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相关概念视频

Development of the Sexual Organs in the Embryo and Fetus01:15

Development of the Sexual Organs in the Embryo and Fetus

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Development of the reproductive organs in an embryo starts from a bipotential state. This means the early embryo can develop either male or female reproductive organs. The formation of these organs begins with the growth of gonadal ridges that arise from the intermediate mesoderm during the fifth week of development.
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The gonads, namely the testes in males and the ovaries in females, are pivotal in producing gonadal hormones that orchestrate the intricate processes of sexual development and reproduction.
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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...
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The development of all multicellular organisms starts with the fusion of haploid cells called sperm and egg to form a diploid zygote. A zygote is a totipotent cell that can develop into a complete organism. The zygote undergoes cell division or cleavage to form an 8-cell mass. Until this stage, the cells are spherical, loosely attached, and remain totipotent. Totipotent cells are capable of developing both the embryonic and the extraembryonic tissues. However, as they continue to divide, they...
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Gastrulation establishes the three primary tissues of an embryo: the ectoderm, mesoderm, and endoderm. This developmental process relies on a series of intricate cellular movements, which in humans transforms a flat, “bilaminar disc” composed of two cell sheets into a three-tiered structure. In the resulting embryo, the endoderm serves as the bottom layer, and stacked directly above it is the intermediate mesoderm, and then the uppermost ectoderm. Respectively, these tissue strata...
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In human women, oogenesis produces one mature egg cell or ovum for every precursor cell that enters meiosis. This process differs in two unique ways from the equivalent procedure of spermatogenesis in males. First, meiotic divisions during oogenesis are asymmetric, meaning that a large oocyte (containing most of the cytoplasm) and minor polar body are produced as a result of meiosis I, and again following meiosis II. Since only oocytes will go on to form embryos if fertilized, this unequal...
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人类生殖腺发育的单细胞路线图

Luz Garcia-Alonso1, Valentina Lorenzi1, Cecilia Icoresi Mazzeo1

  • 1Wellcome Sanger Institute, Cambridge, UK.

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概括

这项研究使用先进的单细胞和空间转录学来绘制人类性腺发育图. 它揭示了男性和女性淋巴发育的关键调节程序,有助于未来的不孕研究和体外模型.

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科学领域:

  • 发育生物学
  • 遗传学
  • 生殖医学

背景情况:

  • 人类性腺发育 (性腺发育) 对于生殖健康至关重要,但由于组织获取有限和模型系统的局限性,人们对其了解甚少.
  • 之前的研究面临着人类和小鼠之间特定物种差异的挑战, 阻碍了人类淋巴发育的研究.
  • 了解性腺生殖对于解决性腺疾病和不孕症至关重要.

研究的目的:

  • 创建一个全面的时空地图的人类性腺发育在第一和第二个三个月.
  • 识别控制生殖系和体细胞系发展的人类特异性调节程序.
  • 将人类淋巴发育与小鼠模型进行比较,以提取保存和特定物种的机制.

主要方法:

  • 用单细胞和空间转录组来分析人类的生殖腺.
  • 使用染色体可访问性测试和光显微镜进行详细的细胞分析.
  • 对同等发育阶段的小鼠模型进行了比较分析.

主要成果:

  • 在性别规范时定义的体细胞状态,包括双能早期支持群体.
  • 在男性中发现丸决定因子SRY和sPAX8s的上调.
  • 解决了女性细胞事件,详细介绍了颗粒细胞波及其在生殖细胞分化中的作用.
  • 人类胎儿丸巨细胞 (SIGLEC15+,TREM2+) 的特征及其在男性生殖腺发育中的信号作用.

结论:

  • 产生了人类和小鼠性腺区分的综合空间时间地图.
  • 发现人类特异性调节程序对生殖腺产生至关重要.
  • 这些发现为指导体外生殖和理解生殖障碍提供了基础.