为建立H3亚型犬流感病毒(CIV)荧光定量PCR检测方法,本研究根据H3亚型CIV HA基因的保守区序列,设计合成一对特异性引物和Taq Man MGB探针,经条件优化后初步建立了H3亚型CIV荧光定量RT-PCR检测方法。结果显示,构建的重组质粒标准品在109拷...为建立H3亚型犬流感病毒(CIV)荧光定量PCR检测方法,本研究根据H3亚型CIV HA基因的保守区序列,设计合成一对特异性引物和Taq Man MGB探针,经条件优化后初步建立了H3亚型CIV荧光定量RT-PCR检测方法。结果显示,构建的重组质粒标准品在109拷贝/μL~10^(2)拷贝/μL浓度范围内有良好的线性关系,标准曲线的相关系数为0.999。该方法仅能特异性扩增H3N2亚型CIV核酸,与H3N2亚型禽流感病毒、人流感病毒和猪流感病毒及H9N2亚型CIV、H1N1亚型猪流感病毒、犬腺病毒、犬瘟热病毒、犬细小病毒、犬冠状病毒等病毒核酸均无交叉反应。该方法最低可检测到的质粒标准品浓度为19拷贝/μL,敏感性高于普通PCR方法。组内与组间重复性试验的变异系数均小于1%。利用该方法对83份临床样品的核酸进行检测,检测结果与病毒分离结果总符合率为97.59%。本研究建立的荧光定量PCR检测方法特异性强、敏感性高、重复性好、操作简便,为临床H3亚型CIV的快速检测提供可靠方法。展开更多
In recent years,the avian influenza has brought not only serious economic loss to the poultry industry in China but also a serious threat to human health because of the avian influenza virus(AIV) gene recombination an...In recent years,the avian influenza has brought not only serious economic loss to the poultry industry in China but also a serious threat to human health because of the avian influenza virus(AIV) gene recombination and reassortment.Until now,traditional RT-PCR,fluorescence RT-PCR and virus isolation identification have been developed and utilized to detect AIV,but these methods require high-level instruments and experimental conditions,not suitable for the rapid detection in field and farms.In order to develop a rapid,sensitive and practical method to detect and identify AIV subtypes,4 specific primers to the conserved region of AIV M gene were designed and a loop-mediated isothermal amplification(RT-LAMP) method was established.Using this method,the M gene of H1–H16 subtypes of AIV were amplified in 30 min with a water bath and all 16 H subtypes of AIV were able to be visually identified in presence of fluorescein,without cross reaction with other susceptible avian viruses.In addition,the detection limit of the common H1,H5,H7,and H9 AIV subtypes with the RT-LAMP method was 0.1 PFU(plaque-forming unit),which was 10 times more sensitive than that using the routine RT-PCR.Further comparative tests found that the positivity rate of RT-LAMP on detecting clinical samples was 4.18%(14/335) comparing with 3.58%(12/335) from real-time RT-PCR.All these results suggested that the RT-LAMP method can specifically detect and identify AIV with high sensitivity and can be considered as a fast,convenient and practical method for the clinic test and epidemiological investigation of AIV.展开更多
文摘为建立H3亚型犬流感病毒(CIV)荧光定量PCR检测方法,本研究根据H3亚型CIV HA基因的保守区序列,设计合成一对特异性引物和Taq Man MGB探针,经条件优化后初步建立了H3亚型CIV荧光定量RT-PCR检测方法。结果显示,构建的重组质粒标准品在109拷贝/μL~10^(2)拷贝/μL浓度范围内有良好的线性关系,标准曲线的相关系数为0.999。该方法仅能特异性扩增H3N2亚型CIV核酸,与H3N2亚型禽流感病毒、人流感病毒和猪流感病毒及H9N2亚型CIV、H1N1亚型猪流感病毒、犬腺病毒、犬瘟热病毒、犬细小病毒、犬冠状病毒等病毒核酸均无交叉反应。该方法最低可检测到的质粒标准品浓度为19拷贝/μL,敏感性高于普通PCR方法。组内与组间重复性试验的变异系数均小于1%。利用该方法对83份临床样品的核酸进行检测,检测结果与病毒分离结果总符合率为97.59%。本研究建立的荧光定量PCR检测方法特异性强、敏感性高、重复性好、操作简便,为临床H3亚型CIV的快速检测提供可靠方法。
基金supported by the Special Foundation for State Basic Research Program of China(2013FY113300-8)the National Key R&D Program of China(2016YFD0500800)
文摘In recent years,the avian influenza has brought not only serious economic loss to the poultry industry in China but also a serious threat to human health because of the avian influenza virus(AIV) gene recombination and reassortment.Until now,traditional RT-PCR,fluorescence RT-PCR and virus isolation identification have been developed and utilized to detect AIV,but these methods require high-level instruments and experimental conditions,not suitable for the rapid detection in field and farms.In order to develop a rapid,sensitive and practical method to detect and identify AIV subtypes,4 specific primers to the conserved region of AIV M gene were designed and a loop-mediated isothermal amplification(RT-LAMP) method was established.Using this method,the M gene of H1–H16 subtypes of AIV were amplified in 30 min with a water bath and all 16 H subtypes of AIV were able to be visually identified in presence of fluorescein,without cross reaction with other susceptible avian viruses.In addition,the detection limit of the common H1,H5,H7,and H9 AIV subtypes with the RT-LAMP method was 0.1 PFU(plaque-forming unit),which was 10 times more sensitive than that using the routine RT-PCR.Further comparative tests found that the positivity rate of RT-LAMP on detecting clinical samples was 4.18%(14/335) comparing with 3.58%(12/335) from real-time RT-PCR.All these results suggested that the RT-LAMP method can specifically detect and identify AIV with high sensitivity and can be considered as a fast,convenient and practical method for the clinic test and epidemiological investigation of AIV.
