Phylogenetic Analysis of Novel G12 Rotaviruses in the United States: A Molecular Search for the Origin of a New Strain

被引:31
作者
Freeman, M. M. [1 ]
Kerin, T. [1 ]
Hull, J. [1 ]
Teel, E. [1 ]
Esona, M. [1 ]
Parashar, U. [2 ]
Glass, R. I. [3 ]
Gentsch, J. R. [1 ]
机构
[1] Ctr Dis Control & Prevent, Gastroenteritis & Resp Viruses Lab Branch, Atlanta, GA USA
[2] Ctr Dis Control & Prevent, Epidemiol Branch, Atlanta, GA USA
[3] NIH, Fogarty Int Ctr, Bethesda, MD 20892 USA
关键词
rotavirus; classification; evolution; genetic shift; vaccine; GROUP-A ROTAVIRUSES; GENETIC-HETEROGENEITY; VP6; GENES; CHILDREN; EMERGENCE; DIARRHEA; IDENTIFICATION; EPIDEMIOLOGY; GENOTYPE; SPECIFICITY;
D O I
10.1002/jmv.21446
中图分类号
Q93 [微生物学];
学科分类号
071005 ; 100705 ;
摘要
Rotavirus serotype G12 was initially identified in the Philippines in 1987 and was not described again until it reemerged more than 13 years later. G12 strains were first detected in the United States in 2002 and have recently assumed a worldwide distribution. The high similarity between the sequence of the major outer capsid VP7 gene of human G12 strains and the single porcine G12 isolate raised the prospect that human strains may have arisen through reassortment with porcine strains or, alternatively, that the porcine strain originally came from humans. We sequenced portions of the remaining 10 segments of two human G12 strains (G12P[8] and G12P[61]) and a currently circulating common strain (GlP[8]) identified during the 2005-2006 surveillance season and compared the sequences with those of strains available through GenBank. By comparison, the three strains were all Wa-like and not porcine-like. A newly outlined classification system proposed genotypes for each gene segment based on nucleotide similarity. Using this approach, gene segments VP1-3, VP6 and NSP1-5 grouped within the same genotype, indicating that the three strains analyzed were closely related. These results suggest that the novel G12P[8] strain could have been formed by the solitary introduction of a VP7 gene into a globally common rotavirus strain, GlP[8]. Classifying rotavirus strains based only on VP7 (G) and VP4 (P) genotype potentially underestimates diversity and sequence analysis of the other segments is required to assess the complete genetic relationships between strains. J. Med. Virol. 81:736-746, 2009. (C) 2009 Wiley-Liss, Inc.
引用
收藏
页码:736 / 746
页数:11
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