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非洲猪瘟病毒p72蛋白间接ELISA抗体检测方法的建立

文献类型： 中文期刊

作者： 庚辛;孙明霞;王淑杰;汤艳东;高金源;蔡雪辉

作者机构：

关键词： 非洲猪瘟病毒; p72蛋白; ELISA

期刊名称：中国预防兽医学报

ISSN： 1008-0589

年卷期： 2021 年 43 卷 09 期

页码：

收录情况： 北大核心（2020版） ; CSCD（2020-2021年度） ; 农林核心（2020版） ; 科技核心（2020版）

摘要： 为建立非洲猪瘟病毒（ASFV）的血清学检测方法,本研究根据ASFV Georgia2007/1株基因组合成其p72全长基因,并将其克隆至p GEX6p-1载体,构建重组质粒pGEX6p-1-p72并经酶切、PCR和测序鉴定正确后转化BL21感受态细胞,经IPTG诱导表达后经SDS-PAGE和western blot鉴定,结果显示获得了可溶性表达且纯度较高的重组p72蛋白（rp72）。利用GST亲和纯化层析柱纯化,得到浓度为0.2 mg/mL的rp72。以rp72作为包被抗原,通过优化各反应条件建立检测猪血清中非洲猪瘟抗体的间接ELISA方法,结果显示,rp72最佳包被浓度为1.25μg/mL,封闭时间为37℃1 h;待检血清稀释度为1.100,孵育时间为37℃30 min;羊抗猪IgG-HRP孵育时间为37℃1 h。利用该方法检测280份阴性血清,确定其临界值为0.412。采用建立的间接ELISA抗体方法对PEDV、PRRSV、CSFV、PRV、TGEV、PPV、PCV、E. coli阳性猪血清进行检测,结果显示,除ASFV阳性对照为阳性外,其他病原阳性血清检测结果均为阴性,该方法特异性强;将非洲猪瘟抗体阳性猪血清2倍倍比稀释（1.100～1.6 400）后,利用该方法进行检测,结果显示其检测阳性血清的稀释度为1.3 200倍时OD450nm值仍大于临界值,敏感性高于市售西班牙ASFV阻断ELISA试剂盒检测结果,本研究建立的方法敏感性较高;对该方法进行批内和批间重复性试验,结果显示批内和批间的变异系数均<10%,重复性良好。利用本研究建立的ASFV ELISA抗体检测方法（p72）对184份临床血清进行检测,结果显示该方法敏感性为100%,特异性为98.70%;与ASFV阻断ELISA抗体检测试剂盒方法总符合率为98.91%,kappa值为0.961。本研究首次基于rp72建立的非洲猪瘟抗体间接ELISA检测方法具有良好的重复性、敏感性和特异性,为ASFV抗体检测提供了一种快速、精准、经济、高效的方法。

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