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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