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PMID: 9925638 Published · ppublish English Journal Article Research Support, U.S. Gov't, P.H.S.

Telomeric chromatin modulates replication timing near chromosome ends.

Genes & development ·Vol. 13 ·No. 2 ·1999-01-15 ·Pages 146-51

Stevenson JB, Gottschling DE

Abstract

Saccharomyces cerevisiae telomeric DNA replicates late in S phase, and telomeric genes are transcriptionally silent. Transcriptional repression of telomere-proximal genes results from silent chromatin initiating at the chromosome end, but the relationship between telomeric chromatin and DNA replication is unknown. Mutations in SIR3, a silent chromatin component, cause telomeric DNA on chromosome V to replicate much earlier because of earlier initiation of a nearby replication origin, the Y' ARS. A second telomere-proximal ARS, from an X element, does not act as an origin in a wild-type strain, whereas in a sir3 cell it does. We conclude that telomeric chromatin has a Sir3-dependent inhibitory effect on DNA replication.

MeSH Terms
Chromatin/genetics DNA Replication/genetics Fungal Proteins/genetics,metabolism Mutation Replication Origin/genetics Repressor Proteins/metabolism S Phase Saccharomyces cerevisiae/cytology,genetics,metabolism Silent Information Regulator Proteins, Saccharomyces cerevisiae Telomere/genetics Time Factors Trans-Activators/genetics,metabolism Transcription, Genetic/genetics
Chemicals
Chromatin Fungal Proteins Repressor Proteins SIR3 protein, S cerevisiae Silent Information Regulator Proteins, Saccharomyces cerevisiae Trans-Activators
Authors & Affiliations
2 authors, click to expand affiliations / ORCID
Stevenson J B
Department of Molecular Genetics and Cell Biology, The University of Chicago, Chicago, Illinois 60637 USA.
Gottschling D E
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Article Info
Journal
Genes & development
Abbr.
Genes Dev
ISSN
0890-9369
Published
1999-01-15
Pages
146-51
Language
English
Region
United States
NLM ID
8711660
PMCID
PMC316395
Subset
IM
Grants
NIGMS NIH HHS · GM43893 · United States
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