MBE Advance Access published online on September 8, 2005
Molecular Biology and Evolution, doi:10.1093/molbev/msj010
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1 Plymouth Marine Laboratory, Prospect Place, The Hoe, Plymouth, PL1 3DH, UK
* To whom correspondence should be addressed. We recently determined the genome sequence of the Coccolithoviridae strain EhV-86, a giant dsDNA algal virus from the family Phycodnaviridae that infects the marine coccolithophorid Emiliania huxleyi. Here, we determine the phylogenetic relationship between EhV-86 and other large dsDNA viruses. Twenty-five core genes common to nuclear-cytoplasmic large DNA virus (NCLDV) genomes were identified in the EhV-86 genome, sequence from eight of these genes were used to create a phylogenetic tree in which EhV-86 was placed firmly with the two other members of the Phycodnaviridae. We have also identified a 100kb region of the EhV-86 genome which appears to have transferred into this genome from an unknown source. Furthermore, the presence of six RNA polymerase subunits (unique among the Phycodnaviridae) suggests both a unique evolutionary history and a unique life style for this intriguing virus.
Accepted August 30, 2005
Research Article
Evolutionary History of the Coccolithoviridae
2 Marine Biological Association, Citadel Hill, Plymouth, PL1 2PB, UK
3 The Wellcome Trust Sanger Institute, Hinxton, Cambridge, CB10 1SA, UK
William H. Wilson, E-mail: whw{at}pml.ac.uk
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