在Caenorhabditis elegans中动物病毒复制和RNAi介导的抗病毒沉默
1Institute for Integrative Genome Biology and Department of Plant Pathology, University of California, Riverside, CA 92521.
Nature
|August 19, 2005
概括
线虫虫Caenorhabditis elegans可以复制病毒,触发RNA干扰 (RNAi) 抗病毒防御. 这一发现为研究动物病毒与宿主相互作用建立了新的模型.
科学领域:
- 病毒学 病毒学
- 分子生物学分子生物学
- 免疫学 免疫学 免疫学
背景情况:
- 凯诺哈比迪斯 (Caenorhabditis elegans) 是生物研究的模型生物体,包括宿主对病原体的反应.
- 虽然植物和昆虫利用多个Dicer酶进行抗病毒RNA干扰 (RNAi),但单个Dicer在虫和哺乳动物中的作用尚不清楚.
- 在C. elegans中病毒复制以前没有被确立.
研究的目的:
- 为了研究C. elegans病毒复制的潜力.
- 为了确定C. elegans是否具有类似于植物和昆虫的RNAi介导抗病毒防御机制.
- 为研究动物病毒与宿主相互作用建立一个C. elegans模型.
主要方法:
- 在C. elegans.中实现了群屋病毒 (FHV) RNA基因组的完整复制.
- 分析了由FHV复制引发的抗病毒沉默.
- 评估了阿尔戈诺特蛋白质RDE-1在RNAi介导的抗病毒免疫力中的作用.
- 研究了FHV B2蛋白对RNAi抑制的影响.
主要成果:
- 群室病毒 (FHV) 在C. elegans中完全复制.
- FHV复制诱导了一种强大的抗病毒沉默反应,这取决于RDE-1,Argonaute蛋白对于小干扰RNA (siRNA) 途径至关重要.
- 这种抗病毒免疫力有效清除病毒,即使缺少RNAi抑制剂的病毒B2蛋白.
- 这些发现表明,C. elegans采用基于siRNA的抗病毒防御.
结论:
- C. elegans支持FHV的完整复制,使其成为动物病毒与宿主相互作用研究的模型.
- 这项研究揭示了C. elegans中RNAi介导的抗病毒免疫力,该免疫力依赖于RDE-1/siRNA通路.
- 这项研究表明,哺乳动物也可能利用siRNA途径进行抗病毒反应.
相关概念视频
RNA Interference
RNA interference (RNAi) is a process in which a small non-coding RNA molecule blocks the post-transcriptional expression of a gene by binding to its messenger RNA (mRNA) and preventing the protein from being translated.
This process occurs naturally in cells, often through the activity of genomically-encoded microRNAs. Researchers can take advantage of this mechanism by introducing synthetic RNAs to deactivate specific genes for research or therapeutic purposes. For example, RNAi could be used...
This process occurs naturally in cells, often through the activity of genomically-encoded microRNAs. Researchers can take advantage of this mechanism by introducing synthetic RNAs to deactivate specific genes for research or therapeutic purposes. For example, RNAi could be used...
RNA Interference
RNA interference (RNAi) is a process in which a small non-coding RNA molecule blocks the post-transcriptional expression of a gene by binding to its messenger RNA (mRNA) and preventing the protein from being translated.
This process occurs naturally in cells, often through the activity of genomically-encoded microRNAs. Researchers can take advantage of this mechanism by introducing synthetic RNAs to deactivate specific genes for research or therapeutic purposes. For example, RNAi could be used...
This process occurs naturally in cells, often through the activity of genomically-encoded microRNAs. Researchers can take advantage of this mechanism by introducing synthetic RNAs to deactivate specific genes for research or therapeutic purposes. For example, RNAi could be used...
siRNA - Small Interfering RNAs
Small interfering RNAs, or siRNAs, are short regulatory RNA molecules that can silence genes post-transcriptionally, as well as the transcriptional level in some cases. siRNAs are important for protecting cells against viral infections and silencing transposable genetic elements.
In the cytoplasm, siRNA is processed from a double-stranded RNA, which comes from either endogenous DNA transcription or exogenous sources like a virus. This double-stranded RNA is then cleaved by the ATP-dependent...
In the cytoplasm, siRNA is processed from a double-stranded RNA, which comes from either endogenous DNA transcription or exogenous sources like a virus. This double-stranded RNA is then cleaved by the ATP-dependent...
piRNA - Piwi-interacting RNAs
PIWI-interacting RNAs, or piRNAs, are the most abundant short non-coding RNAs. More than 20,000 genes have been found in humans that code for piRNAs while only 2000 genes have been found for miRNAs. piRNAs can act at the transcriptional and post-transcriptional levels and have a vital role in silencing transposable elements present in germ cells. They are also involved in epigenetic silencing and activation. Previously, they were thought to function only in germ cells but new evidence suggests...
Experimental RNAi
RNA interference (RNAi) is a cellular mechanism that inhibits gene expression by suppressing its transcription or activating the RNA degradation process. The mechanism was discovered by Andrew Fire and Craig Mello in 1998 in plants. Today, it is observed in almost all eukaryotes, including protozoa, flies, nematodes, insects, parasites, and mammals. This precise cellular mechanism of gene silencing has been developed into a technique that provides an efficient way to identify and determine the...
Viruses with RNA Genomes
RNA viruses are categorized into positive-strand, negative-strand, or double-stranded groups based on their genomic structure and replication mechanisms. This classification dictates how they exploit host cellular machinery for protein synthesis and replication. Some RNA viruses also utilize reverse transcription as part of their life cycle, further diversifying their replication strategies.Positive-Strand RNA VirusesPositive-strand RNA viruses have genomes that function directly as messenger...


