摘要
[Objective] This study aimed to develop a quantitative competitive assay for detecting Mycoplasma hyopneumoniae in culture. [Method] One pair of Mhp-specific primers was designed for detecting Mhp in culture. Another pair of primers was designed based on the conserved gene sequences of Mycoplasma. The competitive template, which carried the same primer binding site with the target fragment, was constructed using enzyme digestion method. [Result] The logarithm of concentration of competitive template was treated as the abscissa（X-axis）, and the logarithm of corrected optical density ratio between amplification products by competitive template and target template was treated as the ordinate（Y-axis）. Thus the standard curve was drawn, and the regression equation was also obtained. When Y was assigned as 0, the concentration of the competitive plate was calculated, and then the concentration of Mhp was deduced. The logarithms of Color change unit（CCU） were treated as the abscissa（X-axis）, and the copy numbers of Mhp were treated as the ordinate（Y-axis）, so the standard curve was generated. It was found that the copy number of Mhp was highly correlated to CCU. [Conclusion] A quantitative competitive PCR assay was successfully established for the rapid detection of Mhp in culture.
[目的]本试验旨在探索一种对猪肺炎支原体(Mycoplasma hyopneumoniae)培养物中的支原体进行快速检测的竞争定量PCR方法。[方法]设计一对Mhp特异性引物,检测Mhp培养物;又根据支原体种属保守基因序列设计一对引物,通过酶切缺失法构建竞争模板,其携带与目的片段相同的引物结合区。[结果]以一系列稀释的竞争模板的对数值为横坐标(X轴),竞争模板和目标模板扩增产物的光密度比值的校正值的对数值为纵坐标(Y轴)绘制标准曲线,根据Y=0所对应的竞争模板的量推算求得支原体的拷贝数。以变色单位的对数值为X轴,支原体的拷贝数为Y轴,绘制出标准曲线,两者之间高度相关。[结论]成功建立了一种快速测定Mhp培养物中支原体量的竞争PCR方法。
基金
Supported by Jiangsu Agricultural Science and Technology Innovation Fund[CX(133066]~~
