{"gene":"NR5A2","run_date":"2026-04-29T11:37:57","timeline":{"discoveries":[{"year":2003,"finding":"Crystal structure of the LRH-1 ligand binding domain at 2.4 Å resolution reveals the receptor adopts an active conformation as a monomer with a large but empty hydrophobic pocket; constitutive activity is conferred by an extended helix 2 that provides an additional layer to the canonical LBD fold, and mutating the conserved arginine in helix 2 reduces LRH-1 activity and coregulator recruitment.","method":"X-ray crystallography and site-directed mutagenesis","journal":"Molecular cell","confidence":"High","confidence_rationale":"Tier 1 — crystal structure with mutagenesis validation in single rigorous study","pmids":["12820970"],"is_preprint":false},{"year":2015,"finding":"Crystal structure of human LRH-1 ligand binding domain bound by PIP3 shows that the phospholipid hormone binds LRH-1 with high affinity, stabilizing the receptor LBD; the hydrophobic PIP3 tails are buried inside the ligand binding pocket while the negatively charged head group is presented on the receptor surface, establishing signaling phosphatidylinositols as regulatory ligands for LRH-1.","method":"X-ray crystallography and in vitro binding assay","journal":"Journal of structural biology","confidence":"High","confidence_rationale":"Tier 1 — crystal structure with affinity measurement, reinforced by prior structural work on related receptor","pmids":["26416531"],"is_preprint":false},{"year":2024,"finding":"Cryo-EM structure of human NR5A2 bound to a nucleosome shows that the conserved C-terminal extension (CTE) loop of the NR5A2 DNA-binding domain competes with a DNA minor groove anchor of the nucleosome to release entry-exit site DNA; mutagenesis showed NR5A2 D159 of the CTE is dispensable for DNA binding but required for stable nucleosome association and persistent DNA unwrapping, defining a pioneer factor mechanism.","method":"Cryo-electron microscopy and mutational analysis","journal":"Nature structural & molecular biology","confidence":"High","confidence_rationale":"Tier 1 — cryo-EM structure plus mutagenesis with functional validation","pmids":["38409506"],"is_preprint":false},{"year":2005,"finding":"SUMOylation of LRH-1 causes its exclusive localization to promyelocytic leukemia protein (PML) nuclear bodies in a dynamic process demonstrated by FRET and FRAP; desumoylation releases LRH-1 from PML bodies allowing access to actively transcribed target genes, showing that SUMO-dependent compartmentalization prevents LRH-1 from accessing chromatin.","method":"FRET, FRAP, and fluorescence microscopy with SUMO mutant analysis","journal":"Molecular and cellular biology","confidence":"High","confidence_rationale":"Tier 2 — multiple orthogonal live-imaging methods with functional consequence demonstrated","pmids":["15923626"],"is_preprint":false},{"year":2006,"finding":"Phosphorylation of LRH-1 hinge domain serine residues S238 and S243 by mitogenic signaling through ERK1/2 stimulates transactivation; alanine substitution at both sites decreases PMA-dependent LRH-1 transactivation, while aspartate substitutions (phosphomimetic) increase basal transactivation.","method":"In vitro kinase assay, site-directed mutagenesis, and transcriptional reporter assay","journal":"The Journal of biological chemistry","confidence":"High","confidence_rationale":"Tier 1 — in vitro phosphorylation plus mutagenesis with functional readout","pmids":["16439367"],"is_preprint":false},{"year":2014,"finding":"SUMOylation of LRH-1 at K289 promotes interaction with the corepressor PROX1; mice carrying a SUMOylation-defective K289R mutation show decreased PROX1 interaction, increased reverse cholesterol transport gene expression, and develop less atherosclerosis on a high-cholesterol diet.","method":"Knock-in mouse model (K289R), co-immunoprecipitation, and metabolic phenotyping","journal":"Cell metabolism","confidence":"High","confidence_rationale":"Tier 2 — reciprocal interaction mapped to specific residue in vivo with disease phenotype","pmids":["25176150"],"is_preprint":false},{"year":2017,"finding":"SUMOylation-defective LRH-1 K289R mutation induces OSBPL3 expression, which enhances SREBP-1 processing and promotes de novo lipogenesis; silencing hepatic Osbpl3 reverses the lipogenic phenotype of LRH-1 K289R mice, establishing a LRH-1 SUMOylation → OSBPL3 → SREBP-1 pathway in NAFLD.","method":"Knock-in mouse model, adenoviral gene expression, siRNA knockdown, and lipid analysis","journal":"The Journal of clinical investigation","confidence":"High","confidence_rationale":"Tier 2 — epistasis established in vivo with orthogonal rescue experiment","pmids":["28094767"],"is_preprint":false},{"year":2010,"finding":"LRH-1 agonist-induced SUMOylation recruits LRH-1 to hepatic acute phase response (APR) promoters where it prevents clearance of the N-CoR corepressor complex upon cytokine stimulation; GPS2 functions as a transrepression mediator bridging SUMOylated LRH-1 to the N-CoR complex.","method":"ChIP, co-immunoprecipitation, SUMO-1 knockout mice, and promoter reporter assays","journal":"Genes & development","confidence":"High","confidence_rationale":"Tier 2 — multiple orthogonal methods plus in vivo knockout model","pmids":["20159957"],"is_preprint":false},{"year":2010,"finding":"The transcriptional corepressor SHP recruits SIRT1 histone deacetylase specifically to LRH-1 target gene promoters; SIRT1 deacetylates histones H3 and H4 at these promoters to repress LRH-1-dependent bile acid synthesis gene transcription (CYP7A1, SHP), in a manner dependent on SHP-SIRT1 interaction but not deacetylation of LRH-1 itself.","method":"Co-immunoprecipitation, ChIP, dominant-negative constructs, and reporter assays","journal":"Nucleic acids research","confidence":"High","confidence_rationale":"Tier 2 — reciprocal Co-IP plus ChIP with functional validation of mechanism","pmids":["20375098"],"is_preprint":false},{"year":2012,"finding":"HNF4α and LRH-1 cooperate in vivo to maintain basal Cyp7a1 expression and to enable SHP binding to the Cyp7a1 promoter, thereby facilitating FGF19-mediated repression of bile acid synthesis; HNF4α and LRH-1 promote active transcription histone marks on the Cyp7a1 promoter that are reversed by FGF19 in a SHP-dependent manner.","method":"Loss-of-function studies in mice, ChIP, and histone mark analysis","journal":"The Journal of biological chemistry","confidence":"High","confidence_rationale":"Tier 2 — genetic epistasis in vivo with ChIP mechanistic evidence","pmids":["23038264"],"is_preprint":false},{"year":2014,"finding":"LRH-1 initiates an ER stress resolution pathway independent of known UPR components by inducing expression of the kinase Plk3, which phosphorylates and activates the transcription factor ATF2; Plk3-null mice cannot resolve ER stress, and restoring Plk3 in Lrh-1-null cells rescues ER stress resolution.","method":"Hepatic Lrh-1 knockout mice, Plk3 knockout mice, rescue experiments, and in vitro stress assays","journal":"eLife","confidence":"High","confidence_rationale":"Tier 2 — genetic epistasis with complementation rescue across two knockout models","pmids":["24737860"],"is_preprint":false},{"year":2010,"finding":"Nr5a2 (LRH-1) can replace Oct4 in reprogramming mouse somatic cells to iPSCs; it functions in part by activating Nanog expression and shares common genomic targets with Sox2 and Klf4 as revealed by genome-wide location analysis. Sumoylation mutants of Nr5a2 with enhanced transcriptional activity further increase reprogramming efficiency.","method":"Retroviral reprogramming, genome-wide ChIP analysis, and luciferase reporter assays","journal":"Cell stem cell","confidence":"High","confidence_rationale":"Tier 2 — functional replacement assay plus genome-wide binding analysis, widely cited","pmids":["20096661"],"is_preprint":false},{"year":2022,"finding":"Nr5a2 is an essential pioneer factor for zygotic genome activation (ZGA) in mouse two-cell embryos; it binds its motif within SINE B1/Alu retrotransposable elements in cis-regulatory regions of ZGA genes, promotes chromatin accessibility during ZGA, and binds nucleosomal DNA in vitro. Chemical inhibition indicates 72% of ZGA genes are regulated by Nr5a2.","method":"De novo motif search, knockout/knockdown, ATAC-seq, in vitro nucleosome binding, and chemical inhibition","journal":"Science (New York, N.Y.)","confidence":"High","confidence_rationale":"Tier 1-2 — multiple orthogonal methods including in vitro nucleosomal binding and genetic loss-of-function","pmids":["36423263"],"is_preprint":false},{"year":2023,"finding":"NR5A2 bridges ZGA to the first lineage segregation in totipotent mouse embryos; it is not required for global chromatin opening at the 2-cell stage but is essential for opening 8-cell-specific binding sites near blastocyst/stem cell regulatory genes. NR5A2 directly regulates key pluripotency genes (Nanog, Pou5f1/Oct4) and trophectoderm genes (Tead4, Gata3) at the 8-cell stage.","method":"Nr5a2 knockout, genome-wide chromatin binding (ChIP/CUT&TAG), ATAC-seq, and transcriptome analysis","journal":"Cell research","confidence":"High","confidence_rationale":"Tier 2 — genome-wide binding plus genetic knockout with stage-specific mechanistic resolution","pmids":["37935903"],"is_preprint":false},{"year":2024,"finding":"NR5A2 acts as a bipotency activator in totipotent embryos, binding and activating both early trophectoderm (TE) and inner cell mass (ICM) lineage genes at the 8-cell stage; Nr5a2 deficiency causes downregulation of both ICM genes (Nanog) and TE genes in 8-cell embryos.","method":"Tfap2c and Nr5a2 knockout, ChIP-seq in embryos, and transcriptome analysis","journal":"Nature structural & molecular biology","confidence":"High","confidence_rationale":"Tier 2 — genome-wide binding and genetic loss-of-function in vivo with lineage-specific readout","pmids":["38243114"],"is_preprint":false},{"year":2004,"finding":"The homeodomain protein Prox1 functions as a co-repressor for LRH-1/NR5A2, representing a conserved functional interaction analogous to the Drosophila FTZ/FTZ-F1 cofactor relationship; this interaction is proposed to regulate cholesterol homeostasis in the enterohepatic system.","method":"Co-immunoprecipitation, reporter assays, and functional characterization","journal":"EMBO reports","confidence":"Medium","confidence_rationale":"Tier 3 — single lab pulldown/reporter, functional conservation argument","pmids":["15143342"],"is_preprint":false},{"year":2004,"finding":"LRH-1 binds a specific site at nucleotides 134-142 of the ABCG5/ABCG8 intergenic region, and this binding site is necessary for activity of both the ABCG5 and ABCG8 promoters; EMSA with HepG2 nuclear extracts confirmed LRH-1 binding, and overexpression increased promoter activity.","method":"EMSA, promoter mutagenesis, luciferase reporter assay","journal":"Journal of lipid research","confidence":"Medium","confidence_rationale":"Tier 2 — direct DNA binding demonstrated by EMSA with mutagenesis confirmation","pmids":["15121760"],"is_preprint":false},{"year":2006,"finding":"LRH-1 (NR5A2) promotes expression of steroidogenic enzymes and synthesis of corticosterone in murine intestinal epithelial cells; LRH-1 haplo-insufficiency strongly reduces intestinal expression of steroidogenic enzymes and glucocorticoid synthesis upon immunological stress in vivo.","method":"LRH-1 haploinsufficient mice, in vitro steroidogenesis assays","journal":"The Journal of experimental medicine","confidence":"High","confidence_rationale":"Tier 2 — genetic loss-of-function in vivo with specific biochemical phenotype","pmids":["16923850"],"is_preprint":false},{"year":2013,"finding":"Nr5a2 maintains acinar cell differentiation and is required for re-establishing acinar fate during regeneration; Nr5a2 deletion in the pancreas leads to acinar-to-ductal metaplasia, loss of regenerative capacity, and dramatically accelerates oncogenic Kras-driven preneoplastic lesion development.","method":"Conditional pancreatic Nr5a2 knockout mice, caerulein pancreatitis, and Kras-driven cancer model","journal":"Gut","confidence":"High","confidence_rationale":"Tier 2 — conditional KO with multiple disease phenotype readouts","pmids":["23645620"],"is_preprint":false},{"year":2018,"finding":"NR5A2 links differentiation and inflammation in the pancreas by undergoing a transcriptional switch that relocates binding from differentiation-specific to inflammatory genes, promoting AP-1-dependent transcription; pancreatic deletion of Jun rescues the pre-inflammatory phenotype and NR5A2 binding to inflammatory gene promoters.","method":"Global transcriptomics, ChIP-seq, and Jun conditional knockout epistasis","journal":"Nature","confidence":"High","confidence_rationale":"Tier 2 — genome-wide binding with genetic epistasis rescue experiment","pmids":["29443959"],"is_preprint":false},{"year":2014,"finding":"LRH-1 is required for luteinization in the female mouse ovary; Nr5a2 depletion from antral follicle granulosa cells permits formation of luteal-like structures but not functional corpora lutea, with reduced progesterone levels due in part to defects in cholesterol transport (down-regulation of Scarb1, Ldlr, and Star).","method":"Conditional granulosa-specific Nr5a2 knockout mice and steroidogenic pathway analysis","journal":"Endocrinology","confidence":"High","confidence_rationale":"Tier 2 — conditional KO with specific biochemical and reproductive phenotype","pmids":["24552399"],"is_preprint":false},{"year":2013,"finding":"LRH-1 directly binds to the kisspeptin (Kiss1) promoter and stimulates Kiss1 transcription; deletion of LRH-1 from kisspeptin neurons decreases Kiss1 expression in the arcuate nucleus, reduces FSH levels, dysregulates follicle maturation, and prolongs the estrous cycle, while LRH-1 overexpression increases Kiss1 expression and FSH.","method":"Conditional neuron-specific knockout, overexpression, ChIP, and reporter assays","journal":"Molecular endocrinology (Baltimore, Md.)","confidence":"High","confidence_rationale":"Tier 2 — direct promoter binding demonstrated plus in vivo gain/loss-of-function","pmids":["23504956"],"is_preprint":false},{"year":2014,"finding":"TNF suppresses intestinal glucocorticoid synthesis by activating c-Jun and NF-κB transcription factors, which both interact with NR5A2 and repress Cyp11a1 reporter activity; this repression is relieved by dominant-negative JNK1, IκB, or a JNK inhibitor.","method":"Reporter assay, co-immunoprecipitation, and mouse colitis model with pharmacological rescue","journal":"Science signaling","confidence":"High","confidence_rationale":"Tier 2 — direct protein-protein interaction demonstrated plus in vivo pharmacological rescue","pmids":["24570488"],"is_preprint":false},{"year":2015,"finding":"LRH-1 mediates IL-13-induced macrophage polarization through generation of 15-HETE PPARγ ligands; LRH-1 loss-of-function in macrophages impairs generation of 15-HETE due to compromised regulation of CYP1A1 and CYP1B1, thereby blocking IL-13-induced alternative activation and increasing susceptibility to Candida albicans infection.","method":"LRH-1-deficient macrophage mice, lipid metabolite analysis, in vivo infection model","journal":"Nature communications","confidence":"High","confidence_rationale":"Tier 2 — conditional macrophage KO with pathway-specific metabolite readout and in vivo phenotype","pmids":["25873311"],"is_preprint":false},{"year":2015,"finding":"X-ray crystallography and molecular modeling identify an allosteric network in LRH-1 that links phospholipid binding in the ligand binding pocket to an alternate activation function (AF) region encompassing the β-sheet-H6 region, which in turn communicates with the classical AF2 surface to dictate co-regulator selectivity.","method":"X-ray crystallography and molecular dynamics simulation","journal":"The Journal of biological chemistry","confidence":"Medium","confidence_rationale":"Tier 1 — structural plus computational, but coregulator selectivity not validated by mutagenesis in this study","pmids":["26553876"],"is_preprint":false},{"year":2016,"finding":"NR5A2 controls neural stem cell fate decisions by synchronizing cell-cycle exit with neurogenesis induction and astrogliogenesis inhibition through direct regulatory effects on the Ink4/Arf locus, Prox1, Notch1, and JAK/STAT signaling pathways.","method":"Overexpression and loss-of-function in primary neural stem cells and mouse embryos","journal":"Nature communications","confidence":"Medium","confidence_rationale":"Tier 2-3 — multiple targets identified but direct binding not established for all; single lab","pmids":["27447294"],"is_preprint":false},{"year":2006,"finding":"NR5A2-null embryos display impaired primitive streak formation; aggregation experiments with wild-type tetraploid cells show that NR5A2 mutant epiblast cells can undergo normal gastrulation, demonstrating that NR5A2 is required specifically in extraembryonic tissues for proper primitive streak morphogenesis.","method":"Knockout mouse model and tetraploid aggregation rescue experiment","journal":"Developmental dynamics","confidence":"High","confidence_rationale":"Tier 2 — epistasis via tetraploid complementation clearly placing gene requirement in extraembryonic tissue","pmids":["17075876"],"is_preprint":false},{"year":2011,"finding":"LRH-1 directly occupies aromatase promoter II (PII) in breast adipose stromal fibroblasts as shown by chromatin immunoprecipitation; shRNA knockdown of LRH-1 decreases both PII activity and total aromatase mRNA, demonstrating LRH-1 as a tissue-specific transcriptional driver of aromatase expression.","method":"Chromatin immunoprecipitation (ChIP) and shRNA knockdown","journal":"Steroids","confidence":"Medium","confidence_rationale":"Tier 2 — direct chromatin occupancy shown by ChIP with functional KD confirmation, single lab","pmids":["21392518"],"is_preprint":false},{"year":2018,"finding":"LRH-1 directly transactivates several key steroidogenic enzyme genes to promote de novo androgen biosynthesis in castration-resistant prostate cancer; pharmacological inhibition of LRH-1 attenuates LRH-1-mediated androgen elevation and reduces AR signaling in CRPC xenografts.","method":"Luciferase reporter assays, ChIP, xenograft models, and pharmacological inhibition","journal":"Cancer research","confidence":"Medium","confidence_rationale":"Tier 2 — direct promoter binding shown by ChIP with in vivo functional validation","pmids":["29438990"],"is_preprint":false},{"year":2021,"finding":"Combined loss of Esrrb and Nr5a2 collapses the pluripotency network in mouse ESCs; the two orphan nuclear receptors occupy a large common set of regulatory elements and control the binding of Oct4, Sox2, and Nanog to DNA.","method":"Double knockout ESCs, ChIP-seq, and transcriptome analysis","journal":"Development (Cambridge, England)","confidence":"High","confidence_rationale":"Tier 2 — genome-wide binding analysis plus genetic double-KO demonstrating epistasis over core pluripotency factors","pmids":["34397088"],"is_preprint":false},{"year":2019,"finding":"LRH-1 is expressed in T lymphocytes and is required for T cell maturation and function; T cell-specific deletion of LRH-1 causes loss of mature peripheral T cells, reduced CD4+ T cell proliferation, failure to mount immune responses, and CD8+ T cell failure to control viral infections.","method":"T cell-specific conditional knockout mice, in vitro and in vivo T cell functional assays","journal":"Science advances","confidence":"High","confidence_rationale":"Tier 2 — conditional KO with multiple defined cellular and in vivo immune phenotypes","pmids":["31328159"],"is_preprint":false},{"year":2017,"finding":"LRH-1/NR5A2 directly binds to binding sites in the FASLG promoter and drives FASLG promoter activity; mutations in LRH-1 binding sites reduce FASLG promoter activity, and pharmacological inhibition of LRH-1 decreases FasL expression and FasL-mediated T cell apoptosis and cytotoxicity.","method":"Luciferase reporter assay, promoter mutagenesis, pharmacological inhibition, and mouse hepatitis model","journal":"Cell death & disease","confidence":"Medium","confidence_rationale":"Tier 2 — direct binding site mutagenesis plus functional pharmacological validation in vivo","pmids":["28406481"],"is_preprint":false},{"year":2022,"finding":"LRH-1 regulates a PTGS2/COX2-PGE2-PTGER1 signaling axis in pancreatic islets; LRH-1 ablation in developing beta cells abolished BL001 agonist protection against apoptosis and blunted Ptgs2 induction, while PTGER1 antagonism negated LRH-1-mediated islet survival.","method":"Beta cell-specific conditional knockout, pharmacological agonist/antagonist, and islet survival assays","journal":"iScience","confidence":"Medium","confidence_rationale":"Tier 2 — conditional KO with pathway-level rescue/antagonist experiments, single lab","pmids":["35602948"],"is_preprint":false},{"year":2018,"finding":"LRH-1 is required for maintaining arachidonoyl (AA) phospholipid pools in the liver; hepatic LRH-1 knockout leads to large cytosolic lipid droplets, increased triglycerides, and reduced AA phospholipids due to repression of Elovl5 and Fads2 genes critical for AA biosynthesis.","method":"Acute hepatic knockout (AAV8-Cre), lipidomics, and genomic analysis","journal":"JCI insight","confidence":"High","confidence_rationale":"Tier 2 — clean KO with lipidomics and genomic evidence establishing mechanistic link","pmids":["29515023"],"is_preprint":false},{"year":2024,"finding":"Hepatic FXR-FGF4 paracrine signaling acts through an intracellular FGFR4-LRH-1 signaling node to downregulate Cyp7a1 and Cyp8b1; this liver-centric pathway serves as a first-line checkpoint for intrahepatic bile acid flux upstream of the peripheral FXR-FGF15/19 pathway.","method":"Genetic mouse models, pharmacological inhibition, and ChIP analysis","journal":"Cell metabolism","confidence":"Medium","confidence_rationale":"Tier 2 — defined signaling node with in vivo genetic evidence, single study","pmids":["39393353"],"is_preprint":false}],"current_model":"NR5A2/LRH-1 is a constitutively active orphan nuclear receptor (stabilized by a unique extended helix 2 in its LBD) that can bind phosphatidylinositol phospholipids (including PIP3) as regulatory ligands; its transcriptional activity is fine-tuned by ERK-dependent phosphorylation of hinge-domain serines, SUMOylation-dependent sequestration into PML nuclear bodies or recruitment of corepressors (PROX1, N-CoR/GPS2, SHP-SIRT1), and interaction with cofactors including HNF4α; it functions as a pioneer factor that uses its CTE loop to compete with nucleosome minor-groove anchors to open chromatin, driving ZGA in totipotent embryos, maintaining acinar and pluripotent cell identity, regulating bile acid/cholesterol/lipid/glucocorticoid synthesis across liver, intestine, and steroidogenic tissues, and controlling T cell maturation and immune responses."},"narrative":{"teleology":[{"year":2003,"claim":"How LRH-1 achieves constitutive transcriptional activity without a bound ligand was unknown; the crystal structure revealed an extended helix 2 that stabilizes an active LBD conformation with a large empty pocket, establishing the structural basis for ligand-independent activity.","evidence":"X-ray crystallography at 2.4 Å with site-directed mutagenesis of helix 2 arginine","pmids":["12820970"],"confidence":"High","gaps":["Identity of endogenous regulatory ligands not established","No structure of full-length receptor"]},{"year":2004,"claim":"Which corepressors restrain LRH-1 activity was unclear; identification of Prox1 as an LRH-1 co-repressor and demonstration that LRH-1 directly binds the ABCG5/ABCG8 intergenic region established its role in cholesterol efflux gene regulation.","evidence":"Co-immunoprecipitation, reporter assays (Prox1); EMSA and promoter mutagenesis (ABCG5/G8)","pmids":["15143342","15121760"],"confidence":"Medium","gaps":["Prox1–LRH-1 interaction mapped only by single-lab Co-IP and reporter","In vivo relevance of ABCG5/G8 regulation by LRH-1 not tested genetically"]},{"year":2005,"claim":"How post-translational modification controls LRH-1 subnuclear distribution was unknown; live-cell imaging showed SUMOylation dynamically sequesters LRH-1 into PML nuclear bodies, preventing chromatin access and target gene activation.","evidence":"FRET, FRAP, and fluorescence microscopy with SUMO-site mutants","pmids":["15923626"],"confidence":"High","gaps":["Which SUMO E3 ligase targets LRH-1 in vivo not identified","Quantitative impact on target gene panels not assessed genome-wide"]},{"year":2006,"claim":"Whether mitogenic signaling modulates LRH-1 was untested; ERK1/2-dependent phosphorylation of hinge serines S238/S243 was shown to stimulate transactivation, linking growth factor pathways to LRH-1 output. Simultaneously, LRH-1 was found to drive intestinal glucocorticoid synthesis and to be required in extraembryonic tissues for primitive streak formation.","evidence":"In vitro kinase assay and phosphomimetic mutagenesis (ERK); haploinsufficient mice and steroidogenesis assays (intestinal GC); knockout with tetraploid aggregation rescue (gastrulation)","pmids":["16439367","16923850","17075876"],"confidence":"High","gaps":["Upstream receptor-to-ERK pathway in physiological LRH-1 contexts not defined","Extraembryonic target genes mediating gastrulation rescue not identified"]},{"year":2010,"claim":"How SUMOylation mechanistically represses specific gene sets and whether LRH-1 has roles beyond metabolism were open questions; SUMOylation was shown to recruit LRH-1 and the N-CoR/GPS2 complex to acute-phase response promoters for transrepression, SHP–SIRT1 was found to deacetylate histones at bile acid synthesis genes, and LRH-1 was demonstrated to replace Oct4 in somatic cell reprogramming by activating Nanog.","evidence":"ChIP and Co-IP with SUMO-1 KO mice (transrepression); Co-IP and ChIP with dominant-negatives (SHP–SIRT1); retroviral reprogramming and genome-wide ChIP (iPSC)","pmids":["20159957","20375098","20096661"],"confidence":"High","gaps":["Transrepression mechanism at APR genes not shown to be genome-wide","Whether LRH-1 directly opens chromatin during reprogramming not tested"]},{"year":2012,"claim":"How LRH-1 and HNF4α coordinately regulate Cyp7a1 was unclear; cooperative binding was shown to maintain basal expression and enable SHP-mediated FGF19 repression through histone mark remodeling.","evidence":"Hepatocyte-specific loss-of-function in mice with ChIP and histone mark analysis","pmids":["23038264"],"confidence":"High","gaps":["Stoichiometric relationship and co-occupancy dynamics of LRH-1/HNF4α not resolved"]},{"year":2013,"claim":"Whether LRH-1 has tissue-maintenance roles beyond metabolism was uncertain; pancreatic Nr5a2 deletion caused acinar-to-ductal metaplasia and accelerated Kras-driven neoplasia, while neuron-specific deletion disrupted Kiss1-dependent reproductive axis control.","evidence":"Conditional pancreatic and kisspeptin-neuron knockout mice with disease and endocrine phenotyping","pmids":["23645620","23504956"],"confidence":"High","gaps":["Direct versus indirect target genes in acinar maintenance not fully delineated","Whether Kiss1 regulation is the sole mechanism for reproductive phenotype not established"]},{"year":2014,"claim":"The in vivo consequences of LRH-1 SUMOylation and its broader cytoprotective functions were undefined; K289R knock-in mice showed reduced PROX1 interaction and enhanced reverse cholesterol transport (reducing atherosclerosis), LRH-1 was found to resolve ER stress via a Plk3→ATF2 pathway, and ovarian Nr5a2 loss impaired luteinization and progesterone synthesis.","evidence":"K289R knock-in mice with metabolic phenotyping; hepatic and Plk3 double-KO with rescue; granulosa-specific KO with steroidogenic analysis","pmids":["25176150","24737860","24552399"],"confidence":"High","gaps":["Whether SUMO-PROX1 axis operates in tissues beyond liver not tested","Plk3–ATF2 pathway not confirmed outside hepatocytes"]},{"year":2015,"claim":"How phospholipid binding is transduced to coregulator selection and how LRH-1 participates in innate immunity were open; PIP3 was crystallized in the LBD pocket, an allosteric network linking the pocket to AF2 was mapped, and macrophage LRH-1 was shown to generate 15-HETE PPARγ ligands for alternative activation.","evidence":"X-ray crystallography and MD simulations (PIP3/allosteric); macrophage-specific KO with lipidomics and Candida infection model","pmids":["26416531","26553876","25873311"],"confidence":"High","gaps":["Allosteric coregulator selectivity not validated by mutagenesis","In vivo PIP3 occupancy of LRH-1 not demonstrated"]},{"year":2017,"claim":"Downstream metabolic consequences of LRH-1 de-SUMOylation and its role in FasL-mediated immunity were unclear; K289R mice developed NAFLD through an LRH-1→OSBPL3→SREBP-1 lipogenic pathway, and LRH-1 was shown to directly activate the FASLG promoter controlling T cell cytotoxicity.","evidence":"K289R knock-in with siRNA rescue (NAFLD); FASLG promoter mutagenesis and pharmacological inhibition in hepatitis model","pmids":["28094767","28406481"],"confidence":"High","gaps":["OSBPL3 regulation in human NAFLD not confirmed","FASLG regulation shown mainly in single lab"]},{"year":2018,"claim":"How NR5A2 loss triggers inflammation and what hepatic lipid species it controls were unresolved; ChIP-seq revealed NR5A2 undergoes a binding switch from differentiation to AP-1-dependent inflammatory genes (reversed by Jun deletion), and hepatic KO depleted arachidonoyl phospholipids via Elovl5/Fads2 repression.","evidence":"ChIP-seq with Jun conditional KO epistasis (pancreas); acute hepatic KO with lipidomics","pmids":["29438990","29443959","29515023"],"confidence":"High","gaps":["Whether the NR5A2-to-AP-1 switch occurs in human pancreatic disease not established","Prostate steroidogenic role based on xenograft, not genetic model"]},{"year":2019,"claim":"Whether LRH-1 functions in adaptive immunity was unknown; T cell-specific deletion revealed LRH-1 is essential for T cell maturation, proliferation, and antiviral responses.","evidence":"T cell-specific conditional knockout mice with in vivo viral challenge","pmids":["31328159"],"confidence":"High","gaps":["Direct transcriptional targets mediating T cell maturation not identified genome-wide","Mechanism of CD8+ T cell failure not molecularly defined"]},{"year":2021,"claim":"How NR5A2 sustains pluripotency at the chromatin level was incompletely understood; combined loss of Esrrb and Nr5a2 collapsed the pluripotency network by disrupting Oct4/Sox2/Nanog binding at co-occupied regulatory elements.","evidence":"Double-KO ESCs with ChIP-seq and transcriptomics","pmids":["34397088"],"confidence":"High","gaps":["Whether Nr5a2 and Esrrb function redundantly or synergistically at individual loci not resolved"]},{"year":2022,"claim":"Whether a specific transcription factor drives zygotic genome activation was a central question in early development; Nr5a2 was identified as an essential pioneer factor for ZGA, binding SINE B1/Alu elements in cis-regulatory regions of ~72% of ZGA genes and opening chromatin on nucleosomal templates in vitro.","evidence":"De novo motif analysis, genetic loss-of-function, ATAC-seq, in vitro nucleosome binding, and chemical inhibition in mouse embryos","pmids":["36423263"],"confidence":"High","gaps":["Whether NR5A2 is sufficient for ZGA or requires co-factors not determined","Human ZGA role not tested"]},{"year":2023,"claim":"Whether NR5A2 pioneer activity at ZGA is functionally linked to later lineage decisions was unknown; NR5A2 was shown to be dispensable for global 2-cell chromatin opening but essential for opening 8-cell-specific sites near pluripotency and trophectoderm genes, directly bridging ZGA to first lineage segregation.","evidence":"Nr5a2 knockout embryos with stage-resolved ChIP/CUT&TAG and ATAC-seq","pmids":["37935903"],"confidence":"High","gaps":["Mechanism by which NR5A2 selects 8-cell-specific versus 2-cell sites not defined"]},{"year":2024,"claim":"The structural basis for NR5A2 pioneer factor activity and its role as a bipotency activator were unresolved; cryo-EM showed the CTE loop displaces a nucleosomal minor-groove anchor to unwrap DNA, and genetic studies confirmed NR5A2 activates both ICM and TE lineage genes at the 8-cell stage. A hepatic FXR-FGF4-FGFR4-LRH-1 signaling node was also defined as a first-line bile acid checkpoint.","evidence":"Cryo-EM with mutagenesis (pioneer mechanism); Tfap2c/Nr5a2 double-KO in embryos (bipotency); genetic mouse models with ChIP (FGF4-LRH-1 node)","pmids":["38409506","38243114","39393353"],"confidence":"High","gaps":["Whether CTE-mediated unwrapping is sufficient for pioneer activity at all genomic loci not tested","Contribution of phospholipid ligands to pioneer function unknown","FXR-FGF4-LRH-1 axis not validated in human liver"]},{"year":null,"claim":"Key unresolved questions include how NR5A2 selects different genomic targets across developmental stages, whether endogenous PIP3 occupancy regulates pioneer activity, and how the SUMOylation–corepressor switch is coordinated with pioneer factor function during lineage commitment.","evidence":"","pmids":[],"confidence":"Medium","gaps":["No full-length NR5A2 structure available","In vivo phospholipid ligand identity and occupancy unresolved","Mechanism integrating post-translational modifications with pioneer activity unknown"]}],"mechanism_profile":{"molecular_activity":[{"term_id":"GO:0003677","term_label":"DNA binding","supporting_discovery_ids":[2,12,16,27]},{"term_id":"GO:0140110","term_label":"transcription regulator activity","supporting_discovery_ids":[0,4,8,9,11,17,19,21,31]},{"term_id":"GO:0008289","term_label":"lipid binding","supporting_discovery_ids":[1,24]}],"localization":[{"term_id":"GO:0005634","term_label":"nucleus","supporting_discovery_ids":[3,7,12,13]},{"term_id":"GO:0000228","term_label":"nuclear chromosome","supporting_discovery_ids":[2,12]},{"term_id":"GO:0005654","term_label":"nucleoplasm","supporting_discovery_ids":[3]}],"pathway":[{"term_id":"R-HSA-74160","term_label":"Gene expression (Transcription)","supporting_discovery_ids":[0,4,7,9,11,12,19,21]},{"term_id":"R-HSA-1430728","term_label":"Metabolism","supporting_discovery_ids":[5,6,9,16,17,33,34]},{"term_id":"R-HSA-1266738","term_label":"Developmental Biology","supporting_discovery_ids":[12,13,14,26]},{"term_id":"R-HSA-4839726","term_label":"Chromatin organization","supporting_discovery_ids":[2,12,13]},{"term_id":"R-HSA-168256","term_label":"Immune System","supporting_discovery_ids":[23,30,31]},{"term_id":"R-HSA-162582","term_label":"Signal Transduction","supporting_discovery_ids":[4,22,34]}],"complexes":[],"partners":["PROX1","SHP","GPS2","SIRT1","HNF4A","ESRRB","JUN"],"other_free_text":[]},"mechanistic_narrative":"NR5A2 (LRH-1) is a monomeric orphan nuclear receptor that functions as a ligand-regulated transcription factor and pioneer factor, governing bile acid and cholesterol homeostasis, steroidogenesis, lipid metabolism, pluripotency, zygotic genome activation, and immune cell maturation. Its ligand-binding domain adopts a constitutively active conformation stabilized by an extended helix 2 and can bind signaling phosphatidylinositols such as PIP3, which allosterically modulate coregulator selectivity [PMID:12820970, PMID:26416531, PMID:26553876]. Transcriptional output is fine-tuned by ERK-mediated phosphorylation of hinge-domain serines, SUMOylation at K289 that directs sequestration into PML nuclear bodies and recruitment of the corepressors PROX1 and N-CoR/GPS2, and SHP–SIRT1-dependent histone deacetylation at target promoters [PMID:16439367, PMID:15923626, PMID:25176150, PMID:20159957, PMID:20375098]. NR5A2 acts as a pioneer factor during zygotic genome activation by using a conserved CTE loop in its DNA-binding domain to compete with nucleosomal minor-groove anchors, unwrapping entry–exit DNA to open chromatin at SINE B1/Alu elements and at lineage-specifying loci required for both ICM and trophectoderm gene programs [PMID:36423263, PMID:38409506, PMID:37935903, PMID:38243114]."},"prefetch_data":{"uniprot":{"accession":"O00482","full_name":"Nuclear receptor subfamily 5 group A member 2","aliases":["Alpha-1-fetoprotein transcription factor","B1-binding factor","hB1F","CYP7A promoter-binding factor","Hepatocytic transcription factor","Liver receptor homolog 1","LRH-1"],"length_aa":541,"mass_kda":61.3,"function":"Orphan nuclear receptor that binds DNA as a monomer to the 5'-TCAAGGCCA-3' sequence and controls expression of target genes: regulates key biological processes, such as early embryonic development, cholesterol and bile acid synthesis pathways, as well as liver and pancreas morphogenesis (PubMed:16289203, PubMed:18410128, PubMed:21614002, PubMed:32433991, PubMed:38409506, PubMed:9786908). Ligand-binding causes conformational change which causes recruitment of coactivators, promoting target gene activation (PubMed:21614002). The specific ligand is unknown, but specific phospholipids, such as phosphatidylethanolamine, phosphatidylserine, dilauroyl phosphatidylcholine and diundecanoyl phosphatidylcholine can act as ligand in vitro (PubMed:15707893, PubMed:15723037, PubMed:15897460, PubMed:21614002, PubMed:22504882, PubMed:23737522, PubMed:26416531, PubMed:26553876). Acts as a pioneer transcription factor, which unwraps target DNA from histones and elicits local opening of closed chromatin (PubMed:38409506). Plays a central role during preimplantation stages of embryonic development (By similarity). Plays a minor role in zygotic genome activation (ZGA) by regulating a small set of two-cell stage genes (By similarity). Plays a major role in morula development (2-16 cells embryos) by acting as a master regulator at the 8-cell stage, controlling expression of lineage-specifying transcription factors and genes involved in mitosis, telomere maintenance and DNA repair (By similarity). Zygotic NR5A2 binds to both closed and open chromatin with other transcription factors, often at SINE B1/Alu repeats DNA elements, promoting chromatin accessibility at nearby regulatory regions (By similarity). Also involved in the epiblast stage of development and embryonic stem cell pluripotency, by promoting expression of POU5F1/OCT4 (PubMed:27984042). Regulates other processes later in development, such as formation of connective tissue in lower jaw and middle ear, neural stem cell differentiation, ovarian follicle development and Sertoli cell differentiation (By similarity). Involved in exocrine pancreas development and acinar cell differentiation (By similarity). Acts as an essential transcriptional regulator of lipid metabolism (PubMed:20159957). Key regulator of cholesterol 7-alpha-hydroxylase gene (CYP7A) expression in liver (PubMed:10359768). Also acts as a negative regulator of inflammation in different organs, such as, liver and pancreas (PubMed:20159957). Protects against intestinal inflammation via its ability to regulate glucocorticoid production (By similarity). Plays an anti-inflammatory role during the hepatic acute phase response by acting as a corepressor: inhibits the hepatic acute phase response by preventing dissociation of the N-Cor corepressor complex (PubMed:20159957). Acts as a regulator of immunity by promoting lymphocyte T-cell development, proliferation and effector functions (By similarity). Also involved in resolution of endoplasmic reticulum stress in the liver (By similarity) In constrast to isoform 1 and isoform 2, does not induce cholesterol 7-alpha-hydroxylase gene (CYP7A) promoter activity (Microbial infection) Plays a crucial role for hepatitis B virus gene transcription and DNA replication. Mechanistically, synergistically cooperates with HNF1A to up-regulate the activity of one of the critical cis-elements in the hepatitis B virus genome enhancer II (ENII)","subcellular_location":"Nucleus; Chromosome","url":"https://www.uniprot.org/uniprotkb/O00482/entry"},"depmap":{"release":"DepMap","has_data":true,"is_common_essential":false,"resolved_as":"","url":"https://depmap.org/portal/gene/NR5A2","classification":"Not Classified","n_dependent_lines":6,"n_total_lines":1208,"dependency_fraction":0.004966887417218543},"opencell":{"profiled":false,"resolved_as":"","ensg_id":"","cell_line_id":"","localizations":[],"interactors":[],"url":"https://opencell.sf.czbiohub.org/search/NR5A2","total_profiled":1310},"omim":[{"mim_id":"616031","title":"COILED-COIL DOMAIN-CONTAINING PROTEIN 141; CCDC141","url":"https://www.omim.org/entry/616031"},{"mim_id":"614826","title":"NYSTAGMUS 7, CONGENITAL, AUTOSOMAL DOMINANT; NYS7","url":"https://www.omim.org/entry/614826"},{"mim_id":"611371","title":"ZINC FINGER PROTEIN 653; ZNF653","url":"https://www.omim.org/entry/611371"},{"mim_id":"604630","title":"NUCLEAR RECEPTOR SUBFAMILY 0, GROUP B, MEMBER 2; NR0B2","url":"https://www.omim.org/entry/604630"},{"mim_id":"604453","title":"NUCLEAR RECEPTOR SUBFAMILY 5, GROUP A, MEMBER 2; NR5A2","url":"https://www.omim.org/entry/604453"}],"hpa":{"profiled":true,"resolved_as":"","reliability":"Uncertain","locations":[{"location":"Nuclear speckles","reliability":"Uncertain"}],"tissue_specificity":"Group enriched","tissue_distribution":"Detected in many","driving_tissues":[{"tissue":"intestine","ntpm":16.8},{"tissue":"liver","ntpm":36.1},{"tissue":"pancreas","ntpm":57.7}],"url":"https://www.proteinatlas.org/search/NR5A2"},"hgnc":{"alias_symbol":["FTZ-F1beta","hB1F","LRH-1","FTZ-F1","hB1F-2","B1F2","LRH1"],"prev_symbol":["FTF"]},"alphafold":{"accession":"O00482","domains":[{"cath_id":"3.30.50.10","chopping":"94-160","consensus_level":"high","plddt":92.9494,"start":94,"end":160},{"cath_id":"1.10.565.10","chopping":"302-539","consensus_level":"high","plddt":92.5451,"start":302,"end":539}],"viewer_url":"https://alphafold.ebi.ac.uk/entry/O00482","model_url":"https://alphafold.ebi.ac.uk/files/AF-O00482-F1-model_v6.cif","pae_url":"https://alphafold.ebi.ac.uk/files/AF-O00482-F1-predicted_aligned_error_v6.png","plddt_mean":72.12},"mouse_models":{"mgi_url":"https://www.informatics.jax.org/marker/summary?nomen=NR5A2","jax_strain_url":"https://www.jax.org/strain/search?query=NR5A2"},"sequence":{"accession":"O00482","fasta_url":"https://rest.uniprot.org/uniprotkb/O00482.fasta","uniprot_url":"https://www.uniprot.org/uniprotkb/O00482/entry","alphafold_viewer_url":"https://alphafold.ebi.ac.uk/entry/O00482"}},"corpus_meta":[{"pmid":"20096661","id":"PMC_20096661","title":"The 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crystallography and site-directed mutagenesis\",\n      \"journal\": \"Molecular cell\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 — crystal structure with mutagenesis validation in single rigorous study\",\n      \"pmids\": [\"12820970\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2015,\n      \"finding\": \"Crystal structure of human LRH-1 ligand binding domain bound by PIP3 shows that the phospholipid hormone binds LRH-1 with high affinity, stabilizing the receptor LBD; the hydrophobic PIP3 tails are buried inside the ligand binding pocket while the negatively charged head group is presented on the receptor surface, establishing signaling phosphatidylinositols as regulatory ligands for LRH-1.\",\n      \"method\": \"X-ray crystallography and in vitro binding assay\",\n      \"journal\": \"Journal of structural biology\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 — crystal structure with affinity measurement, reinforced by prior structural work on related receptor\",\n      \"pmids\": [\"26416531\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2024,\n      \"finding\": \"Cryo-EM structure of human NR5A2 bound to a nucleosome shows that the conserved C-terminal extension (CTE) loop of the NR5A2 DNA-binding domain competes with a DNA minor groove anchor of the nucleosome to release entry-exit site DNA; mutagenesis showed NR5A2 D159 of the CTE is dispensable for DNA binding but required for stable nucleosome association and persistent DNA unwrapping, defining a pioneer factor mechanism.\",\n      \"method\": \"Cryo-electron microscopy and mutational analysis\",\n      \"journal\": \"Nature structural & molecular biology\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 — cryo-EM structure plus mutagenesis with functional validation\",\n      \"pmids\": [\"38409506\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2005,\n      \"finding\": \"SUMOylation of LRH-1 causes its exclusive localization to promyelocytic leukemia protein (PML) nuclear bodies in a dynamic process demonstrated by FRET and FRAP; desumoylation releases LRH-1 from PML bodies allowing access to actively transcribed target genes, showing that SUMO-dependent compartmentalization prevents LRH-1 from accessing chromatin.\",\n      \"method\": \"FRET, FRAP, and fluorescence microscopy with SUMO mutant analysis\",\n      \"journal\": \"Molecular and cellular biology\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 — multiple orthogonal live-imaging methods with functional consequence demonstrated\",\n      \"pmids\": [\"15923626\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2006,\n      \"finding\": \"Phosphorylation of LRH-1 hinge domain serine residues S238 and S243 by mitogenic signaling through ERK1/2 stimulates transactivation; alanine substitution at both sites decreases PMA-dependent LRH-1 transactivation, while aspartate substitutions (phosphomimetic) increase basal transactivation.\",\n      \"method\": \"In vitro kinase assay, site-directed mutagenesis, and transcriptional reporter assay\",\n      \"journal\": \"The Journal of biological chemistry\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 — in vitro phosphorylation plus mutagenesis with functional readout\",\n      \"pmids\": [\"16439367\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2014,\n      \"finding\": \"SUMOylation of LRH-1 at K289 promotes interaction with the corepressor PROX1; mice carrying a SUMOylation-defective K289R mutation show decreased PROX1 interaction, increased reverse cholesterol transport gene expression, and develop less atherosclerosis on a high-cholesterol diet.\",\n      \"method\": \"Knock-in mouse model (K289R), co-immunoprecipitation, and metabolic phenotyping\",\n      \"journal\": \"Cell metabolism\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 — reciprocal interaction mapped to specific residue in vivo with disease phenotype\",\n      \"pmids\": [\"25176150\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2017,\n      \"finding\": \"SUMOylation-defective LRH-1 K289R mutation induces OSBPL3 expression, which enhances SREBP-1 processing and promotes de novo lipogenesis; silencing hepatic Osbpl3 reverses the lipogenic phenotype of LRH-1 K289R mice, establishing a LRH-1 SUMOylation → OSBPL3 → SREBP-1 pathway in NAFLD.\",\n      \"method\": \"Knock-in mouse model, adenoviral gene expression, siRNA knockdown, and lipid analysis\",\n      \"journal\": \"The Journal of clinical investigation\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 — epistasis established in vivo with orthogonal rescue experiment\",\n      \"pmids\": [\"28094767\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2010,\n      \"finding\": \"LRH-1 agonist-induced SUMOylation recruits LRH-1 to hepatic acute phase response (APR) promoters where it prevents clearance of the N-CoR corepressor complex upon cytokine stimulation; GPS2 functions as a transrepression mediator bridging SUMOylated LRH-1 to the N-CoR complex.\",\n      \"method\": \"ChIP, co-immunoprecipitation, SUMO-1 knockout mice, and promoter reporter assays\",\n      \"journal\": \"Genes & development\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 — multiple orthogonal methods plus in vivo knockout model\",\n      \"pmids\": [\"20159957\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2010,\n      \"finding\": \"The transcriptional corepressor SHP recruits SIRT1 histone deacetylase specifically to LRH-1 target gene promoters; SIRT1 deacetylates histones H3 and H4 at these promoters to repress LRH-1-dependent bile acid synthesis gene transcription (CYP7A1, SHP), in a manner dependent on SHP-SIRT1 interaction but not deacetylation of LRH-1 itself.\",\n      \"method\": \"Co-immunoprecipitation, ChIP, dominant-negative constructs, and reporter assays\",\n      \"journal\": \"Nucleic acids research\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 — reciprocal Co-IP plus ChIP with functional validation of mechanism\",\n      \"pmids\": [\"20375098\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2012,\n      \"finding\": \"HNF4α and LRH-1 cooperate in vivo to maintain basal Cyp7a1 expression and to enable SHP binding to the Cyp7a1 promoter, thereby facilitating FGF19-mediated repression of bile acid synthesis; HNF4α and LRH-1 promote active transcription histone marks on the Cyp7a1 promoter that are reversed by FGF19 in a SHP-dependent manner.\",\n      \"method\": \"Loss-of-function studies in mice, ChIP, and histone mark analysis\",\n      \"journal\": \"The Journal of biological chemistry\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 — genetic epistasis in vivo with ChIP mechanistic evidence\",\n      \"pmids\": [\"23038264\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2014,\n      \"finding\": \"LRH-1 initiates an ER stress resolution pathway independent of known UPR components by inducing expression of the kinase Plk3, which phosphorylates and activates the transcription factor ATF2; Plk3-null mice cannot resolve ER stress, and restoring Plk3 in Lrh-1-null cells rescues ER stress resolution.\",\n      \"method\": \"Hepatic Lrh-1 knockout mice, Plk3 knockout mice, rescue experiments, and in vitro stress assays\",\n      \"journal\": \"eLife\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 — genetic epistasis with complementation rescue across two knockout models\",\n      \"pmids\": [\"24737860\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2010,\n      \"finding\": \"Nr5a2 (LRH-1) can replace Oct4 in reprogramming mouse somatic cells to iPSCs; it functions in part by activating Nanog expression and shares common genomic targets with Sox2 and Klf4 as revealed by genome-wide location analysis. Sumoylation mutants of Nr5a2 with enhanced transcriptional activity further increase reprogramming efficiency.\",\n      \"method\": \"Retroviral reprogramming, genome-wide ChIP analysis, and luciferase reporter assays\",\n      \"journal\": \"Cell stem cell\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 — functional replacement assay plus genome-wide binding analysis, widely cited\",\n      \"pmids\": [\"20096661\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2022,\n      \"finding\": \"Nr5a2 is an essential pioneer factor for zygotic genome activation (ZGA) in mouse two-cell embryos; it binds its motif within SINE B1/Alu retrotransposable elements in cis-regulatory regions of ZGA genes, promotes chromatin accessibility during ZGA, and binds nucleosomal DNA in vitro. Chemical inhibition indicates 72% of ZGA genes are regulated by Nr5a2.\",\n      \"method\": \"De novo motif search, knockout/knockdown, ATAC-seq, in vitro nucleosome binding, and chemical inhibition\",\n      \"journal\": \"Science (New York, N.Y.)\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1-2 — multiple orthogonal methods including in vitro nucleosomal binding and genetic loss-of-function\",\n      \"pmids\": [\"36423263\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2023,\n      \"finding\": \"NR5A2 bridges ZGA to the first lineage segregation in totipotent mouse embryos; it is not required for global chromatin opening at the 2-cell stage but is essential for opening 8-cell-specific binding sites near blastocyst/stem cell regulatory genes. NR5A2 directly regulates key pluripotency genes (Nanog, Pou5f1/Oct4) and trophectoderm genes (Tead4, Gata3) at the 8-cell stage.\",\n      \"method\": \"Nr5a2 knockout, genome-wide chromatin binding (ChIP/CUT&TAG), ATAC-seq, and transcriptome analysis\",\n      \"journal\": \"Cell research\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 — genome-wide binding plus genetic knockout with stage-specific mechanistic resolution\",\n      \"pmids\": [\"37935903\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2024,\n      \"finding\": \"NR5A2 acts as a bipotency activator in totipotent embryos, binding and activating both early trophectoderm (TE) and inner cell mass (ICM) lineage genes at the 8-cell stage; Nr5a2 deficiency causes downregulation of both ICM genes (Nanog) and TE genes in 8-cell embryos.\",\n      \"method\": \"Tfap2c and Nr5a2 knockout, ChIP-seq in embryos, and transcriptome analysis\",\n      \"journal\": \"Nature structural & molecular biology\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 — genome-wide binding and genetic loss-of-function in vivo with lineage-specific readout\",\n      \"pmids\": [\"38243114\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2004,\n      \"finding\": \"The homeodomain protein Prox1 functions as a co-repressor for LRH-1/NR5A2, representing a conserved functional interaction analogous to the Drosophila FTZ/FTZ-F1 cofactor relationship; this interaction is proposed to regulate cholesterol homeostasis in the enterohepatic system.\",\n      \"method\": \"Co-immunoprecipitation, reporter assays, and functional characterization\",\n      \"journal\": \"EMBO reports\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 3 — single lab pulldown/reporter, functional conservation argument\",\n      \"pmids\": [\"15143342\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2004,\n      \"finding\": \"LRH-1 binds a specific site at nucleotides 134-142 of the ABCG5/ABCG8 intergenic region, and this binding site is necessary for activity of both the ABCG5 and ABCG8 promoters; EMSA with HepG2 nuclear extracts confirmed LRH-1 binding, and overexpression increased promoter activity.\",\n      \"method\": \"EMSA, promoter mutagenesis, luciferase reporter assay\",\n      \"journal\": \"Journal of lipid research\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 — direct DNA binding demonstrated by EMSA with mutagenesis confirmation\",\n      \"pmids\": [\"15121760\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2006,\n      \"finding\": \"LRH-1 (NR5A2) promotes expression of steroidogenic enzymes and synthesis of corticosterone in murine intestinal epithelial cells; LRH-1 haplo-insufficiency strongly reduces intestinal expression of steroidogenic enzymes and glucocorticoid synthesis upon immunological stress in vivo.\",\n      \"method\": \"LRH-1 haploinsufficient mice, in vitro steroidogenesis assays\",\n      \"journal\": \"The Journal of experimental medicine\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 — genetic loss-of-function in vivo with specific biochemical phenotype\",\n      \"pmids\": [\"16923850\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2013,\n      \"finding\": \"Nr5a2 maintains acinar cell differentiation and is required for re-establishing acinar fate during regeneration; Nr5a2 deletion in the pancreas leads to acinar-to-ductal metaplasia, loss of regenerative capacity, and dramatically accelerates oncogenic Kras-driven preneoplastic lesion development.\",\n      \"method\": \"Conditional pancreatic Nr5a2 knockout mice, caerulein pancreatitis, and Kras-driven cancer model\",\n      \"journal\": \"Gut\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 — conditional KO with multiple disease phenotype readouts\",\n      \"pmids\": [\"23645620\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2018,\n      \"finding\": \"NR5A2 links differentiation and inflammation in the pancreas by undergoing a transcriptional switch that relocates binding from differentiation-specific to inflammatory genes, promoting AP-1-dependent transcription; pancreatic deletion of Jun rescues the pre-inflammatory phenotype and NR5A2 binding to inflammatory gene promoters.\",\n      \"method\": \"Global transcriptomics, ChIP-seq, and Jun conditional knockout epistasis\",\n      \"journal\": \"Nature\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 — genome-wide binding with genetic epistasis rescue experiment\",\n      \"pmids\": [\"29443959\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2014,\n      \"finding\": \"LRH-1 is required for luteinization in the female mouse ovary; Nr5a2 depletion from antral follicle granulosa cells permits formation of luteal-like structures but not functional corpora lutea, with reduced progesterone levels due in part to defects in cholesterol transport (down-regulation of Scarb1, Ldlr, and Star).\",\n      \"method\": \"Conditional granulosa-specific Nr5a2 knockout mice and steroidogenic pathway analysis\",\n      \"journal\": \"Endocrinology\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 — conditional KO with specific biochemical and reproductive phenotype\",\n      \"pmids\": [\"24552399\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2013,\n      \"finding\": \"LRH-1 directly binds to the kisspeptin (Kiss1) promoter and stimulates Kiss1 transcription; deletion of LRH-1 from kisspeptin neurons decreases Kiss1 expression in the arcuate nucleus, reduces FSH levels, dysregulates follicle maturation, and prolongs the estrous cycle, while LRH-1 overexpression increases Kiss1 expression and FSH.\",\n      \"method\": \"Conditional neuron-specific knockout, overexpression, ChIP, and reporter assays\",\n      \"journal\": \"Molecular endocrinology (Baltimore, Md.)\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 — direct promoter binding demonstrated plus in vivo gain/loss-of-function\",\n      \"pmids\": [\"23504956\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2014,\n      \"finding\": \"TNF suppresses intestinal glucocorticoid synthesis by activating c-Jun and NF-κB transcription factors, which both interact with NR5A2 and repress Cyp11a1 reporter activity; this repression is relieved by dominant-negative JNK1, IκB, or a JNK inhibitor.\",\n      \"method\": \"Reporter assay, co-immunoprecipitation, and mouse colitis model with pharmacological rescue\",\n      \"journal\": \"Science signaling\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 — direct protein-protein interaction demonstrated plus in vivo pharmacological rescue\",\n      \"pmids\": [\"24570488\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2015,\n      \"finding\": \"LRH-1 mediates IL-13-induced macrophage polarization through generation of 15-HETE PPARγ ligands; LRH-1 loss-of-function in macrophages impairs generation of 15-HETE due to compromised regulation of CYP1A1 and CYP1B1, thereby blocking IL-13-induced alternative activation and increasing susceptibility to Candida albicans infection.\",\n      \"method\": \"LRH-1-deficient macrophage mice, lipid metabolite analysis, in vivo infection model\",\n      \"journal\": \"Nature communications\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 — conditional macrophage KO with pathway-specific metabolite readout and in vivo phenotype\",\n      \"pmids\": [\"25873311\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2015,\n      \"finding\": \"X-ray crystallography and molecular modeling identify an allosteric network in LRH-1 that links phospholipid binding in the ligand binding pocket to an alternate activation function (AF) region encompassing the β-sheet-H6 region, which in turn communicates with the classical AF2 surface to dictate co-regulator selectivity.\",\n      \"method\": \"X-ray crystallography and molecular dynamics simulation\",\n      \"journal\": \"The Journal of biological chemistry\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 1 — structural plus computational, but coregulator selectivity not validated by mutagenesis in this study\",\n      \"pmids\": [\"26553876\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2016,\n      \"finding\": \"NR5A2 controls neural stem cell fate decisions by synchronizing cell-cycle exit with neurogenesis induction and astrogliogenesis inhibition through direct regulatory effects on the Ink4/Arf locus, Prox1, Notch1, and JAK/STAT signaling pathways.\",\n      \"method\": \"Overexpression and loss-of-function in primary neural stem cells and mouse embryos\",\n      \"journal\": \"Nature communications\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2-3 — multiple targets identified but direct binding not established for all; single lab\",\n      \"pmids\": [\"27447294\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2006,\n      \"finding\": \"NR5A2-null embryos display impaired primitive streak formation; aggregation experiments with wild-type tetraploid cells show that NR5A2 mutant epiblast cells can undergo normal gastrulation, demonstrating that NR5A2 is required specifically in extraembryonic tissues for proper primitive streak morphogenesis.\",\n      \"method\": \"Knockout mouse model and tetraploid aggregation rescue experiment\",\n      \"journal\": \"Developmental dynamics\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 — epistasis via tetraploid complementation clearly placing gene requirement in extraembryonic tissue\",\n      \"pmids\": [\"17075876\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2011,\n      \"finding\": \"LRH-1 directly occupies aromatase promoter II (PII) in breast adipose stromal fibroblasts as shown by chromatin immunoprecipitation; shRNA knockdown of LRH-1 decreases both PII activity and total aromatase mRNA, demonstrating LRH-1 as a tissue-specific transcriptional driver of aromatase expression.\",\n      \"method\": \"Chromatin immunoprecipitation (ChIP) and shRNA knockdown\",\n      \"journal\": \"Steroids\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 — direct chromatin occupancy shown by ChIP with functional KD confirmation, single lab\",\n      \"pmids\": [\"21392518\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2018,\n      \"finding\": \"LRH-1 directly transactivates several key steroidogenic enzyme genes to promote de novo androgen biosynthesis in castration-resistant prostate cancer; pharmacological inhibition of LRH-1 attenuates LRH-1-mediated androgen elevation and reduces AR signaling in CRPC xenografts.\",\n      \"method\": \"Luciferase reporter assays, ChIP, xenograft models, and pharmacological inhibition\",\n      \"journal\": \"Cancer research\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 — direct promoter binding shown by ChIP with in vivo functional validation\",\n      \"pmids\": [\"29438990\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2021,\n      \"finding\": \"Combined loss of Esrrb and Nr5a2 collapses the pluripotency network in mouse ESCs; the two orphan nuclear receptors occupy a large common set of regulatory elements and control the binding of Oct4, Sox2, and Nanog to DNA.\",\n      \"method\": \"Double knockout ESCs, ChIP-seq, and transcriptome analysis\",\n      \"journal\": \"Development (Cambridge, England)\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 — genome-wide binding analysis plus genetic double-KO demonstrating epistasis over core pluripotency factors\",\n      \"pmids\": [\"34397088\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2019,\n      \"finding\": \"LRH-1 is expressed in T lymphocytes and is required for T cell maturation and function; T cell-specific deletion of LRH-1 causes loss of mature peripheral T cells, reduced CD4+ T cell proliferation, failure to mount immune responses, and CD8+ T cell failure to control viral infections.\",\n      \"method\": \"T cell-specific conditional knockout mice, in vitro and in vivo T cell functional assays\",\n      \"journal\": \"Science advances\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 — conditional KO with multiple defined cellular and in vivo immune phenotypes\",\n      \"pmids\": [\"31328159\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2017,\n      \"finding\": \"LRH-1/NR5A2 directly binds to binding sites in the FASLG promoter and drives FASLG promoter activity; mutations in LRH-1 binding sites reduce FASLG promoter activity, and pharmacological inhibition of LRH-1 decreases FasL expression and FasL-mediated T cell apoptosis and cytotoxicity.\",\n      \"method\": \"Luciferase reporter assay, promoter mutagenesis, pharmacological inhibition, and mouse hepatitis model\",\n      \"journal\": \"Cell death & disease\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 — direct binding site mutagenesis plus functional pharmacological validation in vivo\",\n      \"pmids\": [\"28406481\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2022,\n      \"finding\": \"LRH-1 regulates a PTGS2/COX2-PGE2-PTGER1 signaling axis in pancreatic islets; LRH-1 ablation in developing beta cells abolished BL001 agonist protection against apoptosis and blunted Ptgs2 induction, while PTGER1 antagonism negated LRH-1-mediated islet survival.\",\n      \"method\": \"Beta cell-specific conditional knockout, pharmacological agonist/antagonist, and islet survival assays\",\n      \"journal\": \"iScience\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 — conditional KO with pathway-level rescue/antagonist experiments, single lab\",\n      \"pmids\": [\"35602948\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2018,\n      \"finding\": \"LRH-1 is required for maintaining arachidonoyl (AA) phospholipid pools in the liver; hepatic LRH-1 knockout leads to large cytosolic lipid droplets, increased triglycerides, and reduced AA phospholipids due to repression of Elovl5 and Fads2 genes critical for AA biosynthesis.\",\n      \"method\": \"Acute hepatic knockout (AAV8-Cre), lipidomics, and genomic analysis\",\n      \"journal\": \"JCI insight\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 — clean KO with lipidomics and genomic evidence establishing mechanistic link\",\n      \"pmids\": [\"29515023\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2024,\n      \"finding\": \"Hepatic FXR-FGF4 paracrine signaling acts through an intracellular FGFR4-LRH-1 signaling node to downregulate Cyp7a1 and Cyp8b1; this liver-centric pathway serves as a first-line checkpoint for intrahepatic bile acid flux upstream of the peripheral FXR-FGF15/19 pathway.\",\n      \"method\": \"Genetic mouse models, pharmacological inhibition, and ChIP analysis\",\n      \"journal\": \"Cell metabolism\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 — defined signaling node with in vivo genetic evidence, single study\",\n      \"pmids\": [\"39393353\"],\n      \"is_preprint\": false\n    }\n  ],\n  \"current_model\": \"NR5A2/LRH-1 is a constitutively active orphan nuclear receptor (stabilized by a unique extended helix 2 in its LBD) that can bind phosphatidylinositol phospholipids (including PIP3) as regulatory ligands; its transcriptional activity is fine-tuned by ERK-dependent phosphorylation of hinge-domain serines, SUMOylation-dependent sequestration into PML nuclear bodies or recruitment of corepressors (PROX1, N-CoR/GPS2, SHP-SIRT1), and interaction with cofactors including HNF4α; it functions as a pioneer factor that uses its CTE loop to compete with nucleosome minor-groove anchors to open chromatin, driving ZGA in totipotent embryos, maintaining acinar and pluripotent cell identity, regulating bile acid/cholesterol/lipid/glucocorticoid synthesis across liver, intestine, and steroidogenic tissues, and controlling T cell maturation and immune responses.\"\n}\n```","stage2_raw":"```json\n{\n  \"mechanistic_narrative\": \"NR5A2 (LRH-1) is a monomeric orphan nuclear receptor that functions as a ligand-regulated transcription factor and pioneer factor, governing bile acid and cholesterol homeostasis, steroidogenesis, lipid metabolism, pluripotency, zygotic genome activation, and immune cell maturation. Its ligand-binding domain adopts a constitutively active conformation stabilized by an extended helix 2 and can bind signaling phosphatidylinositols such as PIP3, which allosterically modulate coregulator selectivity [PMID:12820970, PMID:26416531, PMID:26553876]. Transcriptional output is fine-tuned by ERK-mediated phosphorylation of hinge-domain serines, SUMOylation at K289 that directs sequestration into PML nuclear bodies and recruitment of the corepressors PROX1 and N-CoR/GPS2, and SHP–SIRT1-dependent histone deacetylation at target promoters [PMID:16439367, PMID:15923626, PMID:25176150, PMID:20159957, PMID:20375098]. NR5A2 acts as a pioneer factor during zygotic genome activation by using a conserved CTE loop in its DNA-binding domain to compete with nucleosomal minor-groove anchors, unwrapping entry–exit DNA to open chromatin at SINE B1/Alu elements and at lineage-specifying loci required for both ICM and trophectoderm gene programs [PMID:36423263, PMID:38409506, PMID:37935903, PMID:38243114].\",\n  \"teleology\": [\n    {\n      \"year\": 2003,\n      \"claim\": \"How LRH-1 achieves constitutive transcriptional activity without a bound ligand was unknown; the crystal structure revealed an extended helix 2 that stabilizes an active LBD conformation with a large empty pocket, establishing the structural basis for ligand-independent activity.\",\n      \"evidence\": \"X-ray crystallography at 2.4 Å with site-directed mutagenesis of helix 2 arginine\",\n      \"pmids\": [\"12820970\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Identity of endogenous regulatory ligands not established\", \"No structure of full-length receptor\"]\n    },\n    {\n      \"year\": 2004,\n      \"claim\": \"Which corepressors restrain LRH-1 activity was unclear; identification of Prox1 as an LRH-1 co-repressor and demonstration that LRH-1 directly binds the ABCG5/ABCG8 intergenic region established its role in cholesterol efflux gene regulation.\",\n      \"evidence\": \"Co-immunoprecipitation, reporter assays (Prox1); EMSA and promoter mutagenesis (ABCG5/G8)\",\n      \"pmids\": [\"15143342\", \"15121760\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Prox1–LRH-1 interaction mapped only by single-lab Co-IP and reporter\", \"In vivo relevance of ABCG5/G8 regulation by LRH-1 not tested genetically\"]\n    },\n    {\n      \"year\": 2005,\n      \"claim\": \"How post-translational modification controls LRH-1 subnuclear distribution was unknown; live-cell imaging showed SUMOylation dynamically sequesters LRH-1 into PML nuclear bodies, preventing chromatin access and target gene activation.\",\n      \"evidence\": \"FRET, FRAP, and fluorescence microscopy with SUMO-site mutants\",\n      \"pmids\": [\"15923626\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Which SUMO E3 ligase targets LRH-1 in vivo not identified\", \"Quantitative impact on target gene panels not assessed genome-wide\"]\n    },\n    {\n      \"year\": 2006,\n      \"claim\": \"Whether mitogenic signaling modulates LRH-1 was untested; ERK1/2-dependent phosphorylation of hinge serines S238/S243 was shown to stimulate transactivation, linking growth factor pathways to LRH-1 output. Simultaneously, LRH-1 was found to drive intestinal glucocorticoid synthesis and to be required in extraembryonic tissues for primitive streak formation.\",\n      \"evidence\": \"In vitro kinase assay and phosphomimetic mutagenesis (ERK); haploinsufficient mice and steroidogenesis assays (intestinal GC); knockout with tetraploid aggregation rescue (gastrulation)\",\n      \"pmids\": [\"16439367\", \"16923850\", \"17075876\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Upstream receptor-to-ERK pathway in physiological LRH-1 contexts not defined\", \"Extraembryonic target genes mediating gastrulation rescue not identified\"]\n    },\n    {\n      \"year\": 2010,\n      \"claim\": \"How SUMOylation mechanistically represses specific gene sets and whether LRH-1 has roles beyond metabolism were open questions; SUMOylation was shown to recruit LRH-1 and the N-CoR/GPS2 complex to acute-phase response promoters for transrepression, SHP–SIRT1 was found to deacetylate histones at bile acid synthesis genes, and LRH-1 was demonstrated to replace Oct4 in somatic cell reprogramming by activating Nanog.\",\n      \"evidence\": \"ChIP and Co-IP with SUMO-1 KO mice (transrepression); Co-IP and ChIP with dominant-negatives (SHP–SIRT1); retroviral reprogramming and genome-wide ChIP (iPSC)\",\n      \"pmids\": [\"20159957\", \"20375098\", \"20096661\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Transrepression mechanism at APR genes not shown to be genome-wide\", \"Whether LRH-1 directly opens chromatin during reprogramming not tested\"]\n    },\n    {\n      \"year\": 2012,\n      \"claim\": \"How LRH-1 and HNF4α coordinately regulate Cyp7a1 was unclear; cooperative binding was shown to maintain basal expression and enable SHP-mediated FGF19 repression through histone mark remodeling.\",\n      \"evidence\": \"Hepatocyte-specific loss-of-function in mice with ChIP and histone mark analysis\",\n      \"pmids\": [\"23038264\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Stoichiometric relationship and co-occupancy dynamics of LRH-1/HNF4α not resolved\"]\n    },\n    {\n      \"year\": 2013,\n      \"claim\": \"Whether LRH-1 has tissue-maintenance roles beyond metabolism was uncertain; pancreatic Nr5a2 deletion caused acinar-to-ductal metaplasia and accelerated Kras-driven neoplasia, while neuron-specific deletion disrupted Kiss1-dependent reproductive axis control.\",\n      \"evidence\": \"Conditional pancreatic and kisspeptin-neuron knockout mice with disease and endocrine phenotyping\",\n      \"pmids\": [\"23645620\", \"23504956\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Direct versus indirect target genes in acinar maintenance not fully delineated\", \"Whether Kiss1 regulation is the sole mechanism for reproductive phenotype not established\"]\n    },\n    {\n      \"year\": 2014,\n      \"claim\": \"The in vivo consequences of LRH-1 SUMOylation and its broader cytoprotective functions were undefined; K289R knock-in mice showed reduced PROX1 interaction and enhanced reverse cholesterol transport (reducing atherosclerosis), LRH-1 was found to resolve ER stress via a Plk3→ATF2 pathway, and ovarian Nr5a2 loss impaired luteinization and progesterone synthesis.\",\n      \"evidence\": \"K289R knock-in mice with metabolic phenotyping; hepatic and Plk3 double-KO with rescue; granulosa-specific KO with steroidogenic analysis\",\n      \"pmids\": [\"25176150\", \"24737860\", \"24552399\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Whether SUMO-PROX1 axis operates in tissues beyond liver not tested\", \"Plk3–ATF2 pathway not confirmed outside hepatocytes\"]\n    },\n    {\n      \"year\": 2015,\n      \"claim\": \"How phospholipid binding is transduced to coregulator selection and how LRH-1 participates in innate immunity were open; PIP3 was crystallized in the LBD pocket, an allosteric network linking the pocket to AF2 was mapped, and macrophage LRH-1 was shown to generate 15-HETE PPARγ ligands for alternative activation.\",\n      \"evidence\": \"X-ray crystallography and MD simulations (PIP3/allosteric); macrophage-specific KO with lipidomics and Candida infection model\",\n      \"pmids\": [\"26416531\", \"26553876\", \"25873311\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Allosteric coregulator selectivity not validated by mutagenesis\", \"In vivo PIP3 occupancy of LRH-1 not demonstrated\"]\n    },\n    {\n      \"year\": 2017,\n      \"claim\": \"Downstream metabolic consequences of LRH-1 de-SUMOylation and its role in FasL-mediated immunity were unclear; K289R mice developed NAFLD through an LRH-1→OSBPL3→SREBP-1 lipogenic pathway, and LRH-1 was shown to directly activate the FASLG promoter controlling T cell cytotoxicity.\",\n      \"evidence\": \"K289R knock-in with siRNA rescue (NAFLD); FASLG promoter mutagenesis and pharmacological inhibition in hepatitis model\",\n      \"pmids\": [\"28094767\", \"28406481\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"OSBPL3 regulation in human NAFLD not confirmed\", \"FASLG regulation shown mainly in single lab\"]\n    },\n    {\n      \"year\": 2018,\n      \"claim\": \"How NR5A2 loss triggers inflammation and what hepatic lipid species it controls were unresolved; ChIP-seq revealed NR5A2 undergoes a binding switch from differentiation to AP-1-dependent inflammatory genes (reversed by Jun deletion), and hepatic KO depleted arachidonoyl phospholipids via Elovl5/Fads2 repression.\",\n      \"evidence\": \"ChIP-seq with Jun conditional KO epistasis (pancreas); acute hepatic KO with lipidomics\",\n      \"pmids\": [\"29438990\", \"29443959\", \"29515023\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Whether the NR5A2-to-AP-1 switch occurs in human pancreatic disease not established\", \"Prostate steroidogenic role based on xenograft, not genetic model\"]\n    },\n    {\n      \"year\": 2019,\n      \"claim\": \"Whether LRH-1 functions in adaptive immunity was unknown; T cell-specific deletion revealed LRH-1 is essential for T cell maturation, proliferation, and antiviral responses.\",\n      \"evidence\": \"T cell-specific conditional knockout mice with in vivo viral challenge\",\n      \"pmids\": [\"31328159\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Direct transcriptional targets mediating T cell maturation not identified genome-wide\", \"Mechanism of CD8+ T cell failure not molecularly defined\"]\n    },\n    {\n      \"year\": 2021,\n      \"claim\": \"How NR5A2 sustains pluripotency at the chromatin level was incompletely understood; combined loss of Esrrb and Nr5a2 collapsed the pluripotency network by disrupting Oct4/Sox2/Nanog binding at co-occupied regulatory elements.\",\n      \"evidence\": \"Double-KO ESCs with ChIP-seq and transcriptomics\",\n      \"pmids\": [\"34397088\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Whether Nr5a2 and Esrrb function redundantly or synergistically at individual loci not resolved\"]\n    },\n    {\n      \"year\": 2022,\n      \"claim\": \"Whether a specific transcription factor drives zygotic genome activation was a central question in early development; Nr5a2 was identified as an essential pioneer factor for ZGA, binding SINE B1/Alu elements in cis-regulatory regions of ~72% of ZGA genes and opening chromatin on nucleosomal templates in vitro.\",\n      \"evidence\": \"De novo motif analysis, genetic loss-of-function, ATAC-seq, in vitro nucleosome binding, and chemical inhibition in mouse embryos\",\n      \"pmids\": [\"36423263\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Whether NR5A2 is sufficient for ZGA or requires co-factors not determined\", \"Human ZGA role not tested\"]\n    },\n    {\n      \"year\": 2023,\n      \"claim\": \"Whether NR5A2 pioneer activity at ZGA is functionally linked to later lineage decisions was unknown; NR5A2 was shown to be dispensable for global 2-cell chromatin opening but essential for opening 8-cell-specific sites near pluripotency and trophectoderm genes, directly bridging ZGA to first lineage segregation.\",\n      \"evidence\": \"Nr5a2 knockout embryos with stage-resolved ChIP/CUT&TAG and ATAC-seq\",\n      \"pmids\": [\"37935903\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Mechanism by which NR5A2 selects 8-cell-specific versus 2-cell sites not defined\"]\n    },\n    {\n      \"year\": 2024,\n      \"claim\": \"The structural basis for NR5A2 pioneer factor activity and its role as a bipotency activator were unresolved; cryo-EM showed the CTE loop displaces a nucleosomal minor-groove anchor to unwrap DNA, and genetic studies confirmed NR5A2 activates both ICM and TE lineage genes at the 8-cell stage. A hepatic FXR-FGF4-FGFR4-LRH-1 signaling node was also defined as a first-line bile acid checkpoint.\",\n      \"evidence\": \"Cryo-EM with mutagenesis (pioneer mechanism); Tfap2c/Nr5a2 double-KO in embryos (bipotency); genetic mouse models with ChIP (FGF4-LRH-1 node)\",\n      \"pmids\": [\"38409506\", \"38243114\", \"39393353\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Whether CTE-mediated unwrapping is sufficient for pioneer activity at all genomic loci not tested\", \"Contribution of phospholipid ligands to pioneer function unknown\", \"FXR-FGF4-LRH-1 axis not validated in human liver\"]\n    },\n    {\n      \"year\": null,\n      \"claim\": \"Key unresolved questions include how NR5A2 selects different genomic targets across developmental stages, whether endogenous PIP3 occupancy regulates pioneer activity, and how the SUMOylation–corepressor switch is coordinated with pioneer factor function during lineage commitment.\",\n      \"evidence\": \"\",\n      \"pmids\": [],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"No full-length NR5A2 structure available\", \"In vivo phospholipid ligand identity and occupancy unresolved\", \"Mechanism integrating post-translational modifications with pioneer activity unknown\"]\n    }\n  ],\n  \"mechanism_profile\": {\n    \"molecular_activity\": [\n      {\"term_id\": \"GO:0003677\", \"supporting_discovery_ids\": [2, 12, 16, 27]},\n      {\"term_id\": \"GO:0140110\", \"supporting_discovery_ids\": [0, 4, 8, 9, 11, 17, 19, 21, 31]},\n      {\"term_id\": \"GO:0008289\", \"supporting_discovery_ids\": [1, 24]}\n    ],\n    \"localization\": [\n      {\"term_id\": \"GO:0005634\", \"supporting_discovery_ids\": [3, 7, 12, 13]},\n      {\"term_id\": \"GO:0000228\", \"supporting_discovery_ids\": [2, 12]},\n      {\"term_id\": \"GO:0005654\", \"supporting_discovery_ids\": [3]}\n    ],\n    \"pathway\": [\n      {\"term_id\": \"R-HSA-74160\", \"supporting_discovery_ids\": [0, 4, 7, 9, 11, 12, 19, 21]},\n      {\"term_id\": \"R-HSA-1430728\", \"supporting_discovery_ids\": [5, 6, 9, 16, 17, 33, 34]},\n      {\"term_id\": \"R-HSA-1266738\", \"supporting_discovery_ids\": [12, 13, 14, 26]},\n      {\"term_id\": \"R-HSA-4839726\", \"supporting_discovery_ids\": [2, 12, 13]},\n      {\"term_id\": \"R-HSA-168256\", \"supporting_discovery_ids\": [23, 30, 31]},\n      {\"term_id\": \"R-HSA-162582\", \"supporting_discovery_ids\": [4, 22, 34]}\n    ],\n    \"complexes\": [],\n    \"partners\": [\n      \"PROX1\",\n      \"SHP\",\n      \"GPS2\",\n      \"SIRT1\",\n      \"HNF4A\",\n      \"ESRRB\",\n      \"JUN\"\n    ],\n    \"other_free_text\": []\n  }\n}\n```"}