长期载体中甲素耐药黄金葡萄球菌在宿主内部的基因组演变
Tine Graakjær Larsen1,2, Jose Alfredo Samaniego Castruita1, Peder Worning1
1Department of Clinical Microbiology, Copenhagen University Hospital - Amager and Hvidovre, Copenhagen, Denmark.
Applied microbiology and biotechnology
|January 12, 2024
概括
长期耐美西林黄金葡萄球菌 (MRSA) 携带者的基因组突变率大约为每年每基因组4.9个SNP. 这一比例在不同的暴露群体中保持一致,包括家庭和旅行者.
科学领域:
- 微生物学 微生物学
- 基因组学就是基因组学.
- 进化生物学 进化生物学
背景情况:
- 了解Staphylococcus aureus的基因组进化,特别是耐甲基金 Staphylococcus (MRSA),对于理解细菌适应至关重要.
- 长期携带MRSA提供了独特的机会来研究宿主内部的进化.
研究的目的:
- 为了确定长期运输期间MRSA的突变率.
- 调查家庭传播或持续暴露等因素是否影响突变率.
主要方法:
- 全基因组测序 (WGS) 对来自121个长期载体的424个MRSA分离物进行了测序 (载体时间为4-11年).
- 核心基因组多部位序列类型化 (cgMLST) 和单核酸多态化 (SNP) 分析被用于对对比.
- 计算了突变率,不包括假定的重组,并按暴露子组分层.
主要成果:
- 在长期的MRSA携带者中,观察到宿主内4.9个SNP/基因组/年的中位数突变率.
- 在家庭成员,被认为持续暴露的人 (例如旅行者) 和没有已知的持续暴露的人之间,没有发现突变率的显著差异.
- 发现单核酸多态 (SNP) 在整个基因组中随机发生,没有确定的热点.
结论:
- 在长期携带者中,MRSA的基因组突变率相对稳定,无论其暴露模式如何.
- 随机积累的SNP表明,在持续的MRSA携带过程中,没有特定的基因组区域是突变的首选目标.
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