YY1は,Xist RNAを不活性なX核化センターに結びつけている
1Howard Hughes Medical Institute, Department of Molecular Biology, Massachusetts General Hospital and Department of Genetics, Harvard Medical School, Boston, MA 02114, USA.
Cell
|July 7, 2011
まとめ
タンパク質YY1は核化センターとして作用し,XistRNAを不活性X染色体にドッキングします. この結合は,雌性哺乳類のX染色体不活性化を開始するために重要である.
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.
- 遺伝学 遺伝学とは
背景:
- XistRNAは,雌性哺乳類のX染色体不活性化を媒介する.
- XISTはX染色体に沿って広がり,遺伝子の静止を誘発する.
- Xist RNAの負荷と拡散のメカニズムは不明である.
研究 の 目的:
- Xist RNAの核化センターを特定する.
- X染色体へのXistRNA結合のメカニズムを解明する.
主な方法:
- Xist RNAの局所化におけるYY1タンパク質の役割を調査した.
- YY1の二価結合能力 (RNAとDNA) を分析した.
- エピジェネティック・レギュレーションとXistアタッチメントにおけるアレル起源を調べた.
主要な成果:
- YY1をX染色体にXistRNAをドッキングするタンパク質として識別した.
- YY1がRNAとDNAの両方に結合することを示した.
- Xistの結合がYY1部位とアレル起源によって制御されていることが示された.
- 特定のYY1-RNAとYY1-DNAの相互作用がXistロードに不可欠であることを決定しました.
結論:
- YY1は,Xist RNAの核化センターとして機能します.
- YY1はアダプタ分子として作用し,調節性RNA (Xist) をクロマチンの標的と結びつける.
- このメカニズムは,X染色体不活性化を開始するのに非常に重要です.
さらに関連する動画
関連する概念動画
RNA Splicing
Splicing is the process by which eukaryotic RNA is edited before its translation into protein. The RNA strand transcribed from eukaryotic DNA is called the primary transcript. The primary transcripts that become mRNAs are called precursor messenger RNAs (pre-mRNAs). Eukaryotic pre-mRNA contains alternating sequences of exons and introns. Exons are nucleotide sequences that code for proteins, whereas introns are the non-coding regions. In RNA splicing, introns are removed and exons are bonded...
X-Inactivation
The human X chromosome contains over ten times the number of genes as in the Y chromosome. Since males have only one X chromosome, and females have two, one might expect females to produce twice as many of the proteins, with undesirable results.
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...
Chromatin Structure Regulates pre-mRNA Processing
In eukaryotic cells, nascent mRNA transcripts need to undergo many post-transcriptional modifications to reach the cell cytoplasm and translate into functional proteins. For a long time, transcription and pre-mRNA processing were considered two independent events that occur sequentially in the cell. However, it has now been well established that transcription and pre-mRNA processing are two simultaneous processes that are precisely regulated inside the cell.
The chromatin structure, especially...
The chromatin structure, especially...
X-inactivation
The human X chromosome contains over ten times the number of genes as in the Y chromosome. Since males have only one X chromosome, and females have two, one might expect females to produce twice as many of the proteins, with undesirable results.
RNA Structure
The basic structure of RNA consists of a string of ribonucleotides attached by phosphodiester bonds. Although most RNA is single-stranded, it can form complex secondary and tertiary structures. Such structures play essential roles in the regulation of transcription and translation.
Different Types of RNA Have the Same Basic Structure
There are three main types of ribonucleic acid (RNA) involved in protein synthesis: messenger RNA (mRNA), transfer RNA (tRNA), and ribosomal RNA (rRNA). All three...
Different Types of RNA Have the Same Basic Structure
There are three main types of ribonucleic acid (RNA) involved in protein synthesis: messenger RNA (mRNA), transfer RNA (tRNA), and ribosomal RNA (rRNA). All three...


