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J. Virol. doi:10.1128/JVI.01390-06
Copyright (c) 2006, American Society for Microbiology and/or the Listed Authors/Institutions. All Rights Reserved.

Reassortment and concerted evolution in Banana bunchy top virus genomes

Institute of Ecology and Evolutionary Biology, National Taiwan University; Department of Plant Pathology and Microbiology, National Taiwan University, 1, sec 4, Roosevelt Road, Taipei 106, Taiwan

^* To whom correspondence should be addressed. Email: jmhu{at}ntu.edu.tw, hyeh{at}ntu.edu.tw.

	Abstract

The nanovirus Banana bunchy top virus (BBTV) has 6 standard components in its genome and occasionally contains components encoding additional Rep genes. Phylogenetic network analysis of coding sequences of DNA 1 and 3 confirmed the 2 major groups of BBTV, a Pacific and an Asian group, but show evidence of web-like phylogenies for some genes. Phylogenetic analysis of 102 major common regions (CR-M) from all 6 components showed a possible concerted evolution within the Pacific group, which is likely due to recombination in this region. The CR-M of additional Rep genes is close to that of DNA 1 and 2. Comparison of tree topologies constructed with DNA 1 and DNA 3 coding sequences of 14 BBTV isolates showed distinct phylogenetic histories based on Kishino-Hasegawa and Shimodaira-Hasegawa tests. The results of principal component analysis of amino acid and codon usages indicate that DNA 1 and 3 have a codon bias different from that of all other genes of nanoviruses, including all currently known additional Rep genes of BBTV, which suggests a possible ancient genome reassortment event between distinctive nanoviruses.

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