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Evolution of T4-related phages
E Kutter1, K Gachechiladze, A Poglazov
1Evergreen State College, Olympia, WA 98505, USA. t4phage@elwha.evergreen.edu
Virus Genes
|January 1, 1995
Summary
Comparative genomics reveals T-even phage evolution, highlighting gene origins and horizontal gene transfer. Analysis of T4 phage and related genomes shows significant genomic variation and complex evolutionary relationships.
Area of Science:
- Microbiology
- Molecular Biology
- Evolutionary Biology
Background:
- T-even phage biology has seen significant advancements over 50 years.
- The T4 phage genome comprises nearly 300 genes, with functions for many still unknown.
- The evolutionary origins of most T4 phage genes remain unclear.
Purpose of the Study:
- To investigate the evolutionary origins and interrelationships of T-even phage genes.
- To understand the functions of T-even phage protein products through comparative genomics.
- To explore the impact of horizontal gene transfer on T-even phage evolution.
Main Methods:
- Comparative genomic analysis of T-even phages from diverse geographical locations.
- Sequence comparison of T4 phage genes against GenBank.
- Identification of gene duplications and homologous sequences in related phages.
Main Results:
- T-even phage genomes exhibit basic similarity but contain substantial insertions and deletions.
- Few instances of evolution via DNA duplication were identified in T4-related phages.
- Horizontal gene transfer is a significant factor in the evolution of T-even phage tail-fiber regions.
Conclusions:
- Comparative genomics is crucial for deciphering T-even phage gene functions and evolutionary history.
- Horizontal gene transfer, likely involving site-specific recombination, plays a key role in shaping T-even phage genomes, particularly tail-fiber genes.
- Further research is needed to elucidate the functions of uncharacterized T-even phage genes.