{"gene":"CCND2","run_date":"2026-06-09T22:57:17","timeline":{"discoveries":[{"year":2014,"finding":"De novo CCND2 mutations clustered around a GSK-3β phosphorylation residue (Thr) cause megalencephaly-polymicrogyria-polydactyly-hydrocephalus syndrome (MPPH). Mutant CCND2 was resistant to proteasomal degradation in vitro compared to wild-type CCND2, leading to protein stabilization. PI3K-AKT pathway activation (via PIK3CA, PIK3R2, or AKT3 mutations) produced similar CCND2 accumulation. In utero electroporation of mutant CCND2 into embryonic mouse brains produced more proliferating progenitors and a smaller fraction exiting the cell cycle, establishing cyclin D2 stabilization as a unifying mechanism in PI3K-AKT-related megalencephaly.","method":"In vitro proteasomal degradation assay, patient cell analysis, in utero electroporation, immunoblotting","journal":"Nature genetics","confidence":"High","confidence_rationale":"Tier 1-2 / Strong — multiple orthogonal methods (in vitro degradation assay, patient cell analyses, in vivo electroporation), replicated across multiple mutation classes and patient genotypes in one rigorous study","pmids":["24705253"],"is_preprint":false},{"year":2016,"finding":"CCND2 mutations in t(8;21) AML cluster around threonine 280 (Thr280). The Thr280Ala-mutated CCND2 leads to increased phosphorylation of the retinoblastoma protein (Rb), causing significant cell cycle changes and increased proliferation in AML cell lines, consistent with a gain-of-function stabilization mechanism.","method":"Mutant CCND2 expression in AML cell lines, Rb phosphorylation assay, cell cycle analysis, proliferation assay","journal":"Leukemia","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — functional mutagenesis with Rb phosphorylation readout, single lab, two orthogonal methods","pmids":["27843138"],"is_preprint":false},{"year":2008,"finding":"RNAi knockdown of CCND2 inhibits proliferation and is progressively cytotoxic in human myeloma cells, demonstrating that myeloma cells are dependent on CCND2 for survival. Kinetin riboside was identified as an inhibitor of CCND2 trans-activation; it upregulated transcription repressor isoforms of CREM and blocked trans-activation of CCND2 by myeloma oncogenes, causing cell-cycle arrest and tumor cell-selective apoptosis.","method":"RNAi knockdown, cell-based CCND2 trans-activation screening assay, CREM isoform expression analysis, xenograft mouse model","journal":"The Journal of clinical investigation","confidence":"High","confidence_rationale":"Tier 2 / Strong — RNAi functional assay combined with mechanistic identification of CREM repressor isoforms, confirmed in vivo in xenograft model, multiple orthogonal approaches","pmids":["18431519"],"is_preprint":false},{"year":2019,"finding":"STAT3 directly binds the CCND2 promoter to increase CCND2 transcription in colorectal cancer stem cells, placing CCND2 downstream of JAK2/STAT3 signaling. CCND2 expression was required for persistent cancer stem cell growth via maintenance of intact cell cycle progression.","method":"Chromatin immunoprecipitation (ChIP) demonstrating STAT3 binding to CCND2 promoter, loss-of-function assays in patient-derived CRC cells and xenografts","journal":"Journal of experimental & clinical cancer research","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — ChIP plus functional loss-of-function, single lab, two orthogonal methods","pmids":["31511084"],"is_preprint":false},{"year":2010,"finding":"The ETS transcription factor Elf5 directly binds a regulatory segment upstream of the Ccnd2 gene and transcriptionally represses Ccnd2 expression. Loss of Elf5 in mammary epithelial cells and mammary glands leads to upregulation of Ccnd2 with an altered expression pattern in luminal cells.","method":"ChIP-cloning to identify Elf5-bound genomic segments, promoter reporter assay, Elf5-null mammary epithelial cell and gland analysis","journal":"BMC molecular biology","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — ChIP identification of binding site plus promoter reporter plus in vivo Elf5-null validation, single lab","pmids":["20831799"],"is_preprint":false},{"year":2019,"finding":"PICOT (glutaredoxin 3/Grx3) binds chromatin-associated EED (a PRC2 core component) via its PICOT/Grx homology domains. PICOT knockdown reduced H3K27me3 and EED/EZH2 occupancy at the CCND2 gene promoter, resulting in significant increases in CCND2 mRNA and protein in PICOT-deficient T cells, establishing PICOT as a regulator of PRC2-mediated epigenetic silencing of CCND2.","method":"Co-immunoprecipitation of PICOT with chromatin-resident EED, ChIP for H3K27me3/EED/EZH2 at CCND2 promoter, PICOT knockdown with CCND2 expression readout","journal":"Cell death & disease","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — reciprocal Co-IP plus ChIP mechanistic validation, single lab, multiple orthogonal methods","pmids":["31527584"],"is_preprint":false},{"year":2025,"finding":"PRC2.1 (containing accessory protein MTF2), but not PRC2.2 (containing JARID2), promotes H3K27me3 deposition at CpG islands in the CCND1 and CCND2 promoters to repress their expression and oppose G1 progression. Loss of MTF2 leads to upregulation of both CCND1 and CCND2 and resistance to CDK4/6 inhibitor palbociclib.","method":"Chemogenetic screen, genetic epistasis (MTF2 vs JARID2 deletion), H3K27me3 ChIP genome-wide, gene expression analysis, palbociclib sensitivity assay","journal":"eLife","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — ChIP plus genetic epistasis in multiple cell lines, single study but multiple orthogonal methods","pmids":["39903505"],"is_preprint":false},{"year":2016,"finding":"Promoter hypermethylation at the CCND2 gene is closely associated with silenced CCND2 expression in renal cell carcinoma. Treatment with demethylating agent 5-Aza (with or without TSA) restored CCND2 expression in methylated RCC cell lines, establishing promoter methylation as a mechanism of CCND2 silencing.","method":"Methylation-specific PCR (MSP), bisulfite genomic sequencing (BGS), 5-Aza/TSA pharmacological demethylation, mRNA and protein expression analysis","journal":"PloS one","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — MSP, BGS, and pharmacological rescue in cell lines, single lab, multiple orthogonal methods","pmids":["27583477"],"is_preprint":false},{"year":2016,"finding":"lncRNA linc00598 regulates CCND2 transcription by modulating the transcriptional regulatory effect of FoxO1 on the CCND2 promoter. Knockdown of linc00598 induced G0/G1 cell cycle arrest and inhibited proliferation, placing linc00598 as a positive regulator of CCND2 transcription.","method":"Microarray analysis, knockdown experiments, cell cycle analysis, promoter regulation assay involving FoxO1","journal":"Scientific reports","confidence":"Low","confidence_rationale":"Tier 3 / Weak — single lab, promoter modulation inferred but mechanism not fully validated by direct binding assay in abstract","pmids":["27572135"],"is_preprint":false},{"year":2017,"finding":"Overexpression of CCND2 (cyclin D2) in hiPSC-derived cardiomyocytes activates cell cycle markers (Ki67, Aurora B kinase) 3-7 fold and causes proliferation of these normally post-mitotic cells, resulting in approximately tripled engraftment size and improved myocardial repair in a mouse infarction model compared to wild-type CCND2 hiPSC-CMs.","method":"Lentiviral CCND2 overexpression in hiPSC-CMs, cell cycle marker quantification, mouse myocardial infarction model with histological and functional assessments","journal":"Circulation research","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — defined cellular phenotype with cell cycle markers and in vivo functional readout, single lab with multiple orthogonal measurements","pmids":["29018036"],"is_preprint":false},{"year":2023,"finding":"Cardiomyocyte-specific CCND2 modRNA delivery using a synthetic miRNA-gated system (CCND2-cardiomyocyte SMRTs exploiting miR-1 and miR-208 for cardiomyocyte specificity) activated cell cycle progression markers (Ki67, Aurora B kinase) in post-mitotic cardiomyocytes and significantly promoted cardiomyocyte proliferation, reduced infarct size, and improved cardiac performance in both mouse and pig MI models.","method":"Modified mRNA delivery system, cardiomyocyte-specific expression validation, Ki67/Aurora B staining, mouse and pig MI models with functional echocardiography and histology","journal":"Circulation research","confidence":"High","confidence_rationale":"Tier 2 / Strong — cell-type-specific overexpression system validated in two species (mouse and pig), multiple orthogonal functional readouts, replicated across large and small animal models","pmids":["37565345"],"is_preprint":false},{"year":2010,"finding":"MicroRNA let-7a directly binds the 3'UTR of CCND2 mRNA (validated by dual-luciferase reporter assay) and downregulates CCND2 protein expression, causing G1/S cell cycle arrest and inhibiting proliferation in prostate cancer cells.","method":"Dual-luciferase reporter assay, western blotting, cell cycle analysis, xenograft model","journal":"PloS one","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — luciferase reporter assay directly validates 3'UTR binding, western blot for protein change, functional phenotype confirmed in vivo, single lab","pmids":["20418948"],"is_preprint":false},{"year":2011,"finding":"miR-1 directly targets CCND2 (validated by reporter assay) and reduces CCND2 protein to inhibit thyroid carcinoma cell proliferation. An inverse correlation between miR-1 expression and CCND2 protein levels was found in papillary and anaplastic thyroid carcinomas.","method":"Luciferase reporter assay, western blot, functional proliferation and migration assays","journal":"The Journal of clinical endocrinology and metabolism","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — luciferase reporter validation of direct 3'UTR binding plus functional assays, single lab","pmids":["21752897"],"is_preprint":false},{"year":2021,"finding":"CCND2 overexpression activates the MEK/MAPK pathway downstream in breast cancer cells. PRNCR1 lncRNA acts as a ceRNA to sponge miR-377, thereby upregulating CCND2, which in turn activates MEK/MAPK signaling to promote breast cancer growth. Inhibition of the MEK/MAPK pathway with mirdametinib counteracted this effect.","method":"Luciferase reporter assay, RNA pull-down, RIP assay, MEK/MAPK pathway protein analysis by western blot, pharmacological inhibition","journal":"Archives of medical research","confidence":"Low","confidence_rationale":"Tier 3 / Weak — CCND2 link to MEK/MAPK is inferred from pathway analysis and pharmacological inhibition, single lab, pathway placement indirect","pmids":["33608112"],"is_preprint":false},{"year":2021,"finding":"ELAVL1 (HuR) stabilizes CCND2 mRNA and counteracts miR-188-5p-mediated suppression of CCND2, establishing ELAVL1 as an RNA-binding protein that competes with miR-188-5p for CCND2 mRNA binding and stabilizes CCND2 transcript in ovarian cancer cells.","method":"RIP assay, luciferase reporter assay, rescue experiments with HuR or CCND2 overexpression","journal":"Cellular and molecular biology","confidence":"Low","confidence_rationale":"Tier 3 / Weak — single lab, RIP assay and reporter assay without in vitro reconstitution of stabilization mechanism","pmids":["37300687"],"is_preprint":false},{"year":2024,"finding":"ELAVL1 (HuR) directly binds circ_0002331 and CCND2 mRNA (shown by RIP and RNA pull-down), and circ_0002331 promotes CCND2 mRNA stability by interacting with ELAVL1, establishing a mechanism by which circ_0002331 upregulates CCND2 protein in vascular endothelial cells.","method":"RIP assay, RNA pull-down assay, FISH co-localization, western blot for CCND2 protein","journal":"Cardiovascular toxicology","confidence":"Low","confidence_rationale":"Tier 3 / Weak — single lab, RIP and pull-down support interaction but mRNA stability mechanism not directly quantified in abstract","pmids":["38743320"],"is_preprint":false},{"year":2021,"finding":"The granulosa cell TGFBR1-SMAD3 pathway enhances CCND2 promoter activity and upregulates CCND2 expression. ChIP-qPCR demonstrated direct SMAD3 binding at the Ccnd2 promoter, placing CCND2 downstream of TGF-β/SMAD3 signaling in granulosa cell growth during folliculogenesis.","method":"ChIP-qPCR for SMAD3 at Ccnd2 promoter, subcellular localization analysis, functional miR-135a targeting of Ccnd2 3'UTR","journal":"Cells","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — ChIP-qPCR directly demonstrates SMAD3-Ccnd2 promoter binding, combined with functional pathway validation, single lab","pmids":["34440873"],"is_preprint":false},{"year":2019,"finding":"SRSF1 competitively binds the 3'UTR region of CCND2 mRNA with miR-135a, suppressing CCND2 mRNA degradation. SRSF1 overexpression increased CCND2 protein levels and promoted ASMC proliferation in asthma, while SRSF1 knockdown reduced CCND2 and inhibited proliferation.","method":"RNA immunoprecipitation, RNA pull-down assay, dual-luciferase reporter assay, RNA degradation assay, gain/loss-of-function","journal":"Pulmonary pharmacology & therapeutics","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — RNA pull-down and RIP validate direct SRSF1-CCND2 mRNA interaction, RNA degradation assay supports stability mechanism, single lab","pmids":["36280202"],"is_preprint":false},{"year":2023,"finding":"PI3K/AKT inhibitor BEZ-235 induces dephosphorylation of GSK3β, which is an activator of CCND2 proteasomal degradation; BEZ-235 treatment reduced CCND2 protein levels, dephosphorylated Rb, and arrested the cell cycle in G1 in BIA-ALCL cells, confirming PI3K/AKT-GSK3β-mediated regulation of CCND2 protein stability.","method":"BEZ-235 pharmacological treatment, western blot for CCND2/GSK3β phosphorylation/Rb dephosphorylation, cell cycle analysis","journal":"Leukemia research","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — multiple western blot readouts of mechanistic pathway connecting PI3K/AKT to CCND2 stability through GSK3β, consistent with established CCND2 degradation mechanism, single lab","pmids":["37647808"],"is_preprint":false},{"year":2021,"finding":"Proximal (N-terminal region) CCND2 frameshift and stop-gain variants cause microcephaly and simplified cortical gyral pattern, in contrast to distal (C-terminal) CCND2 mutations that cause megalencephaly, suggesting that the two classes of variants produce reciprocal brain growth phenotypes through loss vs. gain of protein function respectively.","method":"Clinical genetic analysis, variant characterization, phenotypic comparison across mutation classes (epistatic inference from human genetics)","journal":"American journal of medical genetics. Part A","confidence":"Low","confidence_rationale":"Tier 3 / Weak — human genetic case series with phenotypic inference; no in vitro functional assays performed to directly test loss-of-function mechanism","pmids":["34087052"],"is_preprint":false}],"current_model":"CCND2 (cyclin D2) is a D-type cyclin that drives G1/S cell cycle progression by activating CDK4/6, leading to Rb phosphorylation; its protein stability is regulated by GSK-3β-mediated phosphorylation followed by proteasomal degradation (a process modulated by PI3K-AKT signaling), and its transcription is controlled by direct promoter binding of STAT3 (activating) and ELF5/PRC2.1 (repressing via H3K27me3), while PICOT promotes PRC2-mediated epigenetic silencing; gain-of-function mutations around the GSK-3β phosphorylation site stabilize cyclin D2 and drive brain overgrowth (MPPH syndrome), whereas loss-of-function proximal variants cause microcephaly, and CCND2 overexpression in post-mitotic cardiomyocytes reactivates their proliferation enabling myocardial repair."},"narrative":{"mechanistic_narrative":"CCND2 (cyclin D2) is a D-type cyclin that drives G1/S cell cycle progression, and its dosage governs the balance between proliferation and cell-cycle exit in contexts ranging from cortical neurogenesis to tumor growth [PMID:24705253, PMID:18431519]. Cyclin D2 activity is read out through retinoblastoma protein (Rb) phosphorylation, with stabilized cyclin D2 increasing Rb phosphorylation to accelerate proliferation [PMID:27843138, PMID:37647808]. Protein abundance is controlled by GSK-3β-dependent phosphorylation that targets cyclin D2 for proteasomal degradation; PI3K/AKT signaling inactivates GSK-3β to stabilize the protein, and pharmacologic PI3K/AKT inhibition restores GSK-3β activity, lowers cyclin D2, dephosphorylates Rb, and arrests cells in G1 [PMID:24705253, PMID:37647808]. De novo mutations clustered around the GSK-3β phosphorylation threonine render cyclin D2 degradation-resistant and stabilized, expanding proliferating neural progenitors and causing megalencephaly-polymicrogyria-polydactyly-hydrocephalus (MPPH) syndrome, while N-terminal loss-of-function variants conversely cause microcephaly — establishing reciprocal brain-growth phenotypes from gain versus loss of cyclin D2 function [PMID:24705253, PMID:34087052]; the same Thr280 gain-of-function stabilization drives proliferation in t(8;21) AML [PMID:27843138]. Transcriptionally, CCND2 is activated by STAT3 binding its promoter downstream of JAK2/STAT3 and by SMAD3 downstream of TGFβR1, and is repressed by the ETS factor ELF5, by promoter DNA hypermethylation, and by PRC2.1 (MTF2)-deposited H3K27me3, a silencing layer modulated by PICOT/glutaredoxin-3 [PMID:31511084, PMID:34440873, PMID:20831799, PMID:27583477, PMID:31527584, PMID:39903505]. Post-transcriptionally, CCND2 is a direct target of multiple microRNAs (let-7a, miR-1) and is stabilized by the RNA-binding protein ELAVL1/HuR and the splicing factor SRSF1 [PMID:20418948, PMID:21752897, PMID:36280202]. Reflecting its proliferative output, CCND2 is essential for myeloma cell survival, and its forced overexpression reactivates the cell cycle in post-mitotic cardiomyocytes to drive myocardial repair [PMID:18431519, PMID:29018036, PMID:37565345].","teleology":[{"year":2008,"claim":"Established that tumor cells can be addicted to CCND2, defining it as a survival dependency and a druggable transcriptional node rather than a passive proliferation marker.","evidence":"RNAi knockdown and a CCND2 trans-activation screen (kinetin riboside / CREM repressor isoforms) in myeloma cells plus xenografts","pmids":["18431519"],"confidence":"High","gaps":["Did not identify the direct transcription factors driving CCND2 trans-activation by myeloma oncogenes","Mechanism of CREM repressor isoform induction by kinetin riboside not resolved"]},{"year":2010,"claim":"Identified ELF5 as a direct transcriptional repressor of Ccnd2, showing CCND2 levels are constrained by lineage-specific ETS factors in epithelial tissue.","evidence":"ChIP-cloning, promoter reporter assay, and Elf5-null mammary epithelium analysis","pmids":["20831799"],"confidence":"Medium","gaps":["Whether ELF5 repression is direct transcriptional or via recruited corepressors not defined","Generalizability beyond mammary lineage untested"]},{"year":2010,"claim":"Defined CCND2 as a direct post-transcriptional target of microRNAs, showing its protein output is set at the 3'UTR independent of transcription.","evidence":"Dual-luciferase 3'UTR reporter, western blot, cell cycle analysis, and xenograft for let-7a (and subsequently miR-1)","pmids":["20418948","21752897"],"confidence":"Medium","gaps":["Relative contribution of miRNA vs transcriptional control in physiological settings unquantified","Did not address combinatorial miRNA regulation"]},{"year":2014,"claim":"Unified PI3K-AKT-related megalencephaly mechanistically by showing degradation-resistant CCND2 stabilization expands neural progenitors, answering how a single cyclin links a signaling pathway to brain overgrowth.","evidence":"In vitro proteasomal degradation assays, patient cell analysis, and in utero electroporation of mutant CCND2 in mouse brain","pmids":["24705253"],"confidence":"High","gaps":["Direct demonstration of GSK-3β phosphorylation of the mutated residue inferred rather than enzymatically reconstituted","Downstream CDK partner engagement in progenitors not detailed"]},{"year":2016,"claim":"Extended the gain-of-function stabilization model to cancer, showing Thr280-region mutant CCND2 drives Rb phosphorylation and proliferation in AML.","evidence":"Mutant CCND2 expression, Rb phosphorylation assay, and cell cycle/proliferation analysis in AML cell lines","pmids":["27843138"],"confidence":"Medium","gaps":["Direct measurement of mutant protein half-life not shown","Single-lab cell-line evidence without patient functional validation"]},{"year":2016,"claim":"Identified DNA promoter hypermethylation as a tumor-suppressive silencing mechanism of CCND2, showing its expression can be epigenetically switched off.","evidence":"Methylation-specific PCR, bisulfite sequencing, and 5-Aza/TSA pharmacological reactivation in renal carcinoma lines","pmids":["27583477"],"confidence":"Medium","gaps":["Causal link between methylation and tumor phenotype correlative","Methyltransferases responsible not identified"]},{"year":2019,"claim":"Placed CCND2 downstream of JAK2/STAT3 via direct promoter binding, defining a transcriptional axis sustaining cancer stem cell proliferation.","evidence":"ChIP of STAT3 at the CCND2 promoter plus loss-of-function in patient-derived colorectal cells and xenografts","pmids":["31511084"],"confidence":"Medium","gaps":["STAT3 cofactors at the promoter not characterized","Single tumor type"]},{"year":2019,"claim":"Established a PRC2/H3K27me3 epigenetic silencing layer at the CCND2 promoter and identified PICOT as a regulator of EED-mediated repression.","evidence":"Reciprocal Co-IP of PICOT with chromatin-resident EED and ChIP for H3K27me3/EED/EZH2 at the CCND2 promoter with knockdown readouts","pmids":["31527584"],"confidence":"Medium","gaps":["How PICOT modulates PRC2 occupancy mechanistically unresolved","Generality beyond T cells untested"]},{"year":2021,"claim":"Resolved the reciprocal brain-growth phenotype by mapping N-terminal loss-of-function variants to microcephaly versus C-terminal gain-of-function variants to megalencephaly.","evidence":"Clinical genetic case series with phenotypic comparison across mutation classes","pmids":["34087052"],"confidence":"Low","gaps":["No in vitro functional assays performed to directly confirm loss-of-function","Variant-specific protein behavior not measured"]},{"year":2021,"claim":"Added TGFβ/SMAD3 as a direct transcriptional activator of Ccnd2 in granulosa cell growth, broadening the activating-signal repertoire upstream of CCND2.","evidence":"ChIP-qPCR for SMAD3 at the Ccnd2 promoter with miR-135a 3'UTR targeting analysis","pmids":["34440873"],"confidence":"Medium","gaps":["SMAD3 cofactor requirements unresolved","Single physiological context"]},{"year":2023,"claim":"Directly connected PI3K/AKT-GSK3β signaling to CCND2 protein stability and Rb phosphorylation, validating the degradation axis pharmacologically.","evidence":"BEZ-235 treatment with western blots of CCND2/GSK3β phosphorylation/Rb and cell cycle analysis in BIA-ALCL cells","pmids":["37647808"],"confidence":"Medium","gaps":["Direct GSK3β phosphorylation site occupancy on CCND2 not mapped","Single cell context"]},{"year":2023,"claim":"Demonstrated that RNA-binding proteins counteract miRNA repression to stabilize CCND2 mRNA, adding a competitive post-transcriptional control layer.","evidence":"RIP, RNA pull-down, luciferase reporter, and RNA degradation assays for SRSF1 (and ELAVL1/HuR) versus miR-135a/miR-188-5p","pmids":["36280202","37300687"],"confidence":"Medium","gaps":["Stabilization mechanism not reconstituted in vitro for HuR","Quantitative contribution to physiological CCND2 levels unclear"]},{"year":2023,"claim":"Showed cardiomyocyte-restricted CCND2 delivery reactivates the cell cycle in post-mitotic cardiomyocytes and drives myocardial repair across species, establishing therapeutic proliferative reactivation.","evidence":"miRNA-gated modRNA (SMRT) delivery with Ki67/Aurora B staining and functional/histologic readouts in mouse and pig MI models (building on hiPSC-CM overexpression)","pmids":["37565345","29018036"],"confidence":"High","gaps":["Long-term safety of sustained cardiomyocyte proliferation not addressed","CDK partner engagement in cardiomyocytes not characterized"]},{"year":2025,"claim":"Defined PRC2.1 (MTF2)- rather than PRC2.2 (JARID2)-specific H3K27me3 deposition at the CCND2/CCND1 promoters as opposing G1 progression and modulating CDK4/6 inhibitor sensitivity.","evidence":"Chemogenetic screen, MTF2 vs JARID2 genetic epistasis, genome-wide H3K27me3 ChIP, and palbociclib sensitivity assays","pmids":["39903505"],"confidence":"Medium","gaps":["How MTF2 selectively targets cyclin D CpG islands not resolved","Direct in vivo relevance to therapy resistance untested"]},{"year":null,"claim":"It remains unresolved how the multilayered transcriptional, epigenetic, and post-transcriptional inputs are integrated to set cyclin D2 dosage in a given cell type, and which CDK partners mediate its proliferative output in non-cancer contexts such as cardiomyocytes.","evidence":"","pmids":[],"confidence":"Low","gaps":["No integrated model of competing regulators","CDK4/6 engagement assumed but not directly demonstrated in most timeline systems","Endogenous GSK-3β phosphorylation kinetics on CCND2 not directly measured"]}],"mechanism_profile":{"molecular_activity":[{"term_id":"GO:0098772","term_label":"molecular function regulator activity","supporting_discovery_ids":[0,1,18]}],"localization":[{"term_id":"GO:0005634","term_label":"nucleus","supporting_discovery_ids":[0,1]}],"pathway":[{"term_id":"R-HSA-1640170","term_label":"Cell Cycle","supporting_discovery_ids":[0,1,2,11,18]},{"term_id":"R-HSA-74160","term_label":"Gene expression (Transcription)","supporting_discovery_ids":[3,4,5,6,7,16]},{"term_id":"R-HSA-8953854","term_label":"Metabolism of RNA","supporting_discovery_ids":[11,12,17]},{"term_id":"R-HSA-1643685","term_label":"Disease","supporting_discovery_ids":[0,1,19]}],"complexes":[],"partners":["RB1","GSK3B","STAT3","SMAD3","EED","ELAVL1","SRSF1"],"other_free_text":[]}},"prefetch_data":{"uniprot":{"accession":"P30279","full_name":"G1/S-specific cyclin-D2","aliases":[],"length_aa":289,"mass_kda":33.1,"function":"Regulatory component of the cyclin D2-CDK4 (DC) complex that phosphorylates and inhibits members of the retinoblastoma (RB) protein family including RB1 and regulates the cell-cycle during G(1)/S transition (PubMed:18827403, PubMed:8114739). Phosphorylation of RB1 allows dissociation of the transcription factor E2F from the RB/E2F complex and the subsequent transcription of E2F target genes which are responsible for the progression through the G(1) phase (PubMed:18827403, PubMed:8114739). Hypophosphorylates RB1 in early G(1) phase (PubMed:18827403, PubMed:8114739). Cyclin D-CDK4 complexes are major integrators of various mitogenenic and antimitogenic signals (PubMed:18827403, PubMed:8114739)","subcellular_location":"Cytoplasm","url":"https://www.uniprot.org/uniprotkb/P30279/entry"},"depmap":{"release":"DepMap","has_data":true,"is_common_essential":false,"resolved_as":"","url":"https://depmap.org/portal/gene/CCND2","classification":"Not Classified","n_dependent_lines":81,"n_total_lines":1208,"dependency_fraction":0.06705298013245033},"opencell":{"profiled":false,"resolved_as":"","ensg_id":"","cell_line_id":"","localizations":[],"interactors":[],"url":"https://opencell.sf.czbiohub.org/search/CCND2","total_profiled":1310},"omim":[{"mim_id":"619008","title":"LONG INTERGENIC NONCODING RNA 598; LINC00598","url":"https://www.omim.org/entry/619008"},{"mim_id":"615938","title":"MEGALENCEPHALY-POLYMICROGYRIA-POLYDACTYLY-HYDROCEPHALUS SYNDROME 3; MPPH3","url":"https://www.omim.org/entry/615938"},{"mim_id":"615672","title":"MICRO RNA 497; MIR497","url":"https://www.omim.org/entry/615672"},{"mim_id":"615480","title":"BLADDER CANCER-ASSOCIATED TRANSCRIPT 1, NONCODING; BLACAT1","url":"https://www.omim.org/entry/615480"},{"mim_id":"614597","title":"MICRO RNA 302B; MIR302B","url":"https://www.omim.org/entry/614597"}],"hpa":{"profiled":true,"resolved_as":"","reliability":"Enhanced","locations":[{"location":"Nucleoplasm","reliability":"Enhanced"}],"tissue_specificity":"Tissue enhanced","tissue_distribution":"Detected in many","driving_tissues":[{"tissue":"heart muscle","ntpm":27.8}],"url":"https://www.proteinatlas.org/search/CCND2"},"hgnc":{"alias_symbol":[],"prev_symbol":[]},"alphafold":{"accession":"P30279","domains":[{"cath_id":"1.10.472.10","chopping":"39-146","consensus_level":"high","plddt":96.8714,"start":39,"end":146},{"cath_id":"1.10.472.10","chopping":"155-268","consensus_level":"high","plddt":88.5931,"start":155,"end":268}],"viewer_url":"https://alphafold.ebi.ac.uk/entry/P30279","model_url":"https://alphafold.ebi.ac.uk/files/AF-P30279-F1-model_v6.cif","pae_url":"https://alphafold.ebi.ac.uk/files/AF-P30279-F1-predicted_aligned_error_v6.png","plddt_mean":87.94},"mouse_models":{"mgi_url":"https://www.informatics.jax.org/marker/summary?nomen=CCND2","jax_strain_url":"https://www.jax.org/strain/search?query=CCND2"},"sequence":{"accession":"P30279","fasta_url":"https://rest.uniprot.org/uniprotkb/P30279.fasta","uniprot_url":"https://www.uniprot.org/uniprotkb/P30279/entry","alphafold_viewer_url":"https://alphafold.ebi.ac.uk/entry/P30279"}},"corpus_meta":[{"pmid":"31511084","id":"PMC_31511084","title":"The 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sciences","url":"https://pubmed.ncbi.nlm.nih.gov/37866807","citation_count":7,"is_preprint":false},{"pmid":"31527584","id":"PMC_31527584","title":"PICOT binding to chromatin-associated EED negatively regulates cyclin D2 expression by increasing H3K27me3 at the CCND2 gene promoter.","date":"2019","source":"Cell death & disease","url":"https://pubmed.ncbi.nlm.nih.gov/31527584","citation_count":7,"is_preprint":false},{"pmid":"9530346","id":"PMC_9530346","title":"Genomic amplification of CCND2 is rare in non-Hodgkin lymphomas.","date":"1998","source":"Cancer genetics and cytogenetics","url":"https://pubmed.ncbi.nlm.nih.gov/9530346","citation_count":7,"is_preprint":false},{"pmid":"36280202","id":"PMC_36280202","title":"SRSF1 promotes ASMC proliferation in asthma by competitively binding CCND2 with miRNA-135a.","date":"2022","source":"Pulmonary pharmacology & therapeutics","url":"https://pubmed.ncbi.nlm.nih.gov/36280202","citation_count":6,"is_preprint":false},{"pmid":"36694220","id":"PMC_36694220","title":"CCND2 and miR-206 as potential biomarkers in the clinical diagnosis of thyroid carcinoma by fine-needle aspiration cytology.","date":"2023","source":"World journal of surgical oncology","url":"https://pubmed.ncbi.nlm.nih.gov/36694220","citation_count":6,"is_preprint":false},{"pmid":"24743557","id":"PMC_24743557","title":"Association between the polymorphism rs3217927 of CCND2 and the risk of childhood acute lymphoblastic leukemia in a Chinese population.","date":"2014","source":"PloS one","url":"https://pubmed.ncbi.nlm.nih.gov/24743557","citation_count":6,"is_preprint":false},{"pmid":"35117490","id":"PMC_35117490","title":"LncRNA XIST acts as a ceRNA sponging miR-185-5p to modulate pancreatic cancer cell proliferation via targeting CCND2.","date":"2020","source":"Translational cancer research","url":"https://pubmed.ncbi.nlm.nih.gov/35117490","citation_count":6,"is_preprint":false},{"pmid":"21559724","id":"PMC_21559724","title":"Coamplification in human breast-tumors and physical linkage at chromosomal band 12p13, of ccnd2 and fgf6 genes.","date":"1994","source":"International journal of oncology","url":"https://pubmed.ncbi.nlm.nih.gov/21559724","citation_count":6,"is_preprint":false},{"pmid":"39903505","id":"PMC_39903505","title":"The PRC2.1 subcomplex opposes G1 progression through regulation of CCND1 and CCND2.","date":"2025","source":"eLife","url":"https://pubmed.ncbi.nlm.nih.gov/39903505","citation_count":5,"is_preprint":false},{"pmid":"34801563","id":"PMC_34801563","title":"Reduced expression of microRNA-432-5p by DNA methyltransferase 3B leads to development of colorectal cancer through upregulation of CCND2.","date":"2021","source":"Experimental cell research","url":"https://pubmed.ncbi.nlm.nih.gov/34801563","citation_count":5,"is_preprint":false},{"pmid":"35786622","id":"PMC_35786622","title":"Interaction of CCND2, CDKN1A, and POLD3 Variants in Mexican Patients with Colorectal Cancer.","date":"2022","source":"The Turkish journal of gastroenterology : the official journal of Turkish Society of Gastroenterology","url":"https://pubmed.ncbi.nlm.nih.gov/35786622","citation_count":5,"is_preprint":false},{"pmid":"35616759","id":"PMC_35616759","title":"Gene identification and functional analysis of a D-type cyclin (CCND2) in freshwater pearl mussel (Hyriopsis cumingii).","date":"2022","source":"Molecular biology reports","url":"https://pubmed.ncbi.nlm.nih.gov/35616759","citation_count":5,"is_preprint":false},{"pmid":"37300687","id":"PMC_37300687","title":"MiR-188-5p inhibits cell proliferation and migration in ovarian cancer via competing for CCND2 with ELAVL1.","date":"2023","source":"Cellular and molecular biology (Noisy-le-Grand, France)","url":"https://pubmed.ncbi.nlm.nih.gov/37300687","citation_count":4,"is_preprint":false},{"pmid":"31938243","id":"PMC_31938243","title":"LncRNA CCND2-AS1 is up-regulated and regulates proliferation, migration, and invasion in breast cancer.","date":"2018","source":"International journal of clinical and experimental pathology","url":"https://pubmed.ncbi.nlm.nih.gov/31938243","citation_count":4,"is_preprint":false},{"pmid":"37647808","id":"PMC_37647808","title":"PI3K/AKT inhibitor BEZ-235 targets CCND2 and induces G1 arrest in breast implant-associated anaplastic large cell lymphoma.","date":"2023","source":"Leukemia research","url":"https://pubmed.ncbi.nlm.nih.gov/37647808","citation_count":4,"is_preprint":false},{"pmid":"38743320","id":"PMC_38743320","title":"Circ_0002331 Interacts with ELAVL1 to Improve ox-LDL-Induced Vascular Endothelial Cell Dysfunction via Regulating CCND2 mRNA Stability.","date":"2024","source":"Cardiovascular toxicology","url":"https://pubmed.ncbi.nlm.nih.gov/38743320","citation_count":4,"is_preprint":false},{"pmid":"32607313","id":"PMC_32607313","title":"Aberrant methylation-mediated downregulation of lncRNA CCND2 AS1 promotes cell proliferation in cervical cancer.","date":"2020","source":"Journal of biological research (Thessalonike, Greece)","url":"https://pubmed.ncbi.nlm.nih.gov/32607313","citation_count":4,"is_preprint":false}],"cost":{"stage1":{"model":"claude-sonnet-4-6","input_tokens":54081,"output_tokens":5282,"usd":0.120736,"stage1_stop_reason":"end_turn"},"stage2":{"model":"claude-opus-4-8","input_tokens":13576,"output_tokens":4723,"usd":0.092978,"stage2_stop_reason":"end_turn"},"total_usd":0.213714,"stage1_batch_id":"msgbatch_01ACAxJQabDsht39JXeWG22d","stage2_batch_id":"msgbatch_01QEU22A9U5sbPTgsMzTmvSf","note":"batch pricing = 50% of standard"},"stage1_raw":"```json\n{\n  \"discoveries\": [\n    {\n      \"year\": 2014,\n      \"finding\": \"De novo CCND2 mutations clustered around a GSK-3β phosphorylation residue (Thr) cause megalencephaly-polymicrogyria-polydactyly-hydrocephalus syndrome (MPPH). Mutant CCND2 was resistant to proteasomal degradation in vitro compared to wild-type CCND2, leading to protein stabilization. PI3K-AKT pathway activation (via PIK3CA, PIK3R2, or AKT3 mutations) produced similar CCND2 accumulation. In utero electroporation of mutant CCND2 into embryonic mouse brains produced more proliferating progenitors and a smaller fraction exiting the cell cycle, establishing cyclin D2 stabilization as a unifying mechanism in PI3K-AKT-related megalencephaly.\",\n      \"method\": \"In vitro proteasomal degradation assay, patient cell analysis, in utero electroporation, immunoblotting\",\n      \"journal\": \"Nature genetics\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1-2 / Strong — multiple orthogonal methods (in vitro degradation assay, patient cell analyses, in vivo electroporation), replicated across multiple mutation classes and patient genotypes in one rigorous study\",\n      \"pmids\": [\"24705253\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2016,\n      \"finding\": \"CCND2 mutations in t(8;21) AML cluster around threonine 280 (Thr280). The Thr280Ala-mutated CCND2 leads to increased phosphorylation of the retinoblastoma protein (Rb), causing significant cell cycle changes and increased proliferation in AML cell lines, consistent with a gain-of-function stabilization mechanism.\",\n      \"method\": \"Mutant CCND2 expression in AML cell lines, Rb phosphorylation assay, cell cycle analysis, proliferation assay\",\n      \"journal\": \"Leukemia\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — functional mutagenesis with Rb phosphorylation readout, single lab, two orthogonal methods\",\n      \"pmids\": [\"27843138\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2008,\n      \"finding\": \"RNAi knockdown of CCND2 inhibits proliferation and is progressively cytotoxic in human myeloma cells, demonstrating that myeloma cells are dependent on CCND2 for survival. Kinetin riboside was identified as an inhibitor of CCND2 trans-activation; it upregulated transcription repressor isoforms of CREM and blocked trans-activation of CCND2 by myeloma oncogenes, causing cell-cycle arrest and tumor cell-selective apoptosis.\",\n      \"method\": \"RNAi knockdown, cell-based CCND2 trans-activation screening assay, CREM isoform expression analysis, xenograft mouse model\",\n      \"journal\": \"The Journal of clinical investigation\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — RNAi functional assay combined with mechanistic identification of CREM repressor isoforms, confirmed in vivo in xenograft model, multiple orthogonal approaches\",\n      \"pmids\": [\"18431519\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2019,\n      \"finding\": \"STAT3 directly binds the CCND2 promoter to increase CCND2 transcription in colorectal cancer stem cells, placing CCND2 downstream of JAK2/STAT3 signaling. CCND2 expression was required for persistent cancer stem cell growth via maintenance of intact cell cycle progression.\",\n      \"method\": \"Chromatin immunoprecipitation (ChIP) demonstrating STAT3 binding to CCND2 promoter, loss-of-function assays in patient-derived CRC cells and xenografts\",\n      \"journal\": \"Journal of experimental & clinical cancer research\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — ChIP plus functional loss-of-function, single lab, two orthogonal methods\",\n      \"pmids\": [\"31511084\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2010,\n      \"finding\": \"The ETS transcription factor Elf5 directly binds a regulatory segment upstream of the Ccnd2 gene and transcriptionally represses Ccnd2 expression. Loss of Elf5 in mammary epithelial cells and mammary glands leads to upregulation of Ccnd2 with an altered expression pattern in luminal cells.\",\n      \"method\": \"ChIP-cloning to identify Elf5-bound genomic segments, promoter reporter assay, Elf5-null mammary epithelial cell and gland analysis\",\n      \"journal\": \"BMC molecular biology\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — ChIP identification of binding site plus promoter reporter plus in vivo Elf5-null validation, single lab\",\n      \"pmids\": [\"20831799\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2019,\n      \"finding\": \"PICOT (glutaredoxin 3/Grx3) binds chromatin-associated EED (a PRC2 core component) via its PICOT/Grx homology domains. PICOT knockdown reduced H3K27me3 and EED/EZH2 occupancy at the CCND2 gene promoter, resulting in significant increases in CCND2 mRNA and protein in PICOT-deficient T cells, establishing PICOT as a regulator of PRC2-mediated epigenetic silencing of CCND2.\",\n      \"method\": \"Co-immunoprecipitation of PICOT with chromatin-resident EED, ChIP for H3K27me3/EED/EZH2 at CCND2 promoter, PICOT knockdown with CCND2 expression readout\",\n      \"journal\": \"Cell death & disease\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — reciprocal Co-IP plus ChIP mechanistic validation, single lab, multiple orthogonal methods\",\n      \"pmids\": [\"31527584\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2025,\n      \"finding\": \"PRC2.1 (containing accessory protein MTF2), but not PRC2.2 (containing JARID2), promotes H3K27me3 deposition at CpG islands in the CCND1 and CCND2 promoters to repress their expression and oppose G1 progression. Loss of MTF2 leads to upregulation of both CCND1 and CCND2 and resistance to CDK4/6 inhibitor palbociclib.\",\n      \"method\": \"Chemogenetic screen, genetic epistasis (MTF2 vs JARID2 deletion), H3K27me3 ChIP genome-wide, gene expression analysis, palbociclib sensitivity assay\",\n      \"journal\": \"eLife\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — ChIP plus genetic epistasis in multiple cell lines, single study but multiple orthogonal methods\",\n      \"pmids\": [\"39903505\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2016,\n      \"finding\": \"Promoter hypermethylation at the CCND2 gene is closely associated with silenced CCND2 expression in renal cell carcinoma. Treatment with demethylating agent 5-Aza (with or without TSA) restored CCND2 expression in methylated RCC cell lines, establishing promoter methylation as a mechanism of CCND2 silencing.\",\n      \"method\": \"Methylation-specific PCR (MSP), bisulfite genomic sequencing (BGS), 5-Aza/TSA pharmacological demethylation, mRNA and protein expression analysis\",\n      \"journal\": \"PloS one\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — MSP, BGS, and pharmacological rescue in cell lines, single lab, multiple orthogonal methods\",\n      \"pmids\": [\"27583477\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2016,\n      \"finding\": \"lncRNA linc00598 regulates CCND2 transcription by modulating the transcriptional regulatory effect of FoxO1 on the CCND2 promoter. Knockdown of linc00598 induced G0/G1 cell cycle arrest and inhibited proliferation, placing linc00598 as a positive regulator of CCND2 transcription.\",\n      \"method\": \"Microarray analysis, knockdown experiments, cell cycle analysis, promoter regulation assay involving FoxO1\",\n      \"journal\": \"Scientific reports\",\n      \"confidence\": \"Low\",\n      \"confidence_rationale\": \"Tier 3 / Weak — single lab, promoter modulation inferred but mechanism not fully validated by direct binding assay in abstract\",\n      \"pmids\": [\"27572135\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2017,\n      \"finding\": \"Overexpression of CCND2 (cyclin D2) in hiPSC-derived cardiomyocytes activates cell cycle markers (Ki67, Aurora B kinase) 3-7 fold and causes proliferation of these normally post-mitotic cells, resulting in approximately tripled engraftment size and improved myocardial repair in a mouse infarction model compared to wild-type CCND2 hiPSC-CMs.\",\n      \"method\": \"Lentiviral CCND2 overexpression in hiPSC-CMs, cell cycle marker quantification, mouse myocardial infarction model with histological and functional assessments\",\n      \"journal\": \"Circulation research\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — defined cellular phenotype with cell cycle markers and in vivo functional readout, single lab with multiple orthogonal measurements\",\n      \"pmids\": [\"29018036\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2023,\n      \"finding\": \"Cardiomyocyte-specific CCND2 modRNA delivery using a synthetic miRNA-gated system (CCND2-cardiomyocyte SMRTs exploiting miR-1 and miR-208 for cardiomyocyte specificity) activated cell cycle progression markers (Ki67, Aurora B kinase) in post-mitotic cardiomyocytes and significantly promoted cardiomyocyte proliferation, reduced infarct size, and improved cardiac performance in both mouse and pig MI models.\",\n      \"method\": \"Modified mRNA delivery system, cardiomyocyte-specific expression validation, Ki67/Aurora B staining, mouse and pig MI models with functional echocardiography and histology\",\n      \"journal\": \"Circulation research\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — cell-type-specific overexpression system validated in two species (mouse and pig), multiple orthogonal functional readouts, replicated across large and small animal models\",\n      \"pmids\": [\"37565345\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2010,\n      \"finding\": \"MicroRNA let-7a directly binds the 3'UTR of CCND2 mRNA (validated by dual-luciferase reporter assay) and downregulates CCND2 protein expression, causing G1/S cell cycle arrest and inhibiting proliferation in prostate cancer cells.\",\n      \"method\": \"Dual-luciferase reporter assay, western blotting, cell cycle analysis, xenograft model\",\n      \"journal\": \"PloS one\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — luciferase reporter assay directly validates 3'UTR binding, western blot for protein change, functional phenotype confirmed in vivo, single lab\",\n      \"pmids\": [\"20418948\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2011,\n      \"finding\": \"miR-1 directly targets CCND2 (validated by reporter assay) and reduces CCND2 protein to inhibit thyroid carcinoma cell proliferation. An inverse correlation between miR-1 expression and CCND2 protein levels was found in papillary and anaplastic thyroid carcinomas.\",\n      \"method\": \"Luciferase reporter assay, western blot, functional proliferation and migration assays\",\n      \"journal\": \"The Journal of clinical endocrinology and metabolism\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — luciferase reporter validation of direct 3'UTR binding plus functional assays, single lab\",\n      \"pmids\": [\"21752897\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2021,\n      \"finding\": \"CCND2 overexpression activates the MEK/MAPK pathway downstream in breast cancer cells. PRNCR1 lncRNA acts as a ceRNA to sponge miR-377, thereby upregulating CCND2, which in turn activates MEK/MAPK signaling to promote breast cancer growth. Inhibition of the MEK/MAPK pathway with mirdametinib counteracted this effect.\",\n      \"method\": \"Luciferase reporter assay, RNA pull-down, RIP assay, MEK/MAPK pathway protein analysis by western blot, pharmacological inhibition\",\n      \"journal\": \"Archives of medical research\",\n      \"confidence\": \"Low\",\n      \"confidence_rationale\": \"Tier 3 / Weak — CCND2 link to MEK/MAPK is inferred from pathway analysis and pharmacological inhibition, single lab, pathway placement indirect\",\n      \"pmids\": [\"33608112\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2021,\n      \"finding\": \"ELAVL1 (HuR) stabilizes CCND2 mRNA and counteracts miR-188-5p-mediated suppression of CCND2, establishing ELAVL1 as an RNA-binding protein that competes with miR-188-5p for CCND2 mRNA binding and stabilizes CCND2 transcript in ovarian cancer cells.\",\n      \"method\": \"RIP assay, luciferase reporter assay, rescue experiments with HuR or CCND2 overexpression\",\n      \"journal\": \"Cellular and molecular biology\",\n      \"confidence\": \"Low\",\n      \"confidence_rationale\": \"Tier 3 / Weak — single lab, RIP assay and reporter assay without in vitro reconstitution of stabilization mechanism\",\n      \"pmids\": [\"37300687\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2024,\n      \"finding\": \"ELAVL1 (HuR) directly binds circ_0002331 and CCND2 mRNA (shown by RIP and RNA pull-down), and circ_0002331 promotes CCND2 mRNA stability by interacting with ELAVL1, establishing a mechanism by which circ_0002331 upregulates CCND2 protein in vascular endothelial cells.\",\n      \"method\": \"RIP assay, RNA pull-down assay, FISH co-localization, western blot for CCND2 protein\",\n      \"journal\": \"Cardiovascular toxicology\",\n      \"confidence\": \"Low\",\n      \"confidence_rationale\": \"Tier 3 / Weak — single lab, RIP and pull-down support interaction but mRNA stability mechanism not directly quantified in abstract\",\n      \"pmids\": [\"38743320\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2021,\n      \"finding\": \"The granulosa cell TGFBR1-SMAD3 pathway enhances CCND2 promoter activity and upregulates CCND2 expression. ChIP-qPCR demonstrated direct SMAD3 binding at the Ccnd2 promoter, placing CCND2 downstream of TGF-β/SMAD3 signaling in granulosa cell growth during folliculogenesis.\",\n      \"method\": \"ChIP-qPCR for SMAD3 at Ccnd2 promoter, subcellular localization analysis, functional miR-135a targeting of Ccnd2 3'UTR\",\n      \"journal\": \"Cells\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — ChIP-qPCR directly demonstrates SMAD3-Ccnd2 promoter binding, combined with functional pathway validation, single lab\",\n      \"pmids\": [\"34440873\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2019,\n      \"finding\": \"SRSF1 competitively binds the 3'UTR region of CCND2 mRNA with miR-135a, suppressing CCND2 mRNA degradation. SRSF1 overexpression increased CCND2 protein levels and promoted ASMC proliferation in asthma, while SRSF1 knockdown reduced CCND2 and inhibited proliferation.\",\n      \"method\": \"RNA immunoprecipitation, RNA pull-down assay, dual-luciferase reporter assay, RNA degradation assay, gain/loss-of-function\",\n      \"journal\": \"Pulmonary pharmacology & therapeutics\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — RNA pull-down and RIP validate direct SRSF1-CCND2 mRNA interaction, RNA degradation assay supports stability mechanism, single lab\",\n      \"pmids\": [\"36280202\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2023,\n      \"finding\": \"PI3K/AKT inhibitor BEZ-235 induces dephosphorylation of GSK3β, which is an activator of CCND2 proteasomal degradation; BEZ-235 treatment reduced CCND2 protein levels, dephosphorylated Rb, and arrested the cell cycle in G1 in BIA-ALCL cells, confirming PI3K/AKT-GSK3β-mediated regulation of CCND2 protein stability.\",\n      \"method\": \"BEZ-235 pharmacological treatment, western blot for CCND2/GSK3β phosphorylation/Rb dephosphorylation, cell cycle analysis\",\n      \"journal\": \"Leukemia research\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — multiple western blot readouts of mechanistic pathway connecting PI3K/AKT to CCND2 stability through GSK3β, consistent with established CCND2 degradation mechanism, single lab\",\n      \"pmids\": [\"37647808\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2021,\n      \"finding\": \"Proximal (N-terminal region) CCND2 frameshift and stop-gain variants cause microcephaly and simplified cortical gyral pattern, in contrast to distal (C-terminal) CCND2 mutations that cause megalencephaly, suggesting that the two classes of variants produce reciprocal brain growth phenotypes through loss vs. gain of protein function respectively.\",\n      \"method\": \"Clinical genetic analysis, variant characterization, phenotypic comparison across mutation classes (epistatic inference from human genetics)\",\n      \"journal\": \"American journal of medical genetics. Part A\",\n      \"confidence\": \"Low\",\n      \"confidence_rationale\": \"Tier 3 / Weak — human genetic case series with phenotypic inference; no in vitro functional assays performed to directly test loss-of-function mechanism\",\n      \"pmids\": [\"34087052\"],\n      \"is_preprint\": false\n    }\n  ],\n  \"current_model\": \"CCND2 (cyclin D2) is a D-type cyclin that drives G1/S cell cycle progression by activating CDK4/6, leading to Rb phosphorylation; its protein stability is regulated by GSK-3β-mediated phosphorylation followed by proteasomal degradation (a process modulated by PI3K-AKT signaling), and its transcription is controlled by direct promoter binding of STAT3 (activating) and ELF5/PRC2.1 (repressing via H3K27me3), while PICOT promotes PRC2-mediated epigenetic silencing; gain-of-function mutations around the GSK-3β phosphorylation site stabilize cyclin D2 and drive brain overgrowth (MPPH syndrome), whereas loss-of-function proximal variants cause microcephaly, and CCND2 overexpression in post-mitotic cardiomyocytes reactivates their proliferation enabling myocardial repair.\"\n}\n```","stage2_raw":"{\n  \"mechanistic_narrative\": \"CCND2 (cyclin D2) is a D-type cyclin that drives G1/S cell cycle progression, and its dosage governs the balance between proliferation and cell-cycle exit in contexts ranging from cortical neurogenesis to tumor growth [#0, #2]. Cyclin D2 activity is read out through retinoblastoma protein (Rb) phosphorylation, with stabilized cyclin D2 increasing Rb phosphorylation to accelerate proliferation [#1, #18]. Protein abundance is controlled by GSK-3\\u03b2-dependent phosphorylation that targets cyclin D2 for proteasomal degradation; PI3K/AKT signaling inactivates GSK-3\\u03b2 to stabilize the protein, and pharmacologic PI3K/AKT inhibition restores GSK-3\\u03b2 activity, lowers cyclin D2, dephosphorylates Rb, and arrests cells in G1 [#0, #18]. De novo mutations clustered around the GSK-3\\u03b2 phosphorylation threonine render cyclin D2 degradation-resistant and stabilized, expanding proliferating neural progenitors and causing megalencephaly-polymicrogyria-polydactyly-hydrocephalus (MPPH) syndrome, while N-terminal loss-of-function variants conversely cause microcephaly \\u2014 establishing reciprocal brain-growth phenotypes from gain versus loss of cyclin D2 function [#0, #19]; the same Thr280 gain-of-function stabilization drives proliferation in t(8;21) AML [#1]. Transcriptionally, CCND2 is activated by STAT3 binding its promoter downstream of JAK2/STAT3 and by SMAD3 downstream of TGF\\u03b2R1, and is repressed by the ETS factor ELF5, by promoter DNA hypermethylation, and by PRC2.1 (MTF2)-deposited H3K27me3, a silencing layer modulated by PICOT/glutaredoxin-3 [#3, #16, #4, #7, #5, #6]. Post-transcriptionally, CCND2 is a direct target of multiple microRNAs (let-7a, miR-1) and is stabilized by the RNA-binding protein ELAVL1/HuR and the splicing factor SRSF1 [#11, #12, #17]. Reflecting its proliferative output, CCND2 is essential for myeloma cell survival, and its forced overexpression reactivates the cell cycle in post-mitotic cardiomyocytes to drive myocardial repair [#2, #9, #10].\",\n  \"teleology\": [\n    {\n      \"year\": 2008,\n      \"claim\": \"Established that tumor cells can be addicted to CCND2, defining it as a survival dependency and a druggable transcriptional node rather than a passive proliferation marker.\",\n      \"evidence\": \"RNAi knockdown and a CCND2 trans-activation screen (kinetin riboside / CREM repressor isoforms) in myeloma cells plus xenografts\",\n      \"pmids\": [\"18431519\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Did not identify the direct transcription factors driving CCND2 trans-activation by myeloma oncogenes\", \"Mechanism of CREM repressor isoform induction by kinetin riboside not resolved\"]\n    },\n    {\n      \"year\": 2010,\n      \"claim\": \"Identified ELF5 as a direct transcriptional repressor of Ccnd2, showing CCND2 levels are constrained by lineage-specific ETS factors in epithelial tissue.\",\n      \"evidence\": \"ChIP-cloning, promoter reporter assay, and Elf5-null mammary epithelium analysis\",\n      \"pmids\": [\"20831799\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Whether ELF5 repression is direct transcriptional or via recruited corepressors not defined\", \"Generalizability beyond mammary lineage untested\"]\n    },\n    {\n      \"year\": 2010,\n      \"claim\": \"Defined CCND2 as a direct post-transcriptional target of microRNAs, showing its protein output is set at the 3'UTR independent of transcription.\",\n      \"evidence\": \"Dual-luciferase 3'UTR reporter, western blot, cell cycle analysis, and xenograft for let-7a (and subsequently miR-1)\",\n      \"pmids\": [\"20418948\", \"21752897\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Relative contribution of miRNA vs transcriptional control in physiological settings unquantified\", \"Did not address combinatorial miRNA regulation\"]\n    },\n    {\n      \"year\": 2014,\n      \"claim\": \"Unified PI3K-AKT-related megalencephaly mechanistically by showing degradation-resistant CCND2 stabilization expands neural progenitors, answering how a single cyclin links a signaling pathway to brain overgrowth.\",\n      \"evidence\": \"In vitro proteasomal degradation assays, patient cell analysis, and in utero electroporation of mutant CCND2 in mouse brain\",\n      \"pmids\": [\"24705253\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Direct demonstration of GSK-3\\u03b2 phosphorylation of the mutated residue inferred rather than enzymatically reconstituted\", \"Downstream CDK partner engagement in progenitors not detailed\"]\n    },\n    {\n      \"year\": 2016,\n      \"claim\": \"Extended the gain-of-function stabilization model to cancer, showing Thr280-region mutant CCND2 drives Rb phosphorylation and proliferation in AML.\",\n      \"evidence\": \"Mutant CCND2 expression, Rb phosphorylation assay, and cell cycle/proliferation analysis in AML cell lines\",\n      \"pmids\": [\"27843138\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Direct measurement of mutant protein half-life not shown\", \"Single-lab cell-line evidence without patient functional validation\"]\n    },\n    {\n      \"year\": 2016,\n      \"claim\": \"Identified DNA promoter hypermethylation as a tumor-suppressive silencing mechanism of CCND2, showing its expression can be epigenetically switched off.\",\n      \"evidence\": \"Methylation-specific PCR, bisulfite sequencing, and 5-Aza/TSA pharmacological reactivation in renal carcinoma lines\",\n      \"pmids\": [\"27583477\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Causal link between methylation and tumor phenotype correlative\", \"Methyltransferases responsible not identified\"]\n    },\n    {\n      \"year\": 2019,\n      \"claim\": \"Placed CCND2 downstream of JAK2/STAT3 via direct promoter binding, defining a transcriptional axis sustaining cancer stem cell proliferation.\",\n      \"evidence\": \"ChIP of STAT3 at the CCND2 promoter plus loss-of-function in patient-derived colorectal cells and xenografts\",\n      \"pmids\": [\"31511084\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"STAT3 cofactors at the promoter not characterized\", \"Single tumor type\"]\n    },\n    {\n      \"year\": 2019,\n      \"claim\": \"Established a PRC2/H3K27me3 epigenetic silencing layer at the CCND2 promoter and identified PICOT as a regulator of EED-mediated repression.\",\n      \"evidence\": \"Reciprocal Co-IP of PICOT with chromatin-resident EED and ChIP for H3K27me3/EED/EZH2 at the CCND2 promoter with knockdown readouts\",\n      \"pmids\": [\"31527584\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"How PICOT modulates PRC2 occupancy mechanistically unresolved\", \"Generality beyond T cells untested\"]\n    },\n    {\n      \"year\": 2021,\n      \"claim\": \"Resolved the reciprocal brain-growth phenotype by mapping N-terminal loss-of-function variants to microcephaly versus C-terminal gain-of-function variants to megalencephaly.\",\n      \"evidence\": \"Clinical genetic case series with phenotypic comparison across mutation classes\",\n      \"pmids\": [\"34087052\"],\n      \"confidence\": \"Low\",\n      \"gaps\": [\"No in vitro functional assays performed to directly confirm loss-of-function\", \"Variant-specific protein behavior not measured\"]\n    },\n    {\n      \"year\": 2021,\n      \"claim\": \"Added TGF\\u03b2/SMAD3 as a direct transcriptional activator of Ccnd2 in granulosa cell growth, broadening the activating-signal repertoire upstream of CCND2.\",\n      \"evidence\": \"ChIP-qPCR for SMAD3 at the Ccnd2 promoter with miR-135a 3'UTR targeting analysis\",\n      \"pmids\": [\"34440873\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"SMAD3 cofactor requirements unresolved\", \"Single physiological context\"]\n    },\n    {\n      \"year\": 2023,\n      \"claim\": \"Directly connected PI3K/AKT-GSK3\\u03b2 signaling to CCND2 protein stability and Rb phosphorylation, validating the degradation axis pharmacologically.\",\n      \"evidence\": \"BEZ-235 treatment with western blots of CCND2/GSK3\\u03b2 phosphorylation/Rb and cell cycle analysis in BIA-ALCL cells\",\n      \"pmids\": [\"37647808\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Direct GSK3\\u03b2 phosphorylation site occupancy on CCND2 not mapped\", \"Single cell context\"]\n    },\n    {\n      \"year\": 2023,\n      \"claim\": \"Demonstrated that RNA-binding proteins counteract miRNA repression to stabilize CCND2 mRNA, adding a competitive post-transcriptional control layer.\",\n      \"evidence\": \"RIP, RNA pull-down, luciferase reporter, and RNA degradation assays for SRSF1 (and ELAVL1/HuR) versus miR-135a/miR-188-5p\",\n      \"pmids\": [\"36280202\", \"37300687\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Stabilization mechanism not reconstituted in vitro for HuR\", \"Quantitative contribution to physiological CCND2 levels unclear\"]\n    },\n    {\n      \"year\": 2023,\n      \"claim\": \"Showed cardiomyocyte-restricted CCND2 delivery reactivates the cell cycle in post-mitotic cardiomyocytes and drives myocardial repair across species, establishing therapeutic proliferative reactivation.\",\n      \"evidence\": \"miRNA-gated modRNA (SMRT) delivery with Ki67/Aurora B staining and functional/histologic readouts in mouse and pig MI models (building on hiPSC-CM overexpression)\",\n      \"pmids\": [\"37565345\", \"29018036\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Long-term safety of sustained cardiomyocyte proliferation not addressed\", \"CDK partner engagement in cardiomyocytes not characterized\"]\n    },\n    {\n      \"year\": 2025,\n      \"claim\": \"Defined PRC2.1 (MTF2)- rather than PRC2.2 (JARID2)-specific H3K27me3 deposition at the CCND2/CCND1 promoters as opposing G1 progression and modulating CDK4/6 inhibitor sensitivity.\",\n      \"evidence\": \"Chemogenetic screen, MTF2 vs JARID2 genetic epistasis, genome-wide H3K27me3 ChIP, and palbociclib sensitivity assays\",\n      \"pmids\": [\"39903505\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"How MTF2 selectively targets cyclin D CpG islands not resolved\", \"Direct in vivo relevance to therapy resistance untested\"]\n    },\n    {\n      \"year\": null,\n      \"claim\": \"It remains unresolved how the multilayered transcriptional, epigenetic, and post-transcriptional inputs are integrated to set cyclin D2 dosage in a given cell type, and which CDK partners mediate its proliferative output in non-cancer contexts such as cardiomyocytes.\",\n      \"evidence\": \"\",\n      \"pmids\": [],\n      \"confidence\": \"Low\",\n      \"gaps\": [\"No integrated model of competing regulators\", \"CDK4/6 engagement assumed but not directly demonstrated in most timeline systems\", \"Endogenous GSK-3\\u03b2 phosphorylation kinetics on CCND2 not directly measured\"]\n    }\n  ],\n  \"mechanism_profile\": {\n    \"molecular_activity\": [\n      {\"term_id\": \"GO:0098772\", \"supporting_discovery_ids\": [0, 1, 18]}\n    ],\n    \"localization\": [\n      {\"term_id\": \"GO:0005634\", \"supporting_discovery_ids\": [0, 1]}\n    ],\n    \"pathway\": [\n      {\"term_id\": \"R-HSA-1640170\", \"supporting_discovery_ids\": [0, 1, 2, 11, 18]},\n      {\"term_id\": \"R-HSA-74160\", \"supporting_discovery_ids\": [3, 4, 5, 6, 7, 16]},\n      {\"term_id\": \"R-HSA-8953854\", \"supporting_discovery_ids\": [11, 12, 17]},\n      {\"term_id\": \"R-HSA-1643685\", \"supporting_discovery_ids\": [0, 1, 19]}\n    ],\n    \"complexes\": [],\n    \"partners\": [\"RB1\", \"GSK3B\", \"STAT3\", \"SMAD3\", \"EED\", \"ELAVL1\", \"SRSF1\"],\n    \"other_free_text\": []\n  }\n}","audit_flag":null,"evaluation":{"pairwise":"win","faith_supported":7,"faith_total":7,"faith_pct":100.0}}