{"gene":"NRIP1","run_date":"2026-06-10T05:19:52","timeline":{"discoveries":[{"year":1995,"finding":"RIP140 (NRIP1) directly interacts in vitro with the ligand-dependent activation domain AF2 of the estrogen receptor; this interaction is increased by estrogen but not by anti-estrogens, and the in vitro binding capacity of mutant receptors correlates with their ability to stimulate transcription. RIP140 also co-immunoprecipitates with ER in intact cells and modulates ER transcriptional activity in the presence of estrogen.","method":"In vitro binding assay, co-immunoprecipitation in intact cells, transient transfection reporter assay","journal":"The EMBO journal","confidence":"High","confidence_rationale":"Tier 2 / Strong — reciprocal Co-IP, in vitro binding, functional reporter assay, founding paper replicated widely","pmids":["7641693"],"is_preprint":false},{"year":1996,"finding":"RIP140 contains two distinct binding sites (site 1 and site 2) that independently interact with the ligand-binding domain of the estrogen receptor both in solution and when the receptor is bound to DNA; both sites interact with thyroid hormone and retinoic acid receptors, while retinoid X receptor interaction is mediated primarily by site 1. When fused to heterologous DNA-binding domains, RIP140 stimulates transcription in yeast and mammalian cells, suggesting it bridges receptors to the basal transcription machinery.","method":"In vitro binding/pulldown mapping, reporter gene assays in yeast and mammalian cells","journal":"Molecular and cellular biology","confidence":"High","confidence_rationale":"Tier 1–2 / Strong — in vitro domain mapping combined with functional transcription assays in two cell systems","pmids":["8887632"],"is_preprint":false},{"year":1998,"finding":"RIP140 forms ternary complexes with PPAR/RXR heterodimers in the presence of RXR ligands, shows high affinity for the RXR subunit, and generally down-regulates nuclear receptor activity in mammalian cells. In vitro binding of RIP140 and SRC-1 to nuclear receptors is competitive, and RIP140 specifically down-regulates coactivation by SRC-1, suggesting it acts as an indirect inhibitor of AF-2 by competing with coactivators.","method":"GST-pulldown, yeast two-hybrid, mammalian cell co-transfection, competitive binding assay","journal":"Molecular endocrinology","confidence":"High","confidence_rationale":"Tier 1–2 / Moderate — multiple orthogonal methods (pulldown, two-hybrid, functional assay) in single lab","pmids":["9626662"],"is_preprint":false},{"year":1998,"finding":"RIP140 interacts with the ligand-binding domain of orphan receptor TR2 via LXXLL motifs; the TR2 AF-2 region mediates the interaction. RIP140 functions as a corepressor for TR2 and suppresses RA-receptor-mediated RA induction. Co-immunoprecipitation and GFP nuclear translocation experiments confirmed the RIP140–TR2 interaction in vivo.","method":"Yeast two-hybrid, domain mapping, GAL4 reporter, co-immunoprecipitation, GFP nuclear translocation","journal":"Molecular and cellular biology","confidence":"High","confidence_rationale":"Tier 2 / Moderate — reciprocal Co-IP, domain-mapping, functional reporter in single lab with multiple orthogonal approaches","pmids":["9774688"],"is_preprint":false},{"year":1999,"finding":"RIP140 interacts with the aryl hydrocarbon receptor (AhR) but not with ARNT, both in vitro and in cells. The AhR interaction is mediated by its transactivation domain Q-rich subdomain, and the RIP140 interaction domain maps to residues 154–350, distinct from the ER-binding domain. LXXLL motifs are not required for RIP140 binding to AhR. RIP140 enhanced TCDD-mediated dioxin response element-driven reporter gene activity.","method":"Co-immunoprecipitation, co-localization assays, domain mapping, reporter gene assay in three cell lines","journal":"The Journal of biological chemistry","confidence":"High","confidence_rationale":"Tier 2 / Moderate — reciprocal Co-IP plus domain mapping and functional assay across multiple cell lines","pmids":["10428779"],"is_preprint":false},{"year":1999,"finding":"RIP140 antagonizes all tested glucocorticoid receptor (GR)-mediated responses, including activation through classical GRE, synergistic effects on AP-1 and Pbx1/HOXB1 elements, gene repression through negative GRE, and NF-κB crosstalk. This requires the GR ligand-binding domain and a GR–RIP140 interaction demonstrated by GST pull-down. Overexpression of coactivator TIF2 partially overcomes RIP140 repression through competition for GR binding.","method":"GST pull-down, transient transfection reporter assays, competitive overexpression","journal":"The Journal of biological chemistry","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — GST pulldown plus multiple functional reporter assays in single lab","pmids":["10364267"],"is_preprint":false},{"year":2000,"finding":"LXXLL core motif sequences (8-amino-acid cores) in RIP140 mediate ligand-dependent binding to nuclear receptor ligand-binding domains; variant residues at positions -1 and +2 relative to the first conserved leucine influence affinity and selectivity for steroid and retinoid receptors, as demonstrated by peptide inhibition assays and yeast two-hybrid assays with defined point mutations.","method":"Peptide inhibition assay, yeast two-hybrid with mutant LXXLL core motifs","journal":"The Journal of biological chemistry","confidence":"High","confidence_rationale":"Tier 1 / Moderate — in vitro biochemical assay with mutagenesis plus yeast two-hybrid validation","pmids":["11078741"],"is_preprint":false},{"year":2001,"finding":"CtBP interacts with RIP140 in vitro and in vivo through the sequence PIDLSCK in the N-terminal third of RIP140. Acetylation of the lysine residue in this motif by p300/CBP dramatically reduces CtBP binding. Mutation of this lysine to glutamine decreases CtBP binding in vivo and abolishes transcriptional repression, revealing that p300/CBP-mediated acetylation disrupts the RIP140–CtBP complex and derepresses nuclear hormone receptor-regulated genes.","method":"In vitro binding, co-immunoprecipitation, acetylation-specific antibody, site-directed mutagenesis, reporter gene assay","journal":"Molecular and cellular biology","confidence":"High","confidence_rationale":"Tier 1 / Strong — in vitro and in vivo interaction, mutagenesis, modification-specific antibody, functional assay","pmids":["11509661"],"is_preprint":false},{"year":2001,"finding":"RIP140 interacts with retinoic acid receptor/RXR in a ligand-dependent manner through a novel C-terminal motif (LTKTNPILYYMLQK). RA induces co-immunoprecipitation of HDAC3 with RAR/RXR only in the presence of wild-type RIP140 (not C-terminal motif-deleted RIP140), and this is associated with decreased histone acetylation on RA response element-containing promoters.","method":"Domain mapping/mutagenesis, co-immunoprecipitation, chromatin immunoprecipitation (histone acetylation)","journal":"The Journal of biological chemistry","confidence":"High","confidence_rationale":"Tier 1–2 / Moderate — mutagenesis + Co-IP + ChIP in single lab with multiple orthogonal methods","pmids":["11278635"],"is_preprint":false},{"year":2001,"finding":"14-3-3 proteins interact with the nuclear receptor corepressor RIP140. In transfection assays, 14-3-3 enhances GR transactivation while RIP140 antagonizes this effect. Co-localization studies show that 14-3-3 can export RIP140 out of the nucleus and alter its intranuclear localization, providing a mechanism for enhanced glucocorticoid responsiveness via nuclear depletion of this corepressor.","method":"Co-immunoprecipitation, co-localization imaging, transfection reporter assays","journal":"Molecular endocrinology","confidence":"Medium","confidence_rationale":"Tier 2–3 / Moderate — Co-IP plus imaging plus functional assay in single lab","pmids":["11266503"],"is_preprint":false},{"year":2003,"finding":"In the absence of ligand-activated GR, RIP140 is localized in small nuclear foci targeted by a 40-amino-acid sequence. The focus-targeting domain overlaps with a CtBP-binding sequence but CtBP interaction is not required for focus localization. Upon GR ligand binding, RIP140 is redistributed to large nuclear domains, requiring RIP140 corepressor-activity regions and the GR DNA-binding domain. Full corepressor activity requires both C-terminal receptor-binding LXXLL motifs and CtBP interaction.","method":"Immunofluorescence/subcellular localization, domain-deletion analysis, co-localization with GR and SMRT, mutant functional assays","journal":"Molecular and cellular biology","confidence":"High","confidence_rationale":"Tier 2 / Moderate — direct localization experiments with domain-deletion mutagenesis and functional consequence established","pmids":["12773562"],"is_preprint":false},{"year":2004,"finding":"Mice devoid of RIP140 are lean, resist high-fat diet-induced obesity and hepatic steatosis, and have increased oxygen consumption. RIP140 absence leads to markedly increased UCP1 expression in white adipose tissue and reduced expression of certain lipogenic enzymes, establishing RIP140 as a ligand-dependent transcriptional repressor essential for maintaining energy storage vs. expenditure balance in adipose tissue.","method":"RIP140 knockout mouse model, gene expression analysis, metabolic phenotyping","journal":"PNAS","confidence":"High","confidence_rationale":"Tier 2 / Strong — clean KO with defined metabolic phenotype, replicated in subsequent studies","pmids":["15155905"],"is_preprint":false},{"year":2000,"finding":"Nrip1 (RIP140) null female mice are infertile due to complete failure of mature follicles to release the oocyte at ovulation, while luteinization proceeds normally. This establishes a specific requirement for the corepressor activity of RIP140 in coordinating ovarian function for oocyte release.","method":"Nrip1 knockout mouse model, histological analysis of ovarian phenotype","journal":"Nature medicine","confidence":"High","confidence_rationale":"Tier 2 / Strong — clean KO with specific defined phenotype, replicated by multiple subsequent studies","pmids":["11100122"],"is_preprint":false},{"year":2005,"finding":"RIP140 depletion by siRNA in 3T3-L1 adipocytes upregulates clusters of genes in glucose uptake, glycolysis, TCA cycle, fatty acid oxidation, mitochondrial biogenesis, and oxidative phosphorylation. Re-expression of RIP140 in RIP140-null MEFs downregulates these same genes. RIP140 mechanistically requires nuclear receptor ERRα to regulate hexose uptake and mitochondrial proteins SDHB and CoxVb. RIP140-null mice show enhanced glucose tolerance and insulin responsiveness.","method":"siRNA knockdown, Affymetrix microarray, metabolic assays ([14C]glucose oxidation, mitochondrial O2 consumption), RIP140 re-expression in null MEFs, mouse phenotyping","journal":"The Journal of clinical investigation","confidence":"High","confidence_rationale":"Tier 2 / Strong — multiple orthogonal methods (siRNA, rescue, metabolic assays, in vivo), replicated across labs","pmids":["16374519"],"is_preprint":false},{"year":2005,"finding":"MAPK-mediated phosphorylation of RIP140 at Thr202 and Thr207 (in the N-terminal repression domain) enhances its co-repressive activity through increased recruitment of histone deacetylases (HDACs). Phospho-mimetic mutations at these residues convert RIP140 to a more potent repressor resistant to MAPK inhibitor, while dephosphorylation-mimetic mutations impair HDAC recruitment and repressive activity.","method":"Mass spectrometry phosphosite identification, site-directed mutagenesis, HDAC co-immunoprecipitation, reporter gene assays, MAPK inhibitor treatment","journal":"Molecular & cellular proteomics","confidence":"High","confidence_rationale":"Tier 1 / Moderate — MS site identification combined with mutagenesis and functional co-repressor assays in single lab","pmids":["16093479"],"is_preprint":false},{"year":2007,"finding":"RIP140 is expressed in a fiber type-specific manner in skeletal muscle. Low RIP140 promotes while increased expression suppresses formation of oxidative fibers. Genes involved in fatty-acid oxidation, oxidative phosphorylation, and mitochondrial biogenesis are upregulated in RIP140-null muscle. Changes in gene expression are intrinsic to muscle cells and nuclear receptor-regulated genes are direct targets for repression by RIP140.","method":"RIP140 null, heterozygous, and transgenic mouse models, gene expression profiling, cultured myofiber analysis","journal":"Cell metabolism","confidence":"High","confidence_rationale":"Tier 2 / Strong — multiple genetic models (KO, het, transgenic) with gene expression and cellular phenotype","pmids":["17767910"],"is_preprint":false},{"year":2007,"finding":"RIP140 directly interacts with PGC-1α and suppresses its transcriptional activity. Both proteins regulate CIDEA expression via estrogen-related receptor alpha and NRF-1 binding sites on the CIDEA promoter. RIP140 represses while PGC-1α induces CIDEA expression, providing a direct antagonism between corepressor and coactivator via a nuclear receptor-dependent and -independent pathway.","method":"Co-immunoprecipitation (RIP140–PGC-1α direct interaction), promoter luciferase assays, chromatin immunoprecipitation, expression analysis in brown adipocytes","journal":"Molecular and cellular biology","confidence":"High","confidence_rationale":"Tier 2 / Moderate — direct Co-IP interaction, ChIP, functional reporter assays in single lab with multiple orthogonal methods","pmids":["18794372"],"is_preprint":false},{"year":2007,"finding":"RIP140 is essential for both DNA and histone methylation to maintain repression of the Ucp1 gene in white adipocytes. RIP140 promotes assembly of DNA methyltransferases and histone methyltransferases (HMTs) on the Ucp1 enhancer, leading to methylation of specific CpG residues and histones (evidenced by bisulfite genomic sequencing and ChIP), functioning as a scaffold for epigenetic repression machinery.","method":"Bisulfite genomic sequencing, chromatin immunoprecipitation, RIP140 null vs. wild-type adipocyte comparison","journal":"The EMBO journal","confidence":"High","confidence_rationale":"Tier 2 / Moderate — ChIP and bisulfite sequencing with KO comparison, multiple orthogonal epigenetic methods","pmids":["17972916"],"is_preprint":false},{"year":2007,"finding":"Pyridoxal 5'-phosphate (PLP, active form of vitamin B6) conjugates RIP140 at Lys613 (mapped by LC-ESI-MS/MS). This modification enhances RIP140 transcriptional corepressive activity and promotes its nuclear retention, attributed to increased interaction of PLP-modified RIP140 with histone deacetylases.","method":"LC-ESI-MS/MS modification site mapping, co-immunoprecipitation (HDAC interaction), reporter assays, adipocyte differentiation assay","journal":"Nature chemical biology","confidence":"High","confidence_rationale":"Tier 1 / Moderate — MS-based site identification plus functional assays and HDAC Co-IP in single lab","pmids":["17277785"],"is_preprint":false},{"year":2008,"finding":"PKCε phosphorylates RIP140 at Ser-102 and Ser-1003, which synergistically stimulates 14-3-3 binding; 14-3-3 then recruits protein arginine methyltransferase 1 (PRMT1) to methylate RIP140 arginine residues. Methylated RIP140 preferentially recruits exportin 1 (CRM1) for nuclear export, reducing nuclear gene-repressive activity. Phosphorylation-deficient RIP140 rescues fat accumulation defects in RIP140-null adipocytes more effectively than phospho-mimetic, cytoplasm-localizing RIP140.","method":"Site-directed mutagenesis, co-immunoprecipitation (PKCε, 14-3-3, PRMT1, exportin 1), subcellular fractionation, rescue experiments in null adipocytes","journal":"PloS one","confidence":"High","confidence_rationale":"Tier 2 / Moderate — cascade of Co-IPs with mutagenesis and functional rescue in single lab with multiple orthogonal methods","pmids":["18628823"],"is_preprint":false},{"year":2008,"finding":"SUMOylation of RIP140 at two conserved lysines (Lys756 in RD3 and Lys1154 in RD4) modulates its transcriptional repressor function. SUMO-1 is more efficiently conjugated than SUMO-2/3. Mutation of these SUMOylation sites compromises RIP140 corepressor activity, blunts repression of ERα-dependent transcription, and alters subnuclear distribution of RIP140.","method":"In vivo SUMOylation assay, site-directed mutagenesis (Lys756/1154), reporter gene assays, immunofluorescence localization","journal":"The Journal of biological chemistry","confidence":"High","confidence_rationale":"Tier 1–2 / Moderate — site-specific mutagenesis combined with functional repression and localization assays","pmids":["18211901"],"is_preprint":false},{"year":2008,"finding":"p300 is the specific lysine acetyltransferase and Erk2 the specific kinase for RIP140 in adipocytes. Erk2 phosphorylates Thr202/Thr207, which recruits p300 for lysine acetylation of Lys158/Lys287. This phosphorylation→acetylation cascade enhances RIP140 gene-repressive activity. Acetylation-deficient RIP140 fails to rescue fat accumulation defects in RIP140-null cultures whereas phospho-mimetic RIP140 can.","method":"In vivo kinase/acetyltransferase identification, site-directed mutagenesis, co-immunoprecipitation, adipocyte rescue experiments","journal":"Cellular signalling","confidence":"High","confidence_rationale":"Tier 1–2 / Moderate — Co-IP identification of enzymes plus mutagenesis and functional rescue with multiple orthogonal methods","pmids":["18655826"],"is_preprint":false},{"year":2009,"finding":"Cytoplasmic RIP140 (exported following PKCε phosphorylation and arginine methylation) interacts with Akt substrate AS160 and impedes Akt-mediated phosphorylation of AS160, thereby reducing GLUT4 trafficking and glucose uptake in adipocytes. This pathway is activated in epididymal adipocytes of diet-induced obese mice where nuclear PKCε is activated and cytoplasmic RIP140 is elevated.","method":"Co-immunoprecipitation (RIP140–AS160), subcellular fractionation, GLUT4 trafficking assay, glucose uptake assay, diet-induced obesity mouse model","journal":"Cell metabolism","confidence":"High","confidence_rationale":"Tier 2 / Strong — direct Co-IP with functional GLUT4/glucose assays replicated in vivo in mouse model","pmids":["19945409"],"is_preprint":false},{"year":2009,"finding":"During T3-mediated repression of Crabp1 gene in differentiating adipocytes, RIP140 is required for the repression. RIP140 replaces coactivators GRIP1 and PCAF on the basal promoter and forms a repressive complex with CtBP1, HDAC3, and histone methyltransferase G9a. This is associated with loss of active chromatin marks (H3-Ac, H3K4-me3) and gain of repressive marks (H3K9-me3, H3K27-me3) and recruitment of HP1α, HP1γ, and H1 to the promoter.","method":"Chromatin immunoprecipitation, bisulfite sequencing, co-immunoprecipitation, gene expression analysis in differentiating 3T3-L1 cells","journal":"Nucleic acids research","confidence":"High","confidence_rationale":"Tier 2 / Moderate — ChIP profiling combined with Co-IP and functional gene expression assays in single lab","pmids":["19778926"],"is_preprint":false},{"year":2011,"finding":"Cytoplasmic RIP140 directly interacts with perilipin on lipid droplets in adipocytes (triggered by elevated diacylglycerol). This interaction facilitates perilipin's recruitment of hormone-sensitive lipase (HSL) to lipid droplets and promotes ATGL/CGI-58 complex formation, ultimately enhancing lipolysis. Blocking cytoplasmic RIP140 accumulation reduces basal and isoproterenol-stimulated lipolysis.","method":"Co-immunoprecipitation (RIP140–perilipin, perilipin–HSL, ATGL–CGI-58), lipid droplet fractionation, lipolysis assay, siRNA knockdown","journal":"Cellular signalling","confidence":"High","confidence_rationale":"Tier 2 / Moderate — direct Co-IP with functional lipolysis assays and knockdown in single lab with multiple orthogonal methods","pmids":["21504789"],"is_preprint":false},{"year":2011,"finding":"Cytoplasmic RIP140 regulates adiponectin secretion via interaction with AS160 without affecting adiponectin production or oligomerization. Knockdown of RIP140 or its nuclear export trigger PKCε promotes adiponectin secretion and consequently enhances glucose uptake in C2C12 cells and reduces gluconeogenesis in HepG2 cells.","method":"Co-immunoprecipitation (RIP140–AS160), ELISA (adiponectin secretion), siRNA knockdown, conditioned media experiments, neutralizing antibody","journal":"Cellular signalling","confidence":"Medium","confidence_rationale":"Tier 2–3 / Moderate — Co-IP plus functional secretion and downstream metabolic assays in single lab","pmids":["21872658"],"is_preprint":false},{"year":2012,"finding":"LPS stimulates Syk kinase-mediated tyrosine phosphorylation of RIP140, which promotes interaction of NF-κB subunit RelA with RIP140, leading to recruitment of E3 ligase SCF complex that degrades RIP140 to inactivate proinflammatory cytokine genes. Macrophages expressing non-degradable RIP140 resist establishment of endotoxin tolerance for specific tolerizable genes, identifying RelA as an adaptor for SCF-mediated RIP140 degradation.","method":"Co-immunoprecipitation (RIP140–RelA, RIP140–SCF), phospho-tyrosine detection, non-degradable RIP140 mutant macrophages, LPS tolerance assays","journal":"Nature immunology","confidence":"High","confidence_rationale":"Tier 2 / Moderate — multiple Co-IPs with defined mutant and functional endotoxin tolerance assays in single lab","pmids":["22388040"],"is_preprint":false},{"year":2010,"finding":"RIP140 represses E2F1 transactivation on various E2F target promoters and inhibits expression of E2F1 target genes (e.g., CCNE1, CCNB2). Physical interaction between RIP140 and E2F1 was demonstrated by GST pull-down and co-immunoprecipitation. Increasing RIP140 levels reduces the proportion of cells in S phase in human cell lines.","method":"GST pull-down, co-immunoprecipitation, ChIP, transfection reporter assays, FACS cell cycle analysis","journal":"Clinical cancer research","confidence":"High","confidence_rationale":"Tier 2 / Moderate — reciprocal Co-IP plus ChIP and functional cell cycle assay in single lab","pmids":["20410059"],"is_preprint":false},{"year":2014,"finding":"RIP140 ChIP-seq reveals that it shares >80% of binding sites with ERα, co-localizing with FOXA1, GATA3, p300, CBP, and p160 family members at H3K4me1-demarcated enhancer regions. RIP140 is required for ERα complex formation and ERα-mediated gene expression and ERα-dependent breast cancer cell proliferation.","method":"ChIP-seq (RIP140, ERα), siRNA knockdown, gene expression analysis, cell proliferation assay","journal":"Cancer research","confidence":"High","confidence_rationale":"Tier 2 / Moderate — genome-wide ChIP-seq plus functional KD with defined cellular phenotype in single lab","pmids":["25145671"],"is_preprint":false},{"year":2014,"finding":"RIP140 inhibits intestinal epithelial cell proliferation and promotes APC transcription, inhibiting β-catenin activation and target gene expression. RIP140 overexpression strongly represses colon cancer cell proliferation in vitro and in vivo. In murine tissues and human cancer cells, RIP140 stimulates APC transcription.","method":"Rip140-null mice, RIP140 overexpressing transgenic mice, xenograft tumor model, gene expression analysis, reporter assays","journal":"The Journal of clinical investigation","confidence":"High","confidence_rationale":"Tier 2 / Strong — multiple genetic mouse models plus in vitro and in vivo functional assays","pmids":["24667635"],"is_preprint":false},{"year":2014,"finding":"RIP140 in adipocyte chromatin remodeling requires its lysine acetylation for recruiting Brm (SWI/SNF ATPase subunit). RA-induced coordinated repressive chromatin-remodeling of Nanog and Oct4 gene loci in embryonic stem cells requires RAR-α, RIP140, and Brm.","method":"Chromatin immunoprecipitation, nucleosome positioning assay, RIP140 acetylation mutant, co-immunoprecipitation with Brm","journal":"Nucleic acids research","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — ChIP with acetylation mutagenesis, single lab","pmids":["24489122"],"is_preprint":false},{"year":2014,"finding":"RIP140 reduces expression of reverse cholesterol transport genes ABCA1 and ABCG1 in macrophages, enhancing foam cell formation. In macrophage-specific RIP140 knockdown crossed with ApoE null mice, high-cholesterol diet-induced atherosclerosis is significantly ameliorated.","method":"Gene expression analysis, macrophage-specific RIP140 knockdown transgenic mouse, ApoE null atherosclerosis model, lipid accumulation assay","journal":"Journal of molecular and cellular cardiology","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — in vivo mouse model with gene expression data, single lab","pmids":["25528964"],"is_preprint":false},{"year":2017,"finding":"RIP140 in osteoclast precursors inhibits osteoclast differentiation by forming a transcription-suppressor complex with testicular receptor 4 (TR4) to repress osteoclastogenic genes. Syk-stimulated RIP140 protein degradation terminates this suppressive activity. Monocyte/macrophage-specific RIP140 knockdown results in increased bone resorption and reduced bone formation.","method":"Co-immunoprecipitation (RIP140–TR4), macrophage-specific RIP140 KD mice, bone histomorphometry, Syk-mediated degradation assay, osteoclast differentiation assay","journal":"JCI insight","confidence":"High","confidence_rationale":"Tier 2 / Moderate — Co-IP interaction plus in vivo mouse model and defined mechanistic pathway in single lab","pmids":["28405613"],"is_preprint":false},{"year":2018,"finding":"Glyburide stimulates Ca2+/calmodulin-dependent protein kinase II (CaMKII) activation, which triggers specific ubiquitination of RIP140, leading to its degradation. This RIP140 degradation enhances M2 macrophage polarization and anti-inflammatory response.","method":"CaMKII activation assay, ubiquitination assay, RIP140 degradation measurement, macrophage polarization assay, wound healing model","journal":"Scientific reports","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — direct mechanistic assays for ubiquitination and degradation plus functional polarization assays, single lab","pmids":["29339732"],"is_preprint":false},{"year":2023,"finding":"RIP140 (encoded by Nrip1) suppresses a transcriptional regulatory network controlling cardiac fuel metabolism and contractile function. Striated muscle-specific RIP140 deficiency increases expression of genes involved in mitochondrial energy metabolism and contractile function. Cardiac-specific RIP140 deficiency protects against heart failure from pressure overload combined with myocardial infarction. Genomic enhancers activated by RIP140 deficiency are enriched for ERR and MEF2 binding motifs. Loss of RIP140 in heart augments triacylglyceride turnover and fatty acid utilization.","method":"Striated muscle-specific and cardiac-specific Nrip1 knockout mice, pressure overload + MI heart failure model, RNA-seq, ChIP-seq, metabolic flux assays","journal":"The Journal of clinical investigation","confidence":"High","confidence_rationale":"Tier 2 / Moderate — tissue-specific KO models with disease phenotype, genomics, and metabolic assays in single rigorous study","pmids":["36927960"],"is_preprint":false},{"year":2011,"finding":"RIP140 null soleus muscle shows increased GLUT4 trafficking and glucose uptake with no change in Akt activity, but with increased AMPK phosphorylation/activity and elevated UCP1 expression and mitochondrial uncoupling, revealing a pathway controlling insulin-independent glucose uptake through UCP1-mediated AMPK activation. RIP140 transgenic soleus shows reduced AMPK phosphorylation/activity.","method":"RIP140 null and transgenic mouse models, GLUT4 trafficking assay, glucose uptake assay, AMPK phosphorylation measurement, UCP1 expression, mitochondrial uncoupling assay","journal":"PloS one","confidence":"High","confidence_rationale":"Tier 2 / Moderate — complementary KO and transgenic models with multiple biochemical readouts in single lab","pmids":["22389706"],"is_preprint":false},{"year":2016,"finding":"RIP140 interacts with DNMT3b in macrophages (shown by co-immunoprecipitation). LPS stimulation increases PPARγ promoter methylation and inhibits its transcriptional activity; RIP140 knockdown reduces DNMT3b-mediated PPARγ promoter methylation and restores PPARγ activity.","method":"Co-immunoprecipitation (RIP140–DNMT3b), bisulfite pyrosequencing, PPARγ promoter methylation and activity assays, siRNA knockdown in RAW264.7 cells","journal":"Pulmonary pharmacology & therapeutics","confidence":"Medium","confidence_rationale":"Tier 2–3 / Moderate — Co-IP plus bisulfite sequencing and functional assays in single lab","pmids":["26921464"],"is_preprint":false},{"year":2022,"finding":"RIP140 reduces transcription of the glucose transporter GLUT3 gene by inhibiting the transcriptional activity of HIF-2α in cooperation with p53, thereby suppressing glycolysis-dependent breast cancer cell proliferation.","method":"Cell proliferation assays, metabolic assays, reporter gene assays, siRNA knockdown, RIP140 overexpression, co-immunoprecipitation/interaction with HIF-2α and p53","journal":"Cellular and molecular life sciences","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — functional reporter and metabolic assays with defined transcription factor interplay, single lab","pmids":["35501580"],"is_preprint":false},{"year":2003,"finding":"RIP140 interacts with steroidogenic factor 1 (SF-1) through its AF-2 domain; the C-terminal region of RIP140 containing 4 LXXLL motifs shows the strongest interaction. RIP140 acts as a potent corepressor of SF-1-dependent transcription from the CYP17 CRS2 element and counteracts SRC/p160 coactivators. The inhibitory effect is partially reversed by trichostatin A, indicating HDAC involvement.","method":"GST pull-down, domain mapping, reporter gene assays in multiple cell types, trichostatin A treatment","journal":"Molecular and cellular endocrinology","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — direct pulldown with domain mapping and functional reporter assays in single lab","pmids":["12782406"],"is_preprint":false},{"year":2013,"finding":"RIP140 is required in both mammary epithelial and stromal compartments for ductal elongation during puberty and acts as a co-regulator with ERα to directly regulate expression of amphiregulin (Areg), the progesterone receptor (Pgr), and Stat5a, based on genome-wide ERα ChIP-seq and selective ChIP verification of RIP140 co-occupancy.","method":"RIP140-null and transgenic mouse models, tissue recombination experiments, ChIP-seq (ERα), ChIP (RIP140 co-occupancy), gene expression analysis","journal":"Development","confidence":"High","confidence_rationale":"Tier 2 / Moderate — in vivo genetic models plus ChIP-seq/ChIP and defined target genes in single rigorous study","pmids":["23404106"],"is_preprint":false}],"current_model":"NRIP1/RIP140 is a ligand-dependent transcriptional corepressor that is recruited via LXXLL motifs and a C-terminal receptor-interacting motif to the AF-2 domains of nuclear receptors (ER, TR, RAR/RXR, PPARs, GR, SF-1, ERR, TR2, AhR, and others), where it competes with coactivators (SRC-1, PGC-1α, PCAF) and actively represses transcription by scaffolding HDAC, CtBP, DNMT, and histone methyltransferase complexes; its activity is fine-tuned by a cascade of post-translational modifications (MAPK/Erk2 phosphorylation → p300 lysine acetylation; PKCε phosphorylation → 14-3-3 binding → PRMT1 arginine methylation → CRM1-dependent nuclear export; SUMOylation; PLP conjugation; Syk/CaMKII-triggered ubiquitination and degradation), which control its nuclear vs. cytoplasmic distribution and corepressor potency; in the cytoplasm, RIP140 additionally suppresses insulin signaling and GLUT4 trafficking by binding AS160, enhances lipolysis through perilipin interaction, and modulates adiponectin secretion, while in vivo loss-of-function establishes essential roles in female ovulation, adipose energy expenditure, skeletal muscle oxidative metabolism, cardiac fuel metabolism, intestinal homeostasis, macrophage polarization, and osteoclast differentiation."},"narrative":{"mechanistic_narrative":"NRIP1 (RIP140) is a ligand-dependent transcriptional corepressor that is recruited to the AF-2 domains of nuclear receptors and orchestrates active gene silencing of metabolic and developmental programs [PMID:7641693, PMID:15155905]. It binds the ligand-activated estrogen receptor and a broad panel of nuclear receptors (TR, RAR/RXR, PPAR/RXR, GR, SF-1, TR2, AhR) through multiple LXXLL core motifs and an additional C-terminal receptor-interacting motif, and it competes directly with p160/SRC coactivators for the receptor AF-2 surface [PMID:8887632, PMID:9626662, PMID:11078741, PMID:11278635, PMID:12782406]. Although named as a corepressor, on the estrogen receptor it co-occupies enhancers genome-wide with ERα, FOXA1, GATA3 and p300/CBP and is required for ERα complex assembly and ERα-driven transcription and proliferation [PMID:25145671, PMID:23404106]. Repression is executed by scaffolding chromatin-modifying machinery: RIP140 assembles CtBP, HDAC3, the histone methyltransferase G9a, DNA methyltransferases and the SWI/SNF ATPase Brm onto target promoters, replacing coactivators and converting chromatin from active to repressive marks [PMID:11509661, PMID:11278635, PMID:17972916, PMID:19778926, PMID:24489122, PMID:26921464]. Its corepressor potency and nucleocytoplasmic distribution are governed by a layered post-translational code—MAPK/Erk2 phosphorylation triggering p300 acetylation and enhanced HDAC recruitment, PKCε phosphorylation driving 14-3-3 binding, PRMT1 arginine methylation and CRM1-dependent nuclear export, plus SUMOylation, PLP conjugation and signal-induced ubiquitin-dependent degradation [PMID:11509661, PMID:16093479, PMID:17277785, PMID:18628823, PMID:18211901, PMID:18655826, PMID:22388040, PMID:29339732]. In the cytoplasm RIP140 acquires distinct functions, binding AS160 to suppress GLUT4 trafficking and adiponectin secretion and binding perilipin to promote lipolysis [PMID:19945409, PMID:21504789, PMID:21872658]. Through these activities RIP140 is a master repressor of oxidative and energy-expenditure gene networks: its loss in mice produces a lean, energy-expending phenotype with derepressed UCP1, mitochondrial biogenesis and fatty-acid oxidation genes in adipose, skeletal muscle and heart, while it is also essential for ovulation, restrains intestinal and breast cancer cell proliferation, and tunes macrophage polarization and osteoclast differentiation [PMID:15155905, PMID:11100122, PMID:16374519, PMID:17767910, PMID:36927960, PMID:24667635, PMID:25145671, PMID:28405613].","teleology":[{"year":1995,"claim":"Established that NRIP1 is a genuine, ligand-regulated interaction partner of the estrogen receptor, defining it as a candidate nuclear receptor cofactor.","evidence":"In vitro binding, co-immunoprecipitation in cells, and reporter assays with the ER AF-2 domain","pmids":["7641693"],"confidence":"High","gaps":["Did not resolve whether NRIP1 activates or represses transcription","Binding interface and motifs not yet mapped"]},{"year":1996,"claim":"Mapped two independent receptor-binding sites and showed NRIP1 can bridge receptors to transcriptional machinery, beginning to define its cofactor architecture across multiple nuclear receptors.","evidence":"In vitro pulldown domain mapping plus GAL4-fusion reporter assays in yeast and mammalian cells","pmids":["8887632"],"confidence":"High","gaps":["Direction of transcriptional effect on physiological receptors unsettled","Identity of recruited machinery unknown"]},{"year":2000,"claim":"Defined NRIP1 as a corepressor that competes with SRC-1 coactivators for nuclear receptor AF-2, and that LXXLL core variants tune receptor affinity and selectivity.","evidence":"GST-pulldown, yeast two-hybrid, competitive binding and peptide inhibition assays on PPAR/RXR and steroid/retinoid receptors","pmids":["9626662","11078741"],"confidence":"High","gaps":["Repressive effector complexes not identified","In vivo relevance not established"]},{"year":2000,"claim":"Provided the first in vivo demonstration of an essential, non-redundant physiological role, anchoring NRIP1 corepressor function in ovulation.","evidence":"Nrip1 knockout mice with histological ovarian analysis showing oocyte-release failure","pmids":["11100122"],"confidence":"High","gaps":["Molecular targets driving the ovulation defect not defined","Which receptor pathway is dysregulated unclear"]},{"year":2001,"claim":"Identified the effector complexes through which NRIP1 represses, showing it recruits CtBP and HDAC3 to nuclear receptor target promoters to reduce histone acetylation.","evidence":"In vitro binding, Co-IP, ChIP for histone acetylation, and motif-deletion mutants on RAR/RXR and CtBP-binding sequences","pmids":["11509661","11278635"],"confidence":"High","gaps":["Full repertoire of recruited chromatin modifiers incomplete","Regulation of complex assembly not yet defined"]},{"year":2003,"claim":"Defined NRIP1 subnuclear targeting and showed repression requires both LXXLL receptor binding and CtBP interaction, integrating localization with corepressor potency.","evidence":"Immunofluorescence, domain-deletion analysis and co-localization with GR/SMRT, plus extension of corepressor activity to SF-1","pmids":["12773562","12782406"],"confidence":"Medium","gaps":["Signals controlling focus-to-domain redistribution not fully resolved","SF-1 finding limited to reporter systems"]},{"year":2004,"claim":"Established NRIP1 as a physiological brake on adipose energy expenditure, linking its corepressor activity to whole-body metabolism.","evidence":"RIP140 knockout mice with metabolic phenotyping showing leanness, obesity resistance and derepressed UCP1","pmids":["15155905"],"confidence":"High","gaps":["Direct target genes and responsible nuclear receptor not yet pinned","Tissue autonomy unresolved at this stage"]},{"year":2007,"claim":"Defined the gene networks and partner receptors/coactivators through which NRIP1 controls oxidative metabolism, identifying ERRα dependence and direct PGC-1α antagonism.","evidence":"siRNA, microarray, rescue in null MEFs, metabolic assays, fiber-type-specific muscle genetics, and Co-IP/ChIP on CIDEA","pmids":["16374519","17767910","18794372"],"confidence":"High","gaps":["Mechanism of coactivator-corepressor switching at single loci not fully resolved","Stoichiometry of PGC-1α antagonism unknown"]},{"year":2007,"claim":"Showed NRIP1 acts as a scaffold for both DNA and histone methylation machinery, extending its repressive output to heritable epigenetic silencing of metabolic genes.","evidence":"Bisulfite sequencing and ChIP at the Ucp1 enhancer in null vs. wild-type adipocytes; LC-MS/MS mapping of PLP conjugation enhancing HDAC interaction","pmids":["17972916","17277785"],"confidence":"High","gaps":["Recruitment order of DNMT/HMT complexes not defined","Which signals trigger PLP conjugation in vivo unknown"]},{"year":2008,"claim":"Defined a multi-layered post-translational code (phosphorylation→acetylation, SUMOylation) that tunes NRIP1 corepressor potency and its nuclear export.","evidence":"MS phosphosite mapping, kinase/acetyltransferase identification (Erk2/p300), PKCε–14-3-3–PRMT1–CRM1 cascade Co-IPs, SUMO mutagenesis and rescue in null adipocytes","pmids":["16093479","18211901","18628823","18655826"],"confidence":"High","gaps":["Quantitative contribution of each modification in vivo unresolved","Crosstalk hierarchy among modifications partially defined"]},{"year":2009,"claim":"Discovered a distinct cytoplasmic, non-genomic role for NRIP1 in suppressing insulin-stimulated glucose uptake, mechanistically linking nuclear export to metabolic signaling.","evidence":"Co-IP with AS160, subcellular fractionation, GLUT4 trafficking and glucose uptake assays, and diet-induced obesity mouse model","pmids":["19945409","19778926"],"confidence":"High","gaps":["How cytoplasmic NRIP1 selects AS160 over other substrates unclear","Reversibility of cytoplasmic accumulation in vivo not defined"]},{"year":2011,"claim":"Broadened cytoplasmic NRIP1 functions to lipid droplet biology and adiponectin secretion, and connected its muscle metabolic action to AMPK-mediated insulin-independent glucose uptake.","evidence":"Co-IP with perilipin, lipolysis assays, adiponectin ELISA, and null/transgenic soleus muscle with AMPK and UCP1 readouts","pmids":["21504789","21872658","22389706"],"confidence":"High","gaps":["Adiponectin secretion finding is Medium-confidence and single-lab","Switch between lipolytic and anti-lipogenic roles not fully integrated"]},{"year":2012,"claim":"Established signal-induced degradation as a mechanism terminating NRIP1 repression, integrating it into inflammatory and immune gene control.","evidence":"Syk phosphorylation, RelA-adaptor Co-IPs, SCF E3 ligase recruitment, and non-degradable mutant macrophages in endotoxin tolerance assays","pmids":["22388040"],"confidence":"High","gaps":["Generality of degradation across tissues not established","Which tolerizable gene set is directly bound unclear"]},{"year":2014,"claim":"Repositioned NRIP1 in cancer biology, showing it is required for ERα enhancer complex formation in breast cancer yet suppresses Wnt/β-catenin-driven intestinal proliferation.","evidence":"ChIP-seq co-occupancy with ERα/FOXA1/p300, siRNA proliferation assays, and Rip140-null/transgenic mice with APC transcription and xenograft models","pmids":["25145671","24667635","24489122","20410059"],"confidence":"High","gaps":["Context determinants of coactivator vs. corepressor role on ERα unresolved","Direct vs. indirect control of APC transcription not fully dissected"]},{"year":2017,"claim":"Extended the corepressor mechanism to immune and skeletal homeostasis, defining a TR4-based suppressor complex and degradation-controlled macrophage/osteoclast programs.","evidence":"Co-IP with TR4, macrophage-specific knockdown mice, bone histomorphometry, and CaMKII/ubiquitination-driven degradation polarization assays","pmids":["28405613","29339732","26921464","25528964"],"confidence":"Medium","gaps":["Several findings (DNMT3b, atherosclerosis, M2 polarization) are Medium-confidence single-lab","Direct osteoclastogenic target genes incompletely mapped"]},{"year":2023,"claim":"Demonstrated that NRIP1 governs a cardiac fuel-metabolism and contractility transcriptional network, with loss conferring protection against heart failure.","evidence":"Striated-muscle- and cardiac-specific Nrip1 knockout mice, pressure-overload+MI heart failure model, RNA-seq/ChIP-seq, and metabolic flux assays implicating ERR and MEF2 enhancers","pmids":["36927960"],"confidence":"High","gaps":["Direct NRIP1-bound cardiac enhancers vs. indirect effects not fully separated","Therapeutic window of cardiac NRIP1 inhibition undefined"]},{"year":null,"claim":"It remains unresolved what determines NRIP1's context-dependent switch between corepressor, ERα-complex-assembly cofactor, and cytoplasmic signaling regulator, and how the post-translational code is integrated quantitatively in vivo.","evidence":"","pmids":[],"confidence":"Medium","gaps":["No structural model of full-length NRIP1 in receptor/chromatin complexes","Cell-type rules dictating activator vs. repressor behavior unknown","Human disease genetics not established in this corpus"]}],"mechanism_profile":{"molecular_activity":[{"term_id":"GO:0140110","term_label":"transcription regulator activity","supporting_discovery_ids":[0,2,11,15,16,28]},{"term_id":"GO:0098772","term_label":"molecular function regulator activity","supporting_discovery_ids":[2,16,22,24]},{"term_id":"GO:0060090","term_label":"molecular adaptor activity","supporting_discovery_ids":[7,8,17,23,30]},{"term_id":"GO:0042393","term_label":"histone binding","supporting_discovery_ids":[17,23]}],"localization":[{"term_id":"GO:0005634","term_label":"nucleus","supporting_discovery_ids":[0,3,10,20]},{"term_id":"GO:0005654","term_label":"nucleoplasm","supporting_discovery_ids":[10,17,23,28]},{"term_id":"GO:0005829","term_label":"cytosol","supporting_discovery_ids":[19,22,24]},{"term_id":"GO:0005811","term_label":"lipid droplet","supporting_discovery_ids":[24]}],"pathway":[{"term_id":"R-HSA-74160","term_label":"Gene expression (Transcription)","supporting_discovery_ids":[0,2,8,28]},{"term_id":"R-HSA-4839726","term_label":"Chromatin organization","supporting_discovery_ids":[17,23,30]},{"term_id":"R-HSA-1430728","term_label":"Metabolism","supporting_discovery_ids":[11,13,15,22,34]},{"term_id":"R-HSA-168256","term_label":"Immune System","supporting_discovery_ids":[26,33,36]},{"term_id":"R-HSA-162582","term_label":"Signal Transduction","supporting_discovery_ids":[22,24,25]}],"complexes":["RIP140-CtBP-HDAC3-G9a corepressor complex","ERα enhancer complex (with FOXA1/GATA3/p300/p160)","RIP140-TR4 osteoclast suppressor complex"],"partners":["ESR1","PGC-1Α","CTBP1","HDAC3","AS160","PERILIPIN","RELA","TR4"],"other_free_text":[]}},"prefetch_data":{"uniprot":{"accession":"P48552","full_name":"Nuclear receptor-interacting protein 1","aliases":["Nuclear factor RIP140","Receptor-interacting protein 140"],"length_aa":1158,"mass_kda":126.9,"function":"Modulates transcriptional activation by steroid receptors such as NR3C1, NR3C2 and ESR1. Also modulates transcriptional repression by nuclear hormone receptors. Positive regulator of the circadian clock gene expression: stimulates transcription of BMAL1, CLOCK and CRY1 by acting as a coactivator for RORA and RORC. Involved in the regulation of ovarian function (By similarity). Plays a role in renal development (PubMed:28381549)","subcellular_location":"Nucleus","url":"https://www.uniprot.org/uniprotkb/P48552/entry"},"depmap":{"release":"DepMap","has_data":true,"is_common_essential":false,"resolved_as":"","url":"https://depmap.org/portal/gene/NRIP1","classification":"Not Classified","n_dependent_lines":1,"n_total_lines":1208,"dependency_fraction":0.0008278145695364238},"opencell":{"profiled":false,"resolved_as":"","ensg_id":"","cell_line_id":"","localizations":[],"interactors":[{"gene":"VPS33A","stoichiometry":0.2},{"gene":"UPF1","stoichiometry":0.2}],"url":"https://opencell.sf.czbiohub.org/search/NRIP1","total_profiled":1310},"omim":[{"mim_id":"618270","title":"CONGENITAL ANOMALIES OF KIDNEY AND URINARY TRACT 3; CAKUT3","url":"https://www.omim.org/entry/618270"},{"mim_id":"617109","title":"CREB3 RECRUITMENT FACTOR; CREBRF","url":"https://www.omim.org/entry/617109"},{"mim_id":"610805","title":"CONGENITAL ANOMALIES OF KIDNEY AND URINARY TRACT 1; CAKUT1","url":"https://www.omim.org/entry/610805"},{"mim_id":"602490","title":"NUCLEAR RECEPTOR-INTERACTING PROTEIN 1; NRIP1","url":"https://www.omim.org/entry/602490"},{"mim_id":"601529","title":"NUCLEAR RECEPTOR SUBFAMILY 2, GROUP C, MEMBER 1; NR2C1","url":"https://www.omim.org/entry/601529"}],"hpa":{"profiled":true,"resolved_as":"","reliability":"Supported","locations":[{"location":"Nucleoplasm","reliability":"Supported"},{"location":"Nucleoli","reliability":"Supported"},{"location":"Cytosol","reliability":"Additional"}],"tissue_specificity":"Low tissue specificity","tissue_distribution":"Detected in all","driving_tissues":[],"url":"https://www.proteinatlas.org/search/NRIP1"},"hgnc":{"alias_symbol":["RIP140"],"prev_symbol":[]},"alphafold":{"accession":"P48552","domains":[],"viewer_url":"https://alphafold.ebi.ac.uk/entry/P48552","model_url":"https://alphafold.ebi.ac.uk/files/AF-P48552-F1-model_v6.cif","pae_url":"https://alphafold.ebi.ac.uk/files/AF-P48552-F1-predicted_aligned_error_v6.png","plddt_mean":45.91},"mouse_models":{"mgi_url":"https://www.informatics.jax.org/marker/summary?nomen=NRIP1","jax_strain_url":"https://www.jax.org/strain/search?query=NRIP1"},"sequence":{"accession":"P48552","fasta_url":"https://rest.uniprot.org/uniprotkb/P48552.fasta","uniprot_url":"https://www.uniprot.org/uniprotkb/P48552/entry","alphafold_viewer_url":"https://alphafold.ebi.ac.uk/entry/P48552"}},"corpus_meta":[{"pmid":"7641693","id":"PMC_7641693","title":"Nuclear factor RIP140 modulates transcriptional activation by the estrogen receptor.","date":"1995","source":"The EMBO journal","url":"https://pubmed.ncbi.nlm.nih.gov/7641693","citation_count":664,"is_preprint":false},{"pmid":"15155905","id":"PMC_15155905","title":"Nuclear receptor corepressor RIP140 regulates fat accumulation.","date":"2004","source":"Proceedings of the National Academy of Sciences of the United States of America","url":"https://pubmed.ncbi.nlm.nih.gov/15155905","citation_count":312,"is_preprint":false},{"pmid":"18267075","id":"PMC_18267075","title":"Chloroplastic protein NRIP1 mediates innate immune receptor recognition of a viral effector.","date":"2008","source":"Cell","url":"https://pubmed.ncbi.nlm.nih.gov/18267075","citation_count":289,"is_preprint":false},{"pmid":"16374519","id":"PMC_16374519","title":"Suppression of oxidative metabolism and mitochondrial biogenesis by the transcriptional corepressor RIP140 in mouse adipocytes.","date":"2005","source":"The Journal of clinical investigation","url":"https://pubmed.ncbi.nlm.nih.gov/16374519","citation_count":191,"is_preprint":false},{"pmid":"9626662","id":"PMC_9626662","title":"A regulatory role for RIP140 in nuclear receptor activation.","date":"1998","source":"Molecular endocrinology (Baltimore, Md.)","url":"https://pubmed.ncbi.nlm.nih.gov/9626662","citation_count":190,"is_preprint":false},{"pmid":"17767910","id":"PMC_17767910","title":"The transcriptional corepressor RIP140 regulates oxidative metabolism in skeletal muscle.","date":"2007","source":"Cell metabolism","url":"https://pubmed.ncbi.nlm.nih.gov/17767910","citation_count":164,"is_preprint":false},{"pmid":"11100122","id":"PMC_11100122","title":"The nuclear receptor co-repressor nrip1 (RIP140) is essential for female fertility.","date":"2000","source":"Nature medicine","url":"https://pubmed.ncbi.nlm.nih.gov/11100122","citation_count":153,"is_preprint":false},{"pmid":"18794372","id":"PMC_18794372","title":"A functional interaction between RIP140 and PGC-1alpha regulates the expression of the lipid droplet protein CIDEA.","date":"2008","source":"Molecular and cellular biology","url":"https://pubmed.ncbi.nlm.nih.gov/18794372","citation_count":136,"is_preprint":false},{"pmid":"11078741","id":"PMC_11078741","title":"Core LXXLL motif sequences in CREB-binding protein, SRC1, and RIP140 define affinity and selectivity for steroid and retinoid receptors.","date":"2000","source":"The Journal of biological chemistry","url":"https://pubmed.ncbi.nlm.nih.gov/11078741","citation_count":136,"is_preprint":false},{"pmid":"11509661","id":"PMC_11509661","title":"Acetylation of nuclear hormone receptor-interacting protein RIP140 regulates binding of the transcriptional corepressor CtBP.","date":"2001","source":"Molecular and cellular biology","url":"https://pubmed.ncbi.nlm.nih.gov/11509661","citation_count":126,"is_preprint":false},{"pmid":"10428779","id":"PMC_10428779","title":"Differential recruitment of coactivator RIP140 by Ah and estrogen receptors. 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RIP140 also co-immunoprecipitates with ER in intact cells and modulates ER transcriptional activity in the presence of estrogen.\",\n      \"method\": \"In vitro binding assay, co-immunoprecipitation in intact cells, transient transfection reporter assay\",\n      \"journal\": \"The EMBO journal\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — reciprocal Co-IP, in vitro binding, functional reporter assay, founding paper replicated widely\",\n      \"pmids\": [\"7641693\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 1996,\n      \"finding\": \"RIP140 contains two distinct binding sites (site 1 and site 2) that independently interact with the ligand-binding domain of the estrogen receptor both in solution and when the receptor is bound to DNA; both sites interact with thyroid hormone and retinoic acid receptors, while retinoid X receptor interaction is mediated primarily by site 1. When fused to heterologous DNA-binding domains, RIP140 stimulates transcription in yeast and mammalian cells, suggesting it bridges receptors to the basal transcription machinery.\",\n      \"method\": \"In vitro binding/pulldown mapping, reporter gene assays in yeast and mammalian cells\",\n      \"journal\": \"Molecular and cellular biology\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1–2 / Strong — in vitro domain mapping combined with functional transcription assays in two cell systems\",\n      \"pmids\": [\"8887632\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 1998,\n      \"finding\": \"RIP140 forms ternary complexes with PPAR/RXR heterodimers in the presence of RXR ligands, shows high affinity for the RXR subunit, and generally down-regulates nuclear receptor activity in mammalian cells. In vitro binding of RIP140 and SRC-1 to nuclear receptors is competitive, and RIP140 specifically down-regulates coactivation by SRC-1, suggesting it acts as an indirect inhibitor of AF-2 by competing with coactivators.\",\n      \"method\": \"GST-pulldown, yeast two-hybrid, mammalian cell co-transfection, competitive binding assay\",\n      \"journal\": \"Molecular endocrinology\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1–2 / Moderate — multiple orthogonal methods (pulldown, two-hybrid, functional assay) in single lab\",\n      \"pmids\": [\"9626662\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 1998,\n      \"finding\": \"RIP140 interacts with the ligand-binding domain of orphan receptor TR2 via LXXLL motifs; the TR2 AF-2 region mediates the interaction. RIP140 functions as a corepressor for TR2 and suppresses RA-receptor-mediated RA induction. Co-immunoprecipitation and GFP nuclear translocation experiments confirmed the RIP140–TR2 interaction in vivo.\",\n      \"method\": \"Yeast two-hybrid, domain mapping, GAL4 reporter, co-immunoprecipitation, GFP nuclear translocation\",\n      \"journal\": \"Molecular and cellular biology\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — reciprocal Co-IP, domain-mapping, functional reporter in single lab with multiple orthogonal approaches\",\n      \"pmids\": [\"9774688\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 1999,\n      \"finding\": \"RIP140 interacts with the aryl hydrocarbon receptor (AhR) but not with ARNT, both in vitro and in cells. The AhR interaction is mediated by its transactivation domain Q-rich subdomain, and the RIP140 interaction domain maps to residues 154–350, distinct from the ER-binding domain. LXXLL motifs are not required for RIP140 binding to AhR. RIP140 enhanced TCDD-mediated dioxin response element-driven reporter gene activity.\",\n      \"method\": \"Co-immunoprecipitation, co-localization assays, domain mapping, reporter gene assay in three cell lines\",\n      \"journal\": \"The Journal of biological chemistry\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — reciprocal Co-IP plus domain mapping and functional assay across multiple cell lines\",\n      \"pmids\": [\"10428779\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 1999,\n      \"finding\": \"RIP140 antagonizes all tested glucocorticoid receptor (GR)-mediated responses, including activation through classical GRE, synergistic effects on AP-1 and Pbx1/HOXB1 elements, gene repression through negative GRE, and NF-κB crosstalk. This requires the GR ligand-binding domain and a GR–RIP140 interaction demonstrated by GST pull-down. Overexpression of coactivator TIF2 partially overcomes RIP140 repression through competition for GR binding.\",\n      \"method\": \"GST pull-down, transient transfection reporter assays, competitive overexpression\",\n      \"journal\": \"The Journal of biological chemistry\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — GST pulldown plus multiple functional reporter assays in single lab\",\n      \"pmids\": [\"10364267\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2000,\n      \"finding\": \"LXXLL core motif sequences (8-amino-acid cores) in RIP140 mediate ligand-dependent binding to nuclear receptor ligand-binding domains; variant residues at positions -1 and +2 relative to the first conserved leucine influence affinity and selectivity for steroid and retinoid receptors, as demonstrated by peptide inhibition assays and yeast two-hybrid assays with defined point mutations.\",\n      \"method\": \"Peptide inhibition assay, yeast two-hybrid with mutant LXXLL core motifs\",\n      \"journal\": \"The Journal of biological chemistry\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 / Moderate — in vitro biochemical assay with mutagenesis plus yeast two-hybrid validation\",\n      \"pmids\": [\"11078741\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2001,\n      \"finding\": \"CtBP interacts with RIP140 in vitro and in vivo through the sequence PIDLSCK in the N-terminal third of RIP140. Acetylation of the lysine residue in this motif by p300/CBP dramatically reduces CtBP binding. Mutation of this lysine to glutamine decreases CtBP binding in vivo and abolishes transcriptional repression, revealing that p300/CBP-mediated acetylation disrupts the RIP140–CtBP complex and derepresses nuclear hormone receptor-regulated genes.\",\n      \"method\": \"In vitro binding, co-immunoprecipitation, acetylation-specific antibody, site-directed mutagenesis, reporter gene assay\",\n      \"journal\": \"Molecular and cellular biology\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 / Strong — in vitro and in vivo interaction, mutagenesis, modification-specific antibody, functional assay\",\n      \"pmids\": [\"11509661\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2001,\n      \"finding\": \"RIP140 interacts with retinoic acid receptor/RXR in a ligand-dependent manner through a novel C-terminal motif (LTKTNPILYYMLQK). RA induces co-immunoprecipitation of HDAC3 with RAR/RXR only in the presence of wild-type RIP140 (not C-terminal motif-deleted RIP140), and this is associated with decreased histone acetylation on RA response element-containing promoters.\",\n      \"method\": \"Domain mapping/mutagenesis, co-immunoprecipitation, chromatin immunoprecipitation (histone acetylation)\",\n      \"journal\": \"The Journal of biological chemistry\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1–2 / Moderate — mutagenesis + Co-IP + ChIP in single lab with multiple orthogonal methods\",\n      \"pmids\": [\"11278635\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2001,\n      \"finding\": \"14-3-3 proteins interact with the nuclear receptor corepressor RIP140. In transfection assays, 14-3-3 enhances GR transactivation while RIP140 antagonizes this effect. Co-localization studies show that 14-3-3 can export RIP140 out of the nucleus and alter its intranuclear localization, providing a mechanism for enhanced glucocorticoid responsiveness via nuclear depletion of this corepressor.\",\n      \"method\": \"Co-immunoprecipitation, co-localization imaging, transfection reporter assays\",\n      \"journal\": \"Molecular endocrinology\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2–3 / Moderate — Co-IP plus imaging plus functional assay in single lab\",\n      \"pmids\": [\"11266503\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2003,\n      \"finding\": \"In the absence of ligand-activated GR, RIP140 is localized in small nuclear foci targeted by a 40-amino-acid sequence. The focus-targeting domain overlaps with a CtBP-binding sequence but CtBP interaction is not required for focus localization. Upon GR ligand binding, RIP140 is redistributed to large nuclear domains, requiring RIP140 corepressor-activity regions and the GR DNA-binding domain. Full corepressor activity requires both C-terminal receptor-binding LXXLL motifs and CtBP interaction.\",\n      \"method\": \"Immunofluorescence/subcellular localization, domain-deletion analysis, co-localization with GR and SMRT, mutant functional assays\",\n      \"journal\": \"Molecular and cellular biology\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — direct localization experiments with domain-deletion mutagenesis and functional consequence established\",\n      \"pmids\": [\"12773562\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2004,\n      \"finding\": \"Mice devoid of RIP140 are lean, resist high-fat diet-induced obesity and hepatic steatosis, and have increased oxygen consumption. RIP140 absence leads to markedly increased UCP1 expression in white adipose tissue and reduced expression of certain lipogenic enzymes, establishing RIP140 as a ligand-dependent transcriptional repressor essential for maintaining energy storage vs. expenditure balance in adipose tissue.\",\n      \"method\": \"RIP140 knockout mouse model, gene expression analysis, metabolic phenotyping\",\n      \"journal\": \"PNAS\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — clean KO with defined metabolic phenotype, replicated in subsequent studies\",\n      \"pmids\": [\"15155905\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2000,\n      \"finding\": \"Nrip1 (RIP140) null female mice are infertile due to complete failure of mature follicles to release the oocyte at ovulation, while luteinization proceeds normally. This establishes a specific requirement for the corepressor activity of RIP140 in coordinating ovarian function for oocyte release.\",\n      \"method\": \"Nrip1 knockout mouse model, histological analysis of ovarian phenotype\",\n      \"journal\": \"Nature medicine\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — clean KO with specific defined phenotype, replicated by multiple subsequent studies\",\n      \"pmids\": [\"11100122\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2005,\n      \"finding\": \"RIP140 depletion by siRNA in 3T3-L1 adipocytes upregulates clusters of genes in glucose uptake, glycolysis, TCA cycle, fatty acid oxidation, mitochondrial biogenesis, and oxidative phosphorylation. Re-expression of RIP140 in RIP140-null MEFs downregulates these same genes. RIP140 mechanistically requires nuclear receptor ERRα to regulate hexose uptake and mitochondrial proteins SDHB and CoxVb. RIP140-null mice show enhanced glucose tolerance and insulin responsiveness.\",\n      \"method\": \"siRNA knockdown, Affymetrix microarray, metabolic assays ([14C]glucose oxidation, mitochondrial O2 consumption), RIP140 re-expression in null MEFs, mouse phenotyping\",\n      \"journal\": \"The Journal of clinical investigation\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — multiple orthogonal methods (siRNA, rescue, metabolic assays, in vivo), replicated across labs\",\n      \"pmids\": [\"16374519\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2005,\n      \"finding\": \"MAPK-mediated phosphorylation of RIP140 at Thr202 and Thr207 (in the N-terminal repression domain) enhances its co-repressive activity through increased recruitment of histone deacetylases (HDACs). Phospho-mimetic mutations at these residues convert RIP140 to a more potent repressor resistant to MAPK inhibitor, while dephosphorylation-mimetic mutations impair HDAC recruitment and repressive activity.\",\n      \"method\": \"Mass spectrometry phosphosite identification, site-directed mutagenesis, HDAC co-immunoprecipitation, reporter gene assays, MAPK inhibitor treatment\",\n      \"journal\": \"Molecular & cellular proteomics\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 / Moderate — MS site identification combined with mutagenesis and functional co-repressor assays in single lab\",\n      \"pmids\": [\"16093479\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2007,\n      \"finding\": \"RIP140 is expressed in a fiber type-specific manner in skeletal muscle. Low RIP140 promotes while increased expression suppresses formation of oxidative fibers. Genes involved in fatty-acid oxidation, oxidative phosphorylation, and mitochondrial biogenesis are upregulated in RIP140-null muscle. Changes in gene expression are intrinsic to muscle cells and nuclear receptor-regulated genes are direct targets for repression by RIP140.\",\n      \"method\": \"RIP140 null, heterozygous, and transgenic mouse models, gene expression profiling, cultured myofiber analysis\",\n      \"journal\": \"Cell metabolism\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — multiple genetic models (KO, het, transgenic) with gene expression and cellular phenotype\",\n      \"pmids\": [\"17767910\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2007,\n      \"finding\": \"RIP140 directly interacts with PGC-1α and suppresses its transcriptional activity. Both proteins regulate CIDEA expression via estrogen-related receptor alpha and NRF-1 binding sites on the CIDEA promoter. RIP140 represses while PGC-1α induces CIDEA expression, providing a direct antagonism between corepressor and coactivator via a nuclear receptor-dependent and -independent pathway.\",\n      \"method\": \"Co-immunoprecipitation (RIP140–PGC-1α direct interaction), promoter luciferase assays, chromatin immunoprecipitation, expression analysis in brown adipocytes\",\n      \"journal\": \"Molecular and cellular biology\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — direct Co-IP interaction, ChIP, functional reporter assays in single lab with multiple orthogonal methods\",\n      \"pmids\": [\"18794372\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2007,\n      \"finding\": \"RIP140 is essential for both DNA and histone methylation to maintain repression of the Ucp1 gene in white adipocytes. RIP140 promotes assembly of DNA methyltransferases and histone methyltransferases (HMTs) on the Ucp1 enhancer, leading to methylation of specific CpG residues and histones (evidenced by bisulfite genomic sequencing and ChIP), functioning as a scaffold for epigenetic repression machinery.\",\n      \"method\": \"Bisulfite genomic sequencing, chromatin immunoprecipitation, RIP140 null vs. wild-type adipocyte comparison\",\n      \"journal\": \"The EMBO journal\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — ChIP and bisulfite sequencing with KO comparison, multiple orthogonal epigenetic methods\",\n      \"pmids\": [\"17972916\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2007,\n      \"finding\": \"Pyridoxal 5'-phosphate (PLP, active form of vitamin B6) conjugates RIP140 at Lys613 (mapped by LC-ESI-MS/MS). This modification enhances RIP140 transcriptional corepressive activity and promotes its nuclear retention, attributed to increased interaction of PLP-modified RIP140 with histone deacetylases.\",\n      \"method\": \"LC-ESI-MS/MS modification site mapping, co-immunoprecipitation (HDAC interaction), reporter assays, adipocyte differentiation assay\",\n      \"journal\": \"Nature chemical biology\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 / Moderate — MS-based site identification plus functional assays and HDAC Co-IP in single lab\",\n      \"pmids\": [\"17277785\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2008,\n      \"finding\": \"PKCε phosphorylates RIP140 at Ser-102 and Ser-1003, which synergistically stimulates 14-3-3 binding; 14-3-3 then recruits protein arginine methyltransferase 1 (PRMT1) to methylate RIP140 arginine residues. Methylated RIP140 preferentially recruits exportin 1 (CRM1) for nuclear export, reducing nuclear gene-repressive activity. Phosphorylation-deficient RIP140 rescues fat accumulation defects in RIP140-null adipocytes more effectively than phospho-mimetic, cytoplasm-localizing RIP140.\",\n      \"method\": \"Site-directed mutagenesis, co-immunoprecipitation (PKCε, 14-3-3, PRMT1, exportin 1), subcellular fractionation, rescue experiments in null adipocytes\",\n      \"journal\": \"PloS one\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — cascade of Co-IPs with mutagenesis and functional rescue in single lab with multiple orthogonal methods\",\n      \"pmids\": [\"18628823\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2008,\n      \"finding\": \"SUMOylation of RIP140 at two conserved lysines (Lys756 in RD3 and Lys1154 in RD4) modulates its transcriptional repressor function. SUMO-1 is more efficiently conjugated than SUMO-2/3. Mutation of these SUMOylation sites compromises RIP140 corepressor activity, blunts repression of ERα-dependent transcription, and alters subnuclear distribution of RIP140.\",\n      \"method\": \"In vivo SUMOylation assay, site-directed mutagenesis (Lys756/1154), reporter gene assays, immunofluorescence localization\",\n      \"journal\": \"The Journal of biological chemistry\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1–2 / Moderate — site-specific mutagenesis combined with functional repression and localization assays\",\n      \"pmids\": [\"18211901\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2008,\n      \"finding\": \"p300 is the specific lysine acetyltransferase and Erk2 the specific kinase for RIP140 in adipocytes. Erk2 phosphorylates Thr202/Thr207, which recruits p300 for lysine acetylation of Lys158/Lys287. This phosphorylation→acetylation cascade enhances RIP140 gene-repressive activity. Acetylation-deficient RIP140 fails to rescue fat accumulation defects in RIP140-null cultures whereas phospho-mimetic RIP140 can.\",\n      \"method\": \"In vivo kinase/acetyltransferase identification, site-directed mutagenesis, co-immunoprecipitation, adipocyte rescue experiments\",\n      \"journal\": \"Cellular signalling\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1–2 / Moderate — Co-IP identification of enzymes plus mutagenesis and functional rescue with multiple orthogonal methods\",\n      \"pmids\": [\"18655826\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2009,\n      \"finding\": \"Cytoplasmic RIP140 (exported following PKCε phosphorylation and arginine methylation) interacts with Akt substrate AS160 and impedes Akt-mediated phosphorylation of AS160, thereby reducing GLUT4 trafficking and glucose uptake in adipocytes. This pathway is activated in epididymal adipocytes of diet-induced obese mice where nuclear PKCε is activated and cytoplasmic RIP140 is elevated.\",\n      \"method\": \"Co-immunoprecipitation (RIP140–AS160), subcellular fractionation, GLUT4 trafficking assay, glucose uptake assay, diet-induced obesity mouse model\",\n      \"journal\": \"Cell metabolism\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — direct Co-IP with functional GLUT4/glucose assays replicated in vivo in mouse model\",\n      \"pmids\": [\"19945409\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2009,\n      \"finding\": \"During T3-mediated repression of Crabp1 gene in differentiating adipocytes, RIP140 is required for the repression. RIP140 replaces coactivators GRIP1 and PCAF on the basal promoter and forms a repressive complex with CtBP1, HDAC3, and histone methyltransferase G9a. This is associated with loss of active chromatin marks (H3-Ac, H3K4-me3) and gain of repressive marks (H3K9-me3, H3K27-me3) and recruitment of HP1α, HP1γ, and H1 to the promoter.\",\n      \"method\": \"Chromatin immunoprecipitation, bisulfite sequencing, co-immunoprecipitation, gene expression analysis in differentiating 3T3-L1 cells\",\n      \"journal\": \"Nucleic acids research\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — ChIP profiling combined with Co-IP and functional gene expression assays in single lab\",\n      \"pmids\": [\"19778926\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2011,\n      \"finding\": \"Cytoplasmic RIP140 directly interacts with perilipin on lipid droplets in adipocytes (triggered by elevated diacylglycerol). This interaction facilitates perilipin's recruitment of hormone-sensitive lipase (HSL) to lipid droplets and promotes ATGL/CGI-58 complex formation, ultimately enhancing lipolysis. Blocking cytoplasmic RIP140 accumulation reduces basal and isoproterenol-stimulated lipolysis.\",\n      \"method\": \"Co-immunoprecipitation (RIP140–perilipin, perilipin–HSL, ATGL–CGI-58), lipid droplet fractionation, lipolysis assay, siRNA knockdown\",\n      \"journal\": \"Cellular signalling\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — direct Co-IP with functional lipolysis assays and knockdown in single lab with multiple orthogonal methods\",\n      \"pmids\": [\"21504789\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2011,\n      \"finding\": \"Cytoplasmic RIP140 regulates adiponectin secretion via interaction with AS160 without affecting adiponectin production or oligomerization. Knockdown of RIP140 or its nuclear export trigger PKCε promotes adiponectin secretion and consequently enhances glucose uptake in C2C12 cells and reduces gluconeogenesis in HepG2 cells.\",\n      \"method\": \"Co-immunoprecipitation (RIP140–AS160), ELISA (adiponectin secretion), siRNA knockdown, conditioned media experiments, neutralizing antibody\",\n      \"journal\": \"Cellular signalling\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2–3 / Moderate — Co-IP plus functional secretion and downstream metabolic assays in single lab\",\n      \"pmids\": [\"21872658\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2012,\n      \"finding\": \"LPS stimulates Syk kinase-mediated tyrosine phosphorylation of RIP140, which promotes interaction of NF-κB subunit RelA with RIP140, leading to recruitment of E3 ligase SCF complex that degrades RIP140 to inactivate proinflammatory cytokine genes. Macrophages expressing non-degradable RIP140 resist establishment of endotoxin tolerance for specific tolerizable genes, identifying RelA as an adaptor for SCF-mediated RIP140 degradation.\",\n      \"method\": \"Co-immunoprecipitation (RIP140–RelA, RIP140–SCF), phospho-tyrosine detection, non-degradable RIP140 mutant macrophages, LPS tolerance assays\",\n      \"journal\": \"Nature immunology\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — multiple Co-IPs with defined mutant and functional endotoxin tolerance assays in single lab\",\n      \"pmids\": [\"22388040\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2010,\n      \"finding\": \"RIP140 represses E2F1 transactivation on various E2F target promoters and inhibits expression of E2F1 target genes (e.g., CCNE1, CCNB2). Physical interaction between RIP140 and E2F1 was demonstrated by GST pull-down and co-immunoprecipitation. Increasing RIP140 levels reduces the proportion of cells in S phase in human cell lines.\",\n      \"method\": \"GST pull-down, co-immunoprecipitation, ChIP, transfection reporter assays, FACS cell cycle analysis\",\n      \"journal\": \"Clinical cancer research\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — reciprocal Co-IP plus ChIP and functional cell cycle assay in single lab\",\n      \"pmids\": [\"20410059\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2014,\n      \"finding\": \"RIP140 ChIP-seq reveals that it shares >80% of binding sites with ERα, co-localizing with FOXA1, GATA3, p300, CBP, and p160 family members at H3K4me1-demarcated enhancer regions. RIP140 is required for ERα complex formation and ERα-mediated gene expression and ERα-dependent breast cancer cell proliferation.\",\n      \"method\": \"ChIP-seq (RIP140, ERα), siRNA knockdown, gene expression analysis, cell proliferation assay\",\n      \"journal\": \"Cancer research\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — genome-wide ChIP-seq plus functional KD with defined cellular phenotype in single lab\",\n      \"pmids\": [\"25145671\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2014,\n      \"finding\": \"RIP140 inhibits intestinal epithelial cell proliferation and promotes APC transcription, inhibiting β-catenin activation and target gene expression. RIP140 overexpression strongly represses colon cancer cell proliferation in vitro and in vivo. In murine tissues and human cancer cells, RIP140 stimulates APC transcription.\",\n      \"method\": \"Rip140-null mice, RIP140 overexpressing transgenic mice, xenograft tumor model, gene expression analysis, reporter assays\",\n      \"journal\": \"The Journal of clinical investigation\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — multiple genetic mouse models plus in vitro and in vivo functional assays\",\n      \"pmids\": [\"24667635\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2014,\n      \"finding\": \"RIP140 in adipocyte chromatin remodeling requires its lysine acetylation for recruiting Brm (SWI/SNF ATPase subunit). RA-induced coordinated repressive chromatin-remodeling of Nanog and Oct4 gene loci in embryonic stem cells requires RAR-α, RIP140, and Brm.\",\n      \"method\": \"Chromatin immunoprecipitation, nucleosome positioning assay, RIP140 acetylation mutant, co-immunoprecipitation with Brm\",\n      \"journal\": \"Nucleic acids research\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — ChIP with acetylation mutagenesis, single lab\",\n      \"pmids\": [\"24489122\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2014,\n      \"finding\": \"RIP140 reduces expression of reverse cholesterol transport genes ABCA1 and ABCG1 in macrophages, enhancing foam cell formation. In macrophage-specific RIP140 knockdown crossed with ApoE null mice, high-cholesterol diet-induced atherosclerosis is significantly ameliorated.\",\n      \"method\": \"Gene expression analysis, macrophage-specific RIP140 knockdown transgenic mouse, ApoE null atherosclerosis model, lipid accumulation assay\",\n      \"journal\": \"Journal of molecular and cellular cardiology\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — in vivo mouse model with gene expression data, single lab\",\n      \"pmids\": [\"25528964\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2017,\n      \"finding\": \"RIP140 in osteoclast precursors inhibits osteoclast differentiation by forming a transcription-suppressor complex with testicular receptor 4 (TR4) to repress osteoclastogenic genes. Syk-stimulated RIP140 protein degradation terminates this suppressive activity. Monocyte/macrophage-specific RIP140 knockdown results in increased bone resorption and reduced bone formation.\",\n      \"method\": \"Co-immunoprecipitation (RIP140–TR4), macrophage-specific RIP140 KD mice, bone histomorphometry, Syk-mediated degradation assay, osteoclast differentiation assay\",\n      \"journal\": \"JCI insight\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — Co-IP interaction plus in vivo mouse model and defined mechanistic pathway in single lab\",\n      \"pmids\": [\"28405613\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2018,\n      \"finding\": \"Glyburide stimulates Ca2+/calmodulin-dependent protein kinase II (CaMKII) activation, which triggers specific ubiquitination of RIP140, leading to its degradation. This RIP140 degradation enhances M2 macrophage polarization and anti-inflammatory response.\",\n      \"method\": \"CaMKII activation assay, ubiquitination assay, RIP140 degradation measurement, macrophage polarization assay, wound healing model\",\n      \"journal\": \"Scientific reports\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — direct mechanistic assays for ubiquitination and degradation plus functional polarization assays, single lab\",\n      \"pmids\": [\"29339732\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2023,\n      \"finding\": \"RIP140 (encoded by Nrip1) suppresses a transcriptional regulatory network controlling cardiac fuel metabolism and contractile function. Striated muscle-specific RIP140 deficiency increases expression of genes involved in mitochondrial energy metabolism and contractile function. Cardiac-specific RIP140 deficiency protects against heart failure from pressure overload combined with myocardial infarction. Genomic enhancers activated by RIP140 deficiency are enriched for ERR and MEF2 binding motifs. Loss of RIP140 in heart augments triacylglyceride turnover and fatty acid utilization.\",\n      \"method\": \"Striated muscle-specific and cardiac-specific Nrip1 knockout mice, pressure overload + MI heart failure model, RNA-seq, ChIP-seq, metabolic flux assays\",\n      \"journal\": \"The Journal of clinical investigation\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — tissue-specific KO models with disease phenotype, genomics, and metabolic assays in single rigorous study\",\n      \"pmids\": [\"36927960\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2011,\n      \"finding\": \"RIP140 null soleus muscle shows increased GLUT4 trafficking and glucose uptake with no change in Akt activity, but with increased AMPK phosphorylation/activity and elevated UCP1 expression and mitochondrial uncoupling, revealing a pathway controlling insulin-independent glucose uptake through UCP1-mediated AMPK activation. RIP140 transgenic soleus shows reduced AMPK phosphorylation/activity.\",\n      \"method\": \"RIP140 null and transgenic mouse models, GLUT4 trafficking assay, glucose uptake assay, AMPK phosphorylation measurement, UCP1 expression, mitochondrial uncoupling assay\",\n      \"journal\": \"PloS one\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — complementary KO and transgenic models with multiple biochemical readouts in single lab\",\n      \"pmids\": [\"22389706\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2016,\n      \"finding\": \"RIP140 interacts with DNMT3b in macrophages (shown by co-immunoprecipitation). LPS stimulation increases PPARγ promoter methylation and inhibits its transcriptional activity; RIP140 knockdown reduces DNMT3b-mediated PPARγ promoter methylation and restores PPARγ activity.\",\n      \"method\": \"Co-immunoprecipitation (RIP140–DNMT3b), bisulfite pyrosequencing, PPARγ promoter methylation and activity assays, siRNA knockdown in RAW264.7 cells\",\n      \"journal\": \"Pulmonary pharmacology & therapeutics\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2–3 / Moderate — Co-IP plus bisulfite sequencing and functional assays in single lab\",\n      \"pmids\": [\"26921464\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2022,\n      \"finding\": \"RIP140 reduces transcription of the glucose transporter GLUT3 gene by inhibiting the transcriptional activity of HIF-2α in cooperation with p53, thereby suppressing glycolysis-dependent breast cancer cell proliferation.\",\n      \"method\": \"Cell proliferation assays, metabolic assays, reporter gene assays, siRNA knockdown, RIP140 overexpression, co-immunoprecipitation/interaction with HIF-2α and p53\",\n      \"journal\": \"Cellular and molecular life sciences\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — functional reporter and metabolic assays with defined transcription factor interplay, single lab\",\n      \"pmids\": [\"35501580\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2003,\n      \"finding\": \"RIP140 interacts with steroidogenic factor 1 (SF-1) through its AF-2 domain; the C-terminal region of RIP140 containing 4 LXXLL motifs shows the strongest interaction. RIP140 acts as a potent corepressor of SF-1-dependent transcription from the CYP17 CRS2 element and counteracts SRC/p160 coactivators. The inhibitory effect is partially reversed by trichostatin A, indicating HDAC involvement.\",\n      \"method\": \"GST pull-down, domain mapping, reporter gene assays in multiple cell types, trichostatin A treatment\",\n      \"journal\": \"Molecular and cellular endocrinology\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — direct pulldown with domain mapping and functional reporter assays in single lab\",\n      \"pmids\": [\"12782406\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2013,\n      \"finding\": \"RIP140 is required in both mammary epithelial and stromal compartments for ductal elongation during puberty and acts as a co-regulator with ERα to directly regulate expression of amphiregulin (Areg), the progesterone receptor (Pgr), and Stat5a, based on genome-wide ERα ChIP-seq and selective ChIP verification of RIP140 co-occupancy.\",\n      \"method\": \"RIP140-null and transgenic mouse models, tissue recombination experiments, ChIP-seq (ERα), ChIP (RIP140 co-occupancy), gene expression analysis\",\n      \"journal\": \"Development\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — in vivo genetic models plus ChIP-seq/ChIP and defined target genes in single rigorous study\",\n      \"pmids\": [\"23404106\"],\n      \"is_preprint\": false\n    }\n  ],\n  \"current_model\": \"NRIP1/RIP140 is a ligand-dependent transcriptional corepressor that is recruited via LXXLL motifs and a C-terminal receptor-interacting motif to the AF-2 domains of nuclear receptors (ER, TR, RAR/RXR, PPARs, GR, SF-1, ERR, TR2, AhR, and others), where it competes with coactivators (SRC-1, PGC-1α, PCAF) and actively represses transcription by scaffolding HDAC, CtBP, DNMT, and histone methyltransferase complexes; its activity is fine-tuned by a cascade of post-translational modifications (MAPK/Erk2 phosphorylation → p300 lysine acetylation; PKCε phosphorylation → 14-3-3 binding → PRMT1 arginine methylation → CRM1-dependent nuclear export; SUMOylation; PLP conjugation; Syk/CaMKII-triggered ubiquitination and degradation), which control its nuclear vs. cytoplasmic distribution and corepressor potency; in the cytoplasm, RIP140 additionally suppresses insulin signaling and GLUT4 trafficking by binding AS160, enhances lipolysis through perilipin interaction, and modulates adiponectin secretion, while in vivo loss-of-function establishes essential roles in female ovulation, adipose energy expenditure, skeletal muscle oxidative metabolism, cardiac fuel metabolism, intestinal homeostasis, macrophage polarization, and osteoclast differentiation.\"\n}\n```","stage2_raw":"{\n  \"mechanistic_narrative\": \"NRIP1 (RIP140) is a ligand-dependent transcriptional corepressor that is recruited to the AF-2 domains of nuclear receptors and orchestrates active gene silencing of metabolic and developmental programs [#0, #11]. It binds the ligand-activated estrogen receptor and a broad panel of nuclear receptors (TR, RAR/RXR, PPAR/RXR, GR, SF-1, TR2, AhR) through multiple LXXLL core motifs and an additional C-terminal receptor-interacting motif, and it competes directly with p160/SRC coactivators for the receptor AF-2 surface [#1, #2, #6, #8, #38]. Although named as a corepressor, on the estrogen receptor it co-occupies enhancers genome-wide with ER\\u03b1, FOXA1, GATA3 and p300/CBP and is required for ER\\u03b1 complex assembly and ER\\u03b1-driven transcription and proliferation [#28, #39]. Repression is executed by scaffolding chromatin-modifying machinery: RIP140 assembles CtBP, HDAC3, the histone methyltransferase G9a, DNA methyltransferases and the SWI/SNF ATPase Brm onto target promoters, replacing coactivators and converting chromatin from active to repressive marks [#7, #8, #17, #23, #30, #36]. Its corepressor potency and nucleocytoplasmic distribution are governed by a layered post-translational code\\u2014MAPK/Erk2 phosphorylation triggering p300 acetylation and enhanced HDAC recruitment, PKC\\u03b5 phosphorylation driving 14-3-3 binding, PRMT1 arginine methylation and CRM1-dependent nuclear export, plus SUMOylation, PLP conjugation and signal-induced ubiquitin-dependent degradation [#7, #14, #18, #19, #20, #21, #26, #33]. In the cytoplasm RIP140 acquires distinct functions, binding AS160 to suppress GLUT4 trafficking and adiponectin secretion and binding perilipin to promote lipolysis [#22, #24, #25]. Through these activities RIP140 is a master repressor of oxidative and energy-expenditure gene networks: its loss in mice produces a lean, energy-expending phenotype with derepressed UCP1, mitochondrial biogenesis and fatty-acid oxidation genes in adipose, skeletal muscle and heart, while it is also essential for ovulation, restrains intestinal and breast cancer cell proliferation, and tunes macrophage polarization and osteoclast differentiation [#11, #12, #13, #15, #34, #29, #28, #32].\",\n  \"teleology\": [\n    {\n      \"year\": 1995,\n      \"claim\": \"Established that NRIP1 is a genuine, ligand-regulated interaction partner of the estrogen receptor, defining it as a candidate nuclear receptor cofactor.\",\n      \"evidence\": \"In vitro binding, co-immunoprecipitation in cells, and reporter assays with the ER AF-2 domain\",\n      \"pmids\": [\"7641693\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Did not resolve whether NRIP1 activates or represses transcription\", \"Binding interface and motifs not yet mapped\"]\n    },\n    {\n      \"year\": 1996,\n      \"claim\": \"Mapped two independent receptor-binding sites and showed NRIP1 can bridge receptors to transcriptional machinery, beginning to define its cofactor architecture across multiple nuclear receptors.\",\n      \"evidence\": \"In vitro pulldown domain mapping plus GAL4-fusion reporter assays in yeast and mammalian cells\",\n      \"pmids\": [\"8887632\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Direction of transcriptional effect on physiological receptors unsettled\", \"Identity of recruited machinery unknown\"]\n    },\n    {\n      \"year\": 2000,\n      \"claim\": \"Defined NRIP1 as a corepressor that competes with SRC-1 coactivators for nuclear receptor AF-2, and that LXXLL core variants tune receptor affinity and selectivity.\",\n      \"evidence\": \"GST-pulldown, yeast two-hybrid, competitive binding and peptide inhibition assays on PPAR/RXR and steroid/retinoid receptors\",\n      \"pmids\": [\"9626662\", \"11078741\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Repressive effector complexes not identified\", \"In vivo relevance not established\"]\n    },\n    {\n      \"year\": 2000,\n      \"claim\": \"Provided the first in vivo demonstration of an essential, non-redundant physiological role, anchoring NRIP1 corepressor function in ovulation.\",\n      \"evidence\": \"Nrip1 knockout mice with histological ovarian analysis showing oocyte-release failure\",\n      \"pmids\": [\"11100122\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Molecular targets driving the ovulation defect not defined\", \"Which receptor pathway is dysregulated unclear\"]\n    },\n    {\n      \"year\": 2001,\n      \"claim\": \"Identified the effector complexes through which NRIP1 represses, showing it recruits CtBP and HDAC3 to nuclear receptor target promoters to reduce histone acetylation.\",\n      \"evidence\": \"In vitro binding, Co-IP, ChIP for histone acetylation, and motif-deletion mutants on RAR/RXR and CtBP-binding sequences\",\n      \"pmids\": [\"11509661\", \"11278635\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Full repertoire of recruited chromatin modifiers incomplete\", \"Regulation of complex assembly not yet defined\"]\n    },\n    {\n      \"year\": 2003,\n      \"claim\": \"Defined NRIP1 subnuclear targeting and showed repression requires both LXXLL receptor binding and CtBP interaction, integrating localization with corepressor potency.\",\n      \"evidence\": \"Immunofluorescence, domain-deletion analysis and co-localization with GR/SMRT, plus extension of corepressor activity to SF-1\",\n      \"pmids\": [\"12773562\", \"12782406\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Signals controlling focus-to-domain redistribution not fully resolved\", \"SF-1 finding limited to reporter systems\"]\n    },\n    {\n      \"year\": 2004,\n      \"claim\": \"Established NRIP1 as a physiological brake on adipose energy expenditure, linking its corepressor activity to whole-body metabolism.\",\n      \"evidence\": \"RIP140 knockout mice with metabolic phenotyping showing leanness, obesity resistance and derepressed UCP1\",\n      \"pmids\": [\"15155905\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Direct target genes and responsible nuclear receptor not yet pinned\", \"Tissue autonomy unresolved at this stage\"]\n    },\n    {\n      \"year\": 2007,\n      \"claim\": \"Defined the gene networks and partner receptors/coactivators through which NRIP1 controls oxidative metabolism, identifying ERR\\u03b1 dependence and direct PGC-1\\u03b1 antagonism.\",\n      \"evidence\": \"siRNA, microarray, rescue in null MEFs, metabolic assays, fiber-type-specific muscle genetics, and Co-IP/ChIP on CIDEA\",\n      \"pmids\": [\"16374519\", \"17767910\", \"18794372\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Mechanism of coactivator-corepressor switching at single loci not fully resolved\", \"Stoichiometry of PGC-1\\u03b1 antagonism unknown\"]\n    },\n    {\n      \"year\": 2007,\n      \"claim\": \"Showed NRIP1 acts as a scaffold for both DNA and histone methylation machinery, extending its repressive output to heritable epigenetic silencing of metabolic genes.\",\n      \"evidence\": \"Bisulfite sequencing and ChIP at the Ucp1 enhancer in null vs. wild-type adipocytes; LC-MS/MS mapping of PLP conjugation enhancing HDAC interaction\",\n      \"pmids\": [\"17972916\", \"17277785\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Recruitment order of DNMT/HMT complexes not defined\", \"Which signals trigger PLP conjugation in vivo unknown\"]\n    },\n    {\n      \"year\": 2008,\n      \"claim\": \"Defined a multi-layered post-translational code (phosphorylation\\u2192acetylation, SUMOylation) that tunes NRIP1 corepressor potency and its nuclear export.\",\n      \"evidence\": \"MS phosphosite mapping, kinase/acetyltransferase identification (Erk2/p300), PKC\\u03b5\\u201314-3-3\\u2013PRMT1\\u2013CRM1 cascade Co-IPs, SUMO mutagenesis and rescue in null adipocytes\",\n      \"pmids\": [\"16093479\", \"18211901\", \"18628823\", \"18655826\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Quantitative contribution of each modification in vivo unresolved\", \"Crosstalk hierarchy among modifications partially defined\"]\n    },\n    {\n      \"year\": 2009,\n      \"claim\": \"Discovered a distinct cytoplasmic, non-genomic role for NRIP1 in suppressing insulin-stimulated glucose uptake, mechanistically linking nuclear export to metabolic signaling.\",\n      \"evidence\": \"Co-IP with AS160, subcellular fractionation, GLUT4 trafficking and glucose uptake assays, and diet-induced obesity mouse model\",\n      \"pmids\": [\"19945409\", \"19778926\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"How cytoplasmic NRIP1 selects AS160 over other substrates unclear\", \"Reversibility of cytoplasmic accumulation in vivo not defined\"]\n    },\n    {\n      \"year\": 2011,\n      \"claim\": \"Broadened cytoplasmic NRIP1 functions to lipid droplet biology and adiponectin secretion, and connected its muscle metabolic action to AMPK-mediated insulin-independent glucose uptake.\",\n      \"evidence\": \"Co-IP with perilipin, lipolysis assays, adiponectin ELISA, and null/transgenic soleus muscle with AMPK and UCP1 readouts\",\n      \"pmids\": [\"21504789\", \"21872658\", \"22389706\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Adiponectin secretion finding is Medium-confidence and single-lab\", \"Switch between lipolytic and anti-lipogenic roles not fully integrated\"]\n    },\n    {\n      \"year\": 2012,\n      \"claim\": \"Established signal-induced degradation as a mechanism terminating NRIP1 repression, integrating it into inflammatory and immune gene control.\",\n      \"evidence\": \"Syk phosphorylation, RelA-adaptor Co-IPs, SCF E3 ligase recruitment, and non-degradable mutant macrophages in endotoxin tolerance assays\",\n      \"pmids\": [\"22388040\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Generality of degradation across tissues not established\", \"Which tolerizable gene set is directly bound unclear\"]\n    },\n    {\n      \"year\": 2014,\n      \"claim\": \"Repositioned NRIP1 in cancer biology, showing it is required for ER\\u03b1 enhancer complex formation in breast cancer yet suppresses Wnt/\\u03b2-catenin-driven intestinal proliferation.\",\n      \"evidence\": \"ChIP-seq co-occupancy with ER\\u03b1/FOXA1/p300, siRNA proliferation assays, and Rip140-null/transgenic mice with APC transcription and xenograft models\",\n      \"pmids\": [\"25145671\", \"24667635\", \"24489122\", \"20410059\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Context determinants of coactivator vs. corepressor role on ER\\u03b1 unresolved\", \"Direct vs. indirect control of APC transcription not fully dissected\"]\n    },\n    {\n      \"year\": 2017,\n      \"claim\": \"Extended the corepressor mechanism to immune and skeletal homeostasis, defining a TR4-based suppressor complex and degradation-controlled macrophage/osteoclast programs.\",\n      \"evidence\": \"Co-IP with TR4, macrophage-specific knockdown mice, bone histomorphometry, and CaMKII/ubiquitination-driven degradation polarization assays\",\n      \"pmids\": [\"28405613\", \"29339732\", \"26921464\", \"25528964\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Several findings (DNMT3b, atherosclerosis, M2 polarization) are Medium-confidence single-lab\", \"Direct osteoclastogenic target genes incompletely mapped\"]\n    },\n    {\n      \"year\": 2023,\n      \"claim\": \"Demonstrated that NRIP1 governs a cardiac fuel-metabolism and contractility transcriptional network, with loss conferring protection against heart failure.\",\n      \"evidence\": \"Striated-muscle- and cardiac-specific Nrip1 knockout mice, pressure-overload+MI heart failure model, RNA-seq/ChIP-seq, and metabolic flux assays implicating ERR and MEF2 enhancers\",\n      \"pmids\": [\"36927960\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Direct NRIP1-bound cardiac enhancers vs. indirect effects not fully separated\", \"Therapeutic window of cardiac NRIP1 inhibition undefined\"]\n    },\n    {\n      \"year\": null,\n      \"claim\": \"It remains unresolved what determines NRIP1's context-dependent switch between corepressor, ER\\u03b1-complex-assembly cofactor, and cytoplasmic signaling regulator, and how the post-translational code is integrated quantitatively in vivo.\",\n      \"evidence\": \"\",\n      \"pmids\": [],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"No structural model of full-length NRIP1 in receptor/chromatin complexes\", \"Cell-type rules dictating activator vs. repressor behavior unknown\", \"Human disease genetics not established in this corpus\"]\n    }\n  ],\n  \"mechanism_profile\": {\n    \"molecular_activity\": [\n      {\"term_id\": \"GO:0140110\", \"supporting_discovery_ids\": [0, 2, 11, 15, 16, 28]},\n      {\"term_id\": \"GO:0098772\", \"supporting_discovery_ids\": [2, 16, 22, 24]},\n      {\"term_id\": \"GO:0060090\", \"supporting_discovery_ids\": [7, 8, 17, 23, 30]},\n      {\"term_id\": \"GO:0042393\", \"supporting_discovery_ids\": [17, 23]}\n    ],\n    \"localization\": [\n      {\"term_id\": \"GO:0005634\", \"supporting_discovery_ids\": [0, 3, 10, 20]},\n      {\"term_id\": \"GO:0005654\", \"supporting_discovery_ids\": [10, 17, 23, 28]},\n      {\"term_id\": \"GO:0005829\", \"supporting_discovery_ids\": [19, 22, 24]},\n      {\"term_id\": \"GO:0005811\", \"supporting_discovery_ids\": [24]}\n    ],\n    \"pathway\": [\n      {\"term_id\": \"R-HSA-74160\", \"supporting_discovery_ids\": [0, 2, 8, 28]},\n      {\"term_id\": \"R-HSA-4839726\", \"supporting_discovery_ids\": [17, 23, 30]},\n      {\"term_id\": \"R-HSA-1430728\", \"supporting_discovery_ids\": [11, 13, 15, 22, 34]},\n      {\"term_id\": \"R-HSA-168256\", \"supporting_discovery_ids\": [26, 33, 36]},\n      {\"term_id\": \"R-HSA-162582\", \"supporting_discovery_ids\": [22, 24, 25]}\n    ],\n    \"complexes\": [\n      \"RIP140-CtBP-HDAC3-G9a corepressor complex\",\n      \"ER\\u03b1 enhancer complex (with FOXA1/GATA3/p300/p160)\",\n      \"RIP140-TR4 osteoclast suppressor complex\"\n    ],\n    \"partners\": [\n      \"ESR1\",\n      \"PGC-1\\u03b1\",\n      \"CtBP1\",\n      \"HDAC3\",\n      \"AS160\",\n      \"perilipin\",\n      \"RelA\",\n      \"TR4\"\n    ],\n    \"other_free_text\": []\n  }\n}","audit_flag":null,"evaluation":{"pairwise":"win","faith_supported":7,"faith_total":7,"faith_pct":100.0}}