title: High nucleotide substitution error frequencies in clonal pools of vesicular stomatitis virus.
abstract: Nucleotide substitution error frequencies were determined for several specific guanine base positions in the genomes of cloned vesicular stomatitis virus populations. Predetermined sites were examined in coding regions for the N, M, and L proteins and at a site in the genome 5'-end regulatory region. Misincorporation frequencies were estimated to be on the order of 10(-3) to 10(-4) at all positions analyzed. Isolates taken from virus populations after disruption of equilibrium conditions displayed replicase fidelity similar to that of cloned wild-type vesicular stomatitis virus. These mutation frequencies apply to all virus genomes present, including viruses rendered nonviable by lethal mutations. At one selected site in the N gene, two of three G----N base substitutions generated lethal nonsense mutations, yet their frequency was also very high. Biological implications for rapid virus evolution are discussed.
authors.affiliation: Department of Biology, University of California San Diego, La Jolla 92093.
authors.forename: D A
authors.initials: DA
authors.lastname: Steinhauer
authors.forename: J C
authors.initials: JC
authors.lastname: de la Torre
authors.forename: J J
authors.initials: JJ
authors.lastname: Holland
mesh_terms: D000818:Animals; D001483:Base Sequence; D005075:Biological Evolution; D002460:Cell Line; D006224:Cricetinae; D012321:DNA-Directed RNA Polymerases / Q000378:metabolism*; D005814:Genes, Viral; D009154:Mutation; D009710:Nucleotide Mapping; D014721:Vesicular stomatitis Indiana virus / Q000235:genetics*
chemical_list: D012321:DNA-Directed RNA Polymerases