开发一种测试以区分Actinobacillus pleuropneumoniae9和11血清型的挑战
José Luis Arnal Bernal1, Ana Belén Fernández Ros1, Sonia Lacouture2
1Exopol. Polígono, río Gállego D14, 50840 San Mateo de Gállego, Spain.
Microorganisms
|February 26, 2025
概括
区分Actinobacillus pleuropneumoniae9型和11型是很困难的. 这是很难的. 一种新的qPCR试验显示出局限性,揭示了囊多糖体 (CPS) 位点中的遗传变异,需要全面的基因分析来准确的血清型定型.
科学领域:
- 兽医微生物学 兽医微生物学
- 细菌病原体的产生
- 分子诊断学 分子诊断
背景情况:
- pleuropneumoniae 是一个重要的猪病原体,有 19 种血清型.
- 鉴于目前的诊断方法,区分9型和11型血清型是具有挑战性的.
- 囊多糖体 (CPS) 位点是血清型分类的关键.
研究的目的:
- 开发和验证一种新的诊断方法,用于区分Actinobacillus pleuropneumoniae血清型9和11.
- 研究临床分离物体的CPS和O-抗原 (O-Ag) 位点内的遗传变异.
- 评估分子测试的可行性,以获得准确的血清型.
主要方法:
- 基于锁定核酸 (LNA) 探针的定量PCR (qPCR) 试验的开发和验证.
- 对所有19种血清型的参考菌株进行测试.
- 使用LNA-qPCR,血清学方法,纳米孔测序和全基因组测序对临床分离物的分析.
- 对cps和O-Ag位点进行基因变异的研究.
主要成果:
- LNA-qPCR测定显示了9型血清基准菌株的特异性,但与临床分离物发现了差异.
- 全基因组测序揭示了cpsF基因在之前被确定为9或11血清型的分离物中存在显著的遗传变异.
- 多个遗传事件有助于9型血清型CPS结构,使单个qPCR检测方法复杂化.
- O-Ag位点显示的差异很小,但一些突变可能会影响O-Ag表达.
结论:
- 由于复杂的遗传变异,单个qPCR试验不足以可靠地区分Actinobacillus pleuropneumoniae9和11血清型.
- 目前需要对cpsF基因进行全面的分析,以准确确定血清型.
- 第三代测序技术提供了可行性,但受到日常诊断的可访问性,成本和周转时间的限制.
- 对于具有挑战性的案例,将混合血清器定为9/11仍然是一个实用的方法.
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