对临床分离物体的基因组再评估揭示了一个结构化的Streptococcus suis复合体
Kevin Li1, Sonia Lacouture1, Lucy A Weinert2
1Groupe de recherche sur les maladies infectieuses en production animale and Centre de recherche en infectiologie porcine et avicole, Faculté de médecine vétérinaire, Université de Montréal, Saint-Hyacinthe, Québec, Canada.
Journal of clinical microbiology
|October 31, 2025
概括
通过目前的方法,很难准确识别Streptococcus suis和相关物种. 全基因组测序揭示了显著的多样性,突出了改善诊断的需要,以了解更广泛的Streptococcus suis复合体及其对动物健康的影响.
科学领域:
- 兽医微生物学 兽医微生物学
- 细菌的分类学 细菌的分类学
- 基因组学就是基因组学.
背景情况:
- 由于诊断工具的分辨率有限和分类框架不完整,对Streptococcus suis和相关细菌的精确物种级别识别受到阻碍.
- 目前的诊断方法,如MALDI-TOF MS和recN PCR可以错误识别类似S. suis的分离物,从而导致潜在的诊断差距.
- 最近对新物种的识别表明了更广泛的,以前未被识别的S. suis复合体.
研究的目的:
- 通过常见的诊断方法错误识别的S. suis样分离物的分类学身份.
- 评估当前诊断工具在区分S. suis与其近亲的有效性.
- 为结构化的S. suis复合体提供基因组证据,并确定改善诊断的潜在标记物.
主要方法:
- 61个猪和3个牛的全基因组测序,最初被马尔迪-托夫 (MALDI-TOF) 确定为S. suis.
- 使用核心基因组和recN基因序列进行了家族遗传学分析.
- 鉴定特定于S. suis sensu stricto的保存基因.
主要成果:
- 在64个分离物中,只有4个被确认为S. suis sensu stricto;大多数属于其他已知的或新提出的Streptococcus物种.
- 遗传学分析显示,在类似于S. suis的生物体中,有广泛的分类学多样性.
- 由于分辨率和重组的有限性,recN基因系谱不能可靠地反映物种界限,影响诊断准确性.
结论:
- 目前的诊断方法不足以在S. suis复合体内准确地确定物种级别.
- 基于基因组的方法对于区分S. suis复合体成员至关重要.
- 这项研究支持更广泛的S. suis复合体的认可,并突出了新发现物种的潜在临床意义.
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