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Related Experiment Videos

Did DNA replication evolve twice independently?

D D Leipe1, L Aravind, E V Koonin

  • 1National Center for Biotechnology Information, National Library of Medicine, National Institutes of Health, Building 38A, Bethesda, MD 20894, USA.

Nucleic Acids Research
|August 14, 1999
PubMed
Summary
This summary is machine-generated.

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The study reveals that while DNA replication shares functional similarities across bacteria and eukaryotes, key proteins differ, suggesting independent evolution. This implies the last common ancestor had DNA but likely didn't replicate it using modern methods.

Area of Science:

  • Molecular Biology
  • Evolutionary Biology
  • Genetics

Background:

  • DNA replication is fundamental to all cellular life, exhibiting functional similarities between bacterial and archaeal/eukaryotic systems.
  • However, significant divergence exists in core replication machinery components between bacteria and archaea/eukaryotes, unlike conserved transcription and translation proteins.
  • This divergence raises questions about the evolutionary history of DNA replication and its components.

Purpose of the Study:

  • To investigate the evolutionary conservation of DNA replication machinery components across different life domains.
  • To classify replication proteins based on their conservation patterns in bacteria versus archaea/eukaryotes.
  • To infer the nature of the last common ancestor's (LCA) genetic system and the evolution of DNA replication.

Related Experiment Videos

Main Methods:

  • Detailed sequence comparisons of indispensable DNA replication proteins.
  • Classification of proteins into four categories based on conservation between bacteria and archaea/eukaryotes.
  • Comparative analysis of homologous and non-homologous protein domains involved in replication.

Main Results:

  • Replication proteins were categorized into non-homologous (e.g., polymerases, primases), domain-homologous but non-orthologous (e.g., helicases), poorly conserved orthologs (e.g., sliding clamps), and highly conserved orthologs (e.g., clamp loaders).
  • Key replication enzymes like polymerases and primases show little homology, contrasting with conserved transcription/translation machinery.
  • Some replication components and DNA precursor biosynthesis enzymes are universally conserved, but principal polymerases are not.

Conclusions:

  • The LCA likely possessed DNA but did not replicate it using the modern double-stranded DNA replication system.
  • The LCA's genetic system may have included both RNA and DNA, with DNA synthesized via reverse transcription.
  • Modern double-stranded DNA replication systems probably evolved independently in the bacterial and archaeal/eukaryotic lineages.