関連する実験動画
Updated: Sep 10, 2025
00:08
A Rapid In Vivo Bioassay for Developmentally Active Enhancers
1.3K
PRC2関連因子EPOPは,マウスの軸性発達中のホックス遺伝子調節のために必要である
Ivano Mocavini1, Anna Mallol1, Arantxa Gutierrez1
1Centre for Genomic Regulation (CRG), The Barcelona Institute for Science and Technology, Carrer del Doctor Aiguader 88, Barcelona, 08003, Spain.
Developmental biology
|August 20, 2025
まとめ
この研究は,EPOPが適切な身体パターニングに不可欠であることを明らかにしています. EPOPはホックス遺伝子の早発を防止し,マウスの前後軸の適切な発達を保証する.
科学分野:
- 発達生物学
- エピジェネティクス
- 遺伝学
背景:
- ポリコンブ抑制複合体2 (PRC2) は遺伝子抑制を調節する.
- EPOPはマウスの胚性幹細胞でPRC2とロングインB/ Cの結合を促進し,低レベルの標的遺伝子発現を可能にします.
- EPOPのインビボ機能は,大部分は特徴づけられていなかった.
研究 の 目的:
- 胚の発達におけるEPOPのインビボの役割を調査する.
- 軸骨格のパターンと遺伝子発現に対するEPOP欠乏の影響を決定する.
- EPOPがホックス遺伝子調節に影響を与えるメカニズムを解明する.
主な方法:
- Epop ノックアウト (KO) マウスモデルの生成と分析.
- エポップ・KOマウスにおける骨格発達の現象分析
- 遺伝子発現の変化を評価するために,Epop欠乏した胚の組織特異的なRNA配列決定.
- 発達中の胚におけるホックス遺伝子発現の限界の分析
主要な成果:
- エポップKOマウスは生存可能で肥沃であるが,軸骨格の重要な後部ホメオティック変異を示している.
- 母親のEpopアレルの削除は,これらの骨格の欠陥を部分的に再現します.
- エポップが枯渇した胚は,特定のホックス遺伝子発現の前部境界のシフトを示している.
- RNAシーケンシングは,ホックス遺伝子の活性化欠陥がプレソミット性メソデームに由来することを示しています.
結論:
- EPOPは,胚の発達中にHox遺伝子のサブセットの早期活性化を防ぐ上で重要な役割を果たします.
- EPOPのこの機能は,正しい前後部体のパターンを確立するために不可欠です.
- EPOPはホックス遺伝子の発現を調節する役割があり,正常な軸性骨格形成に不可欠です.
関連する概念動画
02:23Master Transcription Regulators
7.0K
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...
7.0K
02:36RNA Polymerase II Accessory Proteins
9.4K
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...
9.4K
01:30General Transcription Factors
5.5K
Tissue-specific transcription factors contribute to diverse cellular functions in mammals. For example, the gene for beta globin, a major component of hemoglobin, is present in all cells of the body. However, it is only expressed in red blood cells because the transcription factors that can bind to the promoter sequences of the beta globin gene are only expressed in these cells. Tissue-specific transcription factors also ensure that mutations in these factors may impair only the function of...
5.5K
02:33Combinatorial Gene Control
8.4K
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...
8.4K
02:33Hedgehog Signaling Pathway
7.5K
The Hedgehog gene (Hh) was first discovered due to its control of the growth of disorganized, hair-like bristles phenotype in Drosophila, much like hedgehog spines. Hh plays a crucial role in the development of organs and the maintenance of homeostasis in both invertebrates and vertebrates. However, while Drosophila has only one Hh protein, mammals have multiple functional Hedgehog proteins - Sonic (Shh), Desert (Dhh), and Indian Hedgehog (Ihh). All of these homologous proteins have adapted to...
7.5K
01:51Determination
19.1K
During embryogenesis, cells become progressively committed to different fates through a two-step process: specification followed by determination. Specification is demonstrated by removing a segment of an early embryo, “neutrally” culturing the tissue in vitro—for example, in a petri dish with simple medium—and then observing the derivatives. If the cultured region gives rise to cell types that it would normally generate in the embryo, this means that it is specified. In...
19.1K