J Bacteriol Virol.  2006 Jun;36(2):79-87. 10.4167/jbv.2006.36.2.79.

Genetic Variation in the NSP4 Gene of Human Rotavirus Isolated in Seoul

• Cho SL
• Ahn JH
• Kim K
• Chung SI
• Lim I
• Kim W

• KMID: 2055014
• DOI: http://doi.org/10.4167/jbv.2006.36.2.79

Abstract

The nonstructural protein 4 (NSP4) of rotavirus encoded by gene 10, plays an important role in rotavirus pathogenicity. In this study, NSP4 gene sequences of human rotaviruses circulating in Seoul, Korea between March 2004 and April 2005 were determined. The nucleotide sequence data indicated that the NSP4 genes of human rotavirus Korean isolates were 750 or 751 bases in length and encoded one open reading frame of 175 amino acids with two glycosylation sites. The NSP4 of Korean isolates exhibited amino acid sequence homologies between 59.4% and 98.9%. The NSP4 of CAU4 and CAU15 showed a high degree of amino acid sequence homologies with NSP4 genotype A viruses, but the NSP4 of CAU5, CAU6, CAU11, CAU14, CAU16 and CAU22 exhibited a high degree of amino acid sequence homologies with NSP4 genotype B viruses. Interestingly, CAU3 and CAU7 showed low degree of amino acid sequence homology with those of currently described NSP4 genotypes A to D and belonged a distinct lineage on the phylogenetic tree. These findings suggests that distinct NSP4 type was circulating among human rotavirus strains in the local community of Seoul and raising intriguing questions regarding possible explanations for new genotype.

Keyword

Rotavirus; NSP4; Genetic diversity

MeSH Terms

Amino Acid Sequence
Amino Acids
Base Sequence
Genetic Variation*
Genotype
Glycosylation
Herpesvirus 1, Cercopithecine
Humans*
Korea
Open Reading Frames
Rotavirus*
Seoul*
Sequence Homology, Amino Acid
Virulence
Amino Acids

Figure

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  Figure 1. Comparison of the deduced amino acid sequences of the NSP4 gene of rotavirus Korean isolates and representative foreign rotaviruses. The hydrophobic domains are indicated as H1, H2, H3. The NSP4 amino acid sequences of foreign rotaviruses were obtained from GenBank database.

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  Figure 2. Neighbour-joining tree based on NSP4 gene of rotavirus Korean isolates and representative foreign rotaviruses. The numbers at the nodes indicate the level of bootstrap support based on a neighbour-joining analysis of 1,000 resampled datasets; only values above 50% are given. The scale bar indicates 0.1 substitutions per nucleotide position.

Reference

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