对抗RNA病毒的阿尔戈诺特独立的,Dicer依赖的抗病毒防御
Yukiyo Sato1, Hideki Kondo1, Nobuhiro Suzuki1
1Institute of Plant Science and Resources, Okayama University, Kurashiki, Okayama 710-0046, Japan.
概括
抗病毒RNA干扰可以在没有Argonaute的情况下发生,仅依靠Dicer. 这种Dicer-only防御有效地阻止了真菌中的RNA病毒复制,揭示了一个新的抗病毒机制.
科学领域:
- 分子生物学分子生物学
- 菌类学 菌类学是指菌类学.
- 病毒学 病毒学
背景情况:
- 抗病毒RNA干扰 (RNAi) 是一种保存的防御机制.
- 迪克将病毒RNA加工成小RNA,指导阿尔戈诺特降解病毒RNA.
- 阿尔戈纳特传统上被认为是抗病毒RNAi必不可少的.
研究的目的:
- 在*Cryphonectria parasitica*中调查阿尔戈纳特独立的抗病毒RNAi.
- 确定Dicer和Argonaute在对各种RNA病毒的抗病毒防御中的作用.
- 为了探索Dicer-only防御机制和病毒易感性.
主要方法:
- 在C. parasitica*中产生了一到四倍的*agl* (类似阿尔戈诺特的) 淘汰突变.
- 被破坏的 *dcl* (Dicer-like) 基因与 *agl* 突变相结合.
- 在产生的突变体中对dsRNA和ssRNA病毒进行评估的抗病毒活性.
主要成果:
- 单独的Dicer-like 2 (DCL2),没有Argonaute,对某些RNA病毒具有抗病毒活性.
- 观察到DCL2依赖的,与阿尔戈诺特独立的抗病毒防御对抗dsRNA病毒.
- 不同的RNA病毒对Dicer-only防御表现出不同的敏感性.
结论:
- 在抗病毒RNAi中,阿尔戈纳特并不是普遍必不可少的.
- 在C. parasitica*中存在一个单独的Dicer抗病毒防御机制.
- 病毒RNA结构和序列影响对Dicer介导抗病毒防御的易感性.
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