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Related Experiment Videos

Aminoacyl-tRNA synthetases, the genetic code, and the evolutionary process.

C R Woese1, G J Olsen, M Ibba

  • 1Department of Microbiology, University of Illinois, Urbana, Illinois 61801, USA.

Microbiology and Molecular Biology Reviews : MMBR
|March 8, 2000
PubMed
Summary
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Aminoacyl-tRNA synthetases (AARSs) offer insights into evolution, showing distinct bacterial and archaeal types. Their gene transfers reveal early life evolved communally before domains formed.

Area of Science:

  • Evolutionary biology
  • Molecular biology
  • Genetics

Background:

  • Aminoacyl-tRNA synthetases (AARSs) are crucial enzymes linking amino acids to their cognate tRNAs.
  • The genetic code's structure is highly organized, prompting questions about its evolutionary origins.
  • Understanding AARS evolution can illuminate early cellular life and genetic code development.

Purpose of the Study:

  • To examine the evolutionary relationships of AARSs and their connection to the genetic code.
  • To investigate the phylogenetic profiles of individual AARSs and their implications.
  • To analyze horizontal gene transfer patterns among AARSs in Bacteria and Archaea.

Main Methods:

  • Phylogenetic analysis of individual AARS gene families.
  • Comparative analysis of AARS evolutionary relationships against organismal phylogeny.
Keywords:
Non-programmatic

Related Experiment Videos

  • Examination of horizontal gene transfer events between bacterial and archaeal domains.

    • Main Results:

    • AARS evolutionary relationships largely align with organismal phylogeny, showing a clear bacterial-archaeal distinction.
    • Individual AARS evolutionary profiles differ, reflecting distinct fixation times of their taxonomic distributions.
    • Horizontal gene transfer of AARS genes is asymmetric, with more archaeal-to-bacterial transfer, particularly for the 'gemini group'.
    • Extensive gene transfers occurred early in evolution, predating or coinciding with the formation of primary organismal domains.

    Conclusions:

    • The genetic code's structure is too complex to be solely explained by AARS enzyme evolution.
    • AARS evolutionary patterns support a model of early life evolving communally with less restricted genetic exchange.
    • Findings refine theories on primitive cell evolution and the origins of the universal phylogenetic tree.