Importance of polyadenylation in the selective elimination of meiotic mRNAs in growing S. pombe cells

Soichiro Yamanaka, Akira Yamashita, Yuriko Harigaya, Ryo Iwata, Masayuki Yamamoto

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86 Citations (Scopus)

Abstract

A number of meiosis-specific mRNAs are initially weakly transcribed, but then selectively removed during fission yeast mitotic growth. These mRNAs harbour a region termed DSR (determinant of selective removal), which is recognized by the YTH family RNA-binding protein Mmi1p. Mmi1p directs the destruction of these mRNAs in collaboration with nuclear exosomes. However, detailed molecular mechanisms underlying this process of selective mRNA elimination have remained elusive. In this study, we demonstrate the critical role of polyadenylation in this process. Two-hybrid and genetic screens revealed potential interactions between Mmi1p and proteins involved in polyadenylation. Additional investigations showed that destruction of DSR-containing mRNAs by exosomes required polyadenylation by a canonical poly(A) polymerase. The recruitment of Pab2p, a poly(A)-binding protein, to the poly(A) tail was also necessary for mRNA destruction. In cells undergoing vegetative growth, Mmi1p localized with exosomes, Pab2p, and components of the polyadenylation complex in several patchy structures in the nucleoplasm. These patches may represent the sites for degradation of meiosis-specific mRNAs with untimely expression.

Original languageEnglish
Pages (from-to)2173-2181
Number of pages9
JournalEMBO Journal
Volume29
Issue number13
DOIs
Publication statusPublished - 2010 Jul 7

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Keywords

  • exosome
  • fission yeast
  • mRNA degradation
  • meiosis
  • polyadenylation

ASJC Scopus subject areas

  • Neuroscience(all)
  • Molecular Biology
  • Biochemistry, Genetics and Molecular Biology(all)
  • Immunology and Microbiology(all)

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