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Updated: Jun 27, 2026

14:01
Isolation and Derivation of Mouse Embryonic Germinal Cells
Published on: October 22, 2009
生殖細胞の内在的および外在的要因が,マウス胚における媒介的開始を統制する
Yanfeng Lin1, Mark E Gill, Jana Koubova
1Howard Hughes Medical Institute, Whitehead Institute, and Department of Biology, Massachusetts Institute of Technology, 9 Cambridge Center, Cambridge, MA 02142, USA.
まとめ
レチノ酸 (RA) は,哺乳類の生殖細胞における微分化の開始を誘導する. RNA結合タンパク質DAZLは,重要な内在的因子として作用し,生殖細胞が特定の発達窓の間にRAに反応することを可能にします.
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
- 分子遺伝学 分子遺伝学
背景:
- レチノ酸 (RA) は,哺乳類の生殖細胞における微分化の開始のための重要な外部信号である.
- RAの広範な作用は,メオティック発症における細胞型および時間的特異性に関する追加の要因を必要とします.
- 酵母微生物分裂は,外在的および内在的要因が協力して微生物分裂への入り口を調節するモデルとして機能します.
研究 の 目的:
- ネズミの胚におけるメオティック開始の調節における外部因子と内在因子の組み合わせられた役割を調査する.
- 細胞型および時間的な特異性を付与する内在的要因を特定するために,RA誘発のメオティック開始.
- 発芽細胞がRAに反応する能力を獲得するメカニズムを解明する.
主な方法:
- 開発中のマウスの生殖細胞における遺伝子発現パターンの分析.
- 胚芽細胞の発達におけるRNA結合タンパク質DAZLの機能を調査する.
- RAシグナル伝達とDAZL発現の相互作用を研究し,メオティックエントリーを制御する.
主要な成果:
- 外在的 (RA) 及び内在的要因は,マウス胚におけるメオティック開始を調節するために協力する.
- 移住後の生殖細胞で発現するマウスRNA結合タンパク質DAZLは,重要な内在的因子として特定されています.
- DAZLは,生殖細胞が特定の発達ウィンドウ内でRAに反応してメオシスを開始することを可能にします.
- XXとXYの両方の生殖細胞は,この期間中にRAをメオシス誘発信号として解釈する能力を獲得します.
結論:
- 哺乳類の生殖細胞におけるメイオチス発現は,外部要因と内在要因の両方を含む,厳格に規制されたプロセスである.
- DAZLは,RAに対する生殖細胞の反応を媒介する上で重要な役割を果たし,メオシスへの適時かつ特異的な入り口を確保します.
- この調整された調節は,男性と女性の胚の両方の生殖細胞発達の適切な進行を保証します.
関連する概念動画
Meiosis vs. Mitosis
Cell division is necessary for growth and reproduction in organisms. Mitosis aids cell growth and development by dividing somatic cells. In contrast, meiosis causes the division of germ cells and plays an essential role in sexual reproduction. Due to their unique functional requirements, mitosis and meiosis differ from each other in multiple aspects.
Before the start of mitosis and meiosis I, the cell synthesizes DNA, resulting in two homologous copies of each chromosome. DNA synthesis is...
Before the start of mitosis and meiosis I, the cell synthesizes DNA, resulting in two homologous copies of each chromosome. DNA synthesis is...
Meiosis I
Meiosis is the division of a diploid cell into haploid cells forming sperm and eggs in animals through differentiation. Meiosis I is the first stage of meiosis, where the genetic recombination of homologous chromosomes and the reduction of the ploidy level by half occurs.
Prophase I is the most extended and complex step of meiosis I characterized by synapsis, chromosome pairing, and recombination of the homologous chromosomes. This process is facilitated by a proteinaceous structure called the...
Prophase I is the most extended and complex step of meiosis I characterized by synapsis, chromosome pairing, and recombination of the homologous chromosomes. This process is facilitated by a proteinaceous structure called the...
Meiosis I
Meiosis is a carefully orchestrated set of cell divisions, the goal of which—in humans—is to produce haploid sperm or eggs, each containing half the number of chromosomes present in somatic cells elsewhere in the body. Meiosis I is the first such division, and involves several key steps, among them: condensation of replicated chromosomes in diploid cells; the pairing of homologous chromosomes and their exchange of information; and finally, the separation of homologous chromosomes by a...
Meiosis II
Meiosis II is the second and final stage of meiosis. It relies on the haploid cells produced during meiosis I, each of which contain only 23 chromosomes—one from each homologous initial pair. Importantly, each chromosome in these cells is composed of two joined copies, and when these cells enter meiosis II, the goal is to separate such sister chromatids using the same microtubule-based network employed in other division processes. The result of meiosis II is two haploid cells, each containing...
Meiosis II
Meiosis II entails cell division and segregation of the sister chromatids, resulting in the production of four unique haploid gametes. The steps for meiosis II are similar to mitosis, except that meiosis II occurs in haploid cells, whereas mitosis occurs in diploid cells.
The timing and cell division patterns of meiosis differ between males and females. In male meiosis, the centrosomes are part of the formation of the meiotic spindle. However, in oocytes, including that of humans, Drosophila,...
The timing and cell division patterns of meiosis differ between males and females. In male meiosis, the centrosomes are part of the formation of the meiotic spindle. However, in oocytes, including that of humans, Drosophila,...
Spermatogenesis
Spermatogenesis is the process by which haploid sperm cells are produced in the male testes. It starts with stem cells located close to the outer rim of seminiferous tubules. These spermatogonial stem cells divide asymmetrically to give rise to additional stem cells (meaning that these structures “self-renew”), as well as sperm progenitors, called spermatocytes. Importantly, this method of asymmetric mitotic division maintains a population of spermatogonial stem cells in the male reproductive...

