title: Exponential increases of RNA virus fitness during large population transmissions.
abstract: The great adaptability shown by RNA viruses is a consequence of their high mutation rates. Here we investigate the kinetics of virus fitness gains during repeated transfers of large virus populations in cell culture. Results always show that fitness increases exponentially. Low fitness clones exhibit regular increases observed as biphasic periods of exponential evolutionary improvement, while neutral clones show monophasic kinetics. These results are significant for RNA virus epidemiology, optimal handling of attenuated live virus vaccines, and routine laboratory procedures.
authors.affiliation: Department of Biology, University of California at San Diego, La Jolla 92093-0116, USA.
authors.forename: I S
authors.initials: IS
authors.lastname: Novella
authors.forename: E A
authors.initials: EA
authors.lastname: Duarte
authors.forename: S F
authors.initials: SF
authors.lastname: Elena
authors.forename: A
authors.initials: A
authors.lastname: Moya
authors.forename: E
authors.initials: E
authors.lastname: Domingo
authors.forename: J J
authors.initials: JJ
authors.lastname: Holland
mesh_terms: D000818:Animals; D005075:Biological Evolution; D002460:Cell Line; D006224:Cricetinae; D005819:Genetic Markers; D006367:HeLa Cells; D006801:Humans; D007700:Kinetics; D012328:RNA Viruses / Q000235:genetics* / Q000472:pathogenicity; D014721:Vesicular stomatitis Indiana virus / Q000235:genetics* / Q000254:growth & development; D014777:Virus Diseases / Q000453:epidemiology / Q000635:transmission*
chemical_list: D005819:Genetic Markers