抗真菌药物耐药性通过依赖RNAi的表皮突变引起
Silvia Calo1, Cecelia Shertz-Wall1, Soo Chan Lee1
1Department of Molecular Genetics and Microbiology, Duke University Medical Center, Durham, North Carolina 27710, USA.
Nature
|August 1, 2014
概括
甲状腺真菌 (Mucor circinelloides) 通过稳定的孟德尔基因突变或不稳定的表观遗传RNA干扰 (RNAi) 介导的fkbA基因沉默而发展出抗真菌药物耐药性.
科学领域:
- 菌类学 菌类学是指菌类学.
- 分子生物学分子生物学
- 遗传学 是一个遗传学.
背景情况:
- 微生物发展出各种不同的适应机制.
- 抗真菌药物耐药性是一个日益严重的公共卫生问题.
- 人类真菌病原体Mucor circinelloides的适应机制尚未完全理解.
研究的目的:
- 研究Mucor circinelloides中对抗真菌药物FK506 (塔克罗利斯) 的自发耐药性机制.
- 阐明孟德尔突变和表观遗传途径在耐药性中的作用.
- 发现基于RNA干扰 (RNAi) 的新型表皮化机制.
主要方法:
- 对fkba,cnbR和cnaA基因突变的遗传分析.
- 评估FK506的耐药性和细胞生长.
- RNA干扰 (RNAi) 路径分析.
- 检测fkbA小RNA和反意义RNA的产生.
主要成果:
- 确定了FK506抗性的两个不同的机制:稳定的孟德尔基因突变和不稳定的RNAi介导的fkbA.的表观遗传沉默.
- 通过RNAi介导的沉默导致耐药性表皮质,这些表皮质很容易恢复到敏感的表型.
- 沉默涉及产生双链RNA触发器,并需要RNAi途径.
- 耐FK506的表与丰富的FKbA小RNA有关.
结论:
- 甲状腺菌使用一种新的基于表观遗传RNAi的表观塑性和药物耐药性的表观塑性表化机制.
- 这种机制提供了一个快速的,虽然不稳定的,适应战略.
- 这些发现对理解抗微生物药物耐药性和真核生物中的RNAi调节有意义.
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