该研究旨在建立快速、敏感和特异的检测类猪圆环病毒因子P1的SYBR Green Ⅰ荧光定量PCR法,用于P1的早期诊断。以感染P1的猪血清DNA提取物为模板,采用PCR扩增P1 101 bp的基因片段,将其克隆至pMD18-T载体,重组质粒测序并进行同源性分析;...该研究旨在建立快速、敏感和特异的检测类猪圆环病毒因子P1的SYBR Green Ⅰ荧光定量PCR法,用于P1的早期诊断。以感染P1的猪血清DNA提取物为模板,采用PCR扩增P1 101 bp的基因片段,将其克隆至pMD18-T载体,重组质粒测序并进行同源性分析;以阳性质粒为模板,建立SYBR Green Ⅰ荧光定量PCR检测方法,并进行敏感性和特异性检测。经测序证实扩增片段属于P1,所建立的SYBR Green Ⅰ荧光定量PCR检测P1的反应在101-108拷贝/μL之间具有良好的线性关系,反应的检出下限为10拷贝/μL,而对猪伪狂犬病病毒、猪细小病毒、猪繁殖与呼吸综合征病毒等的检测为阴性,表明该方法敏感、特异。成功建立了SYBR Green Ⅰ荧光定量PCR检测P1载量的方法,为P1致病机制和机体免疫保护机制的研究提供了技术平台。展开更多
[Objective] In this study, the quantitive detection of PCV2 （porcine circovirus type 2） in vitro was achieved. We aimed to establish two kinds of TaqMan real-time PCR methods based on PCV20RF1 and ORF2 respectively ...[Objective] In this study, the quantitive detection of PCV2 （porcine circovirus type 2） in vitro was achieved. We aimed to establish two kinds of TaqMan real-time PCR methods based on PCV20RF1 and ORF2 respectively and compare them. [Method] According to the relatively＇conserved sequences of PCV20RF1 and ORF2 registered in GenBank, two pairs of specific primers and TaqMan probes were designed and synthesized. Then the recombinant plasmids containing the whole sequences of PCV20RF1 and ORF2 were constructed to draw the standard curves through optimizing the reaction system and conditions. And thus two kinds of TaqMan real-time PCR detection methods based on the whole sequences of ORF1 and ORF2 respectively were constructed for PCV2. [Result] For the two established standard curves, the Ct values showed a good linear relationship with the loga- rithms of copy numbers of templates （F2〉0.99）. The amplification efficiency ranged from 90% to 110%. The amplifications all had a good repeatability with variation coefficients within groups all less than 5%. Moreover, the amplifications all had a good specificity. When the sequences of porcine parvovirus （PPV）, porcine circovirus type 1 （PCV1）, swine pseudorabies virus （PRV）, porcine reproductive and respiratory syndrome virus （PRRSV） were used as templates, the target sequence was not amplified. The amplifications also had a high sensitivity. The ORF1 detection method could reach 1.0x10T copies/;ul, and the ORF2 detection method could reach 1.0×10^2 copies/μl. The two established real-time PCR detection methods were used to detect the 80 clinical samples respectively. The results showed the magnitudes of 72 amplified samples were basically consistent between the 2 detection methods, while the magnitudes of the other 8 amplified samples were inconsistent. Then the 8 samples were detected with SYBR Green I real-time PCR method established based on the sequence of PCV2-1ike factor P1 by Wen et aL The PCV2-1ike factor P1 was amplified in all the 8 samples, indicating the 8 samples were all infected with PCV2-1ike factor P1. [Conclusion] The ORFl-based detection method has a higher accuracy, and it can be used for the rapid detection of PCV2.展开更多
文摘该研究旨在建立快速、敏感和特异的检测类猪圆环病毒因子P1的SYBR Green Ⅰ荧光定量PCR法,用于P1的早期诊断。以感染P1的猪血清DNA提取物为模板,采用PCR扩增P1 101 bp的基因片段,将其克隆至pMD18-T载体,重组质粒测序并进行同源性分析;以阳性质粒为模板,建立SYBR Green Ⅰ荧光定量PCR检测方法,并进行敏感性和特异性检测。经测序证实扩增片段属于P1,所建立的SYBR Green Ⅰ荧光定量PCR检测P1的反应在101-108拷贝/μL之间具有良好的线性关系,反应的检出下限为10拷贝/μL,而对猪伪狂犬病病毒、猪细小病毒、猪繁殖与呼吸综合征病毒等的检测为阴性,表明该方法敏感、特异。成功建立了SYBR Green Ⅰ荧光定量PCR检测P1载量的方法,为P1致病机制和机体免疫保护机制的研究提供了技术平台。
基金Supported by National Natural Science Foundation of China(31302071)Special Fund for Agro-scientific Research in the Public Interest(201303046)+1 种基金Jiangsu Agricultural Science and Technology Innovation Fund(CX(14)2045)"333 High-level Personnel Training Project"of Jiangsu Province(BRA2012194)~~
文摘[Objective] In this study, the quantitive detection of PCV2 （porcine circovirus type 2） in vitro was achieved. We aimed to establish two kinds of TaqMan real-time PCR methods based on PCV20RF1 and ORF2 respectively and compare them. [Method] According to the relatively＇conserved sequences of PCV20RF1 and ORF2 registered in GenBank, two pairs of specific primers and TaqMan probes were designed and synthesized. Then the recombinant plasmids containing the whole sequences of PCV20RF1 and ORF2 were constructed to draw the standard curves through optimizing the reaction system and conditions. And thus two kinds of TaqMan real-time PCR detection methods based on the whole sequences of ORF1 and ORF2 respectively were constructed for PCV2. [Result] For the two established standard curves, the Ct values showed a good linear relationship with the loga- rithms of copy numbers of templates （F2〉0.99）. The amplification efficiency ranged from 90% to 110%. The amplifications all had a good repeatability with variation coefficients within groups all less than 5%. Moreover, the amplifications all had a good specificity. When the sequences of porcine parvovirus （PPV）, porcine circovirus type 1 （PCV1）, swine pseudorabies virus （PRV）, porcine reproductive and respiratory syndrome virus （PRRSV） were used as templates, the target sequence was not amplified. The amplifications also had a high sensitivity. The ORF1 detection method could reach 1.0x10T copies/;ul, and the ORF2 detection method could reach 1.0×10^2 copies/μl. The two established real-time PCR detection methods were used to detect the 80 clinical samples respectively. The results showed the magnitudes of 72 amplified samples were basically consistent between the 2 detection methods, while the magnitudes of the other 8 amplified samples were inconsistent. Then the 8 samples were detected with SYBR Green I real-time PCR method established based on the sequence of PCV2-1ike factor P1 by Wen et aL The PCV2-1ike factor P1 was amplified in all the 8 samples, indicating the 8 samples were all infected with PCV2-1ike factor P1. [Conclusion] The ORFl-based detection method has a higher accuracy, and it can be used for the rapid detection of PCV2.
