DNA repair processes are critical mediators of p53-dependent tumor suppression.

Abstract:

:It has long been assumed that p53 suppresses tumor development through induction of apoptosis, possibly with contributions by cell cycle arrest and cell senescence1,2. However, combined deficiency in these three processes does not result in spontaneous tumor formation as observed upon loss of p53, suggesting the existence of additional mechanisms that are critical mediators of p53-dependent tumor suppression function3-5. To define such mechanisms, we performed in vivo shRNA screens targeting p53-regulated genes in sensitized genetic backgrounds. We found that knockdown of Zmat3, Ctsf and Cav1, promoted lymphoma/leukemia development only when PUMA and p21, the critical effectors of p53-driven apoptosis, cell cycle arrest and senescence, were also absent. Notably, loss of the DNA repair gene Mlh1 caused lymphoma in a wild-type background, and its enforced expression was able to delay tumor development driven by loss of p53. Further examination of direct p53 target genes implicated in DNA repair showed that knockdown of Mlh1, Msh2, Rnf144b, Cav1 and Ddit4 accelerated MYC-driven lymphoma development to a similar extent as knockdown of p53. Collectively, these findings demonstrate that extensive functional overlap of several p53-regulated processes safeguards against cancer and that coordination of DNA repair appears to be an important process by which p53 suppresses tumor development.

journal_name

Nat Med

journal_title

Nature medicine

authors

Janic A,Valente LJ,Wakefield MJ,Di Stefano L,Milla L,Wilcox S,Yang H,Tai L,Vandenberg CJ,Kueh AJ,Mizutani S,Brennan MS,Schenk RL,Lindqvist LM,Papenfuss AT,O'Connor L,Strasser A,Herold MJ

doi

10.1038/s41591-018-0043-5

subject

Has Abstract

pub_date

2018-07-01 00:00:00

pages

947-953

issue

7

eissn

1078-8956

issn

1546-170X

pii

10.1038/s41591-018-0043-5

journal_volume

24

pub_type

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