The difference for quantity of nucleotide and amino acid between human rotavirus strain \u2013 Vietnam candidate for rotavirus vaccine production and international standard wild strains

ABSTRACT

Background: Rotavirus induced diseases is most commonly seen in children between 6 and 36 months old. In developing countries, rotavirus is also a common cause of gastrointestinal inflammation in below 2 years old children. Study on production of vaccine strains is a target that the World Health Organization is providing. Objective: To determine the quantity of different nucleotide and amino acids of genes 4, 6, 9, 10 of the Vietnam seed lot system and vaccine G1P8, G1P4 and G4P6. Subject and methods: By sequence method determine the quantity of different nucleotide and amino acids of gene 4 (VP4), gene 6 (VP6), gene 9 (VP7) and gene 10 (NSP4) of the Vietnam seed lot system and vaccine G1P8 (KH0118), G1P4 (2001019210) and G4P6 (2001019203) in comparison with international standard wild strains such as Ku, DS1, ST3, Hochi, TB-chen. Results and Conclusion: Each strain had a different nucleotide and amino acid sequence and it was characterized by each country. However, these strains had the same general chemical components including nucleic acid and protein. Nucleic acid was a double fiber ARN with 11 genes, and 18 thousand base pairs. 3 proteins with specific antigens were VP4, VP6 and VP7. 57 nucleotide of gene 4 (VP4) of the seed lot system G1P8 were different with Ku (AB22772) strain but there were only 17 different amino acids. For gene 7 (VP7), 70 nucleotide were different between G1P8 strain and Ku (AB222784) strain but there were 15 different amino acids. For gene 6 (VP6), although 141 nucleotide were different between G1P8 strain and Ku (AB222784) strain but there were only 9 different amino acids. For gene 10 (NSP4), 62 nucleotide were different between G1P8 strain and Ku strain (AB222772), making 12 different amino acids.