title: Comparative studies of A/Leningrad/134/57 wild-type and 47-times passaged cold-adapted mutant influenza viruses: oligonucleotide mapping and RNA-RNA hybridization studies.
abstract: Direct biochemical evidence for the existence of mutations in five of the RNA segments of the A/Leningrad/134/57 cold-adapted 47th passage mutant as compared with its wild-type progenitor has been obtained using two techniques. T1 oligonucleotide mapping of total viral RNA as well as of individual RNA segments revealed changes in RNAs 4, 5 and 6. Analysis of S1 nuclease-treated RNA-RNA hybrids on polyacrylamide gels revealed changes in at least one of the polymerase genes as well as in RNAs 4, 5, 6 and 7. These findings provide a direct demonstration for the existence of multiple mutations in the cold-adapted mutant vaccine strain.
authors.forename: N J
authors.initials: NJ
authors.lastname: Cox
authors.forename: A P
authors.initials: AP
authors.lastname: Kendal
authors.forename: A A
authors.initials: AA
authors.lastname: Shilov
authors.forename: G I
authors.initials: GI
authors.lastname: Alexandrova
authors.forename: Y Z
authors.initials: YZ
authors.lastname: Ghendon
authors.forename: A I
authors.initials: AI
authors.lastname: Klimov
mesh_terms: D003080:Cold Temperature; D004720:Endonucleases; D009980:Influenza A virus / Q000235:genetics*; D009154:Mutation; D009693:Nucleic Acid Hybridization; D009843:Oligoribonucleotides / Q000032:analysis; D012367:RNA, Viral / Q000235:genetics*; D006163:Ribonuclease T1; D015719:Single-Strand Specific DNA and RNA Endonucleases; D013045:Species Specificity
chemical_list: D009843:Oligoribonucleotides; D012367:RNA, Viral; D004720:Endonucleases; D006163:Ribonuclease T1; D015719:Single-Strand Specific DNA and RNA Endonucleases