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Identification of group A rotavirus genes associated with virulence of a porcine rotavirus and host range restriction of a human rotavirus in the gnotobiotic piglet model.

Abstract：

:Rotaviruses are the leading cause of severe diarrhea in infants and young children worldwide. Thus, the development of an effective rotavirus vaccine is a major public health goal. This study was performed to identify the gene or genes responsible for rotavirus virulence or host range restriction and attenuation in a natural host. Such knowledge could have an important bearing on the selection of candidate live vaccine strains. We addressed this issue by analyzing the response of gnotobiotic piglets to orally administered porcine x human rotavirus reassortants. It was possible to determine (i) which porcine rotavirus genes were required for the induction of diarrhea, and (ii) which human rotavirus genes are associated with the host range restriction because the parental porcine rotavirus (SB-1A strain) caused diarrhea in piglets, whereas the parental human rotavirus (DS-1 strain) was attenuated in piglets. Substitution of the 3rd (VP3) or 4th (VP4) or 9th (VP7) or 10th (NS28 (NSP4)) gene of the avirulent human strain for the corresponding gene of porcine rotavirus that was virulent for gnotobiotic piglets yielded viral reassortants that failed to induce diarrhea. Further analysis indicated that reassortants which possessed only one, two, or three of these porcine rotavirus genes on a background of human rotavirus genes also failed to induce diarrhea. However, diarrhea was induced when all four of these porcine rotavirus genes were included in a reassortant in which the remaining seven genes were derived from the human rotavirus. These observations suggest that it may be possible to attenuate wild-type human rotavirus strains that are virulent for humans by selective genetic reassortment with an animal rotavirus strain that is attenuated for humans.

journal_name

Virology

journal_title

Virology

authors

Hoshino Y,Saif LJ,Kang SY,Sereno MM,Chen WK,Kapikian AZ

doi

10.1006/viro.1995.1255

subject

Has Abstract

pub_date

1995-05-10 00:00:00

pages

274-80

issue

1

eissn

0042-6822

issn

1096-0341

pii

S0042-6822(85)71255-X

journal_volume

209

pub_type

杂志文章

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