Role of Ccr4-Not complex in heterochromatin formation at meiotic genes and subtelomeres in fission yeast

Epigenetics & Chromatin

Juan Mata²  Jürg Bähler³  Masayuki Yamamoto¹  Akira Yamashita¹  Ayesha Hasan²  Caia Duncan²  María Rodríguez-López³  Cristina Cotobal² 

[1] Laboratory of Cell Responses, National Institute for Basic Biology, Okazaki, Japan;Department of Biochemistry, University of Cambridge, Cambridge, UK;Department of Genetics, Evolution and Environment, UCL Cancer Institute, University College London, London, UK

关键词: S. pombe;    Heterochromatin;    ChIP-seq;    RIP-chip;    Genome-wide approaches;    Ccr4-Not complex;   

Others  :  1223303
DOI  :  10.1186/s13072-015-0018-4

 received in 2015-07-06, accepted in 2015-07-22,  发布年份 2015

【 摘 要 】

Background

Heterochromatin is essential for chromosome segregation, gene silencing and genome integrity. The fission yeast Schizosaccharomyces pombe contains heterochromatin at centromeres, subtelomeres, and mating type genes, as well as at small islands of meiotic genes dispersed across the genome. This heterochromatin is generated by partially redundant mechanisms, including the production of small interfering RNAs (siRNAs) that are incorporated into the RITS protein complex (RNAi-Induced Transcriptional Silencing). The assembly of heterochromatin islands requires the function of the RNA-binding protein Mmi1, which recruits RITS to its mRNA targets and to heterochromatin islands. In addition, Mmi1 directs its targets to an exosome-dependent RNA elimination pathway.

Results

Ccr4-Not is a conserved multiprotein complex that regulates gene expression at multiple levels, including RNA degradation and translation. We show here that Ccr4-Not is recruited by Mmi1 to its RNA targets. Surprisingly, Ccr4 and Caf1 (the mRNA deadenylase catalytic subunits of the Ccr4-Not complex) are not necessary for the degradation or translation of Mmi1 RNA targets, but are essential for heterochromatin integrity at Mmi1-dependent islands and, independently of Mmi1, at subtelomeric regions. Both roles require the deadenylase activity of Ccr4 and the Mot2/Not4 protein, a ubiquitin ligase that is also part of the complex. Genetic evidence shows that Ccr4-mediated silencing is essential for normal cell growth, indicating that this novel regulation is physiologically relevant. Moreover, Ccr4 interacts with components of the RITS complex in a Mmi1-independent manner.

Conclusions

Taken together, our results demonstrate that the Ccr4-Not complex is required for heterochromatin integrity in both Mmi1-dependent and Mmi1-independent pathways.

【 授权许可】

   
2015 Cotobal et al.

【 图 表 】

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