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An Integrated Approach for Microprotein Identification and Sequence Analysis
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Identification of unannotated coding sequences and their physiological functions.

Kazuya Ichihara1, Keiichi I Nakayama1, Akinobu Matsumoto1

  • 1Division of Cell Biology, Medical Institute of Bioregulation, Kyushu University, Fukuoka, Fukuoka 819-0395, Japan.

Journal of Biochemistry
|August 12, 2022
PubMed
Summary

Many non-coding RNAs are translated into small proteins, challenging traditional gene prediction. New methods identify these unannotated coding sequences (CDSs) and their physiological roles.

Keywords:
long noncoding RNA (lncRNA)near-cognate initiation codonpolypeptideribosome profilingtranslation

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Area of Science:

  • Genomics
  • Proteomics
  • Molecular Biology

Background:

  • Traditional gene prediction relies on minimum length and AUG start codons.
  • Recent evidence shows RNAs longer than non-coding RNAs can encode small proteins (<100 amino acids).
  • Near-cognate initiation codons (e.g., CUG, GUG) are utilized for protein translation.

Approach:

  • Ribosome profiling and mass spectrometry identify actively translated sequences.
  • Analysis of genetically engineered mouse models reveals physiological functions.
  • This review details novel methods for discovering unannotated coding sequences (unannotated CDSs).

Key Points:

  • Unannotated CDSs can produce functional polypeptides, expanding the proteome.
  • Small proteins translated from non-canonical start codons play significant physiological roles.
  • Advanced techniques are crucial for identifying these previously overlooked coding regions.

Conclusions:

  • The definition of a protein-coding sequence (CDS) needs re-evaluation.
  • Discovering unannotated CDSs opens new avenues for understanding biological processes.
  • Further research into small proteins and alternative translation initiation is essential.