CC180 类动力学并不能普遍解释 Streptococcus pneumoniae 血清型 3 疫苗接种后持续性:全球比较人口基因组学研究
medRxiv : the preprint server for health sciences
|September 10, 2024
概括
13性肺炎球菌合疫苗 (PCV13) 导致了Streptococcus pneumoniae血清型3的转变,Clade I 在葡萄牙占主导地位. 这个 clade 这个 clade.
科学领域:
- 微生物学与传染病的研究
- 基因组学和进化生物学
- 疫苗学 疫苗学 疫苗学
背景情况:
- 克隆复合体180 (CC180) 是3型血清杆菌肺炎 (Spn) 的主要克隆.
- 13价肺炎球菌合疫苗 (PCV13) 对3型血清杆菌的有效性有限.
- 之前的观察表明,PCV13可能控制某些CC180细胞系,而其他细胞系则持续存在,导致3型血清型的持续性.
研究的目的:
- 测试PCV13影响葡萄牙CC180血清型3 Spn种群动态的假设.
- 调查葡萄牙PCV13引入后的血清型3 Spn菌株的基因组特征和进化轨迹.
主要方法:
- 来自葡萄牙的501个血清型3 Spn菌株 (1999-2020) 的全基因组测序 (WGS).
- 遗传学分析,泛基因组概况,以及对测序菌株的全基因组关联研究 (GWAS).
- 抗生素敏感性测试和比较基因组学与超过2600个全球MLST180WGS.
主要成果:
- 在葡萄牙PCV13引入后发生了3型血清型CCs的显著转变,其中Clade I成为主导 (P<0.0001).
- 第I类菌株在很大程度上对抗生素敏感,并具有异质的泛基因组,包括phiOXC141的prophage.
- 来自葡萄牙和西班牙的菌株,其中Clade I仍然占主导地位,表现出与假设的蛋白质基因相关的较大的基因组.
结论:
- 在PCV13引入后,CC180血清型3 Spn的Clade I在葡萄牙占主导地位,尽管存在潜在的健康成本.
- 在I类菌株中,辅助基因组含量可能会减轻与前载体和抗生素敏感性相关的健康成本.
- 类动态和泛基因组异质性的区域差异表明,类特异性分析对于理解疫苗逃逸至关重要.
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