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Mutations in the MOF2/SUI1 gene affect both translation and nonsense-mediated mRNA decay

Y Cui1, C I González, T G Kinzy

  • 1Department of Molecular Genetics and Microbiology, University of Medicine and Dentistry of New Jersey, Robert Wood Johnson Medical School, Piscataway 08854, USA.

RNA (New York, N.Y.)
|June 22, 1999
PubMed

Insights

Cellular quality control pathways like nonsense-mediated mRNA decay (NMD) eliminate faulty transcripts. This study reveals that mutations in MOF genes, including MOF2 (SUI1), impair NMD activity, impacting mRNA turnover.

Area of Science:

  • Molecular Biology
  • Genetics
  • Cell Biology

Background:

  • Cells possess mechanisms to degrade aberrant proteins and transcripts.
  • Nonsense-mediated mRNA decay (NMD) is a key pathway for eliminating aberrant mRNAs.
  • In yeast, premature termination codons trigger mRNA degradation via NMD if a downstream sequence element (DSE) is present.

Purpose of the Study:

  • To investigate the effect of specific MOF gene alleles on NMD pathway activity.
  • To elucidate the role of the Mof2 protein (Sui1p) in NMD.
  • To explore the conserved function of Mof2p/Sui1p in mRNA quality control.

Main Methods:

  • Analysis of yeast strains harboring mof2-1, mof4-1, mof5-1, and mof8-1 alleles.
  • Characterization of the mof2-1 allele's impact on NMD efficiency.
  • Functional assessment of the human homolog of Mof2p/Sui1p in yeast NMD.

Main Results:

  • Strains with mof2-1, mof4-1, mof5-1, and mof8-1 alleles exhibited decreased NMD activity.
  • The mof2-1 allele specifically impairs NMD, indicating a role for Mof2p/Sui1p beyond translation initiation and elongation.
  • Wild-type Mof2p/Sui1p and its human homolog are crucial for activating NMD in yeast.

Conclusions:

  • The MOF genes, particularly MOF2/SUI1, are important regulators of the nonsense-mediated mRNA decay pathway.
  • Mof2p/Sui1p plays a dual role in translation and mRNA turnover via NMD.
  • Factors involved in NMD act as general modulators of translation and mRNA metabolism.

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