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UPF3 suppresses aberrant spliced mRNA in Arabidopsis

Koichi Hori1, Yuichiro Watanabe

  • 1Department of Life Science, Graduate School of Arts and Sciences, University of Tokyo, Komaba, Meguro, Tokyo 153-8902, Japan.

The Plant Journal : for Cell and Molecular Biology
|August 16, 2005
PubMed

Insights

Plants possess a nonsense-mediated mRNA decay (NMD) system to eliminate faulty mRNAs. This study shows the AtUPF3 gene is crucial for plant NMD to degrade aberrant mRNAs with premature termination codons.

Area of Science:

  • Molecular Biology
  • Genetics
  • Plant Science

Background:

  • Eukaryotic organisms utilize nonsense-mediated mRNA decay (NMD) to prevent the translation of aberrant messenger RNAs (mRNAs) containing premature termination codons (PTCs).
  • The NMD pathway relies on conserved proteins like UPF1, UPF2, and UPF3, which are essential in mammals and yeast.
  • These UPF proteins and the NMD pathway are also present in plants, suggesting a conserved role in RNA surveillance.

Purpose of the Study:

  • To investigate the role of the AtUPF3 gene in the plant NMD pathway.
  • To identify and analyze alternative splicing variants containing PTCs in Arabidopsis thaliana.
  • To determine if AtUPF3 is required for the degradation of aberrant mRNAs in plants.

Main Methods:

  • Searched 'The Arabidopsis Information Resource' database for mRNAs with PTCs.
  • Selected five candidate mRNAs and verified the presence of PTCs in vivo.
  • Analyzed the ratio of alternative splicing variants with (PTC+) and without (PTC-) PTCs in wild-type and atupf3 mutant Arabidopsis plants.

Main Results:

  • Identified alternative splicing variants producing both PTC+ and PTC- mRNAs for each selected gene.
  • Observed higher PTC+/PTC- ratios in atupf3 mutant plants compared to wild-type plants.
  • Demonstrated that atupf3 mutant plants exhibit reduced degradation of mRNAs with PTCs.

Conclusions:

  • The AtUPF3 gene is essential for the plant NMD system.
  • AtUPF3 plays a critical role in degrading aberrantly spliced mRNAs containing PTCs in Arabidopsis.
  • This finding highlights the conserved function of UPF3 in NMD across eukaryotes.

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