一个独特的小RNA途径使生殖线中的自私遗传元素沉默
Vasily V Vagin1, Alla Sigova, Chengjian Li
1Department of Biochemistry and Molecular Pharmacology, University of Massachusetts Medical School, Worcester, MA 01605, USA.
Science (New York, N.Y.)
|July 1, 2006
概括
在Drosophila中,重复关联的小干扰RNAs (rasiRNAs) 通过沉默重复的元素来保护生殖系. 这种独特的途径利用Piwi蛋白质,与miRNA和RNA干扰机制不同.
科学领域:
- 遗传学 遗传学 是一个
- 分子生物学分子生物学
- 表观遗传学 在表观遗传学中,表观遗传学是指表观遗传学.
背景情况:
- 德洛索菲拉生殖系利用小RNA来保持基因组的稳定性.
- 重复关联的小干扰RNA (rasiRNAs) 沉默了自私的遗传元素.
- 现有的途径包括微RNAs (miRNAs) 和RNA干扰 (RNAi).
研究的目的:
- 阐明 rasiRNAs 的独特生物发生和功能.
- 为了区分rasiRNA路径与miRNA和RNAi路径.
- 了解 rasiRNA 在维持生殖系基因组稳定性中的作用.
主要方法:
- 对Drosophila生殖系中小RNA种群的分析.
- 对Dicer酶参与rasiRNA生产的研究.
- 对 rasiRNAs 的终端修饰的表征.
- 确定参与 rasiRNA 功能的阿尔戈诺特蛋白子家族.
主要成果:
- rasiRNAs主要来自前体的反意义链.
- rasiRNA的产生不需要Dicer-1 (对于miRNAs) 或Dicer-2 (对于siRNAs).
- rasiRNAs缺乏动物siRNAs和miRNAs的特有的2',3'基末端.
- rasiRNAs通过Piwi Argonaute蛋白质子家族发挥作用,与siRNAs和miRNAs使用的Ago蛋白质不同.
结论:
- rasiRNAs代表了Drosophila中的一个独特的小RNA类.
- rasiRNA 途径在机理上与 miRNA 和 RNA 干扰途径不同.
- rasiRNAs在保护多菌生殖系免受重复元素引起的基因组不稳定性方面发挥着至关重要的作用.
更多相关视频
10:31Enhanced Crosslinking Immunoprecipitation (eCLIP) Method for Efficient Identification of Protein-bound RNA in Mouse Testis
Published on: May 10, 2019
10:28Analysis of Transgenerational Epigenetic Inheritance in C. elegans Using a Fluorescent Reporter and Chromatin Immunoprecipitation (ChIP)
Published on: May 5, 2023
相关概念视频
01:23RNA 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...
03:17Inheritance of Chromatin Structures
Epigenetics is the study of inherited changes in a cell's phenotype without changing the DNA sequences. It provides a form of memory for the differential gene expression pattern to maintain cell lineage, position-effect variegation, dosage compensation, and maintenance of chromatin structures such as telomeres and centromeres. For example, the structure and location of the centromere on chromosomes are epigenetically inherited. Its functionality is not dictated or ensured by the underlying DNA...
01:23RNA 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...
02:30siRNA - 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...
02:57piRNA - 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...
02:15Experimental 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...