Transcriptional silencing in Saccharomyces cerevisiae: known unknowns.

Publisher: BioMed Central Country of Publication: England NLM ID: 101471619 Publication Model: Electronic Cited Medium: Internet ISSN: 1756-8935 (Electronic) Linking ISSN: 17568935 NLM ISO Abbreviation: Epigenetics Chromatin Subsets: MEDLINE

Original Publication: [London] : BioMed Central

Saccharomyces cerevisiae*/genetics ; Saccharomyces cerevisiae*/metabolism ; Gene Silencing* ; Silent Information Regulator Proteins, Saccharomyces cerevisiae*/metabolism ; Silent Information Regulator Proteins, Saccharomyces cerevisiae*/genetics ; Gene Expression Regulation, Fungal*; Transcription, Genetic ; Chromatin/metabolism ; Saccharomyces cerevisiae Proteins/metabolism ; Saccharomyces cerevisiae Proteins/genetics ; Promoter Regions, Genetic ; Repressor Proteins/metabolism ; Repressor Proteins/genetics

Transcriptional silencing in Saccharomyces cerevisiae is a persistent and highly stable form of gene repression. It involves DNA silencers and repressor proteins that bind nucleosomes. The silenced state is influenced by numerous factors including the concentration of repressors, nature of activators, architecture of regulatory elements, modifying enzymes and the dynamics of chromatin.Silencers function to increase the residence time of repressor Sir proteins at silenced domains while clustering of silenced domains enables increased concentrations of repressors and helps facilitate long-range interactions. The presence of an accessible NDR at the regulatory regions of silenced genes, the cycling of chromatin configurations at regulatory sites, the mobility of Sir proteins, and the non-uniform distribution of the Sir proteins across the silenced domain, all result in silenced chromatin that only stably silences weak promoters and enhancers via changes in transcription burst duration and frequency.These data collectively suggest that silencing is probabilistic and the robustness of silencing is achieved through sub-optimization of many different nodes of action such that a stable expression state is generated and maintained even though individual constituents are in constant flux.
(© 2024. The Author(s).)

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COR CFA University of California, Santa Cruz

0 (Silent Information Regulator Proteins, Saccharomyces cerevisiae)
0 (Chromatin)
0 (Saccharomyces cerevisiae Proteins)
0 (Repressor Proteins)

Date Created: 20240913 Date Completed: 20240914 Latest Revision: 20240916

20240916

PMC11401328

10.1186/s13072-024-00553-7

39272151