リムブ・ブド・エクトダームのラジカル・フリンジの発現は,アピカル・エクトダーマ・リッジ形成を調節する
1Department of Genetics, Harvard Medical School, Boston, Massachusetts 02115, USA.
Nature
|March 27, 1997
まとめ
肢体の発達に不可欠なアピカル外皮脊は,Radical fringe遺伝子発現によって定義された境界で形成されます. 脊椎動物におけるこのプロセスは,ドロソフィラの翼の発達に類似しており,Engrailed-1抑制を伴う.
科学分野:
- 発達生物学 発達生物学とは
- 分子遺伝学 分子遺伝学
- 比較胚生物学について
背景:
- アピカル外皮脊 (AER) は,脊椎動物の四肢のパターニングに不可欠です.
- AERの形成は,正確な遺伝子発現の境界に依存しています.
- フリンジ遺伝子は,ドロソフィラに見られるように,発達境界のレギュレータとして知られています.
研究 の 目的:
- 脊椎動物の四肢の発達におけるアピカル・エクトダーマル・リッジの形成を調節する分子メカニズムを解明する.
- AERの設立におけるラジカル・フリンジの役割を調査する.
- AER形成とドロソフィラの翼縁の発達を比較するために.
主な方法:
- 鶏手足の芽の遺伝子発現パターンの分析.
- Radical fringeとEngrailed-1.0の規制関係の調査について
- ドロソフィラの翼発達モデルとの比較分析.
主要な成果:
- ラジカルフリンジ表現は,脊椎動物の肢体におけるAER形成の境界を定義する.
- ベントラルエクトダームのEngrailed-1は,ドーサルエクトダームのラディカルフリンジの発現を抑制する.
- このメカニズムは,ドロソフィラの翼のパターニングにおけるフリンジの役割に平行しています.
結論:
- ラジカル・フリンジによって定義される境界は,AER形成およびその後の四肢のパターニングに不可欠です.
- Engrailed-1は,ラジカル・フリンジ・エクスペリション・ドメインを確立する上で重要な抑制剤として機能する.
- 脊椎動物のAER形成は,ドロソフィラの翼縁の発達と保存された規制原則を共有しています.
さらに関連する動画
08:04Application of Impermeable Barriers Combined with Candidate Factor Soaked Beads to Study Inductive Signals in the Chick
Published on: November 17, 2016
08:08Chicken Recombinant Limbs Assay to Understand Morphogenesis, Patterning, and Early Steps in Cell Differentiation
Published on: January 12, 2022
関連する概念動画
Neurulation
Neurulation is the embryological process which forms the precursors of the central nervous system and occurs after gastrulation has established the three primary cell layers of the embryo: ectoderm, mesoderm, and endoderm. In humans, the majority of this system is formed via primary neurulation, in which the central portion of the ectoderm—originally appearing as a flat sheet of cells—folds upwards and inwards, sealing off to form a hollow neural tube. As development proceeds, the anterior...
Determination
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 contrast, determination...
Non-Canonical Wnt Signaling Pathways
Wnt is a zygotic effect gene that is expressed during very early embryonic development. It regulates various processes in animals starting from early development through the adult stage, such as organogenesis in the embryo and maintenance of neuronal and blood stem cells. Wnt proteins can induce a wide variety of intracellular pathways depending upon the specific abilities of different Wnt ligands to form a complex with shared and cognate receptors in the presence of different co-receptors. The...
Role of Ephrin-Eph Signalling in Intestinal Stem Cell Renewal
Erythropoietin-producing hepatocellular carcinoma receptor (Eph) and its ligand, Eph receptor-interacting protein (Ephrin) were first discovered in the human carcinoma cell line, hence the name. Ephrin-Eph interaction guides cells to reach their appropriate location in adult tissues. They also play an essential role in the immune system by helping in immune cell migration, adhesion, and activation. Based on their structure and function, Eph is divided into two classes — EphA and EphB.
Changes in the Appendicular Skeleton with Age
The upper and lower limb initially develops as a small bulge called a limb bud, which appears on the lateral side of the early embryo. The upper limb bud appears near the end of the fourth week of development, with the lower limb bud appearing shortly after.
Initially, the limb buds consist of a core of mesenchyme covered by a layer of ectoderm. The ectoderm at the end of the limb bud thickens to form a narrow crest called the apical ectodermal ridge. This ridge stimulates the underlying...
Initially, the limb buds consist of a core of mesenchyme covered by a layer of ectoderm. The ectoderm at the end of the limb bud thickens to form a narrow crest called the apical ectodermal ridge. This ridge stimulates the underlying...
Role Of Notch Signalling In Intestinal Stem Cell Renewal
Notch signaling was first discovered in Drosophila melanogaster, where it is involved in cell lineage differentiation. Notch signaling regulates the maintenance and differentiation of intestinal stem cells or ISCs by controlling the expression of atonal homolog 1 or Atoh1. Atoh1 directs cells to differentiate into secretory cells.
Direct cell-to-cell contact is needed for the activation of Notch signaling. The signal is initiated when a notch ligand binds to a receptor on an adjacent cell, also...
Direct cell-to-cell contact is needed for the activation of Notch signaling. The signal is initiated when a notch ligand binds to a receptor on an adjacent cell, also...
