p53, mutation frequency and apoptosis in the murine small intestine.

Abstract:

:Normal function of the p53 gene is integral to the cellular response to genotoxic stress. One prediction arising from this is that p53 deficiency results in an increased mutation frequency. However, limited evidence has been produced in support of this idea. In order to further investigate the in vivo role of p53 in surveillance against mutation, and particularly to address the significance of p53-dependent apoptosis, we scored mutation frequency at the Dlb-1 locus within cells of the intestinal epithelium of animals which were wild type, heterozygous or null for p53 and heterozygous (a/b) at the Dlb-1 locus. Using this assay we have shown that loss of a p53-dependent apoptotic pathway is associated with the detectable acquisition of mutations, but only at high levels of DNA damage. These results question the significance of the immediate 'wave' of p53-dependent apoptosis seen in this tissue, particularly as there was a delayed p53-independent apoptotic pathway. We conclude that loss of p53 function only becomes relevant to the in vivo acquisition of mutations and thus tumorigenesis in certain circumstances.

journal_name

Oncogene

journal_title

Oncogene

authors

Clarke AR,Howard LA,Harrison DJ,Winton DJ

doi

10.1038/sj.onc.1201040

subject

Has Abstract

pub_date

1997-05-01 00:00:00

pages

2015-8

issue

17

eissn

0950-9232

issn

1476-5594

journal_volume

14

pub_type

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