Recent emergence of the modern genetic code: A proposal

Research output: Contribution to journalArticle

11 Scopus citations

Abstract

This article proposes that the genetic code was not fully formed before the divergence of life into three kingdoms. Rather, at least arginine and tryptophan evolved after the diversification of archaea, bacteria and eukaryotes, and were spread by horizontal gene transfer. Evidence for this hypothesis is based on data suggesting that enzymes for biosynthesis of arginine and tryptophan, and for arginine tRNA ligase, have shorter divergence times than the underlying lineages. Also, many of these genes display 'star' phylogenies. This proposal is an extension of the idea that the genetic code was unified because of the evolutionary pressure from horizontal gene transfer. These considerations further undermine the need to postulate the existence of a 'last common ancestor'; a simpler model would be that multiple lineages gave rise to life today.

Original languageEnglish (US)
Pages (from-to)245-248
Number of pages4
JournalTrends in Genetics
Volume18
Issue number5
DOIs
StatePublished - May 1 2002

ASJC Scopus subject areas

  • Genetics

Fingerprint Dive into the research topics of 'Recent emergence of the modern genetic code: A proposal'. Together they form a unique fingerprint.

  • Cite this