Tight protein-DNA interactions favor gene silencing.

Abstract:

:The heterochromatin-like structure formed by the yeast silent information regulator complex (SIR) represses transcription at the silent mating type loci and telomeres. Here, we report that tight protein-DNA complexes induce ectopic recruitment of the SIR complex, promoting gene silencing and changes in subnuclear localization when cis-acting elements are nearby. Importantly, lack of the replication fork-associated helicase Rrm3 enhances this induced gene repression. Additionally, Sir3 and Sir4 are enriched genome-wide at natural replication pause sites, including tRNA genes. Consistently, inserting a tRNA gene promotes SIR-mediated silencing of a nearby gene. These results reveal that replication stress arising from tight DNA-protein interactions favors heterochromatin formation.

journal_name

Genes Dev

journal_title

Genes & development

authors

Dubarry M,Loïodice I,Chen CL,Thermes C,Taddei A

doi

10.1101/gad.611011

subject

Has Abstract

pub_date

2011-07-01 00:00:00

pages

1365-70

issue

13

eissn

0890-9369

issn

1549-5477

pii

25/13/1365

journal_volume

25

pub_type

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