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在牛乳腺炎的金黄色葡萄球菌中,beta-lactam抵抗和逆转的基因组特征
Bigya Dhital1, Ying-Tsong Chen2, Sushil Paudyal3
1Department of Animal Science, National Chung Hsing University, Taichung 40227, Taiwan.
Letters in applied microbiology
|August 12, 2025
概括
全基因组测序发现了关键突变,使得黄金葡萄球菌 (Staphylococcus aureus) 产生β-乳酸盐耐药性. 这些耐药性突变也在乳牛乳腺炎分离物中发现,验证了体外模型的临床相关性.
科学领域:
- 微生物学 微生物学
- 基因组学就是基因组学.
- 兽医医学 兽医医学 兽医医学
背景情况:
- 黄金葡萄球菌 (Staphylococcus aureus) 的抗菌耐药性对动物和人类健康构成重大威胁.
- 了解耐药性的遗传基础对于开发有效的治疗策略至关重要.
- 乳牛乳腺炎是一种常见的感染,通常是由金黄色葡萄球菌引起的.
研究的目的:
- 通过使用全基因组测序来识别黄金葡萄球菌 (Staphylococcus aureus) 中与β-乳酸胺耐药性相关的突变.
- 为了将体外识别的耐药性突变与从乳腺炎感染的奶牛中临床分离物中发现的突变相关联.
主要方法:
- 在实验室中对 Staphylococcus aureus亚种的连续暴露. 黄金色ATCC 25923对β-乳酸抗生素产生耐药性.
- 敏感和耐药菌株的全基因组测序 (WGS),以识别与耐药性相关的突变.
- 对从乳腺炎感染的奶牛中分离出来的临床金黄色葡萄球菌的分析,以检测发现的突变的存在.
主要成果:
- 诱导的耐药性导致β-乳酸抗生素的最小抑制度 (MIC) 增加了数千倍.
- WGS揭示了编码青素结合蛋白,ABC载体ATP结合蛋白等基因的耐药性相关突变.
- 乳腺炎的临床分离物共享了同样的耐药性相关突变,在试验室中确定了这些突变.
结论:
- 实验室内选择是一种有效的方法,用于识别Staphylococcus aureus中临床相关的抗菌素耐药性突变.
- 鉴定的突变存在于实验进化和自然发生的乳腺炎S. aureus菌株中.
- 这项研究增强了我们对乳腺炎相关的金黄色葡萄球菌中抗菌素耐药性机制的理解.
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