{"gene":"CRIP1","run_date":"2026-06-09T22:57:19","timeline":{"discoveries":[{"year":1996,"finding":"CRIP1 (rat CRIP) is a 76-residue LIM-domain protein that binds two equivalents of zinc, forming N-terminal CCHC (Cys3, Cys6, His24, Cys27) and C-terminal CCCC (Cys30, Cys33, Cys51, Cys55) modules. The modules pack via hydrophobic interactions forming a compact structure; CCHC and CCCC modules each contain two orthogonally-arrayed antiparallel beta-sheets with a C-terminal alpha-helix.","method":"NMR spectroscopy (homonuclear and 1H-15N heteronuclear), 500 NOE-derived distance restraints, J-coupling and proton chemical shift analysis","journal":"Journal of molecular biology","confidence":"High","confidence_rationale":"Tier 1 / Strong — solution structure determination with extensive NOE restraints and functional validation of zinc coordination","pmids":["8632452"],"is_preprint":false},{"year":1992,"finding":"CRIP1 binds zinc in intestinal mucosa during absorption and functions as an intestinal zinc transport protein; high dietary zinc does not affect CRIP concentration but greatly increases metallothionein, which may compete with CRIP to decrease zinc absorption.","method":"Biochemical zinc-binding assays in intestinal mucosa","journal":"Nutrition reviews","confidence":"Low","confidence_rationale":"Tier 3 / Weak — single narrative review describing biochemical observations without detailed experimental methodology in the abstract","pmids":["1407754"],"is_preprint":false},{"year":2002,"finding":"Transgenic mice overexpressing rat CRIP show altered cytokine patterns: reduced IFN-gamma and IL-2, and elevated IL-6 and IL-10, upon LPS challenge or mitogen stimulation, indicating CRIP operates in a cellular pathway that shifts cytokine balance toward Th2; CRIP overexpression also caused delayed viral clearance after influenza infection.","method":"Transgenic mouse model with LPS challenge, mitogen stimulation of splenocytes, delayed-type hypersensitivity assay, influenza infection model","journal":"American journal of physiology. Endocrinology and metabolism","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — clean transgenic KO/OE model with multiple defined immunological phenotypic readouts in a single lab","pmids":["12006348"],"is_preprint":false},{"year":2008,"finding":"In C. elegans, CRIP homologues (EXC-9 and a second paralogue) maintain apical cytoskeletal flexibility in polarized epithelial cells to regulate tubule diameter; EXC-9 shows genetic interaction with the EXC-5 guanine exchange factor that regulates CDC-42 activity, placing CRIP in a CDC-42/GEF pathway controlling cytoskeletal organization.","method":"Genetic cloning of exc-9, epistasis analysis with exc-5 and other exc genes in C. elegans, tubule morphology phenotype analysis","journal":"Developmental biology","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — genetic epistasis in C. elegans with defined cellular phenotype; single lab but ortholog context is consistent with mammalian CRIP","pmids":["18384766"],"is_preprint":false},{"year":2013,"finding":"CRIP1 knockdown in T47D and BT474 breast cancer cells increased phosphorylation of MAPK and Akt, reduced phosphorylation of cdc2, and significantly elevated cell proliferation and invasion in vitro, indicating CRIP1 negatively regulates MAPK/Akt signaling and cell cycle progression.","method":"siRNA knockdown, immunoblotting, WST-1 proliferation assay, invasion assay","journal":"Molecular cancer","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — loss-of-function in two cell lines with defined signaling and phenotypic readouts; single lab","pmids":["23570421"],"is_preprint":false},{"year":2018,"finding":"CRIP1 overexpression in cervical cancer cells promotes migration, invasion, and epithelial-mesenchymal transition by activating the Wnt/β-catenin signaling pathway, increasing protein levels of c-myc, cyclin D1, and cytoplasmic β-catenin.","method":"Transient transfection overexpression and siRNA knockdown, western blot for EMT markers and Wnt pathway components, migration/invasion assays, immunohistochemistry","journal":"Life sciences","confidence":"Medium","confidence_rationale":"Tier 3 / Moderate — gain- and loss-of-function with defined pathway markers, replicated across in vitro and tissue contexts; single lab","pmids":["29959029"],"is_preprint":false},{"year":2021,"finding":"CRIP1 promotes homologous recombination (HR) DNA repair by: (1) stabilizing BRCA2 to counteract FBXO5-targeted RAD51 degradation; (2) binding directly to the RAD51 core domain (residues 184–257) in coordination with BRCA2 to facilitate masking of the RAD51 nuclear export signal; and (3) enabling KPNA4-mediated nuclear import of the CRIP1-BRCA2-RAD51 complex. Upon DNA damage, CRIP1 is deubiquitinated and upregulated by activated AKT signaling.","method":"Co-immunoprecipitation, mass spectrometry screening, siRNA knockdown, domain mapping, cisplatin/epirubicin/olaparib sensitivity assays, RAD51 nuclear enrichment imaging","journal":"Oncogene","confidence":"High","confidence_rationale":"Tier 2 / Strong — multiple orthogonal methods (Co-IP, MS, domain mapping, functional drug sensitivity) establishing mechanism in a single rigorous study","pmids":["34262130"],"is_preprint":false},{"year":2022,"finding":"CRIP1 interacts with the E3 ligase STUB1 and BBOX1, promoting BBOX1 ubiquitination at lysine 240 and proteasomal degradation, thereby reducing carnitine levels. Reduced acetylcarnitine decreases β-catenin acetylation and promotes nuclear accumulation of β-catenin, facilitating cancer stem-like properties in hepatocellular carcinoma.","method":"Co-immunoprecipitation, ubiquitination assay, proteasomal degradation assay, BBOX1 K240 mutagenesis, acetylation analysis, β-catenin nuclear localization assay","journal":"The EMBO journal","confidence":"High","confidence_rationale":"Tier 1–2 / Strong — reconstitution of ubiquitination, site-specific mutagenesis (K240), mechanistic link from BBOX1 degradation to carnitine to β-catenin acetylation validated by multiple orthogonal methods","pmids":["35775648"],"is_preprint":false},{"year":2023,"finding":"CRIP1 binds to NF-κB/p65 and facilitates its nuclear translocation in an importin-dependent manner in pancreatic ductal adenocarcinoma cells, leading to transcriptional activation of CXCL1 and CXCL5, which promote chemotactic migration of myeloid-derived suppressor cells and immunosuppression.","method":"Co-immunoprecipitation, RNA sequencing, mass spectrometry, chromatin immunoprecipitation, orthotopic allograft model, flow cytometry, multiplexed imaging","journal":"Gut","confidence":"High","confidence_rationale":"Tier 2 / Strong — reciprocal Co-IP, ChIP validation of downstream transcription, in vivo model with mechanistic rescue; multiple orthogonal methods in one study","pmids":["37541772"],"is_preprint":false},{"year":2023,"finding":"CRIP1 silencing in AML (U937 and THP1) cells causes inactivation of the Wnt/β-catenin pathway through upregulation of axin1 protein, and the Wnt/β-catenin agonist SKL2001 rescues the growth and migration defects induced by CRIP1 knockdown, placing CRIP1 upstream of axin1/β-catenin in AML.","method":"Lentiviral shRNA knockdown, western blot, pharmacological rescue with SKL2001, growth/migration/colony assays, cell cycle analysis","journal":"Leukemia research","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — epistasis by pharmacological rescue combined with KD; single lab, two cell lines","pmids":["37224580"],"is_preprint":false},{"year":2024,"finding":"CRIP1 simultaneously binds deubiquitinase USP7 and proteasome coactivator PA200, forming a CRIP1/USP7/PA200 complex. CRIP1 promotes proteasome activity and autophagosome maturation by facilitating USP7-mediated deubiquitination and stabilization of PA200, thereby dually regulating protein homeostasis in multiple myeloma cells.","method":"Co-immunoprecipitation with tandem affinity purification/mass spectrometry (TAP/MS), RNA-seq, proteasome activity assay, autophagy assay, xenograft model","journal":"EBioMedicine","confidence":"High","confidence_rationale":"Tier 2 / Strong — TAP/MS identification of complex followed by Co-IP validation, functional proteasome and autophagy assays, and in vivo model; multiple orthogonal methods","pmids":["38199044"],"is_preprint":false},{"year":2023,"finding":"Single-cell RNA sequencing of human fetal epicardium identified CRIP1 as a regulator of epicardial epithelial-to-mesenchymal transition (EMT), with expression distinguishing epithelial from mesenchymal subpopulations.","method":"Single-cell RNA sequencing of isolated human fetal epicardium, population-specific marker analysis","journal":"Stem cell reports","confidence":"Low","confidence_rationale":"Tier 3 / Weak — transcriptomic association from scRNA-seq without direct functional manipulation of CRIP1 in this specific study","pmids":["37390825"],"is_preprint":false},{"year":2025,"finding":"PRMT5-mediated symmetric dimethylation of CRIP1 at R26/R68 activates the Wnt/β-catenin pathway to promote stemness in senescent SCLC cells post-chemotherapy; subsequently, PRMT1-mediated asymmetric dimethylation of CRIP1 at R16 suppresses the p38 pathway to accelerate proliferation of stem-like cells and drive rapid tumor recurrence.","method":"Arginine methylation assays, site-specific mutagenesis (R16, R26, R68), Wnt/β-catenin and p38 pathway reporter/immunoblot assays, PRMT1/PRMT5 inhibitor treatments, PELI1 E3 ligase regulation of PRMTs","journal":"International journal of biological sciences","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — site-specific mutagenesis identifying distinct methylation sites with distinct downstream pathway effects; single lab","pmids":["41079921"],"is_preprint":false},{"year":2025,"finding":"CRIP1 recruits the E3 ubiquitin ligase UBE3A to MFGE8 in chondrocytes, promoting MFGE8 ubiquitination and proteasomal degradation, which activates the NF-κB pathway (p65 phosphorylation) and drives ECM degradation in osteoarthritis.","method":"Immunoprecipitation/mass spectrometry, label-free quantitative proteomics, Co-IP, proteasome inhibitor rescue, CRIP1 KD/OE in primary chondrocytes and OA mouse model","journal":"Biochemical pharmacology","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — MS identification of CRIP1-MFGE8 interaction, Co-IP confirmation, and proteasome inhibitor rescue; single lab","pmids":["41067282"],"is_preprint":false},{"year":2025,"finding":"CRIP1 undergoes MOF-mediated lactylation at K49 in rheumatoid arthritis synovial fibroblasts. Lactylated CRIP1 binds and sequesters the cell-cycle inhibitor p21 away from CDK2, facilitating G1/S cell cycle transition and synovial proliferation. AAV delivery of a K49R lactylation-deficient CRIP1 mutant significantly reduced synovial proliferation.","method":"Protein lactylation assays, MOF writer identification, K49R mutagenesis, co-immunoprecipitation of CRIP1-p21-CDK2, AAV gene delivery, CIA and humanized NSG mouse models","journal":"JCI insight","confidence":"High","confidence_rationale":"Tier 1–2 / Strong — site-specific mutagenesis (K49R) with in vivo AAV rescue, identification of writer (MOF), mechanistic link to p21/CDK2 by Co-IP; multiple orthogonal methods","pmids":["42258744"],"is_preprint":false},{"year":2026,"finding":"In triple-negative breast cancer, macrophage-expressed HTRA1 associates with CRIP1 to facilitate CRIP1 binding to NF-κB, activating downstream CXCL12 transcription; this leads to T-cell egress from tumors and limits immunotherapy efficacy.","method":"Co-immunoprecipitation (HTRA1-CRIP1-NF-κB), single-cell and spatial transcriptomics, macrophage-specific Htra1 knockout mouse model, pharmacological CXCL12/CXCR4 blockade","journal":"Cancer immunology research","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — Co-IP establishing HTRA1-CRIP1-NF-κB complex, in vivo genetic KO with defined T-cell phenotype; single lab","pmids":["41854522"],"is_preprint":false},{"year":2025,"finding":"CRIP1 promotes NFATC2 binding to the SREBF1 promoter, driving SREBF1 transcription; elevated SREBF1 increases intracellular ROS levels, thereby activating endoplasmic reticulum stress and promoting malignant phenotypes in melanoma cells.","method":"RNA sequencing, chromatin immunoprecipitation (ChIP), dual-luciferase reporter, western blot, ROS measurement, 4-PBA/NAC pharmacological intervention, xenograft model","journal":"Biochemical pharmacology","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — ChIP validating NFATC2 binding at SREBF1 promoter downstream of CRIP1, supported by reporter assay and pharmacological rescue; single lab","pmids":["42134671"],"is_preprint":false},{"year":2025,"finding":"CRIP1 inhibits mitochondrial biogenesis in melanoma cells by suppressing the protein levels of TFAM (mitochondrial transcription factor A), reducing mitochondrial DNA copy number, ATP production, respiratory capacity, and oxidative phosphorylation protein expression.","method":"CRIP1 overexpression and knockdown stable lines, western blot, immunofluorescence, OCR (oxygen consumption rate), mitochondrial DNA assay, cytosolic ATP assay","journal":"Scientific reports","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — multiple orthogonal functional assays of mitochondrial parameters with gain/loss-of-function; single lab, mechanism limited to protein-level suppression of TFAM without direct binding shown","pmids":["39905216"],"is_preprint":false},{"year":2025,"finding":"In vitro, recombinant CRIP1 bound Aβ peptide and accelerated amyloid fibril formation, providing a mechanistic link between CRIP1 and vascular amyloid pathology in cerebral amyloid angiopathy.","method":"In vitro Aβ-binding assay and fibril formation kinetics assay with recombinant CRIP1","journal":"bioRxiv","confidence":"Low","confidence_rationale":"Tier 3 / Weak — single in vitro biochemical assay from a preprint; not independently replicated","pmids":["bio_10.1101_2025.10.08.25337413"],"is_preprint":true},{"year":2024,"finding":"CRIP1 knockdown in AML cells (OCI-AML3) increases glucose uptake, lactate production, and LDHA protein expression, indicating CRIP1 normally suppresses glycolytic reprogramming. CRIP1-deficient cells show enhanced sensitivity to the glycolytic inhibitor 2-DG.","method":"Lentiviral shRNA knockdown, glucose consumption assay, lactate secretion assay, western blot (LDHA, HK2, MCL1), flow cytometry cell death assay","journal":"Molecular biology reports / Scientific reports","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — consistent findings replicated across two published papers (PMID:41670839 and PMID:41986400) from the same group using loss-of-function with metabolic readouts","pmids":["41670839","41986400"],"is_preprint":false}],"current_model":"CRIP1 is a double-zinc-finger LIM-domain protein that operates as a multifunctional signaling scaffold: it binds NF-κB/p65 to facilitate its nuclear translocation (activating CXCL1/5 or CXCL12 transcription), interacts with BRCA2 and RAD51 to promote nuclear enrichment of RAD51 and homologous recombination repair, bridges BBOX1 with the E3 ligase STUB1 to drive BBOX1 ubiquitination and carnitine metabolism suppression (thereby promoting β-catenin nuclear accumulation), forms a complex with USP7 and PA200 to dual-regulate proteasome activity and autophagy, recruits UBE3A to ubiquitinate MFGE8, undergoes site-specific arginine methylation by PRMT1/PRMT5 to differentially modulate Wnt/β-catenin and p38 pathways, and is lactylated at K49 by MOF to sequester p21 from CDK2 and drive cell cycle progression; in non-malignant contexts its C. elegans ortholog maintains apical cytoskeletal flexibility via genetic interaction with a CDC-42 GEF, and the protein suppresses glycolytic reprogramming and TFAM-mediated mitochondrial biogenesis in certain cancer settings."},"narrative":{"mechanistic_narrative":"CRIP1 is a compact double-zinc-finger LIM-domain protein, structurally organized into N-terminal CCHC and C-terminal CCCC zinc modules that pack into a single folded unit [PMID:8632452], and it functions as a multifunctional signaling scaffold that couples post-translational modification of partner proteins to transcriptional and metabolic reprogramming, predominantly characterized in cancer contexts. A recurrent theme is its control of protein turnover through E3 ligase and deubiquitinase machinery: CRIP1 bridges the E3 ligase STUB1 to BBOX1 to drive BBOX1 ubiquitination and degradation, lowering carnitine and acetylcarnitine to reduce β-catenin acetylation and promote its nuclear accumulation [PMID:35775648], recruits UBE3A to ubiquitinate MFGE8 to activate NF-κB-driven matrix degradation [PMID:41067282], and assembles a USP7/PA200 complex that stabilizes PA200 to co-regulate proteasome activity and autophagy [PMID:38199044]. CRIP1 also acts as a direct binding partner of NF-κB/p65, facilitating importin-dependent nuclear translocation and transcription of chemokines including CXCL1, CXCL5 and CXCL12 that shape an immunosuppressive tumor microenvironment [PMID:37541772, PMID:41854522]. In DNA repair, CRIP1 binds the RAD51 core domain together with BRCA2 and enables KPNA4-mediated nuclear import to promote homologous recombination [PMID:34262130]. CRIP1 activity is tuned by site-specific modification — PRMT5 and PRMT1 deposit distinct arginine methylations that differentially engage Wnt/β-catenin versus p38 signaling [PMID:41079921], and MOF-mediated K49 lactylation lets CRIP1 sequester p21 from CDK2 to drive cell-cycle progression [PMID:42258744]. Across multiple settings CRIP1 modulates the Wnt/β-catenin axis [PMID:29959029, PMID:37224580] and constrains metabolic reprogramming, suppressing glycolysis [PMID:41670839, PMID:41986400] and TFAM-dependent mitochondrial biogenesis [PMID:39905216].","teleology":[{"year":1996,"claim":"Established the physical architecture of CRIP1 as a two-module zinc-binding LIM protein, defining the structural basis for its later scaffolding roles.","evidence":"NMR solution structure with NOE-derived restraints and zinc coordination analysis of rat CRIP","pmids":["8632452"],"confidence":"High","gaps":["Structure alone does not reveal protein partners or cellular function","No mapping of which surfaces mediate protein-protein interactions"]},{"year":1992,"claim":"Initial functional hypothesis framed CRIP as an intestinal zinc transport protein, raising the question of whether zinc binding is structural or transport-related.","evidence":"Biochemical zinc-binding observations in intestinal mucosa (narrative review)","pmids":["1407754"],"confidence":"Low","gaps":["Single narrative review without detailed methodology","Transport function not reconciled with later signaling/scaffold roles"]},{"year":2002,"claim":"Linked CRIP1 to immune regulation by showing overexpression shifts cytokine balance toward a Th2 profile, the first in vivo functional consequence.","evidence":"Transgenic mouse overexpression with LPS/mitogen challenge and influenza infection","pmids":["12006348"],"confidence":"Medium","gaps":["Molecular mediators of the cytokine shift not identified","No mechanistic link to a defined signaling pathway"]},{"year":2008,"claim":"Placed the CRIP ortholog in a CDC-42/GEF cytoskeletal pathway, suggesting a conserved role in apical cytoskeletal organization of polarized epithelia.","evidence":"Genetic cloning and epistasis of exc-9 with exc-5 in C. elegans tubule morphology","pmids":["18384766"],"confidence":"Medium","gaps":["Direct molecular partners of EXC-9 not defined","Relevance to mammalian CRIP1 cytoskeletal function untested"]},{"year":2013,"claim":"Defined CRIP1 as a negative regulator of MAPK/Akt signaling and proliferation in breast cancer, establishing a tumor-suppressive activity in some contexts.","evidence":"siRNA knockdown with immunoblotting, proliferation and invasion assays in T47D and BT474 cells","pmids":["23570421"],"confidence":"Medium","gaps":["Direct molecular target within MAPK/Akt pathway not identified","Mechanism of cdc2 dephosphorylation unresolved"]},{"year":2018,"claim":"Identified CRIP1 as an activator of Wnt/β-catenin signaling driving EMT, an apparently opposite role to its breast-cancer suppression, indicating context-dependent function.","evidence":"Gain/loss-of-function with EMT and Wnt marker immunoblotting, migration/invasion assays in cervical cancer","pmids":["29959029"],"confidence":"Medium","gaps":["Direct mechanism of Wnt pathway engagement not shown","No partner protein identified at this stage"]},{"year":2021,"claim":"Resolved a direct molecular mechanism by which CRIP1 promotes homologous recombination, binding the RAD51 core domain with BRCA2 and enabling nuclear import.","evidence":"Co-IP, MS, domain mapping, KPNA4-dependent import imaging, drug sensitivity assays","pmids":["34262130"],"confidence":"High","gaps":["Structural basis of the CRIP1-RAD51-BRCA2 complex not solved","How AKT-driven deubiquitination of CRIP1 is regulated unclear"]},{"year":2022,"claim":"Established CRIP1 as an adaptor that bridges an E3 ligase to a substrate, linking BBOX1 degradation through carnitine metabolism to β-catenin nuclear accumulation.","evidence":"Co-IP, ubiquitination/degradation assays, BBOX1 K240 mutagenesis, acetylation and β-catenin localization assays","pmids":["35775648"],"confidence":"High","gaps":["Whether CRIP1 directs STUB1 to other substrates unknown","Quantitative contribution of carnitine vs other inputs to β-catenin acetylation not defined"]},{"year":2023,"claim":"Defined CRIP1 as a direct NF-κB/p65 binding partner that drives chemokine transcription and immunosuppression, connecting it to the tumor immune microenvironment.","evidence":"Reciprocal Co-IP, RNA-seq, ChIP, orthotopic allograft, flow cytometry in PDAC","pmids":["37541772"],"confidence":"High","gaps":["Whether CRIP1 modifies p65 or merely chaperones it unresolved","Mapping of the CRIP1-p65 interaction interface absent"]},{"year":2023,"claim":"Reinforced a Wnt/β-catenin role in AML by positioning CRIP1 upstream of axin1, with pharmacological rescue establishing pathway epistasis.","evidence":"shRNA knockdown, immunoblotting, SKL2001 rescue, growth/migration assays in U937 and THP1","pmids":["37224580"],"confidence":"Medium","gaps":["Direct molecular link between CRIP1 and axin1 not shown","Mechanism of axin1 upregulation upon CRIP1 loss unknown"]},{"year":2024,"claim":"Showed CRIP1 scaffolds a USP7/PA200 complex to dually regulate proteasome activity and autophagy, extending its role in protein homeostasis.","evidence":"TAP/MS, Co-IP, proteasome activity and autophagy assays, xenograft in multiple myeloma","pmids":["38199044"],"confidence":"High","gaps":["Stoichiometry and assembly order of the complex undefined","How CRIP1 selects USP7 substrates beyond PA200 unknown"]},{"year":2024,"claim":"Identified CRIP1 as a suppressor of glycolytic reprogramming in AML, linking it to metabolic control of leukemic cells.","evidence":"shRNA knockdown with glucose/lactate assays, LDHA immunoblotting, 2-DG sensitivity across two papers","pmids":["41670839","41986400"],"confidence":"Medium","gaps":["Direct molecular target controlling LDHA/glycolysis not defined","Connection to CRIP1's other pathways unestablished"]},{"year":2025,"claim":"Revealed that arginine methylation by PRMT5 and PRMT1 at distinct residues acts as a molecular switch routing CRIP1 toward Wnt/β-catenin or p38 signaling to drive tumor recurrence.","evidence":"Site-specific mutagenesis (R16/R26/R68), pathway reporters, PRMT inhibitors in senescent SCLC","pmids":["41079921"],"confidence":"Medium","gaps":["How methylation alters CRIP1 partner binding mechanistically unclear","Single-lab finding without independent confirmation"]},{"year":2025,"claim":"Demonstrated MOF-mediated K49 lactylation lets CRIP1 sequester p21 from CDK2, providing a metabolite-sensing route to cell-cycle progression validated in vivo.","evidence":"Lactylation assays, K49R mutagenesis, CRIP1-p21-CDK2 Co-IP, AAV rescue in arthritis mouse models","pmids":["42258744"],"confidence":"High","gaps":["Whether lactylation affects CRIP1's other interactions untested","Structural basis of p21 sequestration not resolved"]},{"year":2025,"claim":"Extended CRIP1's E3-recruiting adaptor role to UBE3A-mediated MFGE8 degradation, linking it to NF-κB activation and matrix degradation in osteoarthritis.","evidence":"IP/MS, Co-IP, proteasome inhibitor rescue, KD/OE in chondrocytes and OA mouse model","pmids":["41067282"],"confidence":"Medium","gaps":["Whether CRIP1 directs UBE3A to additional substrates unknown","Direct binding interfaces not mapped"]},{"year":2025,"claim":"Connected CRIP1 to transcriptional control of lipogenesis and ER stress by promoting NFATC2 occupancy at the SREBF1 promoter in melanoma.","evidence":"RNA-seq, ChIP, dual-luciferase reporter, ROS measurement, pharmacological rescue, xenograft","pmids":["42134671"],"confidence":"Medium","gaps":["Whether CRIP1 directly contacts NFATC2 or chromatin unclear","Single-lab study"]},{"year":2025,"claim":"Identified CRIP1 as a suppressor of TFAM-mediated mitochondrial biogenesis, complementing its glycolytic-suppression role in metabolic regulation.","evidence":"Gain/loss-of-function lines, OCR, mtDNA and ATP assays, TFAM immunoblotting in melanoma","pmids":["39905216"],"confidence":"Medium","gaps":["No direct CRIP1-TFAM binding shown","Mechanism of TFAM protein-level suppression unresolved"]},{"year":2025,"claim":"A preprint links CRIP1 to amyloid pathology, with recombinant CRIP1 accelerating Aβ fibril formation in vitro.","evidence":"In vitro Aβ-binding and fibril kinetics assays with recombinant CRIP1 (preprint)","pmids":["bio_10.1101_2025.10.08.25337413"],"confidence":"Low","gaps":["Single in vitro assay from a preprint, not independently replicated","No cellular or in vivo validation of the Aβ interaction"]},{"year":null,"claim":"How CRIP1's single LIM-domain scaffold selects among its many reported partners (NF-κB, RAD51/BRCA2, STUB1/BBOX1, USP7/PA200, UBE3A) and how this is governed by its post-translational modifications across cell types remains unresolved.","evidence":"","pmids":[],"confidence":"Medium","gaps":["No unifying structural model of CRIP1-partner selectivity","Modification-dependent interactome not systematically mapped","Reconciliation of tumor-suppressive vs oncogenic roles across tissues incomplete"]}],"mechanism_profile":{"molecular_activity":[{"term_id":"GO:0060090","term_label":"molecular adaptor activity","supporting_discovery_ids":[6,7,8,10,13]},{"term_id":"GO:0098772","term_label":"molecular function regulator activity","supporting_discovery_ids":[10,14]},{"term_id":"GO:0140110","term_label":"transcription regulator activity","supporting_discovery_ids":[8,16]}],"localization":[{"term_id":"GO:0005634","term_label":"nucleus","supporting_discovery_ids":[6,8]},{"term_id":"GO:0005829","term_label":"cytosol","supporting_discovery_ids":[10]}],"pathway":[{"term_id":"R-HSA-73894","term_label":"DNA Repair","supporting_discovery_ids":[6]},{"term_id":"R-HSA-162582","term_label":"Signal Transduction","supporting_discovery_ids":[5,8,9]},{"term_id":"R-HSA-392499","term_label":"Metabolism of proteins","supporting_discovery_ids":[7,10,13]},{"term_id":"R-HSA-168256","term_label":"Immune System","supporting_discovery_ids":[8,15]},{"term_id":"R-HSA-1640170","term_label":"Cell Cycle","supporting_discovery_ids":[14]}],"complexes":["CRIP1/USP7/PA200 complex","CRIP1-BRCA2-RAD51 complex"],"partners":["RELA","BRCA2","RAD51","STUB1","BBOX1","USP7","PA200","UBE3A"],"other_free_text":[]}},"prefetch_data":{"uniprot":{"accession":"P50238","full_name":"Cysteine-rich protein 1","aliases":["Cysteine-rich heart protein","CRHP","hCRHP","Cysteine-rich intestinal protein","CRIP"],"length_aa":77,"mass_kda":8.5,"function":"Seems to have a role in zinc absorption and may function as an intracellular zinc transport protein","subcellular_location":"","url":"https://www.uniprot.org/uniprotkb/P50238/entry"},"depmap":{"release":"DepMap","has_data":true,"is_common_essential":false,"resolved_as":"","url":"https://depmap.org/portal/gene/CRIP1","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":[],"url":"https://opencell.sf.czbiohub.org/search/CRIP1","total_profiled":1310},"omim":[{"mim_id":"618538","title":"CANNABINOID RECEPTOR-INTERACTING PROTEIN 1; CNRIP1","url":"https://www.omim.org/entry/618538"},{"mim_id":"609096","title":"F-BOX ONLY PROTEIN 22; FBXO22","url":"https://www.omim.org/entry/609096"},{"mim_id":"601183","title":"CYSTEINE-RICH INTESTINAL PROTEIN 2; CRIP2","url":"https://www.omim.org/entry/601183"},{"mim_id":"123875","title":"CYSTEINE-RICH INTESTINAL PROTEIN 1; CRIP1","url":"https://www.omim.org/entry/123875"},{"mim_id":"114610","title":"CANNABINOID RECEPTOR 1; CNR1","url":"https://www.omim.org/entry/114610"}],"hpa":{"profiled":true,"resolved_as":"","reliability":"Approved","locations":[{"location":"Nuclear speckles","reliability":"Approved"},{"location":"Cytosol","reliability":"Approved"},{"location":"Plasma membrane","reliability":"Additional"},{"location":"Centrosome","reliability":"Additional"}],"tissue_specificity":"Tissue enhanced","tissue_distribution":"Detected in many","driving_tissues":[{"tissue":"blood vessel","ntpm":548.9}],"url":"https://www.proteinatlas.org/search/CRIP1"},"hgnc":{"alias_symbol":["CRIP"],"prev_symbol":[]},"alphafold":{"accession":"P50238","domains":[{"cath_id":"2.10.110.10","chopping":"15-59","consensus_level":"high","plddt":88.6238,"start":15,"end":59}],"viewer_url":"https://alphafold.ebi.ac.uk/entry/P50238","model_url":"https://alphafold.ebi.ac.uk/files/AF-P50238-F1-model_v6.cif","pae_url":"https://alphafold.ebi.ac.uk/files/AF-P50238-F1-predicted_aligned_error_v6.png","plddt_mean":81.81},"mouse_models":{"mgi_url":"https://www.informatics.jax.org/marker/summary?nomen=CRIP1","jax_strain_url":"https://www.jax.org/strain/search?query=CRIP1"},"sequence":{"accession":"P50238","fasta_url":"https://rest.uniprot.org/uniprotkb/P50238.fasta","uniprot_url":"https://www.uniprot.org/uniprotkb/P50238/entry","alphafold_viewer_url":"https://alphafold.ebi.ac.uk/entry/P50238"}},"corpus_meta":[{"pmid":"17486081","id":"PMC_17486081","title":"Hypomethylation of WNT5A, CRIP1 and S100P in prostate cancer.","date":"2007","source":"Oncogene","url":"https://pubmed.ncbi.nlm.nih.gov/17486081","citation_count":117,"is_preprint":false},{"pmid":"17895407","id":"PMC_17895407","title":"CB1 cannabinoid receptor activity is modulated by the cannabinoid receptor interacting protein CRIP 1a.","date":"2007","source":"Molecular pharmacology","url":"https://pubmed.ncbi.nlm.nih.gov/17895407","citation_count":112,"is_preprint":false},{"pmid":"37541772","id":"PMC_37541772","title":"CRIP1 fosters MDSC trafficking and resets tumour microenvironment via facilitating NF-κB/p65 nuclear translocation in pancreatic ductal adenocarcinoma.","date":"2023","source":"Gut","url":"https://pubmed.ncbi.nlm.nih.gov/37541772","citation_count":92,"is_preprint":false},{"pmid":"31537716","id":"PMC_31537716","title":"CRIP: predicting circRNA-RBP-binding sites using a codon-based encoding and hybrid deep neural networks.","date":"2019","source":"RNA (New York, 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LIM-domain protein that binds two equivalents of zinc, forming N-terminal CCHC (Cys3, Cys6, His24, Cys27) and C-terminal CCCC (Cys30, Cys33, Cys51, Cys55) modules. The modules pack via hydrophobic interactions forming a compact structure; CCHC and CCCC modules each contain two orthogonally-arrayed antiparallel beta-sheets with a C-terminal alpha-helix.\",\n      \"method\": \"NMR spectroscopy (homonuclear and 1H-15N heteronuclear), 500 NOE-derived distance restraints, J-coupling and proton chemical shift analysis\",\n      \"journal\": \"Journal of molecular biology\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 / Strong — solution structure determination with extensive NOE restraints and functional validation of zinc coordination\",\n      \"pmids\": [\"8632452\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 1992,\n      \"finding\": \"CRIP1 binds zinc in intestinal mucosa during absorption and functions as an intestinal zinc transport protein; high dietary zinc does not affect CRIP concentration but greatly increases metallothionein, which may compete with CRIP to decrease zinc absorption.\",\n      \"method\": \"Biochemical zinc-binding assays in intestinal mucosa\",\n      \"journal\": \"Nutrition reviews\",\n      \"confidence\": \"Low\",\n      \"confidence_rationale\": \"Tier 3 / Weak — single narrative review describing biochemical observations without detailed experimental methodology in the abstract\",\n      \"pmids\": [\"1407754\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2002,\n      \"finding\": \"Transgenic mice overexpressing rat CRIP show altered cytokine patterns: reduced IFN-gamma and IL-2, and elevated IL-6 and IL-10, upon LPS challenge or mitogen stimulation, indicating CRIP operates in a cellular pathway that shifts cytokine balance toward Th2; CRIP overexpression also caused delayed viral clearance after influenza infection.\",\n      \"method\": \"Transgenic mouse model with LPS challenge, mitogen stimulation of splenocytes, delayed-type hypersensitivity assay, influenza infection model\",\n      \"journal\": \"American journal of physiology. Endocrinology and metabolism\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — clean transgenic KO/OE model with multiple defined immunological phenotypic readouts in a single lab\",\n      \"pmids\": [\"12006348\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2008,\n      \"finding\": \"In C. elegans, CRIP homologues (EXC-9 and a second paralogue) maintain apical cytoskeletal flexibility in polarized epithelial cells to regulate tubule diameter; EXC-9 shows genetic interaction with the EXC-5 guanine exchange factor that regulates CDC-42 activity, placing CRIP in a CDC-42/GEF pathway controlling cytoskeletal organization.\",\n      \"method\": \"Genetic cloning of exc-9, epistasis analysis with exc-5 and other exc genes in C. elegans, tubule morphology phenotype analysis\",\n      \"journal\": \"Developmental biology\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — genetic epistasis in C. elegans with defined cellular phenotype; single lab but ortholog context is consistent with mammalian CRIP\",\n      \"pmids\": [\"18384766\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2013,\n      \"finding\": \"CRIP1 knockdown in T47D and BT474 breast cancer cells increased phosphorylation of MAPK and Akt, reduced phosphorylation of cdc2, and significantly elevated cell proliferation and invasion in vitro, indicating CRIP1 negatively regulates MAPK/Akt signaling and cell cycle progression.\",\n      \"method\": \"siRNA knockdown, immunoblotting, WST-1 proliferation assay, invasion assay\",\n      \"journal\": \"Molecular cancer\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — loss-of-function in two cell lines with defined signaling and phenotypic readouts; single lab\",\n      \"pmids\": [\"23570421\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2018,\n      \"finding\": \"CRIP1 overexpression in cervical cancer cells promotes migration, invasion, and epithelial-mesenchymal transition by activating the Wnt/β-catenin signaling pathway, increasing protein levels of c-myc, cyclin D1, and cytoplasmic β-catenin.\",\n      \"method\": \"Transient transfection overexpression and siRNA knockdown, western blot for EMT markers and Wnt pathway components, migration/invasion assays, immunohistochemistry\",\n      \"journal\": \"Life sciences\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 3 / Moderate — gain- and loss-of-function with defined pathway markers, replicated across in vitro and tissue contexts; single lab\",\n      \"pmids\": [\"29959029\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2021,\n      \"finding\": \"CRIP1 promotes homologous recombination (HR) DNA repair by: (1) stabilizing BRCA2 to counteract FBXO5-targeted RAD51 degradation; (2) binding directly to the RAD51 core domain (residues 184–257) in coordination with BRCA2 to facilitate masking of the RAD51 nuclear export signal; and (3) enabling KPNA4-mediated nuclear import of the CRIP1-BRCA2-RAD51 complex. Upon DNA damage, CRIP1 is deubiquitinated and upregulated by activated AKT signaling.\",\n      \"method\": \"Co-immunoprecipitation, mass spectrometry screening, siRNA knockdown, domain mapping, cisplatin/epirubicin/olaparib sensitivity assays, RAD51 nuclear enrichment imaging\",\n      \"journal\": \"Oncogene\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — multiple orthogonal methods (Co-IP, MS, domain mapping, functional drug sensitivity) establishing mechanism in a single rigorous study\",\n      \"pmids\": [\"34262130\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2022,\n      \"finding\": \"CRIP1 interacts with the E3 ligase STUB1 and BBOX1, promoting BBOX1 ubiquitination at lysine 240 and proteasomal degradation, thereby reducing carnitine levels. Reduced acetylcarnitine decreases β-catenin acetylation and promotes nuclear accumulation of β-catenin, facilitating cancer stem-like properties in hepatocellular carcinoma.\",\n      \"method\": \"Co-immunoprecipitation, ubiquitination assay, proteasomal degradation assay, BBOX1 K240 mutagenesis, acetylation analysis, β-catenin nuclear localization assay\",\n      \"journal\": \"The EMBO journal\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1–2 / Strong — reconstitution of ubiquitination, site-specific mutagenesis (K240), mechanistic link from BBOX1 degradation to carnitine to β-catenin acetylation validated by multiple orthogonal methods\",\n      \"pmids\": [\"35775648\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2023,\n      \"finding\": \"CRIP1 binds to NF-κB/p65 and facilitates its nuclear translocation in an importin-dependent manner in pancreatic ductal adenocarcinoma cells, leading to transcriptional activation of CXCL1 and CXCL5, which promote chemotactic migration of myeloid-derived suppressor cells and immunosuppression.\",\n      \"method\": \"Co-immunoprecipitation, RNA sequencing, mass spectrometry, chromatin immunoprecipitation, orthotopic allograft model, flow cytometry, multiplexed imaging\",\n      \"journal\": \"Gut\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — reciprocal Co-IP, ChIP validation of downstream transcription, in vivo model with mechanistic rescue; multiple orthogonal methods in one study\",\n      \"pmids\": [\"37541772\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2023,\n      \"finding\": \"CRIP1 silencing in AML (U937 and THP1) cells causes inactivation of the Wnt/β-catenin pathway through upregulation of axin1 protein, and the Wnt/β-catenin agonist SKL2001 rescues the growth and migration defects induced by CRIP1 knockdown, placing CRIP1 upstream of axin1/β-catenin in AML.\",\n      \"method\": \"Lentiviral shRNA knockdown, western blot, pharmacological rescue with SKL2001, growth/migration/colony assays, cell cycle analysis\",\n      \"journal\": \"Leukemia research\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — epistasis by pharmacological rescue combined with KD; single lab, two cell lines\",\n      \"pmids\": [\"37224580\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2024,\n      \"finding\": \"CRIP1 simultaneously binds deubiquitinase USP7 and proteasome coactivator PA200, forming a CRIP1/USP7/PA200 complex. CRIP1 promotes proteasome activity and autophagosome maturation by facilitating USP7-mediated deubiquitination and stabilization of PA200, thereby dually regulating protein homeostasis in multiple myeloma cells.\",\n      \"method\": \"Co-immunoprecipitation with tandem affinity purification/mass spectrometry (TAP/MS), RNA-seq, proteasome activity assay, autophagy assay, xenograft model\",\n      \"journal\": \"EBioMedicine\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — TAP/MS identification of complex followed by Co-IP validation, functional proteasome and autophagy assays, and in vivo model; multiple orthogonal methods\",\n      \"pmids\": [\"38199044\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2023,\n      \"finding\": \"Single-cell RNA sequencing of human fetal epicardium identified CRIP1 as a regulator of epicardial epithelial-to-mesenchymal transition (EMT), with expression distinguishing epithelial from mesenchymal subpopulations.\",\n      \"method\": \"Single-cell RNA sequencing of isolated human fetal epicardium, population-specific marker analysis\",\n      \"journal\": \"Stem cell reports\",\n      \"confidence\": \"Low\",\n      \"confidence_rationale\": \"Tier 3 / Weak — transcriptomic association from scRNA-seq without direct functional manipulation of CRIP1 in this specific study\",\n      \"pmids\": [\"37390825\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2025,\n      \"finding\": \"PRMT5-mediated symmetric dimethylation of CRIP1 at R26/R68 activates the Wnt/β-catenin pathway to promote stemness in senescent SCLC cells post-chemotherapy; subsequently, PRMT1-mediated asymmetric dimethylation of CRIP1 at R16 suppresses the p38 pathway to accelerate proliferation of stem-like cells and drive rapid tumor recurrence.\",\n      \"method\": \"Arginine methylation assays, site-specific mutagenesis (R16, R26, R68), Wnt/β-catenin and p38 pathway reporter/immunoblot assays, PRMT1/PRMT5 inhibitor treatments, PELI1 E3 ligase regulation of PRMTs\",\n      \"journal\": \"International journal of biological sciences\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — site-specific mutagenesis identifying distinct methylation sites with distinct downstream pathway effects; single lab\",\n      \"pmids\": [\"41079921\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2025,\n      \"finding\": \"CRIP1 recruits the E3 ubiquitin ligase UBE3A to MFGE8 in chondrocytes, promoting MFGE8 ubiquitination and proteasomal degradation, which activates the NF-κB pathway (p65 phosphorylation) and drives ECM degradation in osteoarthritis.\",\n      \"method\": \"Immunoprecipitation/mass spectrometry, label-free quantitative proteomics, Co-IP, proteasome inhibitor rescue, CRIP1 KD/OE in primary chondrocytes and OA mouse model\",\n      \"journal\": \"Biochemical pharmacology\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — MS identification of CRIP1-MFGE8 interaction, Co-IP confirmation, and proteasome inhibitor rescue; single lab\",\n      \"pmids\": [\"41067282\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2025,\n      \"finding\": \"CRIP1 undergoes MOF-mediated lactylation at K49 in rheumatoid arthritis synovial fibroblasts. Lactylated CRIP1 binds and sequesters the cell-cycle inhibitor p21 away from CDK2, facilitating G1/S cell cycle transition and synovial proliferation. AAV delivery of a K49R lactylation-deficient CRIP1 mutant significantly reduced synovial proliferation.\",\n      \"method\": \"Protein lactylation assays, MOF writer identification, K49R mutagenesis, co-immunoprecipitation of CRIP1-p21-CDK2, AAV gene delivery, CIA and humanized NSG mouse models\",\n      \"journal\": \"JCI insight\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1–2 / Strong — site-specific mutagenesis (K49R) with in vivo AAV rescue, identification of writer (MOF), mechanistic link to p21/CDK2 by Co-IP; multiple orthogonal methods\",\n      \"pmids\": [\"42258744\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2026,\n      \"finding\": \"In triple-negative breast cancer, macrophage-expressed HTRA1 associates with CRIP1 to facilitate CRIP1 binding to NF-κB, activating downstream CXCL12 transcription; this leads to T-cell egress from tumors and limits immunotherapy efficacy.\",\n      \"method\": \"Co-immunoprecipitation (HTRA1-CRIP1-NF-κB), single-cell and spatial transcriptomics, macrophage-specific Htra1 knockout mouse model, pharmacological CXCL12/CXCR4 blockade\",\n      \"journal\": \"Cancer immunology research\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — Co-IP establishing HTRA1-CRIP1-NF-κB complex, in vivo genetic KO with defined T-cell phenotype; single lab\",\n      \"pmids\": [\"41854522\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2025,\n      \"finding\": \"CRIP1 promotes NFATC2 binding to the SREBF1 promoter, driving SREBF1 transcription; elevated SREBF1 increases intracellular ROS levels, thereby activating endoplasmic reticulum stress and promoting malignant phenotypes in melanoma cells.\",\n      \"method\": \"RNA sequencing, chromatin immunoprecipitation (ChIP), dual-luciferase reporter, western blot, ROS measurement, 4-PBA/NAC pharmacological intervention, xenograft model\",\n      \"journal\": \"Biochemical pharmacology\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — ChIP validating NFATC2 binding at SREBF1 promoter downstream of CRIP1, supported by reporter assay and pharmacological rescue; single lab\",\n      \"pmids\": [\"42134671\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2025,\n      \"finding\": \"CRIP1 inhibits mitochondrial biogenesis in melanoma cells by suppressing the protein levels of TFAM (mitochondrial transcription factor A), reducing mitochondrial DNA copy number, ATP production, respiratory capacity, and oxidative phosphorylation protein expression.\",\n      \"method\": \"CRIP1 overexpression and knockdown stable lines, western blot, immunofluorescence, OCR (oxygen consumption rate), mitochondrial DNA assay, cytosolic ATP assay\",\n      \"journal\": \"Scientific reports\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — multiple orthogonal functional assays of mitochondrial parameters with gain/loss-of-function; single lab, mechanism limited to protein-level suppression of TFAM without direct binding shown\",\n      \"pmids\": [\"39905216\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2025,\n      \"finding\": \"In vitro, recombinant CRIP1 bound Aβ peptide and accelerated amyloid fibril formation, providing a mechanistic link between CRIP1 and vascular amyloid pathology in cerebral amyloid angiopathy.\",\n      \"method\": \"In vitro Aβ-binding assay and fibril formation kinetics assay with recombinant CRIP1\",\n      \"journal\": \"bioRxiv\",\n      \"confidence\": \"Low\",\n      \"confidence_rationale\": \"Tier 3 / Weak — single in vitro biochemical assay from a preprint; not independently replicated\",\n      \"pmids\": [\"bio_10.1101_2025.10.08.25337413\"],\n      \"is_preprint\": true\n    },\n    {\n      \"year\": 2024,\n      \"finding\": \"CRIP1 knockdown in AML cells (OCI-AML3) increases glucose uptake, lactate production, and LDHA protein expression, indicating CRIP1 normally suppresses glycolytic reprogramming. CRIP1-deficient cells show enhanced sensitivity to the glycolytic inhibitor 2-DG.\",\n      \"method\": \"Lentiviral shRNA knockdown, glucose consumption assay, lactate secretion assay, western blot (LDHA, HK2, MCL1), flow cytometry cell death assay\",\n      \"journal\": \"Molecular biology reports / Scientific reports\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — consistent findings replicated across two published papers (PMID:41670839 and PMID:41986400) from the same group using loss-of-function with metabolic readouts\",\n      \"pmids\": [\"41670839\", \"41986400\"],\n      \"is_preprint\": false\n    }\n  ],\n  \"current_model\": \"CRIP1 is a double-zinc-finger LIM-domain protein that operates as a multifunctional signaling scaffold: it binds NF-κB/p65 to facilitate its nuclear translocation (activating CXCL1/5 or CXCL12 transcription), interacts with BRCA2 and RAD51 to promote nuclear enrichment of RAD51 and homologous recombination repair, bridges BBOX1 with the E3 ligase STUB1 to drive BBOX1 ubiquitination and carnitine metabolism suppression (thereby promoting β-catenin nuclear accumulation), forms a complex with USP7 and PA200 to dual-regulate proteasome activity and autophagy, recruits UBE3A to ubiquitinate MFGE8, undergoes site-specific arginine methylation by PRMT1/PRMT5 to differentially modulate Wnt/β-catenin and p38 pathways, and is lactylated at K49 by MOF to sequester p21 from CDK2 and drive cell cycle progression; in non-malignant contexts its C. elegans ortholog maintains apical cytoskeletal flexibility via genetic interaction with a CDC-42 GEF, and the protein suppresses glycolytic reprogramming and TFAM-mediated mitochondrial biogenesis in certain cancer settings.\"\n}\n```","stage2_raw":"{\n  \"mechanistic_narrative\": \"CRIP1 is a compact double-zinc-finger LIM-domain protein, structurally organized into N-terminal CCHC and C-terminal CCCC zinc modules that pack into a single folded unit [#0], and it functions as a multifunctional signaling scaffold that couples post-translational modification of partner proteins to transcriptional and metabolic reprogramming, predominantly characterized in cancer contexts. A recurrent theme is its control of protein turnover through E3 ligase and deubiquitinase machinery: CRIP1 bridges the E3 ligase STUB1 to BBOX1 to drive BBOX1 ubiquitination and degradation, lowering carnitine and acetylcarnitine to reduce \\u03b2-catenin acetylation and promote its nuclear accumulation [#7], recruits UBE3A to ubiquitinate MFGE8 to activate NF-\\u03baB-driven matrix degradation [#13], and assembles a USP7/PA200 complex that stabilizes PA200 to co-regulate proteasome activity and autophagy [#10]. CRIP1 also acts as a direct binding partner of NF-\\u03baB/p65, facilitating importin-dependent nuclear translocation and transcription of chemokines including CXCL1, CXCL5 and CXCL12 that shape an immunosuppressive tumor microenvironment [#8, #15]. In DNA repair, CRIP1 binds the RAD51 core domain together with BRCA2 and enables KPNA4-mediated nuclear import to promote homologous recombination [#6]. CRIP1 activity is tuned by site-specific modification \\u2014 PRMT5 and PRMT1 deposit distinct arginine methylations that differentially engage Wnt/\\u03b2-catenin versus p38 signaling [#12], and MOF-mediated K49 lactylation lets CRIP1 sequester p21 from CDK2 to drive cell-cycle progression [#14]. Across multiple settings CRIP1 modulates the Wnt/\\u03b2-catenin axis [#5, #9] and constrains metabolic reprogramming, suppressing glycolysis [#19] and TFAM-dependent mitochondrial biogenesis [#17].\",\n  \"teleology\": [\n    {\n      \"year\": 1996,\n      \"claim\": \"Established the physical architecture of CRIP1 as a two-module zinc-binding LIM protein, defining the structural basis for its later scaffolding roles.\",\n      \"evidence\": \"NMR solution structure with NOE-derived restraints and zinc coordination analysis of rat CRIP\",\n      \"pmids\": [\"8632452\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Structure alone does not reveal protein partners or cellular function\", \"No mapping of which surfaces mediate protein-protein interactions\"]\n    },\n    {\n      \"year\": 1992,\n      \"claim\": \"Initial functional hypothesis framed CRIP as an intestinal zinc transport protein, raising the question of whether zinc binding is structural or transport-related.\",\n      \"evidence\": \"Biochemical zinc-binding observations in intestinal mucosa (narrative review)\",\n      \"pmids\": [\"1407754\"],\n      \"confidence\": \"Low\",\n      \"gaps\": [\"Single narrative review without detailed methodology\", \"Transport function not reconciled with later signaling/scaffold roles\"]\n    },\n    {\n      \"year\": 2002,\n      \"claim\": \"Linked CRIP1 to immune regulation by showing overexpression shifts cytokine balance toward a Th2 profile, the first in vivo functional consequence.\",\n      \"evidence\": \"Transgenic mouse overexpression with LPS/mitogen challenge and influenza infection\",\n      \"pmids\": [\"12006348\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Molecular mediators of the cytokine shift not identified\", \"No mechanistic link to a defined signaling pathway\"]\n    },\n    {\n      \"year\": 2008,\n      \"claim\": \"Placed the CRIP ortholog in a CDC-42/GEF cytoskeletal pathway, suggesting a conserved role in apical cytoskeletal organization of polarized epithelia.\",\n      \"evidence\": \"Genetic cloning and epistasis of exc-9 with exc-5 in C. elegans tubule morphology\",\n      \"pmids\": [\"18384766\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Direct molecular partners of EXC-9 not defined\", \"Relevance to mammalian CRIP1 cytoskeletal function untested\"]\n    },\n    {\n      \"year\": 2013,\n      \"claim\": \"Defined CRIP1 as a negative regulator of MAPK/Akt signaling and proliferation in breast cancer, establishing a tumor-suppressive activity in some contexts.\",\n      \"evidence\": \"siRNA knockdown with immunoblotting, proliferation and invasion assays in T47D and BT474 cells\",\n      \"pmids\": [\"23570421\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Direct molecular target within MAPK/Akt pathway not identified\", \"Mechanism of cdc2 dephosphorylation unresolved\"]\n    },\n    {\n      \"year\": 2018,\n      \"claim\": \"Identified CRIP1 as an activator of Wnt/\\u03b2-catenin signaling driving EMT, an apparently opposite role to its breast-cancer suppression, indicating context-dependent function.\",\n      \"evidence\": \"Gain/loss-of-function with EMT and Wnt marker immunoblotting, migration/invasion assays in cervical cancer\",\n      \"pmids\": [\"29959029\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Direct mechanism of Wnt pathway engagement not shown\", \"No partner protein identified at this stage\"]\n    },\n    {\n      \"year\": 2021,\n      \"claim\": \"Resolved a direct molecular mechanism by which CRIP1 promotes homologous recombination, binding the RAD51 core domain with BRCA2 and enabling nuclear import.\",\n      \"evidence\": \"Co-IP, MS, domain mapping, KPNA4-dependent import imaging, drug sensitivity assays\",\n      \"pmids\": [\"34262130\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Structural basis of the CRIP1-RAD51-BRCA2 complex not solved\", \"How AKT-driven deubiquitination of CRIP1 is regulated unclear\"]\n    },\n    {\n      \"year\": 2022,\n      \"claim\": \"Established CRIP1 as an adaptor that bridges an E3 ligase to a substrate, linking BBOX1 degradation through carnitine metabolism to \\u03b2-catenin nuclear accumulation.\",\n      \"evidence\": \"Co-IP, ubiquitination/degradation assays, BBOX1 K240 mutagenesis, acetylation and \\u03b2-catenin localization assays\",\n      \"pmids\": [\"35775648\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Whether CRIP1 directs STUB1 to other substrates unknown\", \"Quantitative contribution of carnitine vs other inputs to \\u03b2-catenin acetylation not defined\"]\n    },\n    {\n      \"year\": 2023,\n      \"claim\": \"Defined CRIP1 as a direct NF-\\u03baB/p65 binding partner that drives chemokine transcription and immunosuppression, connecting it to the tumor immune microenvironment.\",\n      \"evidence\": \"Reciprocal Co-IP, RNA-seq, ChIP, orthotopic allograft, flow cytometry in PDAC\",\n      \"pmids\": [\"37541772\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Whether CRIP1 modifies p65 or merely chaperones it unresolved\", \"Mapping of the CRIP1-p65 interaction interface absent\"]\n    },\n    {\n      \"year\": 2023,\n      \"claim\": \"Reinforced a Wnt/\\u03b2-catenin role in AML by positioning CRIP1 upstream of axin1, with pharmacological rescue establishing pathway epistasis.\",\n      \"evidence\": \"shRNA knockdown, immunoblotting, SKL2001 rescue, growth/migration assays in U937 and THP1\",\n      \"pmids\": [\"37224580\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Direct molecular link between CRIP1 and axin1 not shown\", \"Mechanism of axin1 upregulation upon CRIP1 loss unknown\"]\n    },\n    {\n      \"year\": 2024,\n      \"claim\": \"Showed CRIP1 scaffolds a USP7/PA200 complex to dually regulate proteasome activity and autophagy, extending its role in protein homeostasis.\",\n      \"evidence\": \"TAP/MS, Co-IP, proteasome activity and autophagy assays, xenograft in multiple myeloma\",\n      \"pmids\": [\"38199044\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Stoichiometry and assembly order of the complex undefined\", \"How CRIP1 selects USP7 substrates beyond PA200 unknown\"]\n    },\n    {\n      \"year\": 2024,\n      \"claim\": \"Identified CRIP1 as a suppressor of glycolytic reprogramming in AML, linking it to metabolic control of leukemic cells.\",\n      \"evidence\": \"shRNA knockdown with glucose/lactate assays, LDHA immunoblotting, 2-DG sensitivity across two papers\",\n      \"pmids\": [\"41670839\", \"41986400\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Direct molecular target controlling LDHA/glycolysis not defined\", \"Connection to CRIP1's other pathways unestablished\"]\n    },\n    {\n      \"year\": 2025,\n      \"claim\": \"Revealed that arginine methylation by PRMT5 and PRMT1 at distinct residues acts as a molecular switch routing CRIP1 toward Wnt/\\u03b2-catenin or p38 signaling to drive tumor recurrence.\",\n      \"evidence\": \"Site-specific mutagenesis (R16/R26/R68), pathway reporters, PRMT inhibitors in senescent SCLC\",\n      \"pmids\": [\"41079921\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"How methylation alters CRIP1 partner binding mechanistically unclear\", \"Single-lab finding without independent confirmation\"]\n    },\n    {\n      \"year\": 2025,\n      \"claim\": \"Demonstrated MOF-mediated K49 lactylation lets CRIP1 sequester p21 from CDK2, providing a metabolite-sensing route to cell-cycle progression validated in vivo.\",\n      \"evidence\": \"Lactylation assays, K49R mutagenesis, CRIP1-p21-CDK2 Co-IP, AAV rescue in arthritis mouse models\",\n      \"pmids\": [\"42258744\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Whether lactylation affects CRIP1's other interactions untested\", \"Structural basis of p21 sequestration not resolved\"]\n    },\n    {\n      \"year\": 2025,\n      \"claim\": \"Extended CRIP1's E3-recruiting adaptor role to UBE3A-mediated MFGE8 degradation, linking it to NF-\\u03baB activation and matrix degradation in osteoarthritis.\",\n      \"evidence\": \"IP/MS, Co-IP, proteasome inhibitor rescue, KD/OE in chondrocytes and OA mouse model\",\n      \"pmids\": [\"41067282\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Whether CRIP1 directs UBE3A to additional substrates unknown\", \"Direct binding interfaces not mapped\"]\n    },\n    {\n      \"year\": 2025,\n      \"claim\": \"Connected CRIP1 to transcriptional control of lipogenesis and ER stress by promoting NFATC2 occupancy at the SREBF1 promoter in melanoma.\",\n      \"evidence\": \"RNA-seq, ChIP, dual-luciferase reporter, ROS measurement, pharmacological rescue, xenograft\",\n      \"pmids\": [\"42134671\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Whether CRIP1 directly contacts NFATC2 or chromatin unclear\", \"Single-lab study\"]\n    },\n    {\n      \"year\": 2025,\n      \"claim\": \"Identified CRIP1 as a suppressor of TFAM-mediated mitochondrial biogenesis, complementing its glycolytic-suppression role in metabolic regulation.\",\n      \"evidence\": \"Gain/loss-of-function lines, OCR, mtDNA and ATP assays, TFAM immunoblotting in melanoma\",\n      \"pmids\": [\"39905216\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"No direct CRIP1-TFAM binding shown\", \"Mechanism of TFAM protein-level suppression unresolved\"]\n    },\n    {\n      \"year\": 2025,\n      \"claim\": \"A preprint links CRIP1 to amyloid pathology, with recombinant CRIP1 accelerating A\\u03b2 fibril formation in vitro.\",\n      \"evidence\": \"In vitro A\\u03b2-binding and fibril kinetics assays with recombinant CRIP1 (preprint)\",\n      \"pmids\": [\"bio_10.1101_2025.10.08.25337413\"],\n      \"confidence\": \"Low\",\n      \"gaps\": [\"Single in vitro assay from a preprint, not independently replicated\", \"No cellular or in vivo validation of the A\\u03b2 interaction\"]\n    },\n    {\n      \"year\": null,\n      \"claim\": \"How CRIP1's single LIM-domain scaffold selects among its many reported partners (NF-\\u03baB, RAD51/BRCA2, STUB1/BBOX1, USP7/PA200, UBE3A) and how this is governed by its post-translational modifications across cell types remains unresolved.\",\n      \"evidence\": \"\",\n      \"pmids\": [],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"No unifying structural model of CRIP1-partner selectivity\", \"Modification-dependent interactome not systematically mapped\", \"Reconciliation of tumor-suppressive vs oncogenic roles across tissues incomplete\"]\n    }\n  ],\n  \"mechanism_profile\": {\n    \"molecular_activity\": [\n      {\"term_id\": \"GO:0060090\", \"supporting_discovery_ids\": [6, 7, 8, 10, 13]},\n      {\"term_id\": \"GO:0098772\", \"supporting_discovery_ids\": [10, 14]},\n      {\"term_id\": \"GO:0140110\", \"supporting_discovery_ids\": [8, 16]}\n    ],\n    \"localization\": [\n      {\"term_id\": \"GO:0005634\", \"supporting_discovery_ids\": [6, 8]},\n      {\"term_id\": \"GO:0005829\", \"supporting_discovery_ids\": [10]}\n    ],\n    \"pathway\": [\n      {\"term_id\": \"R-HSA-73894\", \"supporting_discovery_ids\": [6]},\n      {\"term_id\": \"R-HSA-162582\", \"supporting_discovery_ids\": [5, 8, 9]},\n      {\"term_id\": \"R-HSA-392499\", \"supporting_discovery_ids\": [7, 10, 13]},\n      {\"term_id\": \"R-HSA-168256\", \"supporting_discovery_ids\": [8, 15]},\n      {\"term_id\": \"R-HSA-1640170\", \"supporting_discovery_ids\": [14]}\n    ],\n    \"complexes\": [\"CRIP1/USP7/PA200 complex\", \"CRIP1-BRCA2-RAD51 complex\"],\n    \"partners\": [\"RELA\", \"BRCA2\", \"RAD51\", \"STUB1\", \"BBOX1\", \"USP7\", \"PA200\", \"UBE3A\"],\n    \"other_free_text\": []\n  }\n}","audit_flag":null,"evaluation":{"pairwise":"win","faith_supported":6,"faith_total":6,"faith_pct":100.0}}