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DNA damage-induced phosphorylation of CtIP at a conserved ATM/ATR site promotes lymphomagenesis in NHEJ/p53-double deficient mice


ABSTRACT: Human lymphoid malignancies are often characterized by oncogenic translocations involving the antigen receptor gene loci. CtIP is a DNA end-resection factor that has been widely implicated in alternative end-joining (A-EJ) mediated chromosomal translocations in reporters. The ATM and ATR kinases phosphorylate CtIP at T859 (T855 in mouse) and other sites to promote DNA end-resection. Using two classical non-homologous end-joining (cNHEJ) and Tp53-double deficient mouse models, we identified a role of CtIP T855 phosphorylation in the neonatal development of Xrcc4-/-Tp53-/- mice and the IgH-Myc translocation driven lymphomagenesis in DNA-PKcs-/-Tp53-/- mice. Mechanistically, we found that CtIP T855 phosphorylation is important for the progression of DNA end-resection, while dispensable for hairpin opening and inter-sister DNA break ligation. Moreover, we found that CtIP-T855 phosphorylation supports the proliferation of Myc-driven lymphoma cells by promoting the transition from ATM-mediated to ATR-mediated G2/M cell cycle checkpoint. Correspondingly, the CtIP-T855A mutation delays splenomegaly in l-Myc mice. Collectively, our findings suggest that DNA damage-induced CtIP phosphorylation has a checkpoint function during lymphomagenesis independent of its role in A-EJ-mediated chromosomal translocation

ORGANISM(S): Mus musculus

PROVIDER: GSE174496 | GEO | 2021/12/31

REPOSITORIES: GEO

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