR genome editing, Hi-C chromosomal conformation capture, targeted lipidomics\",\n      \"journal\": \"Advanced science (Weinheim, Baden-Wurttemberg, Germany)\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — multiple orthogonal genomic methods (ChIP, Hi-C, CRISPR, luciferase) converging on regulatory mechanism; single lab\",\n      \"pmids\": [\"40525640\"],\n      \"is_preprint\": false\n    }\n  ],\n  \"current_model\": \"HSD17B12 is a multifunctional endoplasmic reticulum-resident 3-ketoacyl-CoA reductase (the second step of the fatty acid elongation cycle) that physically interacts with and allosterically activates the elongase ELOVL6 via both catalysis-independent and catalysis-dependent mechanisms; it is essential for very-long-chain fatty acid synthesis and arachidonic acid production (underpinning prostaglandin biosynthesis and ovarian/fertility function), catalyzes reductive metabolism of drugs such as nabumetone, contributes to testosterone biosynthesis (in mice), regulates lipid droplet expansion in the liver, suppresses PI3K-dependent cell growth in Drosophila oenocytes, and independently of its reductase activity promotes lysosome-dependent PD-L1 degradation via the VAC14/ESCRT pathway to potentiate anti-tumor immunity; its expression is transcriptionally regulated by NR1D1 and YY1, and post-transcriptionally by miR-152.\"\n}\n```","stage2_raw":"```json\n{\n  \"mechanistic_narrative\": \"HSD17B12 is the 3-ketoacyl-CoA reductase that catalyzes the second step of the microsomal fatty acid elongation cycle, and it functions both as a catalytic reductase and as a non-catalytic regulator of lipid and protein homeostasis [#2, #6]. It physically associates with the elongase ELOVL6 and increases its activity through two mechanisms: a catalysis-independent mode in which the direct interaction stimulates ELOVL6 ~3-fold even with a catalytically dead enzyme and without NADPH, and a catalysis-dependent mode in which reduction of 3-ketoacyl-CoA to 3-hydroxyacyl-CoA further enhances elongation, likely by facilitating product release from the complex [#2]. Through its control of very-long-chain fatty acid synthesis, HSD17B12 governs arachidonic acid and downstream prostaglandin production required for ovarian function, where haploinsufficiency in mice causes subfertility with meiotic spindle and follicular defects [#0], and it supplies VLCFA-containing lipid species and oleic acid that support hepatic lipid droplet expansion and viral lipid droplet biogenesis exploited by HCV [#1, #6]. Beyond fatty acid metabolism, HSD17B12 acts as a broad-specificity drug-metabolizing reductase, accounting for essentially all microsomal reduction of the prodrug nabumetone and reducing pentoxifylline and S-warfarin [#3], and it contributes to steroid metabolism including testosterone biosynthesis in mice [#8]. Independent of its reductase activity, HSD17B12 binds the VAC14 and ESCRT machinery to drive lysosome-dependent degradation of PD-L1, thereby potentiating T cell-mediated anti-tumor immunity [#9]. Its expression is directly controlled at the promoter by the transcription factors NR1D1, YY1, and GATA3 and post-transcriptionally by miR-152 [#7, #13, #14, #4].\",\n  \"teleology\": [\n    {\n      \"year\": 2011,\n      \"claim\": \"Established that HSD17B12 sits upstream of both arachidonic acid and estradiol production in cancer cells, placing it in lipid- and steroid-generating pathways relevant to tumor growth.\",\n      \"evidence\": \"siRNA knockdown with arachidonic acid and estradiol metabolite rescue in breast carcinoma and SCCHN cell lines\",\n      \"pmids\": [\"21409596\"],\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"\",\n      \"gaps\": [\"No reconstitution of the enzymatic reaction generating either metabolite\", \"Does not distinguish direct catalytic contribution from indirect pathway effects\"]\n    },\n    {\n      \"year\": 2014,\n      \"claim\": \"Defined the molecular mechanism by which HSD17B12/KAR functions in fatty acid elongation, showing it both physically activates ELOVL6 and catalyzes the ketoreduction step.\",\n      \"evidence\": \"In vitro fatty acid elongation and purified ELOVL6 activity assays with KAR catalytic mutants and NADPH-dependence controls\",\n      \"pmids\": [\"25003994\"],\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"\",\n      \"gaps\": [\"No structure of the KAR-ELOVL6 complex\", \"Stoichiometry and membrane topology of the complex unresolved\"]\n    },\n    {\n      \"year\": 2016,\n      \"claim\": \"Demonstrated in vivo that HSD17B12's enzymatic role in arachidonic acid/prostaglandin metabolism is essential for ovarian function and fertility.\",\n      \"evidence\": \"Haploinsufficient mouse model with mass spectrometry metabolite profiling, histology, and transcriptomics\",\n      \"pmids\": [\"27490311\"],\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"\",\n      \"gaps\": [\"Does not establish the specific lipid substrate-product relationship in the ovary\", \"Mechanism linking AA/prostaglandin loss to spindle and follicular defects unresolved\"]\n    },\n    {\n      \"year\": 2016,\n      \"claim\": \"Connected the elongase enzyme family to growth control, showing the Drosophila ortholog couples lipid metabolism to PI3K-dependent cell growth.\",\n      \"evidence\": \"Drosophila Spidey/Kar loss-of-function with PI3K/Akt pathway epistasis and lipid droplet quantification in oenocytes\",\n      \"pmids\": [\"27500738\"],\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"\",\n      \"gaps\": [\"Mechanistic link between lipid product and PI3K inhibition not defined\", \"Conservation of the growth-suppressive role in mammals untested\"]\n    },\n    {\n      \"year\": 2018,\n      \"claim\": \"Identified post-transcriptional control of HSD17B12 by miR-152 and a role in triglyceride synthesis and cell fate in mammary epithelium.\",\n      \"evidence\": \"Dual-luciferase 3'UTR reporter, qPCR, Western blot, and miR-152/HSD17B12 gain- and loss-of-function in bovine mammary epithelial cells\",\n      \"pmids\": [\"29323178\"],\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"\",\n      \"gaps\": [\"Enzymatic mechanism behind triglyceride and apoptosis effects not reconstituted\", \"Single species/cell type\"]\n    },\n    {\n      \"year\": 2020,\n      \"claim\": \"Placed HSD17B12 as a VLCFA-supplying enzyme essential for lipid droplet biogenesis required by HCV, dengue, and Zika replication, and validated it as a pharmacological antiviral target.\",\n      \"evidence\": \"siRNA knockdown in hepatoma cells, lipidomics, oleic acid rescue, and INH-12 small-molecule inhibition with infectious particle assays\",\n      \"pmids\": [\"32132633\"],\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"\",\n      \"gaps\": [\"Does not define which specific VLCFA species are rate-limiting for assembly\", \"Host vs. viral specificity of INH-12 not fully resolved\"]\n    },\n    {\n      \"year\": 2020,\n      \"claim\": \"Identified YY1 as a direct transcriptional activator of HSD17B12 acting through a regulatory SNP.\",\n      \"evidence\": \"ChIP, dual-luciferase reporter, and eQTL analysis at the rs10838164 locus\",\n      \"pmids\": [\"33118286\"],\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"\",\n      \"gaps\": [\"Downstream physiological consequence of altered expression not defined\", \"Single regulatory variant studied\"]\n    },\n    {\n      \"year\": 2023,\n      \"claim\": \"Established HSD17B12 as a quantitatively dominant drug-metabolizing reductase in human liver microsomes with defined substrate preference.\",\n      \"evidence\": \"Quantitative proteomics correlation across 24 donor microsomes, recombinant enzyme activity assays, and siRNA knockdown with substrate specificity profiling\",\n      \"pmids\": [\"36724833\"],\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"\",\n      \"gaps\": [\"No structural basis for the methyl-ketone substrate preference\", \"In vivo pharmacokinetic relevance not quantified\"]\n    },\n    {\n      \"year\": 2024,\n      \"claim\": \"Refined the in vivo lipid role, showing hepatic HSD17B12 specifically provides lipids needed for lipid droplet fusion and growth rather than bulk fatty acid elongation.\",\n      \"evidence\": \"Hepatocyte-specific conditional knockout mice with histology, lipidomics, and Cidec/MUP expression analysis\",\n      \"pmids\": [\"39248019\"],\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"\",\n      \"gaps\": [\"Causal link between specific phospholipid species and LD fusion not directly tested\", \"Mechanism of Cidec upregulation unresolved\"]\n    },\n    {\n      \"year\": 2025,\n      \"claim\": \"Demonstrated NR1D1 as a direct transcriptional repressor of HSD17B12 contributing to ROS-induced granulosa cell apoptosis, linking HSD17B12 regulation to ovarian cell fate.\",\n      \"evidence\": \"CUT&Tag-qPCR, dual-luciferase reporter, and NR1D1/HSD17B12 epistatic knockdown in sheep granulosa cells\",\n      \"pmids\": [\"39986531\"],\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"\",\n      \"gaps\": [\"Effector lipid/steroid downstream of HSD17B12 in granulosa cells not identified\", \"Single species\"]\n    },\n    {\n      \"year\": 2025,\n      \"claim\": \"Established a regulatory variant mechanism in which a neuroblastoma risk allele reduces GATA3 binding and HSD17B12 expression, tying the gene to a cancer predisposition locus and lipid metabolism.\",\n      \"evidence\": \"GATA3 ChIP-qPCR, luciferase, CRISPR editing, Hi-C, and targeted lipidomics in neuroblastoma cells\",\n      \"pmids\": [\"40525640\"],\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"\",\n      \"gaps\": [\"Causal lipid pathway driving neuroblastoma phenotype not pinpointed\", \"Functional contribution relative to other locus genes unresolved\"]\n    },\n    {\n      \"year\": 2025,\n      \"claim\": \"Showed mouse HSD17B12 contributes to testosterone biosynthesis when HSD17B3 is absent, defined by an active-site residue, expanding its steroidogenic role.\",\n      \"evidence\": \"CRISPR/Cas9 knock-in of a species-specific amino acid substitution combined with Hsd17b3 KO mice and in vitro testosterone production assays\",\n      \"pmids\": [\"40336300\"],\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"\",\n      \"gaps\": [\"Human HSD17B12 lacks this activity, limiting cross-species extrapolation\", \"Physiological contribution when HSD17B3 is intact unclear\"]\n    },\n    {\n      \"year\": 2026,\n      \"claim\": \"Uncovered a reductase-independent function in which HSD17B12 drives lysosomal degradation of PD-L1 to enhance anti-tumor immunity, decoupling an immune role from its catalytic activity.\",\n      \"evidence\": \"Knockout/knockdown cell lines, Co-IP with VAC14 and ESCRT, catalytic mutant analysis, PD-L1 flow cytometry, T cell cytotoxicity assays, and a peptide in a mouse tumor model\",\n      \"pmids\": [\"41592073\"],\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"\",\n      \"gaps\": [\"Direct binding partner that recruits HSD17B12 to PD-L1 not defined\", \"Reciprocal validation of VAC14/ESCRT interactions limited to single lab\"]\n    },\n    {\n      \"year\": null,\n      \"claim\": \"How HSD17B12's catalysis-dependent lipid functions are mechanistically separated from its reductase-independent roles in PD-L1 degradation and ELOVL6 activation, and the structural basis of these distinct activities, remains unresolved.\",\n      \"evidence\": \"\",\n      \"pmids\": [],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"No structure of HSD17B12 alone or in complex with ELOVL6 or VAC14/ESCRT\", \"Determinants partitioning catalytic vs. scaffolding functions unknown\", \"Relative contribution of fatty acid vs. steroid substrates in human tissues unquantified\"]\n    }\n  ],\n  \"mechanism_profile\": {\n    \"molecular_activity\": [\n      {\"term_id\": \"GO:0016491\", \"supporting_discovery_ids\": [2, 3, 8]},\n      {\"term_id\": \"GO:0140096\", \"supporting_discovery_ids\": [9]},\n      {\"term_id\": \"GO:0098772\", \"supporting_discovery_ids\": [2]}\n    ],\n    \"localization\": [\n      {\"term_id\": \"GO:0005783\", \"supporting_discovery_ids\": [3]}\n    ],\n    \"pathway\": [\n      {\"term_id\": \"R-HSA-1430728\", \"supporting_discovery_ids\": [0, 2, 6]},\n      {\"term_id\": \"R-HSA-9748784\", \"supporting_discovery_ids\": [3]},\n      {\"term_id\": \"R-HSA-168256\", \"supporting_discovery_ids\": [9]}\n    ],\n    \"complexes\": [],\n    \"partners\": [\"ELOVL6\", \"VAC14\"],\n    \"other_free_text\": []\n  }\n}\n```","audit_flag":null,"evaluation":{"pairwise":"win","faith_supported":6,"faith_total":6,"faith_pct":100.0}}