{"gene":"CCND1","run_date":"2026-06-09T22:57:17","timeline":{"discoveries":[{"year":1991,"finding":"PRAD1/cyclin D1 protein can be isolated with p13suc1 beads (which bind cdc2 and related kinases), and addition of PRAD1 protein to interphase clam embryo lysates containing inactive p34cdc2 kinase induces phosphorylation of histone H1, a preferred cdc2 substrate, demonstrating that PRAD1 encodes a cyclin capable of forming a complex with and activating p34cdc2 kinase.","method":"p13suc1 bead pulldown from interphase clam embryo lysates; histone H1 kinase assay","journal":"Nature","confidence":"High","confidence_rationale":"Tier 1 / Strong — direct in vitro reconstitution with enzymatic activity readout (histone H1 phosphorylation), foundational study replicated conceptually across many subsequent labs","pmids":["1826542"],"is_preprint":false},{"year":1992,"finding":"PRAD1/cyclin D1 mRNA levels vary dramatically across the cell cycle in HeLa cells, peaking in G1 and declining before S phase, consistent with a role in regulating G1-S phase progression; in normal mammary epithelial cells synchronized by growth factor deprivation, PRAD1 expression peaked in G1.","method":"Northern blot analysis of synchronized HeLa and primary mammary epithelial cells","journal":"The Journal of biological chemistry","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — cell cycle synchronization with Northern blot, single lab, two cell-type systems","pmids":["1383201"],"is_preprint":false},{"year":1993,"finding":"The PRAD1/cyclin D1 gene spans ~15 kb, has 5 exons, and its promoter contains Sp1 binding sites, no TATA box, and an E2F binding motif near the major transcription start site, the latter potentially involved in cell cycle-dependent expression.","method":"Genomic cloning, sequencing, promoter characterization","journal":"Genes, chromosomes & cancer","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — direct genomic cloning and sequencing with identification of regulatory elements; E2F motif is identified but functional validation is inferential","pmids":["7687458"],"is_preprint":false},{"year":1993,"finding":"Sequencing of the overexpressed PRAD1 transcript from a parathyroid adenoma and a centrocytic lymphoma with clonal PRAD1 rearrangements showed coding sequences identical to the normal PRAD1 cDNA, indicating that PRAD1 functions as an oncogene through overexpression of its normal (wild-type) protein, not through coding-sequence mutation.","method":"Direct cDNA sequencing of overexpressed transcripts from primary tumors","journal":"Oncogene","confidence":"High","confidence_rationale":"Tier 1 / Strong — direct sequencing in two independent primary tumor types, supported by subsequent SSCP studies (PMID:7621424) confirming absence of coding mutations","pmids":["8426754","7621424"],"is_preprint":false},{"year":1994,"finding":"The t(11;22)(q13;q11) variant translocation places the Ig lambda light chain gene 3' of the PRAD1 gene, resulting in PRAD1 mRNA overexpression; since only PRAD1 lies between the Ig heavy chain and light chain breakpoints, this identifies PRAD1/cyclin D1 as the BCL-1 oncogene.","method":"Molecular analysis of variant translocation breakpoints by Southern blot and Northern blot","journal":"Blood","confidence":"High","confidence_rationale":"Tier 2 / Strong — reciprocal translocation mapping identifying PRAD1 as BCL-1, replicated across multiple translocation studies (PMIDs: 1394169, 8426477, 8049438)","pmids":["8049438","1394169","8426477"],"is_preprint":false},{"year":1994,"finding":"Rearrangements within the 3' UTR of CCND1 eliminate AU-rich mRNA destabilizing sequences; CCND1 mRNA half-life in t(11;14)-bearing cell lines is >3 hours versus ~0.5 hours in normal tissues, indicating that posttranscriptional stabilization through 3' UTR rearrangement is a mechanism of CCND1 overexpression.","method":"Southern blot mapping of 3' UTR rearrangements; mRNA half-life measurement by Northern blot after actinomycin D treatment","journal":"Blood","confidence":"High","confidence_rationale":"Tier 1 / Moderate — direct mRNA stability measurement combined with mapping of destabilizing sequence deletions, single lab but two orthogonal methods","pmids":["8204893"],"is_preprint":false},{"year":1996,"finding":"Cyclin D1 (CCND1) overexpression in mantle cell lymphoma (MCL) cells promotes cell proliferation by overcoming pRb growth suppression; pRb is expressed and phosphorylated in MCL in proportion to proliferative activity, and cyclin D1 mRNA levels are independent of pRb expression level, consistent with cyclin D1 acting upstream of pRb inactivation.","method":"Immunohistochemistry, Western blot, Northern blot, flow cytometry in MCL patient samples","journal":"The American journal of pathology","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — multiple orthogonal methods (Western, Northern, flow cytometry) in clinical specimens, single lab","pmids":["8623927"],"is_preprint":false},{"year":1996,"finding":"Cyclin D1 (CCND1) collaborates with mutated p53 and activated ras in oncogenic transformation: cyclin D1 alone or with ras or p53-mt was insufficient for focus formation of rat embryonic fibroblasts, but enhanced focus formation and reduced serum dependency when co-transfected with ras and p53-mt transformants, and accelerated in vivo growth in nude mice.","method":"Focus formation assay in rat embryonic fibroblasts; nude mouse xenograft assay","journal":"Japanese journal of cancer research","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — genetic epistasis/collaboration established by co-transfection with functional readouts (focus formation, in vivo growth), single lab","pmids":["8641982"],"is_preprint":false},{"year":1998,"finding":"In breast, sarcoma, and colon cancer cell lines with cyclin D1 overexpression but normal gene copy number, elevated CCND1 mRNA is derived equally from both alleles (by RT-PCR-RFLP at NciI polymorphism), indicating that overexpression results from a trans-acting regulatory influence rather than a clonal cis-acting somatic mutation.","method":"RT-PCR with RFLP (NciI digest) to assess allele-specific mRNA expression in heterozygous tumor cell lines","journal":"Genes, chromosomes & cancer","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — allele-specific expression assay with clear mechanistic inference, single lab, multiple cell lines","pmids":["9591636"],"is_preprint":false},{"year":2005,"finding":"Parafibromin (HRPT2 product) inhibits cell proliferation and blocks cyclin D1 (CCND1) expression; a cancer-associated Leu64Pro missense mutant of parafibromin fails to suppress CCND1 expression or inhibit proliferation, placing parafibromin as a negative regulator of CCND1.","method":"Transient overexpression of wild-type vs. mutant parafibromin in cells; cell proliferation assay; Western blot for CCND1","journal":"Oncogene","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — loss-of-function mutation compared to wild-type with defined phenotypic readouts, single lab","pmids":["15580289"],"is_preprint":false},{"year":2008,"finding":"VRK1 phosphorylates CREB at Ser133 in vitro and facilitates recruitment of phospho-CREB to the CRE element in the CCND1 promoter, thereby activating CCND1 transcription; a kinase-dead VRK1 mutant or VRK1 siRNA knockdown fails to activate CREB and CCND1 expression, and VRK1 mediates Myc-stimulated CCND1 induction.","method":"In vitro kinase assay (VRK1 phosphorylation of CREB); chromatin immunoprecipitation (ChIP); siRNA knockdown; kinase-dead mutant overexpression; luciferase reporter for CRE","journal":"Journal of cell science","confidence":"High","confidence_rationale":"Tier 1 / Moderate — in vitro kinase assay plus ChIP plus mutagenesis (kinase-dead), multiple orthogonal methods in single lab","pmids":["18713830"],"is_preprint":false},{"year":2010,"finding":"The RNA-binding protein La associates with CCND1 mRNA and promotes CCND1 IRES-dependent translation; La depletion reduces CCND1 protein and cell proliferation, which is rescued by re-expression of La but not in CCND1 knockout cells, establishing a functional La→CCND1 translation axis.","method":"siRNA knockdown; in vivo RNP immunoprecipitation (RIP); CCND1 IRES-reporter assay; rescue in CCND1 knockout cells","journal":"Oncogene","confidence":"High","confidence_rationale":"Tier 1 / Moderate — RIP showing direct mRNA association, IRES reporter assay, genetic rescue experiment in KO cells; multiple orthogonal methods, single lab","pmids":["20856207"],"is_preprint":false},{"year":2013,"finding":"Overexpression of Cdk6/Ccnd1 together (but not either alone) in chondrocytes highly phosphorylates pRb, upregulates p107, inhibits chondrocyte maturation, and causes p53-dependent apoptosis; kinase-negative Cdk6/cyclin D1 abolishes all these effects, demonstrating that Cdk6/Ccnd1 kinase activity is required for pRb phosphorylation, E2f target gene dysregulation, and apoptosis in chondrocytes.","method":"Transgenic mouse overexpression (chondrocyte-specific Col2a1-Cdk6 and/or Ccnd1); kinase-dead mutant; BrdU/TUNEL labeling; Western blot for pRb phosphorylation; p53 knockout rescue","journal":"Oncogene","confidence":"High","confidence_rationale":"Tier 1 / Strong — in vivo transgenic models plus kinase-dead mutagenesis plus genetic epistasis (p53 KO rescue), multiple orthogonal methods","pmids":["23624920"],"is_preprint":false},{"year":2016,"finding":"CCND1 mutations E36K, Y44D, and C47S increase CCND1 protein stability by attenuating phosphorylation at Thr286 (required for ubiquitin-proteasome-mediated proteolysis), and the mutant proteins preferentially localize to the nucleus; forced expression of wild-type or mutant CCND1 increases MCL cell resistance to ibrutinib.","method":"Site-directed mutagenesis; Western blot for Thr286 phosphorylation and protein levels; immunofluorescence for subcellular localization; cell viability assay with ibrutinib","journal":"Oncotarget","confidence":"High","confidence_rationale":"Tier 1 / Moderate — mutagenesis combined with phosphorylation analysis, localization assay, and functional drug resistance readout; multiple orthogonal methods in single lab","pmids":["27713153"],"is_preprint":false},{"year":2016,"finding":"MYF5 binds the 3' UTR and coding region of Ccnd1 mRNA (by RIP, biotin-RNA pulldown, UV-crosslinking, gel shift) and promotes CCND1 translation; MYF5 silencing reduces CCND1 protein and myoblast proliferation, which is partially rescued by restoring CCND1 abundance.","method":"RNP immunoprecipitation (RIP), biotin-RNA pulldown, UV-crosslinking, gel shift, siRNA knockdown, polysome/translation assay","journal":"Nucleic acids research","confidence":"High","confidence_rationale":"Tier 1 / Strong — multiple direct RNA-binding assays (RIP, pulldown, UV-crosslinking, gel shift) plus functional rescue, single lab but highly orthogonal","pmids":["26819411"],"is_preprint":false},{"year":2018,"finding":"CCND1 interacts with and sequesters HDAC1 and HDAC2 from the SOX11 locus, leading to increased acetylation of histones H3K9 and H3K14 at SOX11 and upregulation of SOX11 transcription in MCL.","method":"Co-immunoprecipitation; ChIP for H3K9/14Ac at SOX11 locus; siRNA knockdown of HDAC1/2; HDAC inhibitor (vorinostat) treatment; ectopic CCND1 expression","journal":"Blood","confidence":"High","confidence_rationale":"Tier 1 / Moderate — Co-IP showing CCND1-HDAC interaction, ChIP showing histone acetylation changes at SOX11, multiple orthogonal validation methods, single lab","pmids":["30530749"],"is_preprint":false},{"year":2018,"finding":"p27 inhibits the formation of the CDK6/CCND1 complex (demonstrated by co-immunoprecipitation and immunofluorescence), causing G1/S cell cycle arrest and inhibiting proliferation; p27 does not directly alter CDK6 or CCND1 expression levels, and CCND1 does not regulate the cell cycle independently of CDK6.","method":"Co-immunoprecipitation; immunofluorescence; flow cytometry (cell cycle); MTT proliferation assay; Western blot","journal":"Cell cycle","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — Co-IP showing complex inhibition plus cell cycle assay, multiple methods, single lab","pmids":["30317923"],"is_preprint":false},{"year":2018,"finding":"Cell cycle regulation by alternative polyadenylation (APA) of CCND1: CRISPR/Cas9 editing of the weak proximal poly(A) signal to a canonical PAS forces use of the proximal APA site, producing shorter CCND1 3' UTR transcripts that accelerate the cell cycle and promote cell proliferation.","method":"CRISPR/Cas9 PAS editing; cell cycle profiling by flow cytometry; cell proliferation assay","journal":"Scientific reports","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — CRISPR editing with defined phenotypic readouts, single lab","pmids":["29717174"],"is_preprint":false},{"year":2020,"finding":"USP10 deubiquitinase interacts with CCND1 and prevents its K48-linked polyubiquitination, thereby stabilizing CCND1 protein; USP10 knockdown downregulates CCND1 and causes GBM cell cycle arrest at G1 and apoptosis; the natural compound acevaltrate suppresses USP10-mediated CCND1 deubiquitination.","method":"Co-immunoprecipitation; ubiquitination assay (K48 vs K63 linkage); sgRNA-mediated USP10 knockdown; flow cytometry (cell cycle and apoptosis); Western blot","journal":"Acta pharmacologica Sinica","confidence":"High","confidence_rationale":"Tier 1 / Moderate — Co-IP, K48-specific ubiquitination assay, genetic knockdown with phenotypic readout; multiple orthogonal methods, single lab","pmids":["33184448"],"is_preprint":false},{"year":2020,"finding":"AURKB activates CCND1 transcription through phosphorylation of histone H3 at Ser10 (H3S10ph) at the CCND1 promoter; AURKB silencing reduces H3S10ph at the CCND1 promoter and decreases CCND1 expression, arresting cells at G2/M; the AURKB inhibitor AZD1152 also suppresses CCND1 expression.","method":"siRNA knockdown; ChIP for H3S10ph at CCND1 promoter; flow cytometry; Western blot; AZD1152 inhibitor treatment; in vivo xenograft","journal":"Aging","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — ChIP at CCND1 promoter plus functional knockdown/inhibitor studies, single lab, two orthogonal methods","pmids":["31982864"],"is_preprint":false},{"year":2022,"finding":"YTHDF3 m6A reader and METTL3 m6A writer regulate translation of Ccnd1 mRNA through m6A modification on the 5' UTR of Ccnd1; dysfunction of Ythdf3 or Mettl3 causes translational defects in Ccnd1 and impairs HSC reconstitution capacity; enforced Ccnd1 expression fully rescues Ythdf3-/- HSC defects.","method":"Ythdf3 knockout mouse; m6A sequencing/mapping; polysome/translation assay; genetic rescue with enforced Ccnd1 expression; bone marrow reconstitution assay","journal":"Haematologica","confidence":"High","confidence_rationale":"Tier 1 / Strong — genetic KO with complete rescue by Ccnd1 overexpression, m6A mapping at 5' UTR, translation assay; multiple orthogonal methods with compelling epistasis","pmids":["35112553"],"is_preprint":false},{"year":2021,"finding":"FTO m6A demethylase controls CCND1 mRNA stability through YTHDF2-mediated degradation: FTO knockdown increases m6A on CCND1 mRNA, leading to YTHDF2-dependent mRNA degradation, decreased CCND1 expression, G1 phase delay, and impaired myoblast proliferation.","method":"siRNA knockdown of FTO; m6A RNA immunoprecipitation; RNA stability assay; flow cytometry (cell cycle); Western blot for CCND1","journal":"Experimental cell research","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — m6A RIP plus functional knockdown with cell cycle readout, single lab","pmids":["33651996"],"is_preprint":false},{"year":2024,"finding":"G-quadruplexes (G4s) in the CCND1 promoter recruit MAZ transcription factor through its zinc finger 2 domain, facilitating MAZ phase-separated condensate formation (requiring ZF3-5) that compartmentalizes coactivators BRD4, MED1, CDK9, and active RNA Pol II to activate CCND1 transcription; MAZ mutants lacking G4 binding or phase separation cannot form nuclear puncta and fail to promote hepatocellular carcinoma cell proliferation.","method":"G4-specific binding assay; domain mutagenesis; co-localization/co-immunoprecipitation of MAZ condensates with coactivators; xenograft tumor assay; ChIP for active Pol II and histone marks at CCND1 promoter","journal":"Nature communications","confidence":"High","confidence_rationale":"Tier 1 / Moderate — structure-function mutagenesis, co-localization with multiple coactivators, G4 binding assay, functional in vivo xenograft with mutants; multiple orthogonal methods in single lab","pmids":["38316778"],"is_preprint":false},{"year":2015,"finding":"JARID2 negatively regulates CCND1 expression by increasing H3K27 trimethylation at the CCND1 promoter (ChIP assay); JARID2 knockdown promotes leukemia cell G1/S transition and proliferation, while ectopic JARID2 expression inhibits these effects.","method":"ChIP for H3K27me3 at CCND1 promoter; siRNA knockdown and ectopic overexpression; flow cytometry (cell cycle); Western blot","journal":"International journal of hematology","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — ChIP at CCND1 promoter plus loss/gain-of-function with cell cycle readout, single lab","pmids":["25939703"],"is_preprint":false},{"year":2018,"finding":"SETDB1 histone methyltransferase interacts with transcription factor ERG to promote CCND1 transcription by binding to the CCND1 promoter region; SETDB1 overexpression increases CCND1 expression and gastric cancer cell proliferation, while SETDB1 suppression has the opposite effect.","method":"Co-immunoprecipitation (SETDB1-ERG interaction); ChIP at CCND1 promoter; siRNA knockdown and overexpression; cell proliferation and in vivo assays","journal":"The Journal of pathology","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — Co-IP plus ChIP at CCND1 promoter, loss/gain-of-function, single lab","pmids":["33044755"],"is_preprint":false},{"year":2014,"finding":"OCT4 directly binds the octamer motif (ATTTTGCAT) in the CCND1 promoter to activate CCND1 transcription; mutation of the octamer motif abolishes OCT4-induced CCND1 promoter activity, while CCND1 suppression does not affect OCT4 expression, establishing a unidirectional OCT4→CCND1 transcriptional regulatory axis.","method":"Luciferase reporter assay with wild-type and octamer-mutant CCND1 promoters; siRNA knockdown; Western blot; cell cycle analysis; xenograft","journal":"Cancer letters","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — promoter mutagenesis with luciferase reporter plus functional knockdown; single lab, two orthogonal methods","pmids":["25128069"],"is_preprint":false},{"year":2018,"finding":"JAM3 directly associates with LRP5 to activate the PDK1/AKT pathway, resulting in GSK3β downregulation and activation of β-catenin/CCND1 signaling, maintaining leukemia-initiating cell self-renewal; Jam3 deletion abrogates leukemogenesis without affecting normal hematopoietic stem cells.","method":"Co-immunoprecipitation (JAM3-LRP5); JAM3 genetic deletion (MLL-AF9 murine AML model); serial transplantation; pathway inhibitor studies; Western blot","journal":"The Journal of clinical investigation","confidence":"High","confidence_rationale":"Tier 2 / Strong — reciprocal Co-IP for JAM3-LRP5 interaction, genetic KO with serial transplantation (definitive functional test), epistasis through AKT/GSK3β/β-catenin/CCND1 pathway; replicated in human and mouse models","pmids":["29584620"],"is_preprint":false}],"current_model":"CCND1 (cyclin D1/PRAD1) is a G1 cyclin that forms a complex with and activates CDK4/CDK6 (and historically p34cdc2), promoting G1→S phase progression by phosphorylating and inactivating pRb; its expression is regulated at multiple levels including transcription (by OCT4, SETDB1/ERG, AURKB-mediated H3S10ph, MAZ phase-separated condensates at G4 promoter elements, and Wnt/TCF4), mRNA stability (via 3' UTR AU-rich elements regulated by rearrangement or La protein IRES-mediated translation), and m6A-dependent translation (via METTL3/YTHDF3 at the 5' UTR); protein stability is controlled by Thr286 phosphorylation-dependent ubiquitin-proteasome degradation, which is attenuated by cancer-associated point mutations (E36K, Y44D, C47S) or counteracted by USP10 deubiquitinase; overexpression through chromosomal translocation (t(11;14)/BCL-1), gene amplification, or trans-acting mechanisms drives oncogenesis in mantle cell lymphoma, parathyroid adenomas, and numerous other cancers."},"narrative":{"mechanistic_narrative":"CCND1 (cyclin D1/PRAD1) is a G1 cyclin that drives the G1→S phase transition by forming an active kinase complex: it was first shown to associate with and activate cdc2-family kinases, conferring histone H1 kinase activity [PMID:1826542], and its mRNA peaks in G1 and falls before S phase in synchronized cells [PMID:1383201]. In partnership with CDK6, CCND1 phosphorylates and inactivates pRb to de-repress E2F target genes; this activity requires an intact kinase and, in chondrocytes, drives pRb hyperphosphorylation, E2F target dysregulation and p53-dependent apoptosis [PMID:23624920], while CCND1 has no cell-cycle activity independent of CDK6, and p27 arrests cells by blocking CDK6/CCND1 complex assembly [PMID:30317923]. Beyond its canonical kinase role, CCND1 acts in the nucleus to remodel chromatin, sequestering HDAC1/HDAC2 away from the SOX11 locus to increase H3K9/K14 acetylation and SOX11 transcription in mantle cell lymphoma [PMID:30530749]. CCND1 expression is controlled at every level. Transcription is activated through promoter elements bound by OCT4 [PMID:25128069], phospho-CREB downstream of VRK1 [PMID:18713830], a SETDB1–ERG complex [PMID:33044755], AURKB-deposited H3S10ph marks [PMID:31982864], MAZ phase-separated condensates nucleated on promoter G-quadruplexes that compartmentalize BRD4/MED1/CDK9/Pol II [PMID:38316778], and β-catenin signaling driven by JAM3–LRP5→AKT→GSK3β [PMID:29584620], and is repressed by parafibromin [PMID:15580289] and by JARID2-mediated H3K27me3 [PMID:25939703]. mRNA fate is set by 3' UTR AU-rich elements and alternative polyadenylation [PMID:8204893, PMID:29717174], by m6A marks read by YTHDF3/written by METTL3 in the 5' UTR to promote translation [PMID:35112553] and erased by FTO to prevent YTHDF2-dependent decay [PMID:33651996], and by RNA-binding translational activators La [PMID:20856207] and MYF5 [PMID:26819411]. Protein abundance is governed by Thr286 phosphorylation-dependent ubiquitin–proteasome degradation, which is opposed by the USP10 deubiquitinase that removes K48-linked chains [PMID:33184448]. CCND1 is the BCL-1 oncogene, identified through the t(11;14)/variant Ig translocations, and functions as an oncogene by overexpression of the wild-type protein rather than coding mutation [PMID:8426754, PMID:7621424, PMID:8049438, PMID:1394169, PMID:8426477]; overexpression arises from translocation, 3' UTR stabilization, or trans-acting regulation [PMID:8204893, PMID:9591636], and cancer-associated point mutations (E36K, Y44D, C47S) that block Thr286 phosphorylation further stabilize nuclear CCND1 and confer ibrutinib resistance [PMID:27713153].","teleology":[{"year":1991,"claim":"Established that the PRAD1 gene product is a functional cyclin, answering whether this oncogene candidate had cyclin-kinase activity.","evidence":"p13suc1 bead pulldown and histone H1 kinase reconstitution in clam embryo lysates","pmids":["1826542"],"confidence":"High","gaps":["Used cdc2 rather than the physiological CDK4/6 partner","Did not establish the cell-cycle phase of action in mammalian cells"]},{"year":1992,"claim":"Linked CCND1 to G1 control by showing its expression is cell-cycle regulated, establishing when in the cycle it acts.","evidence":"Northern blot of synchronized HeLa and mammary epithelial cells","pmids":["1383201"],"confidence":"Medium","gaps":["Correlative expression timing, not a functional perturbation","Did not identify the downstream substrate"]},{"year":1993,"claim":"Defined the promoter architecture and showed CCND1 is oncogenic through wild-type overexpression, not coding mutation, settling the mechanism of its oncogene activity.","evidence":"Genomic cloning/promoter characterization and direct cDNA sequencing of overexpressed tumor transcripts","pmids":["7687458","8426754","7621424"],"confidence":"High","gaps":["Did not identify the trans-acting factors driving overexpression","E2F motif function inferential at this stage"]},{"year":1994,"claim":"Identified CCND1 as the BCL-1 oncogene and revealed 3' UTR rearrangement as a posttranscriptional overexpression mechanism, explaining how translocation deregulates the gene.","evidence":"Variant Ig translocation breakpoint mapping and actinomycin D mRNA half-life measurements in t(11;14) cell lines","pmids":["8049438","1394169","8426477","8204893"],"confidence":"High","gaps":["Did not identify the trans-factors binding the AU-rich elements","Half-life measured in cell lines, not primary tumors"]},{"year":1996,"claim":"Placed CCND1 functionally upstream of pRb and demonstrated oncogenic collaboration, situating it within the cell-cycle and transformation network.","evidence":"MCL clinical specimen analysis (IHC/Western/Northern/flow) and rat fibroblast focus formation with ras and mutant p53","pmids":["8623927","8641982"],"confidence":"Medium","gaps":["pRb relationship inferred from correlation in patient samples","Focus formation does not define the molecular mechanism of collaboration"]},{"year":1998,"claim":"Showed that overexpression in copy-number-normal tumors is biallelic, establishing trans-acting regulation as a mechanism distinct from cis mutation.","evidence":"Allele-specific RT-PCR-RFLP at the NciI polymorphism in heterozygous tumor lines","pmids":["9591636"],"confidence":"Medium","gaps":["Did not identify the responsible trans-acting regulator"]},{"year":2010,"claim":"Identified translational control of CCND1, showing RNA-binding proteins drive its synthesis beyond transcription.","evidence":"RIP, IRES-reporter assay, and rescue in CCND1-null cells for La","pmids":["20856207"],"confidence":"High","gaps":["IRES mechanism vs cap-dependent contribution not quantified","Tissue contexts of La-dependent control undefined"]},{"year":2013,"claim":"Demonstrated that CCND1/CDK6 kinase activity is mechanistically required for pRb phosphorylation and downstream consequences in vivo.","evidence":"Chondrocyte-specific transgenic overexpression with kinase-dead mutants and p53-KO rescue","pmids":["23624920"],"confidence":"High","gaps":["Chondrocyte-specific; generalization to other lineages assumed","Did not address CDK4 partnership"]},{"year":2016,"claim":"Defined how cancer-associated point mutations stabilize CCND1 and confer drug resistance, linking Thr286-dependent degradation to therapy response.","evidence":"Site-directed mutagenesis with Thr286 phospho-Western, immunofluorescence, and ibrutinib viability assay; MYF5 RNA-binding/translation assays","pmids":["27713153","26819411"],"confidence":"High","gaps":["Did not identify the relevant E3 ligase","Ibrutinib resistance mechanism downstream of CCND1 not detailed"]},{"year":2018,"claim":"Revealed non-canonical and multilayered control: CCND1 sequesters HDACs to remodel chromatin, requires CDK6 for cell-cycle function, and is regulated by APA, SETDB1-ERG, OCT4, and JAM3-driven β-catenin signaling.","evidence":"Co-IP, ChIP for histone marks, CRISPR PAS editing, luciferase promoter mutagenesis, and genetic KO with serial transplantation across multiple systems","pmids":["30530749","30317923","29717174","33044755","25128069","29584620","25939703"],"confidence":"High","gaps":["HDAC sequestration generality across loci unknown","Many transcriptional inputs validated in single cancer contexts"]},{"year":2020,"claim":"Established deubiquitination and chromatin/epigenetic transcriptional inputs as additional control points stabilizing CCND1 protein and activating its transcription.","evidence":"USP10 K48-ubiquitination and Co-IP assays; AURKB H3S10ph ChIP at CCND1 promoter with inhibitor and xenograft","pmids":["33184448","31982864"],"confidence":"High","gaps":["USP10 regulation upstream undefined","AURKB study at Medium confidence with limited orthogonal validation"]},{"year":2022,"claim":"Detailed m6A-dependent translational and stability control and G-quadruplex/condensate-driven transcription, defining the most recent layers of CCND1 regulation.","evidence":"Ythdf3-KO mouse with Ccnd1-rescue and m6A mapping; FTO m6A-RIP/stability assays; MAZ G4-binding and phase-separation mutagenesis with xenograft","pmids":["35112553","33651996","38316778"],"confidence":"High","gaps":["Interplay between m6A writers/erasers/readers at CCND1 not integrated","Condensate mechanism studied in HCC only"]},{"year":null,"claim":"How the many transcriptional, RNA-stability, translational, and protein-stability inputs are integrated to set CCND1 levels in a given cell type, and which are tractable therapeutic nodes, remains unresolved.","evidence":"","pmids":[],"confidence":"Medium","gaps":["No unified quantitative model of competing regulatory inputs","Physiological E3 ligase for Thr286-dependent degradation not identified in this corpus","Endogenous CDK4 partnership not addressed in the timeline"]}],"mechanism_profile":{"molecular_activity":[{"term_id":"GO:0098772","term_label":"molecular function regulator activity","supporting_discovery_ids":[0,12,16]},{"term_id":"GO:0140110","term_label":"transcription regulator activity","supporting_discovery_ids":[15]}],"localization":[{"term_id":"GO:0005634","term_label":"nucleus","supporting_discovery_ids":[13,15]}],"pathway":[{"term_id":"R-HSA-1640170","term_label":"Cell Cycle","supporting_discovery_ids":[1,12,16]},{"term_id":"R-HSA-1643685","term_label":"Disease","supporting_discovery_ids":[3,4,13]}],"complexes":["CDK6/cyclin D1"],"partners":["CDK6","HDAC1","HDAC2","USP10","CDKN1B"],"other_free_text":[]}},"prefetch_data":{"uniprot":{"accession":"P24385","full_name":"G1/S-specific cyclin-D1","aliases":["B-cell lymphoma 1 protein","BCL-1","BCL-1 oncogene","PRAD1 oncogene"],"length_aa":295,"mass_kda":33.7,"function":"Regulatory component of the cyclin D1-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:1827756, PubMed:1833066, PubMed:19412162, PubMed:33854235, PubMed:8114739, PubMed:8302605). 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:1827756, PubMed:1833066, PubMed:19412162, PubMed:8114739, PubMed:8302605). Hypophosphorylates RB1 in early G(1) phase (PubMed:1827756, PubMed:1833066, PubMed:19412162, PubMed:8114739, PubMed:8302605). Cyclin D-CDK4 complexes are major integrators of various mitogenenic and antimitogenic signals (PubMed:1827756, PubMed:1833066, PubMed:19412162, PubMed:8302605). Also a substrate for SMAD3, phosphorylating SMAD3 in a cell-cycle-dependent manner and repressing its transcriptional activity (PubMed:15241418). Component of the ternary complex, cyclin D1/CDK4/CDKN1B, required for nuclear translocation and activity of the cyclin D-CDK4 complex (PubMed:9106657). Exhibits transcriptional corepressor activity with INSM1 on the NEUROD1 and INS promoters in a cell cycle-independent manner (PubMed:16569215, PubMed:18417529)","subcellular_location":"Nucleus; Cytoplasm; Nucleus membrane","url":"https://www.uniprot.org/uniprotkb/P24385/entry"},"depmap":{"release":"DepMap","has_data":true,"is_common_essential":true,"resolved_as":"","url":"https://depmap.org/portal/gene/CCND1","classification":"Common Essential","n_dependent_lines":900,"n_total_lines":1208,"dependency_fraction":0.7450331125827815},"opencell":{"profiled":false,"resolved_as":"","ensg_id":"","cell_line_id":"","localizations":[],"interactors":[],"url":"https://opencell.sf.czbiohub.org/search/CCND1","total_profiled":1310},"omim":[{"mim_id":"621377","title":"HAREL-TORA NEURODEVELOPMENTAL SYNDROME; HATONS","url":"https://www.omim.org/entry/621377"},{"mim_id":"620491","title":"MATURIN, NEURAL PROGENITOR DIFFERENTIATION REGULATOR HOMOLOG; 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research : Gann","url":"https://pubmed.ncbi.nlm.nih.gov/8641982","citation_count":15,"is_preprint":false},{"pmid":"33480984","id":"PMC_33480984","title":"MicroRNA-374b inhibits breast cancer progression through regulating CCND1 and TGFA genes.","date":"2021","source":"Carcinogenesis","url":"https://pubmed.ncbi.nlm.nih.gov/33480984","citation_count":15,"is_preprint":false},{"pmid":"31321645","id":"PMC_31321645","title":"Downregulation of TCEAL7 expression induces CCND1 expression in non-small cell lung cancer.","date":"2019","source":"Molecular biology reports","url":"https://pubmed.ncbi.nlm.nih.gov/31321645","citation_count":14,"is_preprint":false},{"pmid":"35814257","id":"PMC_35814257","title":"LY2874455 and Abemaciclib Reverse FGF3/4/19/CCND1 Amplification Mediated Gefitinib Resistance in NSCLC.","date":"2022","source":"Frontiers in pharmacology","url":"https://pubmed.ncbi.nlm.nih.gov/35814257","citation_count":14,"is_preprint":false},{"pmid":"36658474","id":"PMC_36658474","title":"Protective role of circRNA CCND1 in ulcerative colitis via miR-142-5p/NCOA3 axis.","date":"2023","source":"BMC gastroenterology","url":"https://pubmed.ncbi.nlm.nih.gov/36658474","citation_count":14,"is_preprint":false},{"pmid":"8133028","id":"PMC_8133028","title":"Fc gamma RII cross-linking inhibits anti-Ig-induced erg-1 and erg-2 expression in BCL1.","date":"1994","source":"Journal of immunology (Baltimore, Md. : 1950)","url":"https://pubmed.ncbi.nlm.nih.gov/8133028","citation_count":14,"is_preprint":false},{"pmid":"19084934","id":"PMC_19084934","title":"Tissue array for Tp53, C-myc, CCND1 gene over-expression in different tumors.","date":"2008","source":"World journal of gastroenterology","url":"https://pubmed.ncbi.nlm.nih.gov/19084934","citation_count":14,"is_preprint":false},{"pmid":"8086622","id":"PMC_8086622","title":"Clinical aspects of B-cell malignancy involving the BCL1/PRAD1 locus.","date":"1994","source":"International journal of hematology","url":"https://pubmed.ncbi.nlm.nih.gov/8086622","citation_count":13,"is_preprint":false},{"pmid":"1483873","id":"PMC_1483873","title":"PRAD1 (cyclin D1): a parathyroid neoplasia gene on 11q13.","date":"1992","source":"Henry Ford Hospital medical journal","url":"https://pubmed.ncbi.nlm.nih.gov/1483873","citation_count":13,"is_preprint":false},{"pmid":"28824300","id":"PMC_28824300","title":"The EMSY Gene Collaborates with CCND1 in Non-Small Cell Lung Carcinogenesis.","date":"2017","source":"International journal of medical sciences","url":"https://pubmed.ncbi.nlm.nih.gov/28824300","citation_count":13,"is_preprint":false},{"pmid":"19047168","id":"PMC_19047168","title":"Overcoming immunoescape mechanisms of BCL1 leukemia and induction of CD8+ T-cell-mediated BCL1-specific resistance in mice cured by targeted polymer-bound doxorubicin.","date":"2008","source":"Cancer research","url":"https://pubmed.ncbi.nlm.nih.gov/19047168","citation_count":13,"is_preprint":false},{"pmid":"34564768","id":"PMC_34564768","title":"CircRNA Circ-CCND1 Aggravates Hepatocellular Carcinoma Tumorigenesis by Regulating the miR-497-5p/HMGA2 Axis.","date":"2021","source":"Molecular biotechnology","url":"https://pubmed.ncbi.nlm.nih.gov/34564768","citation_count":13,"is_preprint":false}],"cost":{"stage1":{"model":"claude-sonnet-4-6","input_tokens":53380,"output_tokens":6999,"usd":0.132562,"stage1_stop_reason":"end_turn"},"stage2":{"model":"claude-opus-4-8","input_tokens":15985,"output_tokens":4119,"usd":0.09145,"stage2_stop_reason":"end_turn"},"total_usd":0.224012,"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\": 1991,\n      \"finding\": \"PRAD1/cyclin D1 protein can be isolated with p13suc1 beads (which bind cdc2 and related kinases), and addition of PRAD1 protein to interphase clam embryo lysates containing inactive p34cdc2 kinase induces phosphorylation of histone H1, a preferred cdc2 substrate, demonstrating that PRAD1 encodes a cyclin capable of forming a complex with and activating p34cdc2 kinase.\",\n      \"method\": \"p13suc1 bead pulldown from interphase clam embryo lysates; histone H1 kinase assay\",\n      \"journal\": \"Nature\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 / Strong — direct in vitro reconstitution with enzymatic activity readout (histone H1 phosphorylation), foundational study replicated conceptually across many subsequent labs\",\n      \"pmids\": [\"1826542\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 1992,\n      \"finding\": \"PRAD1/cyclin D1 mRNA levels vary dramatically across the cell cycle in HeLa cells, peaking in G1 and declining before S phase, consistent with a role in regulating G1-S phase progression; in normal mammary epithelial cells synchronized by growth factor deprivation, PRAD1 expression peaked in G1.\",\n      \"method\": \"Northern blot analysis of synchronized HeLa and primary mammary epithelial cells\",\n      \"journal\": \"The Journal of biological chemistry\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — cell cycle synchronization with Northern blot, single lab, two cell-type systems\",\n      \"pmids\": [\"1383201\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 1993,\n      \"finding\": \"The PRAD1/cyclin D1 gene spans ~15 kb, has 5 exons, and its promoter contains Sp1 binding sites, no TATA box, and an E2F binding motif near the major transcription start site, the latter potentially involved in cell cycle-dependent expression.\",\n      \"method\": \"Genomic cloning, sequencing, promoter characterization\",\n      \"journal\": \"Genes, chromosomes & cancer\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — direct genomic cloning and sequencing with identification of regulatory elements; E2F motif is identified but functional validation is inferential\",\n      \"pmids\": [\"7687458\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 1993,\n      \"finding\": \"Sequencing of the overexpressed PRAD1 transcript from a parathyroid adenoma and a centrocytic lymphoma with clonal PRAD1 rearrangements showed coding sequences identical to the normal PRAD1 cDNA, indicating that PRAD1 functions as an oncogene through overexpression of its normal (wild-type) protein, not through coding-sequence mutation.\",\n      \"method\": \"Direct cDNA sequencing of overexpressed transcripts from primary tumors\",\n      \"journal\": \"Oncogene\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 / Strong — direct sequencing in two independent primary tumor types, supported by subsequent SSCP studies (PMID:7621424) confirming absence of coding mutations\",\n      \"pmids\": [\"8426754\", \"7621424\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 1994,\n      \"finding\": \"The t(11;22)(q13;q11) variant translocation places the Ig lambda light chain gene 3' of the PRAD1 gene, resulting in PRAD1 mRNA overexpression; since only PRAD1 lies between the Ig heavy chain and light chain breakpoints, this identifies PRAD1/cyclin D1 as the BCL-1 oncogene.\",\n      \"method\": \"Molecular analysis of variant translocation breakpoints by Southern blot and Northern blot\",\n      \"journal\": \"Blood\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — reciprocal translocation mapping identifying PRAD1 as BCL-1, replicated across multiple translocation studies (PMIDs: 1394169, 8426477, 8049438)\",\n      \"pmids\": [\"8049438\", \"1394169\", \"8426477\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 1994,\n      \"finding\": \"Rearrangements within the 3' UTR of CCND1 eliminate AU-rich mRNA destabilizing sequences; CCND1 mRNA half-life in t(11;14)-bearing cell lines is >3 hours versus ~0.5 hours in normal tissues, indicating that posttranscriptional stabilization through 3' UTR rearrangement is a mechanism of CCND1 overexpression.\",\n      \"method\": \"Southern blot mapping of 3' UTR rearrangements; mRNA half-life measurement by Northern blot after actinomycin D treatment\",\n      \"journal\": \"Blood\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 / Moderate — direct mRNA stability measurement combined with mapping of destabilizing sequence deletions, single lab but two orthogonal methods\",\n      \"pmids\": [\"8204893\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 1996,\n      \"finding\": \"Cyclin D1 (CCND1) overexpression in mantle cell lymphoma (MCL) cells promotes cell proliferation by overcoming pRb growth suppression; pRb is expressed and phosphorylated in MCL in proportion to proliferative activity, and cyclin D1 mRNA levels are independent of pRb expression level, consistent with cyclin D1 acting upstream of pRb inactivation.\",\n      \"method\": \"Immunohistochemistry, Western blot, Northern blot, flow cytometry in MCL patient samples\",\n      \"journal\": \"The American journal of pathology\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — multiple orthogonal methods (Western, Northern, flow cytometry) in clinical specimens, single lab\",\n      \"pmids\": [\"8623927\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 1996,\n      \"finding\": \"Cyclin D1 (CCND1) collaborates with mutated p53 and activated ras in oncogenic transformation: cyclin D1 alone or with ras or p53-mt was insufficient for focus formation of rat embryonic fibroblasts, but enhanced focus formation and reduced serum dependency when co-transfected with ras and p53-mt transformants, and accelerated in vivo growth in nude mice.\",\n      \"method\": \"Focus formation assay in rat embryonic fibroblasts; nude mouse xenograft assay\",\n      \"journal\": \"Japanese journal of cancer research\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — genetic epistasis/collaboration established by co-transfection with functional readouts (focus formation, in vivo growth), single lab\",\n      \"pmids\": [\"8641982\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 1998,\n      \"finding\": \"In breast, sarcoma, and colon cancer cell lines with cyclin D1 overexpression but normal gene copy number, elevated CCND1 mRNA is derived equally from both alleles (by RT-PCR-RFLP at NciI polymorphism), indicating that overexpression results from a trans-acting regulatory influence rather than a clonal cis-acting somatic mutation.\",\n      \"method\": \"RT-PCR with RFLP (NciI digest) to assess allele-specific mRNA expression in heterozygous tumor cell lines\",\n      \"journal\": \"Genes, chromosomes & cancer\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — allele-specific expression assay with clear mechanistic inference, single lab, multiple cell lines\",\n      \"pmids\": [\"9591636\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2005,\n      \"finding\": \"Parafibromin (HRPT2 product) inhibits cell proliferation and blocks cyclin D1 (CCND1) expression; a cancer-associated Leu64Pro missense mutant of parafibromin fails to suppress CCND1 expression or inhibit proliferation, placing parafibromin as a negative regulator of CCND1.\",\n      \"method\": \"Transient overexpression of wild-type vs. mutant parafibromin in cells; cell proliferation assay; Western blot for CCND1\",\n      \"journal\": \"Oncogene\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — loss-of-function mutation compared to wild-type with defined phenotypic readouts, single lab\",\n      \"pmids\": [\"15580289\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2008,\n      \"finding\": \"VRK1 phosphorylates CREB at Ser133 in vitro and facilitates recruitment of phospho-CREB to the CRE element in the CCND1 promoter, thereby activating CCND1 transcription; a kinase-dead VRK1 mutant or VRK1 siRNA knockdown fails to activate CREB and CCND1 expression, and VRK1 mediates Myc-stimulated CCND1 induction.\",\n      \"method\": \"In vitro kinase assay (VRK1 phosphorylation of CREB); chromatin immunoprecipitation (ChIP); siRNA knockdown; kinase-dead mutant overexpression; luciferase reporter for CRE\",\n      \"journal\": \"Journal of cell science\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 / Moderate — in vitro kinase assay plus ChIP plus mutagenesis (kinase-dead), multiple orthogonal methods in single lab\",\n      \"pmids\": [\"18713830\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2010,\n      \"finding\": \"The RNA-binding protein La associates with CCND1 mRNA and promotes CCND1 IRES-dependent translation; La depletion reduces CCND1 protein and cell proliferation, which is rescued by re-expression of La but not in CCND1 knockout cells, establishing a functional La→CCND1 translation axis.\",\n      \"method\": \"siRNA knockdown; in vivo RNP immunoprecipitation (RIP); CCND1 IRES-reporter assay; rescue in CCND1 knockout cells\",\n      \"journal\": \"Oncogene\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 / Moderate — RIP showing direct mRNA association, IRES reporter assay, genetic rescue experiment in KO cells; multiple orthogonal methods, single lab\",\n      \"pmids\": [\"20856207\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2013,\n      \"finding\": \"Overexpression of Cdk6/Ccnd1 together (but not either alone) in chondrocytes highly phosphorylates pRb, upregulates p107, inhibits chondrocyte maturation, and causes p53-dependent apoptosis; kinase-negative Cdk6/cyclin D1 abolishes all these effects, demonstrating that Cdk6/Ccnd1 kinase activity is required for pRb phosphorylation, E2f target gene dysregulation, and apoptosis in chondrocytes.\",\n      \"method\": \"Transgenic mouse overexpression (chondrocyte-specific Col2a1-Cdk6 and/or Ccnd1); kinase-dead mutant; BrdU/TUNEL labeling; Western blot for pRb phosphorylation; p53 knockout rescue\",\n      \"journal\": \"Oncogene\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 / Strong — in vivo transgenic models plus kinase-dead mutagenesis plus genetic epistasis (p53 KO rescue), multiple orthogonal methods\",\n      \"pmids\": [\"23624920\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2016,\n      \"finding\": \"CCND1 mutations E36K, Y44D, and C47S increase CCND1 protein stability by attenuating phosphorylation at Thr286 (required for ubiquitin-proteasome-mediated proteolysis), and the mutant proteins preferentially localize to the nucleus; forced expression of wild-type or mutant CCND1 increases MCL cell resistance to ibrutinib.\",\n      \"method\": \"Site-directed mutagenesis; Western blot for Thr286 phosphorylation and protein levels; immunofluorescence for subcellular localization; cell viability assay with ibrutinib\",\n      \"journal\": \"Oncotarget\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 / Moderate — mutagenesis combined with phosphorylation analysis, localization assay, and functional drug resistance readout; multiple orthogonal methods in single lab\",\n      \"pmids\": [\"27713153\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2016,\n      \"finding\": \"MYF5 binds the 3' UTR and coding region of Ccnd1 mRNA (by RIP, biotin-RNA pulldown, UV-crosslinking, gel shift) and promotes CCND1 translation; MYF5 silencing reduces CCND1 protein and myoblast proliferation, which is partially rescued by restoring CCND1 abundance.\",\n      \"method\": \"RNP immunoprecipitation (RIP), biotin-RNA pulldown, UV-crosslinking, gel shift, siRNA knockdown, polysome/translation assay\",\n      \"journal\": \"Nucleic acids research\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 / Strong — multiple direct RNA-binding assays (RIP, pulldown, UV-crosslinking, gel shift) plus functional rescue, single lab but highly orthogonal\",\n      \"pmids\": [\"26819411\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2018,\n      \"finding\": \"CCND1 interacts with and sequesters HDAC1 and HDAC2 from the SOX11 locus, leading to increased acetylation of histones H3K9 and H3K14 at SOX11 and upregulation of SOX11 transcription in MCL.\",\n      \"method\": \"Co-immunoprecipitation; ChIP for H3K9/14Ac at SOX11 locus; siRNA knockdown of HDAC1/2; HDAC inhibitor (vorinostat) treatment; ectopic CCND1 expression\",\n      \"journal\": \"Blood\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 / Moderate — Co-IP showing CCND1-HDAC interaction, ChIP showing histone acetylation changes at SOX11, multiple orthogonal validation methods, single lab\",\n      \"pmids\": [\"30530749\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2018,\n      \"finding\": \"p27 inhibits the formation of the CDK6/CCND1 complex (demonstrated by co-immunoprecipitation and immunofluorescence), causing G1/S cell cycle arrest and inhibiting proliferation; p27 does not directly alter CDK6 or CCND1 expression levels, and CCND1 does not regulate the cell cycle independently of CDK6.\",\n      \"method\": \"Co-immunoprecipitation; immunofluorescence; flow cytometry (cell cycle); MTT proliferation assay; Western blot\",\n      \"journal\": \"Cell cycle\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — Co-IP showing complex inhibition plus cell cycle assay, multiple methods, single lab\",\n      \"pmids\": [\"30317923\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2018,\n      \"finding\": \"Cell cycle regulation by alternative polyadenylation (APA) of CCND1: CRISPR/Cas9 editing of the weak proximal poly(A) signal to a canonical PAS forces use of the proximal APA site, producing shorter CCND1 3' UTR transcripts that accelerate the cell cycle and promote cell proliferation.\",\n      \"method\": \"CRISPR/Cas9 PAS editing; cell cycle profiling by flow cytometry; cell proliferation assay\",\n      \"journal\": \"Scientific reports\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — CRISPR editing with defined phenotypic readouts, single lab\",\n      \"pmids\": [\"29717174\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2020,\n      \"finding\": \"USP10 deubiquitinase interacts with CCND1 and prevents its K48-linked polyubiquitination, thereby stabilizing CCND1 protein; USP10 knockdown downregulates CCND1 and causes GBM cell cycle arrest at G1 and apoptosis; the natural compound acevaltrate suppresses USP10-mediated CCND1 deubiquitination.\",\n      \"method\": \"Co-immunoprecipitation; ubiquitination assay (K48 vs K63 linkage); sgRNA-mediated USP10 knockdown; flow cytometry (cell cycle and apoptosis); Western blot\",\n      \"journal\": \"Acta pharmacologica Sinica\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 / Moderate — Co-IP, K48-specific ubiquitination assay, genetic knockdown with phenotypic readout; multiple orthogonal methods, single lab\",\n      \"pmids\": [\"33184448\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2020,\n      \"finding\": \"AURKB activates CCND1 transcription through phosphorylation of histone H3 at Ser10 (H3S10ph) at the CCND1 promoter; AURKB silencing reduces H3S10ph at the CCND1 promoter and decreases CCND1 expression, arresting cells at G2/M; the AURKB inhibitor AZD1152 also suppresses CCND1 expression.\",\n      \"method\": \"siRNA knockdown; ChIP for H3S10ph at CCND1 promoter; flow cytometry; Western blot; AZD1152 inhibitor treatment; in vivo xenograft\",\n      \"journal\": \"Aging\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — ChIP at CCND1 promoter plus functional knockdown/inhibitor studies, single lab, two orthogonal methods\",\n      \"pmids\": [\"31982864\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2022,\n      \"finding\": \"YTHDF3 m6A reader and METTL3 m6A writer regulate translation of Ccnd1 mRNA through m6A modification on the 5' UTR of Ccnd1; dysfunction of Ythdf3 or Mettl3 causes translational defects in Ccnd1 and impairs HSC reconstitution capacity; enforced Ccnd1 expression fully rescues Ythdf3-/- HSC defects.\",\n      \"method\": \"Ythdf3 knockout mouse; m6A sequencing/mapping; polysome/translation assay; genetic rescue with enforced Ccnd1 expression; bone marrow reconstitution assay\",\n      \"journal\": \"Haematologica\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 / Strong — genetic KO with complete rescue by Ccnd1 overexpression, m6A mapping at 5' UTR, translation assay; multiple orthogonal methods with compelling epistasis\",\n      \"pmids\": [\"35112553\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2021,\n      \"finding\": \"FTO m6A demethylase controls CCND1 mRNA stability through YTHDF2-mediated degradation: FTO knockdown increases m6A on CCND1 mRNA, leading to YTHDF2-dependent mRNA degradation, decreased CCND1 expression, G1 phase delay, and impaired myoblast proliferation.\",\n      \"method\": \"siRNA knockdown of FTO; m6A RNA immunoprecipitation; RNA stability assay; flow cytometry (cell cycle); Western blot for CCND1\",\n      \"journal\": \"Experimental cell research\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — m6A RIP plus functional knockdown with cell cycle readout, single lab\",\n      \"pmids\": [\"33651996\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2024,\n      \"finding\": \"G-quadruplexes (G4s) in the CCND1 promoter recruit MAZ transcription factor through its zinc finger 2 domain, facilitating MAZ phase-separated condensate formation (requiring ZF3-5) that compartmentalizes coactivators BRD4, MED1, CDK9, and active RNA Pol II to activate CCND1 transcription; MAZ mutants lacking G4 binding or phase separation cannot form nuclear puncta and fail to promote hepatocellular carcinoma cell proliferation.\",\n      \"method\": \"G4-specific binding assay; domain mutagenesis; co-localization/co-immunoprecipitation of MAZ condensates with coactivators; xenograft tumor assay; ChIP for active Pol II and histone marks at CCND1 promoter\",\n      \"journal\": \"Nature communications\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 / Moderate — structure-function mutagenesis, co-localization with multiple coactivators, G4 binding assay, functional in vivo xenograft with mutants; multiple orthogonal methods in single lab\",\n      \"pmids\": [\"38316778\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2015,\n      \"finding\": \"JARID2 negatively regulates CCND1 expression by increasing H3K27 trimethylation at the CCND1 promoter (ChIP assay); JARID2 knockdown promotes leukemia cell G1/S transition and proliferation, while ectopic JARID2 expression inhibits these effects.\",\n      \"method\": \"ChIP for H3K27me3 at CCND1 promoter; siRNA knockdown and ectopic overexpression; flow cytometry (cell cycle); Western blot\",\n      \"journal\": \"International journal of hematology\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — ChIP at CCND1 promoter plus loss/gain-of-function with cell cycle readout, single lab\",\n      \"pmids\": [\"25939703\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2018,\n      \"finding\": \"SETDB1 histone methyltransferase interacts with transcription factor ERG to promote CCND1 transcription by binding to the CCND1 promoter region; SETDB1 overexpression increases CCND1 expression and gastric cancer cell proliferation, while SETDB1 suppression has the opposite effect.\",\n      \"method\": \"Co-immunoprecipitation (SETDB1-ERG interaction); ChIP at CCND1 promoter; siRNA knockdown and overexpression; cell proliferation and in vivo assays\",\n      \"journal\": \"The Journal of pathology\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — Co-IP plus ChIP at CCND1 promoter, loss/gain-of-function, single lab\",\n      \"pmids\": [\"33044755\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2014,\n      \"finding\": \"OCT4 directly binds the octamer motif (ATTTTGCAT) in the CCND1 promoter to activate CCND1 transcription; mutation of the octamer motif abolishes OCT4-induced CCND1 promoter activity, while CCND1 suppression does not affect OCT4 expression, establishing a unidirectional OCT4→CCND1 transcriptional regulatory axis.\",\n      \"method\": \"Luciferase reporter assay with wild-type and octamer-mutant CCND1 promoters; siRNA knockdown; Western blot; cell cycle analysis; xenograft\",\n      \"journal\": \"Cancer letters\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — promoter mutagenesis with luciferase reporter plus functional knockdown; single lab, two orthogonal methods\",\n      \"pmids\": [\"25128069\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2018,\n      \"finding\": \"JAM3 directly associates with LRP5 to activate the PDK1/AKT pathway, resulting in GSK3β downregulation and activation of β-catenin/CCND1 signaling, maintaining leukemia-initiating cell self-renewal; Jam3 deletion abrogates leukemogenesis without affecting normal hematopoietic stem cells.\",\n      \"method\": \"Co-immunoprecipitation (JAM3-LRP5); JAM3 genetic deletion (MLL-AF9 murine AML model); serial transplantation; pathway inhibitor studies; Western blot\",\n      \"journal\": \"The Journal of clinical investigation\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — reciprocal Co-IP for JAM3-LRP5 interaction, genetic KO with serial transplantation (definitive functional test), epistasis through AKT/GSK3β/β-catenin/CCND1 pathway; replicated in human and mouse models\",\n      \"pmids\": [\"29584620\"],\n      \"is_preprint\": false\n    }\n  ],\n  \"current_model\": \"CCND1 (cyclin D1/PRAD1) is a G1 cyclin that forms a complex with and activates CDK4/CDK6 (and historically p34cdc2), promoting G1→S phase progression by phosphorylating and inactivating pRb; its expression is regulated at multiple levels including transcription (by OCT4, SETDB1/ERG, AURKB-mediated H3S10ph, MAZ phase-separated condensates at G4 promoter elements, and Wnt/TCF4), mRNA stability (via 3' UTR AU-rich elements regulated by rearrangement or La protein IRES-mediated translation), and m6A-dependent translation (via METTL3/YTHDF3 at the 5' UTR); protein stability is controlled by Thr286 phosphorylation-dependent ubiquitin-proteasome degradation, which is attenuated by cancer-associated point mutations (E36K, Y44D, C47S) or counteracted by USP10 deubiquitinase; overexpression through chromosomal translocation (t(11;14)/BCL-1), gene amplification, or trans-acting mechanisms drives oncogenesis in mantle cell lymphoma, parathyroid adenomas, and numerous other cancers.\"\n}\n```","stage2_raw":"{\n  \"mechanistic_narrative\": \"CCND1 (cyclin D1/PRAD1) is a G1 cyclin that drives the G1\\u2192S phase transition by forming an active kinase complex: it was first shown to associate with and activate cdc2-family kinases, conferring histone H1 kinase activity [#0], and its mRNA peaks in G1 and falls before S phase in synchronized cells [#1]. In partnership with CDK6, CCND1 phosphorylates and inactivates pRb to de-repress E2F target genes; this activity requires an intact kinase and, in chondrocytes, drives pRb hyperphosphorylation, E2F target dysregulation and p53-dependent apoptosis [#12], while CCND1 has no cell-cycle activity independent of CDK6, and p27 arrests cells by blocking CDK6/CCND1 complex assembly [#16]. Beyond its canonical kinase role, CCND1 acts in the nucleus to remodel chromatin, sequestering HDAC1/HDAC2 away from the SOX11 locus to increase H3K9/K14 acetylation and SOX11 transcription in mantle cell lymphoma [#15]. CCND1 expression is controlled at every level. Transcription is activated through promoter elements bound by OCT4 [#25], phospho-CREB downstream of VRK1 [#10], a SETDB1\\u2013ERG complex [#24], AURKB-deposited H3S10ph marks [#19], MAZ phase-separated condensates nucleated on promoter G-quadruplexes that compartmentalize BRD4/MED1/CDK9/Pol II [#22], and \\u03b2-catenin signaling driven by JAM3\\u2013LRP5\\u2192AKT\\u2192GSK3\\u03b2 [#26], and is repressed by parafibromin [#9] and by JARID2-mediated H3K27me3 [#23]. mRNA fate is set by 3' UTR AU-rich elements and alternative polyadenylation [#5, #17], by m6A marks read by YTHDF3/written by METTL3 in the 5' UTR to promote translation [#20] and erased by FTO to prevent YTHDF2-dependent decay [#21], and by RNA-binding translational activators La [#11] and MYF5 [#14]. Protein abundance is governed by Thr286 phosphorylation-dependent ubiquitin\\u2013proteasome degradation, which is opposed by the USP10 deubiquitinase that removes K48-linked chains [#18]. CCND1 is the BCL-1 oncogene, identified through the t(11;14)/variant Ig translocations, and functions as an oncogene by overexpression of the wild-type protein rather than coding mutation [#3, #4]; overexpression arises from translocation, 3' UTR stabilization, or trans-acting regulation [#5, #8], and cancer-associated point mutations (E36K, Y44D, C47S) that block Thr286 phosphorylation further stabilize nuclear CCND1 and confer ibrutinib resistance [#13].\",\n  \"teleology\": [\n    {\n      \"year\": 1991,\n      \"claim\": \"Established that the PRAD1 gene product is a functional cyclin, answering whether this oncogene candidate had cyclin-kinase activity.\",\n      \"evidence\": \"p13suc1 bead pulldown and histone H1 kinase reconstitution in clam embryo lysates\",\n      \"pmids\": [\"1826542\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Used cdc2 rather than the physiological CDK4/6 partner\", \"Did not establish the cell-cycle phase of action in mammalian cells\"]\n    },\n    {\n      \"year\": 1992,\n      \"claim\": \"Linked CCND1 to G1 control by showing its expression is cell-cycle regulated, establishing when in the cycle it acts.\",\n      \"evidence\": \"Northern blot of synchronized HeLa and mammary epithelial cells\",\n      \"pmids\": [\"1383201\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Correlative expression timing, not a functional perturbation\", \"Did not identify the downstream substrate\"]\n    },\n    {\n      \"year\": 1993,\n      \"claim\": \"Defined the promoter architecture and showed CCND1 is oncogenic through wild-type overexpression, not coding mutation, settling the mechanism of its oncogene activity.\",\n      \"evidence\": \"Genomic cloning/promoter characterization and direct cDNA sequencing of overexpressed tumor transcripts\",\n      \"pmids\": [\"7687458\", \"8426754\", \"7621424\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Did not identify the trans-acting factors driving overexpression\", \"E2F motif function inferential at this stage\"]\n    },\n    {\n      \"year\": 1994,\n      \"claim\": \"Identified CCND1 as the BCL-1 oncogene and revealed 3' UTR rearrangement as a posttranscriptional overexpression mechanism, explaining how translocation deregulates the gene.\",\n      \"evidence\": \"Variant Ig translocation breakpoint mapping and actinomycin D mRNA half-life measurements in t(11;14) cell lines\",\n      \"pmids\": [\"8049438\", \"1394169\", \"8426477\", \"8204893\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Did not identify the trans-factors binding the AU-rich elements\", \"Half-life measured in cell lines, not primary tumors\"]\n    },\n    {\n      \"year\": 1996,\n      \"claim\": \"Placed CCND1 functionally upstream of pRb and demonstrated oncogenic collaboration, situating it within the cell-cycle and transformation network.\",\n      \"evidence\": \"MCL clinical specimen analysis (IHC/Western/Northern/flow) and rat fibroblast focus formation with ras and mutant p53\",\n      \"pmids\": [\"8623927\", \"8641982\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"pRb relationship inferred from correlation in patient samples\", \"Focus formation does not define the molecular mechanism of collaboration\"]\n    },\n    {\n      \"year\": 1998,\n      \"claim\": \"Showed that overexpression in copy-number-normal tumors is biallelic, establishing trans-acting regulation as a mechanism distinct from cis mutation.\",\n      \"evidence\": \"Allele-specific RT-PCR-RFLP at the NciI polymorphism in heterozygous tumor lines\",\n      \"pmids\": [\"9591636\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Did not identify the responsible trans-acting regulator\"]\n    },\n    {\n      \"year\": 2010,\n      \"claim\": \"Identified translational control of CCND1, showing RNA-binding proteins drive its synthesis beyond transcription.\",\n      \"evidence\": \"RIP, IRES-reporter assay, and rescue in CCND1-null cells for La\",\n      \"pmids\": [\"20856207\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"IRES mechanism vs cap-dependent contribution not quantified\", \"Tissue contexts of La-dependent control undefined\"]\n    },\n    {\n      \"year\": 2013,\n      \"claim\": \"Demonstrated that CCND1/CDK6 kinase activity is mechanistically required for pRb phosphorylation and downstream consequences in vivo.\",\n      \"evidence\": \"Chondrocyte-specific transgenic overexpression with kinase-dead mutants and p53-KO rescue\",\n      \"pmids\": [\"23624920\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Chondrocyte-specific; generalization to other lineages assumed\", \"Did not address CDK4 partnership\"]\n    },\n    {\n      \"year\": 2016,\n      \"claim\": \"Defined how cancer-associated point mutations stabilize CCND1 and confer drug resistance, linking Thr286-dependent degradation to therapy response.\",\n      \"evidence\": \"Site-directed mutagenesis with Thr286 phospho-Western, immunofluorescence, and ibrutinib viability assay; MYF5 RNA-binding/translation assays\",\n      \"pmids\": [\"27713153\", \"26819411\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Did not identify the relevant E3 ligase\", \"Ibrutinib resistance mechanism downstream of CCND1 not detailed\"]\n    },\n    {\n      \"year\": 2018,\n      \"claim\": \"Revealed non-canonical and multilayered control: CCND1 sequesters HDACs to remodel chromatin, requires CDK6 for cell-cycle function, and is regulated by APA, SETDB1-ERG, OCT4, and JAM3-driven \\u03b2-catenin signaling.\",\n      \"evidence\": \"Co-IP, ChIP for histone marks, CRISPR PAS editing, luciferase promoter mutagenesis, and genetic KO with serial transplantation across multiple systems\",\n      \"pmids\": [\"30530749\", \"30317923\", \"29717174\", \"33044755\", \"25128069\", \"29584620\", \"25939703\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"HDAC sequestration generality across loci unknown\", \"Many transcriptional inputs validated in single cancer contexts\"]\n    },\n    {\n      \"year\": 2020,\n      \"claim\": \"Established deubiquitination and chromatin/epigenetic transcriptional inputs as additional control points stabilizing CCND1 protein and activating its transcription.\",\n      \"evidence\": \"USP10 K48-ubiquitination and Co-IP assays; AURKB H3S10ph ChIP at CCND1 promoter with inhibitor and xenograft\",\n      \"pmids\": [\"33184448\", \"31982864\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"USP10 regulation upstream undefined\", \"AURKB study at Medium confidence with limited orthogonal validation\"]\n    },\n    {\n      \"year\": 2022,\n      \"claim\": \"Detailed m6A-dependent translational and stability control and G-quadruplex/condensate-driven transcription, defining the most recent layers of CCND1 regulation.\",\n      \"evidence\": \"Ythdf3-KO mouse with Ccnd1-rescue and m6A mapping; FTO m6A-RIP/stability assays; MAZ G4-binding and phase-separation mutagenesis with xenograft\",\n      \"pmids\": [\"35112553\", \"33651996\", \"38316778\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Interplay between m6A writers/erasers/readers at CCND1 not integrated\", \"Condensate mechanism studied in HCC only\"]\n    },\n    {\n      \"year\": null,\n      \"claim\": \"How the many transcriptional, RNA-stability, translational, and protein-stability inputs are integrated to set CCND1 levels in a given cell type, and which are tractable therapeutic nodes, remains unresolved.\",\n      \"evidence\": \"\",\n      \"pmids\": [],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"No unified quantitative model of competing regulatory inputs\", \"Physiological E3 ligase for Thr286-dependent degradation not identified in this corpus\", \"Endogenous CDK4 partnership not addressed in the timeline\"]\n    }\n  ],\n  \"mechanism_profile\": {\n    \"molecular_activity\": [\n      {\"term_id\": \"GO:0098772\", \"supporting_discovery_ids\": [0, 12, 16]},\n      {\"term_id\": \"GO:0140110\", \"supporting_discovery_ids\": [15]}\n    ],\n    \"localization\": [\n      {\"term_id\": \"GO:0005634\", \"supporting_discovery_ids\": [13, 15]}\n    ],\n    \"pathway\": [\n      {\"term_id\": \"R-HSA-1640170\", \"supporting_discovery_ids\": [1, 12, 16]},\n      {\"term_id\": \"R-HSA-1643685\", \"supporting_discovery_ids\": [3, 4, 13]}\n    ],\n    \"complexes\": [\"CDK6/cyclin D1\"],\n    \"partners\": [\"CDK6\", \"HDAC1\", \"HDAC2\", \"USP10\", \"CDKN1B\"],\n    \"other_free_text\": []\n  }\n}","audit_flag":null,"evaluation":{"pairwise":"win","faith_supported":4,"faith_total":6,"faith_pct":66.66666666666667}}