一种保存的siRNA降解RNase会在C. elegans中负面调节RNA干扰
Scott Kennedy1, Duo Wang, Gary Ruvkun
1Department of Molecular Biology, Massachusetts General Hospital and Department of Genetics, Harvard Medical School, Boston, Massachusetts 02114, USA.
Nature
|February 13, 2004
概括
埃里-1基因突变通过增加短干扰RNA积累来增强RNA干扰敏感性. 这表明ERI-1充当负调节剂,控制RNA干扰持续时间和特异性.
科学领域:
- 分子生物学分子生物学
- 遗传学 是一个遗传学.
- 生物化学 生物化学
背景情况:
- RNA干扰 (RNAi) 是一种保存的生物过程,其中双链RNA (dsRNA) 触发同源信使RNA (mRNA) 的降解.
- RNAi的效率各不相同,许多mRNA和几乎所有的神经系统mRNA对这个过程具有耐火性.
- 在对表现出对dsRNA敏感度增加的C. elegans突变物进行选时,确定了eri-1基因.
研究的目的:
- 研究eri-1基因的功能及其在调节RNA干扰中的作用.
- 描述eri-1的蛋白质产物及其酶活性.
- 了解ERI-1在控制RNAi通路中的影响.
主要方法:
- 在C. elegans中进行遗传查,以识别具有增强RNAi敏感性的突变物.
- 对eri-1基因及其蛋白质产物进行分子克隆和表征.
- 采用纯化的C. elegans ERI-1及其人类正方体进行体外酶分析,以评估siRNA降解活性.
主要成果:
- 与野生动物相比,eri-1的突变导致dRNA或siRNA暴露后短干扰RNA (siRNA) 的积累增加.
- 埃里-1基因编码了一种具有核酸结合和外核酶域的进化保守蛋白质.
- 无论是C. elegans ERI-1还是人类的正经体,都在体外表现出降解siRNAs的活性.
- ERI-1主要定位在细胞质中,在性腺和特定神经元中表达较高,这表明RNAi的组织特异性调节.
结论:
- ERI-1 作为RNA干扰的负调节器,可能通过降解siRNAs来起作用.
- ERI-1的活性可能会限制RNAi的持续时间,细胞类型特异性和内生功能.
- 了解ERI-1的作用,可以了解不同生物和组织中RNAi通路的微调.
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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...
Small interfering RNAs (siRNA)
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...
