木糖葡萄球菌荧光PCR检测方法的建立及其应用
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上海实验动物研究中心

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Establishment of qPCR method for detection of Staphylococcus xylosus and its application
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Shanghai Laboratory Animal Research Center

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    摘要:

    目的 本研究拟通过荧光定量PCR方法,建立一种木糖葡萄球菌快速灵敏的检测方法并进行应用评价。方法 本研究选择特异性gehM基因片段作为靶标合成了一套引物,建立了木糖葡萄球菌检测的qPCR方法。对木糖葡萄球菌标准菌株和其他非木糖葡萄球目标菌进行特异性分析。将木糖葡萄球菌的DNA进行10倍稀释测定其灵敏度。用送检的样本进行了临床应用并测序验证,同时与细菌培养法进行比较。结果 仅木糖葡萄球菌出现特异性扩增曲线,而其他非木糖葡萄球目标菌未出现,表明设计的引物对木糖葡萄球菌具有特异性,灵敏度为100 fg/μL,组内和组间重复性均小于3%。共检测60份临床样品,有5份样品扩增曲线为典型的S曲线,将该PCR产物测序并BLAST,该基因序列与木糖葡萄球菌的相似度为99.63%,表明该样本木糖葡萄球菌为阳性,所检样本的阳性率为8.3%,而培养法的阳性率为6.7%,荧光PCR方法阳性检出率比培养法略高。结论 本研究建立的木糖葡萄球菌的qPCR方法,,具有快速、灵敏度高、特异性强和重复性好的优点,可用于实验动物木糖葡萄球菌的检测。

    Abstract:

    Objective To establish and evaluate a method for rapid and sensitive Staphylococcus xylosus detection using qPCR. Methods This study selected the specific gehM gene fragment as the target for Staphylococcus xylosus, synthesized a set of specific primers and established a qPCR method for detection of Staphylococcus xylosus. Staphylococcus xylosus standard strain and other non taeget strains were chosen for specific analysis. Diluted the DNA of Staphylococcus xylosus to 10 times to determine its sensitivity. Clinical samples were tested and positive products were sequenced. The results were compared with those of bacterial culture. Results Staphylococcus xylosus had a specific amplification curve, while other non-Staphylococcus xylosus species did not show it, indicating that the primers were specific for Staphylococcus xylosus. The sensitivity was 100 fg DNA. The repeatabilities within and between groups are less than 3%. A total of 60 clinical samples were detected, of which 5 samples had a typical S curve. The PCR products were sequenced and BLAST. The similarity of the gene sequence was 99.63%, indicating that the sample was positive for the nucleic acid of Staphylococcus xylosus gehM gene, with a positive rate of 8.3%. However, the positive rate of bacterial culture was 6.7%. The positive rate of qPCR was slighterly higher than the culture. Conclusions The qPCR method established has the advantages of fast, high sensitivity and specificity, and can be used for the detection of Staphylococcus xylosus.

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  • 收稿日期:2023-06-12
  • 最后修改日期:2024-01-03
  • 录用日期:2024-02-25
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