Open AccessComplete nucleotide sequence of the attenuated poliovirus Sabin 1 strain genome.
Author(s) -
Akio Nomoto,
Toshiko Omata,
Haruka Toyoda,
Shusuke Kuge,
Hitoshi Horie,
Yutaka Kataoka,
Yuko Genba,
Yasuko Nakano,
Nobumasa Imura
Publication year - 1982
Publication title -
proceedings of the national academy of sciences of the united states of america
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 5.011
H-Index - 771
eISSN - 1091-6490
pISSN - 0027-8424
DOI - 10.1073/pnas.79.19.5793
Subject(s) - biology , nucleic acid sequence , capsid , genome , poliovirus , genetics , virology , peptide sequence , coding region , rna , nucleotide , complementary dna , sequence analysis , microbiology and biotechnology , dna , gene , virus
The complete nucleotide sequence of the genome of the type 1 poliovirus vaccine strain (LSc,2ab) was determined by using molecular cloning and rapid sequence analysis techniques. The restriction fragments of double-stranded cDNA synthesized from the vaccine strain RNA were inserted into the adequate sites of cloning vector pBR322. Sequence analysis of the cloned DNAs revealed that the virion RNA molecule was 7,441 nucleotides long and polyadenylylated at the 3' terminus. When the nucleotide sequence was compared with that of the genome of the virulent parental strain (Mahoney), 57 base substitutions were observed to be scattered all over the genome. Of these, 21 resulted in amino acid changes in a number of viral proteins. A cluster of amino acid changes is located in the viral coat proteins, especially in the NH2-terminal half of the viral capsid protein VP1. These results may imply that the mutations in the VP1 coding region contribute to attenuation.