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- W2023862162 abstract "Cyclin D1 deregulation is implicated in the genesis of multiple human cancers. Importantly, nuclear cyclin D1 retention during S-phase promotes DNA re-replication and subsequent genomic instability, providing a direct correlation between aberrant cyclin D1/CDK4 activity, transcriptional regulation and double strand DNA break (DSB) induction. Together, these molecular events catalyze the genomic instability necessary for neoplastic transformation. Given that replication-associated DNA damage is central to cyclin D1-driven neoplasia, inactivation of critical checkpoint mediators should augment cyclin D1-dependent tumorigenesis in vivo. To interrogate potential synergy between constitutively nuclear cyclin D1 expression and impaired DSB-induced checkpoint integrity, Ataxia Telangiectasia Mutated (ATM)-deficient mice harboring the Eμ-D1T286A transgene were generated and evaluated for tumor onset. Eμ-D1T286A/ATM−/− mice exhibit dramatically accelerated incidence of both B- and T-cell lymphomas relative to Eμ-D1T286A or ATM−/− control cohorts. Lymphomas exhibit clonal chromosomal alterations distinct from ATM−/− mice, which typically acquire translocations involving the Tcrα/δ locus during V(D)J recombination, and instead harbor alterations at the c-Myc locus. Collectively, these findings reveal an intricate relationship wherein nuclear cyclin D1/CDK4 drives genomic instability in the absence of ATM function and clonal selection of cells harboring alterations within the murine c-Myc locus, ultimately facilitating transformation and tumor formation." @default.
- W2023862162 created "2016-06-24" @default.
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- W2023862162 date "2013-01-14" @default.
- W2023862162 modified "2023-10-18" @default.
- W2023862162 title "ATM deficiency augments constitutively nuclear cyclin D1-driven genomic instability and lymphomagenesis" @default.
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- W2023862162 doi "https://doi.org/10.1038/onc.2012.577" @default.
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