Targeting an E2F site in the mouse genome prevents promoter silencing in quiescent and post-mitotic cells.

Abstract:

:Previous studies have shown that the cell cycle-regulated B-myb promoter contains a conserved E2F binding site that is critical for repressing transcription in quiescent cells. To investigate its significance for permanent promoter silencing, we have inactivated this binding site in the mouse genome. Mice homozygous for the mutant B-mybmE2F allele were fully viable, however, B-myb transcription was derepressed during quiescence in mouse embryo fibroblasts (MEFs) derived from mutant animals. Moreover, it was found that mutation of the E2F site resulted in abnormal maintenance of B-myb expression in senescent MEFs and in differentiated brain tissue. These findings therefore reveal a direct and primary role for repressive E2F complexes in silencing gene expression in post-mitotic cells. Analysis of histone modifications at the promoter showed that histone H3 lysine 9 was constitutively acetylated throughout the cell cycle in homozygous mutant MEFs. This mouse system is the first description of an E2F site mutation in situ and will facilitate the study of E2F function in vivo.

journal_name

Oncogene

journal_title

Oncogene

authors

Tavner F,Frampton J,Watson RJ

doi

10.1038/sj.onc.1210087

subject

Has Abstract

pub_date

2007-04-26 00:00:00

pages

2727-35

issue

19

eissn

0950-9232

issn

1476-5594

pii

1210087

journal_volume

26

pub_type

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