Evolution of relative reading frame bias in unidirectional prokaryotic gene overlaps

Peter J. A. Cock, David Edward Whitworth

Research output: Contribution to journalArticlepeer-review

11 Citations (SciVal)

Abstract

Pairs of unidirectional (same strand) genes can overlap in one of two phases (relative reading frames). There is a striking bias in the relative abundance of prokaryotic gene overlaps in the two possible phases. A simple model is presented based on unidirectional gene overlaps evolving from nonoverlapping gene pairs, through the adoption of alternative start codons by the downstream genes. Potential alternative start codons within upstream gene sequences were found to occur at greater frequencies in one phase, corresponding to the most prevalent phase of gene overlaps. We therefore suggest that the phase bias of overlapping genes is primarily a consequence of the N-terminal extension of downstream genes through adoption of new start codons.
Original languageEnglish
Pages (from-to)753-756
Number of pages4
JournalMolecular Biology and Evolution
Volume27
Issue number4
Early online date14 Dec 2009
DOIs
Publication statusPublished - 2010

Keywords

  • annotation
  • overlaps
  • start codon
  • phase
  • reading frame

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