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Splicing is the process by which eukaryotic RNA is edited before its translation into protein. The RNA strand transcribed from eukaryotic DNA is called the primary transcript. The primary transcripts that become mRNAs are called precursor messenger RNAs (pre-mRNAs). Eukaryotic pre-mRNA contains alternating sequences of exons and introns. Exons are nucleotide sequences that code for proteins, whereas introns are the non-coding regions. In RNA splicing, introns are removed and exons are bonded...
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Evolutionarily Developed Alternatively Spliced Exons Containing Translation Initiation Sites.

Jun-Ichi Takeda1, Takaaki Okamoto2,3, Akio Masuda2

  • 1Center for One Medicine Innovative Translational Research (COMIT), Institute for Advanced Study, Gifu University, 1-1 Yanagido, Gifu 501-1193, Japan.

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Summary
This summary is machine-generated.

This study identifies alternatively skipped exons harboring translation initiation codons (5UC-ASEs), revealing a novel gene expression regulation mechanism. These exons are controlled by MATR3, particularly in the brain, and play a role in autoregulation.

Keywords:
MATR3alternative splicingautoregulationlarge exonvertebrate evolution

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Area of Science:

  • Molecular Biology
  • Genetics
  • Gene Regulation

Background:

  • Alternative splicing generates diverse protein isoforms crucial for development.
  • Exons with translation initiation codons are affected by alternative splicing, but remain understudied.

Purpose of the Study:

  • To systematically classify human alternative exons based on coding information.
  • To investigate the function and regulation of alternatively skipped exons harboring translation initiation codons (5UC-ASEs).

Main Methods:

  • Systematic classification of human alternative exons using coding information.
  • Analysis of splicing regulation by MATR3.
  • Evolutionary analysis of 5UC-ASEs.

Main Results:

  • Over 5% of cassette exons are 5UC-ASEs, whose skipping eliminates translation initiation sites.
  • MATR3 represses 5UC-ASE splicing, with distinct regulation in brain, muscle, and testis.
  • MATR3 autoregulates its expression by skipping a 5UC-ASE in its own gene.
  • 5UC-ASEs are larger than other alternative exons and have an ancient evolutionary origin.

Conclusions:

  • Identified 5UC-ASEs as a unique class of alternative exons.
  • Established MATR3-mediated repression of 5UC-ASE splicing as a gene expression control mechanism.
  • Highlighted the evolutionary significance and tissue-specific regulation of 5UC-ASEs.