title: Predominance of porcine rotavirus G9 in Japanese piglets with diarrhea: close relationship of their VP7 genes with those of recent human G9 strains.
abstract: Type G9 of group A rotavirus (GAR) was shown to be predominant in a survey of VP7 (G) and VP4 (P) genotypes among porcine GARs associated with outbreaks of diarrhea in young pigs in Japan between 2000 and 2002. Comparison of the G9 VP7 gene sequences showed that the porcine G9 strains were more closely related to human G9 strains reemerging globally since the mid-1990s than to those from the mid-1980s. The VP7 gene sequences of porcine G9 strains from different farms were divergent (6.1 to 7.2% difference in nucleotides), suggesting that these G9 VP7 genes were not the result of recent introduction into the porcine population. Regarding the P genotype specificities of porcine G9 strains, while the majority of strains were close to unusual porcine P types (P[13] and P[23]), two strains were of the P[6] type, which has closer sequence identity with the human AU19 strain than with the porcine Gottfried strain. These unexpected results suggest that G9 GARs in the porcine population have spread more widely than previously thought and that the VP7 genes of porcine G9 strains and those of some human G9 strains detected recently may have a common progenitor.
authors.affiliation: Shichinohe Research Unit, National Institute of Animal Health, Shichinohe, Aomori 0392586, Japan.
authors.forename: Tamara A
authors.initials: TA
authors.lastname: Teodoroff
authors.forename: Hiroshi
authors.initials: H
authors.lastname: Tsunemitsu
authors.forename: Kiyotora
authors.initials: K
authors.lastname: Okamoto
authors.forename: Ken
authors.initials: K
authors.lastname: Katsuda
authors.forename: Mariko
authors.initials: M
authors.lastname: Kohmoto
authors.forename: Kenji
authors.initials: K
authors.lastname: Kawashima
authors.forename: Toyoko
authors.initials: T
authors.lastname: Nakagomi
authors.forename: Osamu
authors.initials: O
authors.lastname: Nakagomi
mesh_terms: D000595:Amino Acid Sequence; D000818:Animals; D000956:Antigens, Viral / Q000737:chemistry / Q000235:genetics*; D001483:Base Sequence; D036022:Capsid Proteins / Q000737:chemistry / Q000235:genetics*; D003967:Diarrhea / Q000662:veterinary* / Q000821:virology; D006801:Humans; D008969:Molecular Sequence Data; D016601:RNA-Binding Proteins / Q000737:chemistry / Q000235:genetics; D012401:Rotavirus / Q000145:classification* / Q000235:genetics; D012400:Rotavirus Infections / Q000662:veterinary* / Q000821:virology; D013552:Swine; D013553:Swine Diseases / Q000821:virology*; D017361:Viral Nonstructural Proteins / Q000737:chemistry / Q000235:genetics
chemical_list: D000956:Antigens, Viral; D036022:Capsid Proteins; D016601:RNA-Binding Proteins; C050779:VP7 protein, Rotavirus; D017361:Viral Nonstructural Proteins; C079234:NS35 protein, rotavirus