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Related Concept Videos

Spermatogenesis01:41

Spermatogenesis

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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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Spermatogenesis01:22

Spermatogenesis

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Spermatogenesis is a complex process that involves the development of sperm cells from undifferentiated stem cells in the seminiferous tubules of the testes. The process is essential for the production of mature and functional sperm cells that are capable of fertilizing an egg.
The process of spermatogenesis can be divided into mitosis, meiosis, and spermiogenesis. During mitosis, the spermatogonia or stem cells divide to produce two identical daughter cells, type A and B spermatogonia. Type-A...
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Meiosis I01:49

Meiosis I

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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...
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Meiosis I03:09

Meiosis I

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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...
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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.
Near the gonadal ridges, two duct systems are present: the mesonephric ducts (Wolffian ducts) and paramesonephric ducts (Müllerian ducts). These ducts form the basis for the...
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Fertilization01:38

Fertilization

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During fertilization, an egg and sperm cell fuse to create a new diploid structure. In humans, the process occurs once the egg has been released from the ovary, and travels into the fallopian tubes. The process requires several key steps: 1) sperm present in the genital tract must locate the egg; 2) once there, sperm need to release enzymes to help them burrow through the protective zona pellucida of the egg; and 3) the membranes of a single sperm cell and egg must fuse, with the sperm...
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Generation of Human Primordial Germ Cell-like Cells at the Surface of Embryoid Bodies from Primed-pluripotency Induced Pluripotent Stem Cells
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Mechanisms of human germ cell development.

Mitinori Saitou1,2,3, Masahiro Nagano4,5,6, Ken Mizuta4,5

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Human germ cell development is crucial for reproduction and preventing diseases like infertility. Understanding these processes, from specification to epigenetic reprogramming, aids in developing new fertility treatments.

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Area of Science:

  • Reproductive Biology
  • Developmental Biology
  • Genetics

Background:

  • Human germ cells are essential for reproduction, heredity, and genetic diversity.
  • Anomalies in germ cells can lead to critical diseases, notably infertility.
  • Recent advances in genomics and stem cell research have significantly improved understanding of germ cell development.

Purpose of the Study:

  • To provide an integrated review of human embryonic and fetal germ cell development.
  • To elucidate the mechanisms of germ cell specification, epigenetic reprogramming, and sex-specific development.
  • To highlight the potential of in vitro gametogenesis for medical applications.

Main Methods:

  • Review of in vivo and in vitro studies on human germ cell development.
  • Analysis of recent advancements in genomics and stem cell research.
  • Integration of evidence on germ cell specification, epigenetic reprogramming, and sex determination.

Main Results:

  • Detailed overview of germ cell specification and differentiation during embryonic and fetal stages.
  • Elucidation of conserved and distinctive properties of human germ cell development.
  • Identification of key mechanisms including epigenetic reprogramming and sex-specific pathways.

Conclusions:

  • Understanding human germ cell development is key to its in vitro reconstitution.
  • In vitro reconstitution of germ cells can form the basis for novel medical strategies.
  • This knowledge is vital for preventing and treating germ cell-related diseases, including infertility.