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Evolution and degeneration of eukaryotic DNA replication system.

Masaharu Takemura1

  • 1Laboratory of Cancer Cell Biology, Research Institute for Disease Mechanism and Control, Nagoya University Graduate School of Medicine, Tsurumai-cho 65, Showa-ku, Nagoya, Aichi 466-8550, Japan. takemura@med.nagoya-u.ac.jp

Bio Systems
|June 19, 2002
PubMed
Summary

The study suggests that eukaryotic DNA polymerase alpha may have originated from symbiotic contacts and is now degenerating. DNA polymerase delta shows conserved domains absent in alpha, indicating a potential evolutionary divergence.

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Area of Science:

  • Molecular Biology
  • Evolutionary Biology
  • Biochemistry

Background:

  • Eukaryotic cells possess multiple DNA polymerases, including alpha, delta, and epsilon, crucial for nuclear DNA replication.
  • The evolutionary origins of this complex polymerase system remain largely unexplained.

Purpose of the Study:

  • To investigate the evolutionary past and future of eukaryotic DNA polymerases.
  • To explore the relationship between DNA polymerase alpha and delta in the context of molecular evolution.

Main Methods:

  • Comparative analysis of conserved nucleotides and amino acids in DNA polymerases alpha and delta.
  • Analysis of codon usage for serine residues in conserved domains.
  • In vitro functional substitution assays of DNA polymerase delta for DNA polymerase alpha.

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Main Results:

  • Conserved nucleotides/amino acids in polymerase domains III and IV of DNA polymerase delta are absent in DNA polymerase alpha.
  • Codon usage for serine in conserved domains is less conservative in DNA polymerase alpha compared to delta.
  • DNA polymerase delta demonstrated the ability to substitute for DNA polymerase alpha function in vitro.

Conclusions:

  • The findings support the hypothesis that eukaryotic DNA polymerase alpha originated exogenously, possibly through symbiotic events.
  • DNA polymerase alpha may be undergoing degeneration and exclusion from the eukaryotic DNA replication system.