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The Epigenetic Pathways to Ribosomal DNA Silencing.


ABSTRACT: Heterochromatin is the transcriptionally repressed portion of eukaryotic chromatin that maintains a condensed appearance throughout the cell cycle. At sites of ribosomal DNA (rDNA) heterochromatin, epigenetic states contribute to gene silencing and genome stability, which are required for proper chromosome segregation and a normal life span. Here, we focus on recent advances in the epigenetic regulation of rDNA silencing in Saccharomyces cerevisiae and in mammals, including regulation by several histone modifications and several protein components associated with the inner nuclear membrane within the nucleolus. Finally, we discuss the perturbations of rDNA epigenetic pathways in regulating cellular aging and in causing various types of diseases.

SUBMITTER: Srivastava R 

PROVIDER: S-EPMC4981667 | biostudies-literature | 2016 Sep

REPOSITORIES: biostudies-literature

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The Epigenetic Pathways to Ribosomal DNA Silencing.

Srivastava Rakesh R   Srivastava Rashmi R   Ahn Seong Hoon SH  

Microbiology and molecular biology reviews : MMBR 20160601 3


Heterochromatin is the transcriptionally repressed portion of eukaryotic chromatin that maintains a condensed appearance throughout the cell cycle. At sites of ribosomal DNA (rDNA) heterochromatin, epigenetic states contribute to gene silencing and genome stability, which are required for proper chromosome segregation and a normal life span. Here, we focus on recent advances in the epigenetic regulation of rDNA silencing in Saccharomyces cerevisiae and in mammals, including regulation by several  ...[more]

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