Author: Tromas, Nicolas; Zwart, Mark P.; Forment, Javier; Elena, Santiago F.
Title: Shrinkage of Genome Size in a Plant RNA Virus upon Transfer of an Essential Viral Gene into the Host Genome Document date: 2014_2_20
ID: 5fejitls_39
Snippet: We conclude that the evolution of TEV and TEV-ÃNIb in N. tabacum 35S::NIb was similar when transmission bottlenecks are close in time. Although there was a significant lineage-dependent effect on accumulation, only one evolved lineage of TEV-ÃNIb had a significantly lower accumulation than its ancestral virus. Moreover, patterns of molecular evolution were similar. There were no significant differences in the ratios of transitions to transversi.....
Document: We conclude that the evolution of TEV and TEV-ÃNIb in N. tabacum 35S::NIb was similar when transmission bottlenecks are close in time. Although there was a significant lineage-dependent effect on accumulation, only one evolved lineage of TEV-ÃNIb had a significantly lower accumulation than its ancestral virus. Moreover, patterns of molecular evolution were similar. There were no significant differences in the ratios of transitions to transversions, synonymous to nonsynonymous mutations, and the overall distribution of mutations. The one mutation that occurred in multiple lineages, A6805G, occurred in both lineages of TEV and TEV-ÃNIb. Therefore, the only conspicuous difference between the two viruses is mutations localized in the 6K1/CI junction.
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