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伪狂犬病病毒gD基因的生物信息学分析
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摘要
从2004.6-2005.6年四川省内各规模化大型猪场出现的流产死胎14头中,通过PCR检测出2头为阳性,并从中成功的分离到两株伪狂犬病病毒株,将其分别命名为SS株和SQ株。将所有的毒株连同四川农业大学动物生物技术中心保存Fa株、疫苗株783株、Bartha株和SA215株,四川野毒株SN株、SL株和SCZ株,以及由韶关学院英东生物工程学院娄高明教授惠赠的北京株BJ株、广东株DG、湖北株HS株共计12株伪狂犬病病毒株,应用PCR技术扩增得到了PRV完整的gD基因的片段12条。回收PCR产物,成功连接转化到感受态细胞E.coli DH_(5a)中,并通过菌落PCR和酶切鉴定正确后测序。
     将所的12条序列连同GenBank中登录的9条gD基因全序列共21条基因序列,使用生物软件对它们的基因序列的同源性、突变区域的定位、遗传进化关系、酶切位点的差异、密码子偏爱性,氨基酸序列的同源性、蛋白质亲水性、抗原表位分析、二级结构、三级结构预测等生物信息学的内容进行预测和分析。结果表明:PRV-gD基因的开放阅读框的核苷酸长度在1197~1215nt之间,氨基酸长度在399~405个之间,核酸同源性在97.3%-100%之间,氨基酸的同源性在89.8%-98.8%之间,在核酸820-837位有个高变重复区,不同毒株基因均对GC极为偏爱。在遗传进化关系上将我国PRV流行分为四川、华北、东南三个区域。毒株间基因内酶切位点、蛋白质亲水性、抗原表位和蛋白质高级结构预测等内容的分析结果十分相似,说明PRV-gD基因具有很高的保守性。该研究从病原、分子水平、生物信息等方面对PRV-gD基因进行了研究,对于PRV的流行病学研究及诊断和防治具有重要意义。
Two pig's abortus was resulted of pseudorabies virus by gD-PCR detected in 14 pig's abortus which were picked up from several large-scale hogpen in Sichuan province between 2004. 6-2005. 6. And then we Isolated two pseudorabies virus strain from these two pig's abortus successfully.They are named SS and SQ according to where they were picked up.There are 12 pseudorabies virus strain ,SS、SQ and Fa (saved by Sichuan Agriculture University Animal biotechnology center) and SA215 、783strain 、 Bartha(purchased from China Animal Husbandry Industry CO.LTD)and SN、 SL、 SCZ(Isolated by Xu Zhiwen associate professor in Sichuan Agriculture University Animal biotechnology center inl998) and BJ、DG、HS (gived by Lou Gaoming professor in Shaoguan University College of Yingdong Biorngineering) . Designing a pair of primer according to PRV gD gene, we received 12 gD complete gene by PCR.We used TaKaRa' s kit to retrieve gel and to ligate, transform into E. coli DH5a, and picking singal white masculine masculine by Amp-X-gal-IPTG LB flat plate. After identified by COL-PCR and RE, they were sequenced .
    We sequenced 12 PRV-gD gene and downloaded 9 gD's sequence , and then predict and analyzed their's Homology of nucleotide and amino acids sequence 、lacated mutation area、phylogentic tree、Enzymatic digestion site、 code preference、Hydrophobicity、 Predicting Antigenic helices and Three-dimensional structure by biology software.The result is : PRV-gD's ORF's length is between 1197-1215nt, amino acids' length is between 399~405; Homology of nucleotide sequence is between 97.3%~100%, Homology of amino acids sequence is between 89.8%~98.8%;PRV's code pref GC very much; phylogentic tree analusis result is make three district where PRV spreaded in Chian: Sichuan Province 、Northern Chinaan and Southeast China; and other result is very similar. All above is demonstrate; document;evid.;evidence;justify;proof;testify; verification;witness marks PRV-gD is very important to PRV and it has a heightly conservatism..
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