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Codon bias confers stability to human mRNAs.

Fabian Hia1, Sheng Fan Yang1, Yuichi Shichino2

  • 1Department of Medical Chemistry, Graduate School of Medicine, Kyoto University, Kyoto, Japan.

EMBO Reports
|September 5, 2019
PubMed
Summary

Human cells regulate mRNA stability using codon bias, distinguishing between GC3 and AT3 codons. This two-pronged system, involving proteins ILF2 and ILF3, controls mRNA abundance.

Keywords:
GC-contentcodon biascodon optimalitymRNA stabilitytranslation efficiency

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Area of Science:

  • Molecular Biology
  • Genetics
  • Bioinformatics

Background:

  • Codon bias influences mRNA stability in model organisms.
  • Molecular mechanisms of codon bias in human mRNA stability are not well understood.

Purpose of the Study:

  • To investigate the role of codon bias in human mRNA stability.
  • To elucidate the molecular mechanisms by which codon bias affects RNA stability and abundance.

Main Methods:

  • Bioinformatics analysis to cluster codons based on GC3 and AT3 content.
  • Ribosome profiling and in vitro assays to analyze mRNA regulation.
  • Immunoprecipitation to identify RNA-binding proteins.

Main Results:

  • Codons were classified into GC3 (stabilizing) and AT3 (destabilizing) groups.
  • Two distinct modes of mRNA regulation were identified: GC3-dependent and GC-content dependent.
  • ILF2 and ILF3 were identified as key RNA-binding proteins regulating mRNA abundance based on codon bias.

Conclusions:

  • Human cells utilize a unique codon bias mechanism to modulate RNA stability.
  • Codon bias acts as a two-pronged system, with GC3 and GC-content influencing mRNA abundance.
  • ILF2 and ILF3 play critical roles in codon bias-mediated mRNA regulation.