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Evolution of viral DNA-dependent DNA polymerases
1Forschungsschwerpunkt Genomforschung und Bioinformatik, Deutsches Krebsforschungszentrum, Heidelberg, FRG. c.knopf@dkfz-heidelberg.de
Virus Genes
|May 1, 1998
Summary
Viral DNA polymerases (Pol) share conserved domains for replication. Phylogenetic analysis reveals protein-primed replication mechanisms in viral Pol are ancient, suggesting early origins in viral DNA synthesis.
Area of Science:
- Molecular Biology
- Virology
- Bioinformatics
Background:
- DNA viruses rely on DNA-dependent DNA polymerase (Pol) for replication.
- Viral Pol, belonging to families A and B, possess conserved 3'-5'-exonuclease domains (Exo I, II, III).
- Distinct polymerase domains and motif arrangements differentiate family A and B Pol.
Purpose of the Study:
- To investigate the evolutionary relationships of viral DNA polymerases.
- To determine the phylogenetic placement of different viral Pol families.
- To elucidate the evolutionary origins of viral DNA replication mechanisms.
Main Methods:
- Phylogenetic analysis using maximum parsimony and distance methods.
- Alignment of consensus sequences from diverse viral and archaeobacterial Pol.
- Bootstrap analysis for tree evaluation.
Main Results:
- Phylogenetic trees consistently grouped viral Pol into major branches.
- A distinct branch identified Pol utilizing a protein-primed DNA replication mechanism (e.g., adenoviruses, bacteriophages).
- Archaebacterial and cellular Pol epsilon formed the base of the protein-primed Pol branch.
Conclusions:
- Viral Pol with protein-priming mechanisms represent ancient lineages.
- Protein-primed DNA replication is suggested as an early mode of viral DNA synthesis.
- Phylogenetic analysis provides insights into the evolution of viral replication machinery.