Recent emergence of the modern genetic code: A proposal

Research output: Contribution to journalArticle

11 Citations (Scopus)

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

Fingerprint

Genetic Code
Horizontal Gene Transfer
Arginine
Arginine-tRNA Ligase
Tryptophan-tRNA Ligase
Archaea
Phylogeny
Eukaryota
Tryptophan
Bacteria
Pressure
Enzymes
Genes

ASJC Scopus subject areas

  • Genetics

Cite this

Recent emergence of the modern genetic code : A proposal. / Syvanen, Michael.

In: Trends in Genetics, Vol. 18, No. 5, 01.05.2002, p. 245-248.

Research output: Contribution to journalArticle

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