ZRF1によるポリコンブ抑制遺伝子の転写活性化
Holger Richly1, Luciana Rocha-Viegas, Joana Domingues Ribeiro
1Centre de Regulació Genòmica (CRG)/UPF, 08003 Barcelona, Spain.
Nature
|December 24, 2010
まとめ
ZRF1タンパク質は,ユビキチン化ヒストンH2Aと結合し,ポリコンブ抑制複合体1 (PRC1) を移動させ,細胞分化中に遺伝子転写を活性化します. この表遺伝的メカニズムは,細胞の運命決定の鍵である.
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.
- 遺伝子規制 遺伝子規制
背景:
- ヒストンの共性変異はクロマチンの動態と遺伝子転写を調節する.
- ヒストンH2Aモノウビキチネーションは,ポリコンブ媒介の転写サイレンシングと関連しているが,その正確な役割は不明である.
研究 の 目的:
- 遺伝子発現の表遺伝的調節におけるZRF1 (ズオチン関連因子1) の機能を明らかにする.
- ZRF1がユビキチン化ヒストンH2Aと相互作用し,クロマチンの状態に影響を与える分子機構を調査する.
主な方法:
- リクルートメントアッセイは,ZRF1がユビキチン化ヒストンH2Aとの相互作用を特定するためのものです.
- クロマチンの免疫プレシピテーションに続いて,ZRF1,RING1B,H2A-ubiquitinの全ゲノムマッピングのためのシーケンシング (ChIP-seq) が実施されます.
- 人間の細胞系における細胞分化の研究.
主要な成果:
- ZRF1は,ズオチン領域内の新しいユビキチン相互作用ドメインを有し,ユビキチン化ヒストンH2A (H2A-K119ub) に特定の結合を可能にします.
- ZRF1はヒストンH2Aのユビキチン化によってクロマチンに誘導され,細胞の微分化中にポリコンブ抑制複合体1 (PRC1) を積極的に置換する.
- ゲノム全体の分析により,ZRF1が,多数のポリコンブ標的遺伝子を調節する上で重要な役割を果たし,細胞の運命決定に影響を及ぼしていることが明らかになりました.
結論:
- ZRF1は,ポリコンブ抑制遺伝子の活性状態への移行を媒介する重要な表遺伝子調節体として作用します.
- ZRF1-ヒストンH2Aのユビキチネーション相互作用は,ダイナミックな遺伝子調節と細胞運命を決定するための分子機構を提供します.
関連する概念動画
RNA Polymerase II Accessory Proteins
Proteins that regulate transcription can do so either via direct contact with RNA Polymerase or through indirect interactions facilitated by adaptors, mediators, histone-modifying proteins, and nucleosome remodelers. Direct interactions to activate transcription is seen in bacteria as well as in some eukaryotic genes. In these cases, upstream activation sequences are adjacent to the promoters, and the activator proteins interact directly with the transcriptional machinery. For example, in...
Co-activators and Co-repressors
Gene transcription is regulated by the synergistic action of several proteins that form a complex at a gene regulatory site. This is observed in eukaryotes, where the regulation of gene expression is a complex process. Regulatory proteins in eukaryotes can broadly be classified into two types – regulators that bind directly to specific DNA sequences and co-regulators that associate with regulatory proteins but cannot directly bind to the DNA. These co-regulators are further divided into...
Co-activators and Co-repressors
Gene transcription is regulated by the synergistic action of several proteins that form a complex at a gene regulatory site. This is observed in eukaryotes, where the regulation of gene expression is a complex process. Regulatory proteins in eukaryotes can broadly be classified into two types – regulators that bind directly to specific DNA sequences and co-regulators that associate with regulatory proteins but cannot directly bind to the DNA. These co-regulators are further divided into...
Combinatorial Gene Control
Combinatorial gene control is the synergistic action of several transcriptional factors to regulate the expression of a single gene. The absence of one or more of these factors may lead to a significant difference in the level of gene expression or repression.
The expression of more than 30,000 genes is controlled by approximately 2000-3000 transcription factors. This is possible because a single transcription factor can recognize more than one regulatory sequence. The specificity in gene...
The expression of more than 30,000 genes is controlled by approximately 2000-3000 transcription factors. This is possible because a single transcription factor can recognize more than one regulatory sequence. The specificity in gene...
Master Transcription Regulators
Master transcription regulators are regulatory proteins that are predominantly responsible for regulating the expression of multiple genes. Often these genes work in concert to drive a complex process. Activation of a master transcription regulator can lead to a cascade of transcriptional activation necessary for that outcome. These regulators can directly bind to the regulatory sequences of the various genes involved, or they can indirectly regulate transcription by binding to regulatory...
Master Transcription Regulators
Master transcription regulators are regulatory proteins that are predominantly responsible for regulating the expression of multiple genes. Often these genes work in concert to drive a complex process. Activation of a master transcription regulator can lead to a cascade of transcriptional activation necessary for that outcome. These regulators can directly bind to the regulatory sequences of the various genes involved, or they can indirectly regulate transcription by binding to regulatory...


