A New Multiplex PCR Assay for Simultaneously Detecting Mycoplasma ovipneumoniae and Corynebacterium pseudotuberculosis in Diseased Goats and Sheep
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摘要:
目的 为实现临床上对绵羊肺炎支原体(Mycoplasma ovipneumoniae, Mo)和山羊伪结核棒状杆菌(Corynebacterium pseudotuberculosis, CP)两种病原混合感染的同时检测,建立Mo和CP的双重PCR检测方法。 方法 应用基于Mo的P80基因和CP的PLD基因设计两对特异性引物,对反应体系和条件进行优化,验证方法的特异性、灵敏性和重复性;应用该方法和单一PCR方法对临床收集的70份样品进行检测,比较检测结果。 结果 建立的Mo和CP的双重PCR检测方法能够同时扩增出Mo 700 bp和CP 290 bp左右的片段,而对其他羊病常见病原的DNA扩增均为阴性。Mo和CP的检测下限分别为1 530 pg·μL−1和3 500 pg·μL−1。该方法具有良好的重复性。临床样品检测结果显示:70份临床样品中Mo阳性率为25.71%,CP阳性率为18.57%,同时感染Mo和CP阳性率为7.14%,与单一PCR检测结果符合率为100%。 结论 本研究建立的双重PCR检测方法具有特异性强、灵敏性较高、重复性好等特点,为临床上Mo和CP混合感染的快速检测以及流行病学调查提供了实用方法。 Abstract:Objective To establish a multiplex PCR method for simultaneous clinic detection of Mycoplasma ovipneumoniae (Mo), one of the main pathogens causing Mycoplasma pneumonia of goats and sheep(MPGS), and Corynebacterium pseudotuberculosis (CP), the pathogen of goat pseudotuberculosis, in the livestock animals infected by both pathogens at a same time. Method Two pairs of specific primers were designed based on the P80 gene of Mo and the PLD gene of CP for the PCR. After optimizing the detection system and reaction conditions, the specificity, sensitivity, and repeatability of the new method were verified for methodology validation. The results obtained using two separate PCR and the multiplex PCR on 70 clinical specimens were comparatively analyzed. Result The newly developed multiplex PCR method amplified a 700 bp fragment from Mo and a 290 bp fragment from CP, with none from other common pathogens of goats and sheep. The method had a detection limit of 1 530 pg·μL−1 on Mo and 3 500 pg·μL−1 on CP with a high repeatability. A test on 70 clinical specimens using the new method yielded a 25.71% positive rate on Mo, 18.57% on CP, and 7.14% on Mo/CP infections. Its coincidence rate with the two single PCR results was 100%. Conclusion The newly established multiplex PCR detection methodology exhibited high specificity, sensitivity, and reproducibility. It appeared to be applicable for rapid and simultaneous clinic detection on Mo and CP as well as epidemiological studies on the disease infected by the pathogens. -
图 3 双重PCR灵敏性试验
注:M: 2 000 DNA Ladder;1: Mo+CP阳性对照;2–9: 分别为101、102、103、104、105、106、107、108倍稀释的含Mo和CP的阳性样本;10: 阴性对照。
Figure 3. Sensitivity of multiplex PCR
Note:M: 2 000 DNA Ladder; 1: Mo and CP positive control; 2–9: positive specimens containing Mo and CP diluted 101, 102, 103, 104, 105, 106, 107, 108 times, respectively; 10: negative control.
图 4 单一PCR灵敏性试验
注:A中,M: 2 000 DNA Ladder;1: Mo阳性对照;2–9: 分别为101、102、103、104、105、106、107、108倍稀释的含Mo的阳性样本;10: 阴性对照;B中,M: 2 000 DNA Ladder;1: CP 阳性对照;2–9分别为101、102、103、104、105、106、107、108倍稀释的含CP 的阳性样本;10: 阴性对照。
Figure 4. Sensitivity of single PCR
Note:A:M: 2 000 DNA Ladder; 1: Mo positive control; 2–9: positive specimens containing Mo diluted 101,102,103,104,105,106,107,108 times, respectively; 10: negative control; B: M: 2 000 DNA Ladder; 1: CP positive control; 2–9: positive specimens containing CP diluted 101,102,103,104,105,106,107,108 times, respectively; 10: negative control.
表 1 引物序列
Table 1. Primer sequence
靶基因
Target gene引物名称
Primer name引物序列(5′→ 3′)
Primer sequence(5′→ 3′)扩增片段大小
Amplified fragment size/bpP80基因 F1 GCCTTGGGGTTGGAATTCCTTTGTCTTATTC 705 R1 CATTTGATGCTGAGGTCGGATTTGGACTAAC PLD基因 F2 GTGAGAAGAACCCCGGTATAAG 291 R2 TACCGCACTTATTCTGACACTG 表 2 临床样品检测结果
Table 2. Detection of pathogens on clinical specimens
样品名称
Sample nameMo阳性率
Mo positive rate/%CP阳性率
CP positive rate/%Mo + CP阳性率
Mo + CP positive rate/%鼻拭子
Nasal cotton swab18.60 11.63 4.65 肺组织
Lung tissue37.04 29.63 11.11 所有样品
All samples25.71 18.57 7.14 -
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