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Determinants of Nam8-dependent splicing of meiotic pre-mRNAs

Zhicheng R Qiu1, Beate Schwer, Stewart Shuman

  • 1Sloan-Kettering Institute, Weill Cornell Medical College, New York, NY 10065, USA.

Nucleic Acids Research
|January 7, 2011
PubMed

Insights

Nam8 protein is crucial for yeast meiotic splicing, regulating distinct gene targets like SPO22 and PCH2 through different mechanisms. This research uncovers new roles for Nam8 in meiotic gene regulation.

Area of Science:

  • Molecular Biology
  • Genetics
  • RNA Splicing

Background:

  • Nam8, a U1 snRNP component, is essential for meiotic growth in yeast.
  • It collaborates with Mer1 to splice key meiotic mRNAs (AMA1, MER2, MER3).

Purpose of the Study:

  • Identify novel targets of Nam8-dependent meiotic splicing.
  • Elucidate the distinct mechanisms of Nam8-mediated splicing for SPO22 and PCH2.

Main Methods:

  • Identification of novel meiotic splicing targets.
  • Analysis of splice site recognition and enhancer elements.
  • Mutagenesis studies of protein domains and RNA sequences.
  • Investigating the role of Nam8 domains (RRM1, RRM2, RRM3) in splicing.

Main Results:

  • SPO22 and PCH2 identified as new Nam8 targets.
  • SPO22 splicing requires both Nam8 and Mer1, dependent on a non-consensus 5'SS and Mer1 enhancer.
  • PCH2 splicing is Nam8-dependent but Mer1-independent, influenced by a long 5' exon and non-consensus branchpoint.
  • Nam8's N-terminal leader, C-terminal tail, and RRM1 domain are dispensable for meiotic splicing.
  • Mutations in RRM2 and RRM3 RNA binding sites impair Nam8 activity.

Conclusions:

  • Nam8 regulates at least two distinct meiotic splicing pathways.
  • The mechanisms involve differential recognition of splice sites and enhancers.
  • Nam8's RRM2 and RRM3 domains are critical for its meiotic function.

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