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The contribution of epistasis to the architecture of fitness in an RNA virus

AuthorsSanjuán, Rafael ; Moya-Simarro, Andrés; Elena, Santiago F.
Evolutionary biology
Interactions among genome components
RNA viruses
Issue Date18-Oct-2004
PublisherNational Academy of Sciences (U.S.)
CitationProc. Natl. Acad. Sci. USA 101(43): 15376-15379 (2004)
AbstractThe tendency for genetic architectures to exhibit epistasis among mutations plays a central role in the modern synthesis of evolutionary biology and in theoretical descriptions of many evolutionary processes. Nevertheless, few studies unquestionably show whether, and how, mutations typically interact. Beneficial mutations are especially difficult to identify because of their scarcity. Consequently, epistasis among pairs of this important class of mutations has, to our knowledge, never before been explored. Interactions among genome components should be of special relevance in compacted genomes such as those of RNA viruses. To tackle these issues, we first generated 47 genotypes of vesicular stomatitis virus carrying pairs of nucleotide substitution mutations whose separated and combined deleterious effects on fitness were determined. Several pairs exhibited significant interactions for fitness, including antagonistic and synergistic epistasis. Synthetic lethals represented 50% of the latter. In a second set of experiments, 15 genotypes carrying pairs of beneficial mutations were also created. In this case, all significant interactions were antagonistic. Our results show that the architecture of the fitness depends on complex interactions among genome components.
Description4 pages, 2 figures.-- PMID: 15492220 [PubMed].-- PMCID: PMC524436.-- Additional information (Suppl. table S1: Relevant information about each single- and double-nucleotide substitution mutant created) available at: http://www.pnas.org/content/101/43/15376/suppl/DC1
Publisher version (URL)http://dx.doi.org/10.1073/pnas.0404125101
Appears in Collections:(IBMCP) Artículos
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