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Updated: Aug 24, 2025

Molecular Evolution of the Tre Recombinase
Published on: May 29, 2008
Evolution of cucurbit-infecting tobamoviruses: Recombination and codon usage bias
Mei He1, Cheng-Qiang He1, Nai-Zheng Ding1
1Dongying Institute, Shandong Normal University, Dongying 257000, China; College of Life Science, Shandong Normal University, Jinan 250014, China.
Abstract:
Currently, there are seven cucurbit-infecting tobamoviruses comprising cucumber green mottle mosaic virus (CGMMV), Kyuri green mottle mosaic virus (KGMMV), cucumber fruit mottle mosaic virus (CFMMV), zucchini green mottle mosaic virus (ZGMMV), cucumber mottle virus (CMoV), watermelon green mottle mosaic virus (WGMMV), and Trichosanthes mottle mosaic virus (TrMMV). To gain more insights into their evolution, recombination analyses were conducted. Four CGMMV isolates and one KGMMV isolate were suggested to be recombinants. And there was an interspecies recombination event between CGMMV and ZGMMV. Phylogenetic incongruence was also observed for CGMMV and KGMMV. A probable ancestral pattern was inferred for the gene junction region between RdRp and MP. Codon usage bias analysis revealed that the viral genes had additional influence independent of compositional constraint. In codon preference, the seven viruses were both similar to and different from the host cucumber (Cucumis sativus). Moreover, the viruses were not deficient in CpG and UpA dinucleotides.
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