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Evolution of the genetic code in yeasts.

Isabel Miranda1, Raquel Silva, Manuel A S Santos

  • 1Department of Biology, University of Aveiro, 3810-193 Aveiro, Portugal.

Yeast (Chichester, England)
|February 25, 2006
PubMed
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The genetic code is not universal. A specific yeast tRNA mutation changed a leucine codon to serine, impacting Candida evolution over 272 million years ago.

Area of Science:

  • Genetics
  • Molecular Biology
  • Evolutionary Biology

Background:

  • The genetic code, once thought universal, has known variations in bacteria and eukaryotes.
  • Specific mitochondrial genetic code changes occur in yeasts, like UGA to tryptophan and CUN codons to threonine.
  • Recent discoveries reveal cytoplasmic genetic code alterations in Candida and Debaryomyces species.

Purpose of the Study:

  • To review recent findings on a unique genetic code alteration in yeast cytoplasm.
  • To explore the evolutionary pressures and molecular mechanisms behind this code change.
  • To understand the impact of this alteration on yeast evolution.

Main Methods:

  • Review of recent scientific literature and concepts.
  • Analysis of tRNA gene structure and function.

Related Experiment Videos

  • Phylogenetic analysis to date the genetic event.

    • Main Results:

    • A novel serine-tRNA (ser-tRNACAG) with a leucine anticodon was identified.
    • This tRNA resulted from an adenosine insertion in its gene's intron.
    • The event, dated ~272 million years ago, reprogrammed ~30,000 CUG codons.

    Conclusions:

    • This genetic code change significantly impacted the evolution of Candida and related species.
    • The study of this alteration provides insights into the dynamic evolution of the genetic code.
    • Understanding these changes challenges the notion of a frozen genetic lexicon.