在 Mycobacterium smegmatis 和 Mycobacterium abscessus 中的人口异质性
Sarah E M Born1, Matthew J Reichlen1, Iona L Bartek1
1Department of Immunology and Microbiology, University of Colorado Anschutz Medical Campus, Aurora, Colorado, USA.
Microbiology (Reading, England)
|October 20, 2023
概括
菌根菌表现出种群异质性,具有光滑和粗的变体,影响适应和感染. 聚合促进了向粗形式的转变,影响了药物耐受性和疾病结果.
科学领域:
- 微生物学 微生物学
- 细菌病原体的产生
- 人口动态 人口动态
背景情况:
- 细菌利用人口异质性作为注策略来应对环境挑战.
- 现型变异在细菌中已知,但在真菌细菌中不明,包括影响环境因素.
- 结核菌菌只有粗的形式存在,而M. smegmatis和M. abscessus则表现出光滑和粗的形态.
研究的目的:
- 研究菌根菌群异质性,专注于M. smegmatis和M. abscessus的形态变异.
- 确定影响平滑和粗形态之间的转变的环境因素.
- 了解异质性在菌根细菌适应,耐药性和感染中的作用.
主要方法:
- 在各种条件下培养M. smegmatis和M. abscessus,包括静态和皮质培养.
- 使用可复制的方法对形态变体 (光滑,粗,中间) 进行表征.
- 分析变体之间的生长速度,生物膜形成,细胞壁组成和药物耐受性的差异.
- 研究Lsr2调节器在M. smegmatis形态型确定中的作用.
主要成果:
- 在M. smegmatis中发现了三种可复制的形态变异 (光滑,粗,中间).
- 随着时间的推移,在M. smegmatis和M. abscessus的静态培养中观察到从光滑到粗形态的转变.
- 在皮膜培养中粗略形态型的较高频率表明聚合促进了这种转变.
- 在M. smegmatis中删除lsr2将中间形态转移到光滑,但不能完全复制自然光滑的形状.
- 变种在生长,生物膜形成,细胞壁组成和药物耐受性方面表现出差异.
结论:
- 菌根菌群异质性,体现在殖民地形态型,是一个可复制和编程的现象.
- 环境因素,特别是聚合,促进了向粗形态型的转变.
- 这种异质性在适应不同环境方面发挥着作用,并可能影响感染进展和治疗反应.
- Lsr2调节器参与,但不仅仅负责,控制菌根菌形态型.
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