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Updated: Jun 13, 2026

11:09
Chromatin Isolation by RNA Purification (ChIRP)
Published on: March 25, 2012
長い非コーディングRNAHOTAIRは,がんの転移を促進するためにクロマチンの状態を再プログラムします
Rajnish A Gupta1, Nilay Shah, Kevin C Wang
1Howard Hughes Medical Institute and Program in Epithelial Biology, California 94305, USA.
Nature
|April 16, 2010
まとめ
大量の干渉非コーディングRNA (lincRNAs) は乳がんでは調節不良です. lincRNA HOTAIRはクロマチンを変化させることで転移を促進し,診断および治療の標的として示唆します.
科学分野:
- 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.
- 腫瘍学 腫瘍学
背景:
- 大量の干渉非コーディングRNA (lincRNAs) は全ゲノムに転写されるが,ヒトの病気におけるその役割は不明である.
- 新興の証拠は,lincRNAsがクロマチンの改造複合体と相互作用することを示唆しています.
- HOX loci lincRNAsの失調は,がんの進行に関与しています.
研究 の 目的:
- 乳がんの進行におけるlincRNAs,特にHOTAIRの役割を調査する.
- HOTAIR発現が転移と患者の生存を予測するかどうかを判断する.
- HOTAIRががん細胞の行動に影響を与える分子メカニズムを解明する.
主な方法:
- 乳がんの原発性腫瘍および転移におけるlincRNA発現の分析.
- HOTAIR発現レベルと臨床結果の相関.
- 癌細胞における強制されたHOTAIR発現またはHOTAIRノックダウンを含む機能的研究.
- ポリコンブ抑制複合体2 (PRC2) 結合を評価するためのクロマチン免疫降低配列解析 (ChIP-seq)
- ヒストンのメチル化分析 (H3K27me3) と遺伝子発現プロファイリング.
主要な成果:
- HOTAIR発現は乳がんおよび転移で上昇し,予後が悪いと相関しています.
- 癌細胞における強制的なHOTAIR発現は,全ゲノムにわたるPRC2の再分配につながります.
- このPRC2再配分はヒストンのメチル化と遺伝子発現を変化させ,侵入性と転移を促進します.
- HOTAIRの転移前効果は,PRC2の活動に依存しています.
- HOTAIRの喪失は,特にPRC2活性が高い細胞において,侵入性を抑制する.
結論:
- HOTAIRで例示された lincRNAs は,がんの表遺伝子組を形作る上で積極的な役割を果たしています.
- HOTAIRは,PRC2媒介の表遺伝子改変により,乳がんの転移を促進する.
- HOTAIRは,乳がん転移の潜在的バイオマーカーであり,治療目標である.
関連する概念動画
lncRNA - Long Non-coding RNAs
In humans, more than 80% of the genome gets transcribed. However, only around 2% of the genome codes for proteins. The remaining part produces non-coding RNAs which includes ribosomal RNAs, transfer RNAs, telomerase RNAs, and regulatory RNAs, among other types. A large number of regulatory non-coding RNAs have been classified into two groups depending upon their length – small non-coding RNAs, such as microRNA, which are less than 200 nucleotides in length, and long non-coding RNA (lncRNA)...
lncRNA - Long Non-coding RNAs
In humans, more than 80% of the genome gets transcribed. However, only around 2% of the genome codes for proteins. The remaining part produces non-coding RNAs which includes ribosomal RNAs, transfer RNAs, telomerase RNAs, and regulatory RNAs, among other types. A large number of regulatory non-coding RNAs have been classified into two groups depending upon their length – small non-coding RNAs, such as microRNA, which are less than 200 nucleotides in length, and long non-coding RNA (lncRNA)...
Types 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...
Types 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.
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Inheritance 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...
Epigenetic Regulation
Epigenetic changes alter the physical structure of the DNA without changing the genetic sequence and often regulate whether genes are turned on or off. This regulation ensures that each cell produces only proteins necessary for its function. For example, proteins that promote bone growth are not produced in muscle cells. Epigenetic mechanisms play an essential role in healthy development. Conversely, precisely regulated epigenetic mechanisms are disrupted in diseases like cancer.
X-chromosome...
X-chromosome...