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Journal of Zhejiang University SCIENCE B

ISSN 1673-1581(Print), 1862-1783(Online), Monthly

Full genome analysis of swine genotype 3 hepatitis E virus isolated from eastern China

Abstract: Hepatitis E is believed to occur in both endemic and sporadic forms in developing countries, which causes a major public health problem in Asia and Africa (Meng, 2010; Wang et al., 2016a). Recent studies have documented that the disease is also endemic in many industrialized countries (Wenzel et al., 2011). The causative agent, hepatitis E virus (HEV), belonging to the genus Orthohepevirus, is a non-enveloped RNA virus with a single-stranded, positive-sense genome of approximately 7.2 kb (Smith et al., 2014). The genome consists of a short 5' un-translated region (UTR), three open reading frames (ORFs), and a 3' UTR containing a poly(A) tail (Meng, 2011). Four recognized major genotypes of HEV are identified: genotype 1 (Asian and African strains), genotype 2 (a Mexican strain), genotype 3 (primarily from America and Europe, and some Asian countries), and genotype 4 (mainly Asian strains) (Smith et al., 2016). Previous study revealed that HEV genotype 4 is the dominant zoonotic HEV genotype in China (Wang et al., 2016a). However, infections with HEV 3 have been found more commonly in recent years in China (Liu et al., 2012; Zhang et al., 2013). To date, only one full genome of Chinese swine genotype 3 HEV strain from Shanghai has been documented (Si et al., 2009). We report here the first full genome sequence of a genotype 3 swine HEV strain from Zhejiang, China.

Key words: Swine hepatitis E virus; Full genome sequence; Phylogenetic analysis; Genotype 3

Chinese Summary  <19> åŸºå› 3型猪戊型è‚炎病毒浙江株全基因组åºåˆ—分æž

目的:扩增浙江地区基因3型戊型è‚炎病毒全基因组åºåˆ—,分æžå…¶åˆ†å­ç‰¹å¾åŠä¸Žå›½å†…外3型戊型è‚炎病毒进行比较。
创新点:首次分æžæŠ¥é“浙江地区基因3型猪戊型è‚炎病毒全åºåˆ—。
方法:利用套å¼PCR和末端快速扩增法对分离自浙江地区的戊型è‚炎病毒进行分段扩增,ç»å…‹éš†æµ‹åºåŽæ‹¼æŽ¥å…¨åŸºå› ç»„。进一步利用生物信æ¯å­¦æ–¹æ³•å¯¹åŸºå› ç»„结构ã€å¼€æ”¾é˜…读框åŠå…¶åŸºå› åž‹ç­‰è¿›è¡Œåˆ†æžï¼Œå¹¶ä¸Žå›½å†…外戊型è‚炎毒株进行比较分æžã€‚
结论:浙江株戊型è‚炎病毒(ZhJ-PJ050-3)基因组由7223个核苷酸组æˆï¼Œå…¶ä¸­3’éžç¼–ç åŒºå«æœ‰23个碱基的poly(A)尾。全基因组包å«ORF1ã€ORF2å’ŒORF3三个主è¦åŸºå› ï¼Œé•¿åº¦åˆ†åˆ«ä¸º5109ã€1983å’Œ342 bp。进化分æžæ˜¾ç¤ºï¼ŒZhJ-PJ050-3为基因3型,与国内唯一报é“的上海株3型毒株以åŠå¤šæ•°æ—¥æœ¬æ¯’株共属3b亚型。与国内外戊型è‚ç‚Žåºåˆ—比对å‘现,ZhJ-PJ050-3基因组共有24个特有的点çªå˜ï¼Œä¸”在ORF1中å«æœ‰ä¸€ä¸ªäº®æ°¨é…¸ç¼ºå¤±ã€‚这些分å­ç‰¹å¾å°†ä¸ºä¸‹ä¸€æ­¥çš„研究æ供方å‘。

关键è¯ç»„:猪戊型è‚炎病毒;全基因组åºåˆ—;进化分æžï¼›åŸºå› 3åž‹


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DOI:

10.1631/jzus.B1600419

CLC number:

S852.65

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On-line Access:

2017-06-05

Received:

2016-09-22

Revision Accepted:

2016-12-16

Crosschecked:

2017-05-10

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