レチノイドシグナル伝達は,マウスにおける生殖細胞の運命を決定する
Josephine Bowles1, Deon Knight, Christopher Smith
1Division of Genetics and Developmental Biology, Institute for Molecular Bioscience, University of Queensland, Brisbane, QLD 4072, Australia.
まとめ
レチノ酸はマウスの生殖細胞の運命を左右する. 高いレベルは卵巣におけるオオゲネシスを促進し,卵巣内の分解は精子生成を保証する. このレチノイドの調節は,性腺発達の鍵である.
科学分野:
- 発達生物学 発達生物学とは
- 生殖生物学 生殖生物学
- 分子内分泌学は分子内分泌学である.
背景:
- マウスの胚における生殖細胞の発達により,卵細胞または精子細胞に微分化することができる.
- この性的な運命の決定を左右する特定の分子線索は,ほとんど特定されていないままです.
研究 の 目的:
- ネズミの胚における生殖細胞の運命決定を制御する分子機構を特定する.
- オオゲネシスと精子生成の決定におけるレチノイドの役割を明らかにする.
主な方法:
- 胎児の性腺における遺伝子発現パターンの分析.
- 外因的なレチノ酸の効果を調査する.
- Cyp26b1-ノックアウトマウスモデルを使用して,レチノイド代謝を研究する.
主要な成果:
- メソネフロイによって生成されるレチノ酸は,卵巣の生殖細胞をメオシスに入り,オオゲネシスを開始するように誘導します.
- 酵素CYP26B1は胎児の丸におけるレチノ酸を分解し,メオシスを阻害し,精子生成を促進する.
- Cyp26b1-ノックアウトマウスの胚は,卵巣の発達を模倣して,早熟した生殖細胞の微分化を示します.
結論:
- レチノイドレベルを正確に調節することは,胎児の性腺発達の過程で生殖細胞の運命を特定するための重要な分子制御メカニズムです.
- レチノイド信号伝達経路は,哺乳類の生殖細胞の性差別化において重要な役割を果たします.
関連する概念動画
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...
The Retinoblastoma Gene
Tumor suppressor genes are normal genes that can slow down cell division, repair DNA mistakes, or program the cells for apoptosis in case of irreparable damage. Hence, they play an essential role in preventing the proliferation of damaged cells.
The first-ever tumor suppressor gene called Rb was identified in retinoblastoma - a rare eye tumor in children. In inherited forms of the disease, a child inherits one defective copy of the Rb gene, which predisposes them to retinoblastoma. However,...
The first-ever tumor suppressor gene called Rb was identified in retinoblastoma - a rare eye tumor in children. In inherited forms of the disease, a child inherits one defective copy of the Rb gene, which predisposes them to retinoblastoma. However,...
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...


