An RNA polymerase III-dependent heterochromatin barrier at fission yeast centromere 1.

Published online

Journal Article

Heterochromatin formation involves the nucleation and spreading of structural and epigenetic features along the chromatin fiber. Chromatin barriers and associated proteins counteract the spreading of heterochromatin, thereby restricting it to specific regions of the genome. We have performed gene expression studies and chromatin immunoprecipitation on strains in which native centromere sequences have been mutated to study the mechanism by which a tRNA(Alanine) gene barrier (cen1 tDNA(Ala)) blocks the spread of pericentromeric heterochromatin at the centromere of chromosome 1 (cen1) in the fission yeast, Schizosaccharomyces pombe. Within the centromere, barrier activity is a general property of tDNAs and, unlike previously characterized barriers, requires the association of both transcription factor IIIC and RNA Polymerase III. Although the cen1 tDNA(Ala) gene is actively transcribed, barrier activity is independent of transcriptional orientation. These findings provide experimental evidence for the involvement of a fully assembled RNA polymerase III transcription complex in defining independent structural and functional domains at a eukaryotic centromere.

Full Text

Duke Authors

Cited Authors

  • Scott, KC; White, CV; Willard, HF

Published Date

  • October 31, 2007

Published In

Volume / Issue

  • 2 / 10

Start / End Page

  • e1099 -

PubMed ID

  • 17971862

Electronic International Standard Serial Number (EISSN)

  • 1932-6203

Digital Object Identifier (DOI)

  • 10.1371/journal.pone.0001099

Language

  • eng

Conference Location

  • United States