Journal of Molecular Evolution

, Volume 72, Issue 2, pp 138–146

Evolution of Prokaryotic Genes by Shift of Stop Codons

  • Anna A. Vakhrusheva
  • Marat D. Kazanov
  • Andrey A. Mironov
  • Georgii A. Bazykin
Article

Abstract

De novo origin of coding sequence remains an obscure issue in molecular evolution. One of the possible paths for addition (subtraction) of DNA segments to (from) a gene is stop codon shift. Single nucleotide substitutions can destroy the existing stop codon, leading to uninterrupted translation up to the next stop codon in the gene’s reading frame, or create a premature stop codon via a nonsense mutation. Furthermore, short indels-caused frameshifts near gene’s end may lead to premature stop codons or to translation past the existing stop codon. Here, we describe the evolution of the length of coding sequence of prokaryotic genes by change of positions of stop codons. We observed cases of addition of regions of 3′UTR to genes due to mutations at the existing stop codon, and cases of subtraction of C-terminal coding segments due to nonsense mutations upstream of the stop codon. Many of the observed stop codon shifts cannot be attributed to sequencing errors or rare deleterious variants segregating within bacterial populations. The additions of regions of 3′UTR tend to occur in those genes in which they are facilitated by nearby downstream in-frame triplets which may serve as new stop codons. Conversely, subtractions of coding sequence often give rise to in-frame stop codons located nearby. The amino acid composition of the added region is significantly biased, compared to the overall amino acid composition of the genes. Our results show that in prokaryotes, shift of stop codon is an underappreciated contributor to functional evolution of gene length.

Keywords

Stop codons Evolution Prokaryotes Frameshifts Tandem stop codons Stop codon read-through Translation termination 3′UTR Gene length 

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Copyright information

© Springer Science+Business Media, LLC 2010

Authors and Affiliations

  • Anna A. Vakhrusheva
    • 1
  • Marat D. Kazanov
    • 2
    • 3
  • Andrey A. Mironov
    • 1
    • 2
    • 4
  • Georgii A. Bazykin
    • 1
    • 2
  1. 1.Department of Bioengineering and BioinformaticsM.V. Lomonosov Moscow State UniversityMoscowRussia
  2. 2.Institute for Information Transmission ProblemsRussian Academy of SciencesMoscowRussia
  3. 3.Sanford-Burnham Medical Research InstituteLa JollaUSA
  4. 4.State Research Institute for Genetics and Selection of Industrial Microorganisms “GosNIIGenetika”MoscowRussia

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