Bacteriophages: Evolution of the majority

被引:310
作者
Hendrix, RW [1 ]
机构
[1] Univ Pittsburgh, Pittsburgh Bacteriophage Inst, Pittsburgh, PA 15260 USA
[2] Univ Pittsburgh, Dept Biol Sci, Pittsburgh, PA 15260 USA
关键词
bacteriophage; virus evolution; virus genomics;
D O I
10.1006/tpbi.2002.1590
中图分类号
Q14 [生态学(生物生态学)];
学科分类号
071012 ; 0713 ;
摘要
The dsDNA-tailed bacteriophages are probably the largest evolving group in the Biosphere and they are arguably very ancient. Comparative examination of genomes indicates that the hallmark of phage evolution is horizontal exchange of sequences. This is accomplished, first, by rampant non-homologous recombination between different genomes and, second, by reassortment of the variant sequences so created through homologous recombination. The comparative analysis suggests mechanisms by which new genes can be added to phage genomes and by which genes with novel functions may be assembled from parts. Horizontal exchange of sequences occurs most frequently among closely related phages, but it also extends across the entire global population at lower frequency. Bacteriophages also have probable ancestral connections with viruses of eukaryotes and archaea. (C) 2002 Elsevier Science (USA).
引用
收藏
页码:471 / 480
页数:10
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