Sir-mediated repression can occur independently of chromosomal and subnuclear contexts.
Cell
; 119(7): 955-67, 2004 Dec 29.
Article
en En
| MEDLINE
| ID: mdl-15620354
ABSTRACT
Epigenetic mechanisms silence the HM mating-type loci in budding yeast. These loci are tightly linked to telomeres, which are also repressed and held together in clusters at the nuclear periphery, much like mammalian heterochromatin. Yeast telomere anchoring can occur in the absence of silent chromatin through the DNA end binding factor Ku. Here we examine whether silent chromatin binds the nuclear periphery independently of telomeres and whether silencing persists in the absence of anchorage. HMR was excised from the chromosome by inducible site-specific recombination and tracked by real-time fluorescence microscopy. Silent rings associate with the nuclear envelope, while nonsilent rings move freely throughout the nucleus. Silent chromatin anchorage requires the action of either Ku or Esc1. In the absence of both proteins, rings move throughout the nucleoplasm yet remain silent. Thus, transcriptional repression can be sustained without perinuclear anchoring.
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Colección:
01-internacional
Base de datos:
MEDLINE
Asunto principal:
Proteínas Represoras
/
Cromosomas Fúngicos
/
Núcleo Celular
/
Silenciador del Gen
/
Proteínas Reguladoras de Información Silente de Saccharomyces cerevisiae
Idioma:
En
Revista:
Cell
Año:
2004
Tipo del documento:
Article
País de afiliación:
Estados Unidos