ヘテロクロマティックサイレンシングにおけるRNA干渉の役割
Zachary Lippman1, Rob Martienssen
1Watson School of Biological Sciences and Cold Spring Harbor Laboratory, 1 Bungtown Road, Cold Spring Harbor, New York 11724 USA.
Nature
|September 17, 2004
まとめ
かつては不活性と考えられていたヘテロクロマチンは,現在,遺伝子調節において重要な役割を果たしています. 小型のRNAを生成し,表遺伝的変化を誘導し,遺伝子発現,染色体行動,進化に影響を与えます.
科学分野:
- 遺伝学 遺伝学とは
- エピジェネティクス エピジェネティクス
- 分子生物学は分子生物学である.
背景:
- 密度の高い染色体物質であるヘテロクロマチンは,75年前に発見されました.
- 遺伝子サイレンシングにおけるその役割は当初認められていたが,後に議論された.
- 以前は遺伝的に無力と考えられていたが,新しい洞察は,その活発な規制機能を明らかにしている.
研究 の 目的:
- 遺伝子発現におけるヘテロクロマチンの機能に関する現代的な理解を明らかにする.
- ヘテロクロマチンから生まれた小さなRNAの役割を強調する.
- ヘテロクロマチンを重要な表遺伝子調節体として確立する.
主な方法:
- ヘテロクロマティック領域からの小さなRNAの生体生成を調査する.
- ヘテロクロマチンにおけるRNA干渉のメカニズムを分析する.
- 小型のRNAによって導かれる表遺伝子の改変を研究する.
主要な成果:
- ヘテロクロマチンは小さなRNAの源である.
- これらの小さなRNAは,RNA干渉経路を媒介する.
- 小型RNAは,ヘテロクロマティック・リピートとトランスポーザブル・エレメント内のDNAとタンパク質の表遺伝的修正を直接行います.
結論:
- ヘテロクロマチンは,表遺伝的調節に積極的に関与しています.
- ヘテロクロマチンから発生する小型のRNA経路は,遺伝子発現制御に不可欠です.
- ヘテロクロマチンは染色体の行動や進化過程に大きく影響する.
関連する概念動画
01:23Types of RNA
Overview
Three main types of RNA are involved in protein synthesis: messenger RNA (mRNA), transfer RNA (tRNA), and ribosomal RNA (rRNA). These RNAs perform diverse functions and can be broadly classified as protein-coding or non-coding RNA. Non-coding RNAs play important roles in the regulation of gene expression in response to developmental and environmental changes. Non-coding RNAs in prokaryotes can be manipulated to develop more effective antibacterial drugs for human or animal use.
RNA...
Three main types of RNA are involved in protein synthesis: messenger RNA (mRNA), transfer RNA (tRNA), and ribosomal RNA (rRNA). These RNAs perform diverse functions and can be broadly classified as protein-coding or non-coding RNA. Non-coding RNAs play important roles in the regulation of gene expression in response to developmental and environmental changes. Non-coding RNAs in prokaryotes can be manipulated to develop more effective antibacterial drugs for human or animal use.
RNA...
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...
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...
02:15Experimental 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...
01:20Types of RNA
Three main types of RNA are involved in protein synthesis: messenger RNA (mRNA), transfer RNA (tRNA), and ribosomal RNA (rRNA). These RNAs perform diverse functions and can be broadly classified as protein-coding or non-coding RNA. Non-coding RNAs play important roles in regulating gene expression in response to developmental and environmental changes. Non-coding RNAs in prokaryotes can be manipulated to develop more effective antibacterial drugs for human or animal use.
RNA Performs Diverse...
RNA Performs Diverse...