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Related Concept Videos

Determination01:51

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...
Cellular Differentiation00:57

Cellular Differentiation

How does a complex organism such as a human develop from a single cell? It all starts from a single fertilized egg which gives rise to a vast array of cell types, such as nerve cells, muscle cells, and epithelial cells that characterize the adult? Throughout development and adulthood, cellular differentiation leads cells to assume their final morphology and physiology. Differentiation is the process by which unspecialized cells become specialized to carry out distinct functions.
A zygote is a...
Zygotic Development And Stem Cell Formation01:10

Zygotic Development And Stem Cell Formation

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...
Spermatogenesis01:41

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...
Spermatogenesis01:22

Spermatogenesis

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...
Maintenance of the ES Cell State01:14

Maintenance of the ES Cell State

The cells of the blastocyst inner cell mass only remain pluripotent for a short time. This state of pluripotency and self-renewal can be maintained in embryonic stem (ES) cell culture by adding specific chemicals or growth factors to ensure the cells can continue dividing and later differentiate into different cell types. In some cases, the cells are grown on a feeder layer of differentiated cells, which provides the growth factors and extracellular matrix components necessary for stem cell...

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Related Experiment Video

Updated: May 19, 2026

Generation of Human Primordial Germ Cell-like Cells at the Surface of Embryoid Bodies from Primed-pluripotency Induced Pluripotent Stem Cells
12:06

Generation of Human Primordial Germ Cell-like Cells at the Surface of Embryoid Bodies from Primed-pluripotency Induced Pluripotent Stem Cells

Published on: January 11, 2019

Germ cell specification.

Jennifer T Wang1, Geraldine Seydoux

  • 1Department of Molecular Biology and Genetics, Johns Hopkins School of Medicine, Baltimore, MD 21205, USA.

Advances in Experimental Medicine and Biology
|August 9, 2012
PubMed
Summary
This summary is machine-generated.

The germline in Caenorhabditis elegans originates from a single founder cell, P(4), which contains specialized germ plasm. This germ plasm uses unique mechanisms to ensure proper germ cell development and proliferation.

More Related Videos

Isolation and Derivation of Mouse Embryonic Germinal Cells
14:01

Isolation and Derivation of Mouse Embryonic Germinal Cells

Published on: October 22, 2009

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Last Updated: May 19, 2026

Generation of Human Primordial Germ Cell-like Cells at the Surface of Embryoid Bodies from Primed-pluripotency Induced Pluripotent Stem Cells
12:06

Generation of Human Primordial Germ Cell-like Cells at the Surface of Embryoid Bodies from Primed-pluripotency Induced Pluripotent Stem Cells

Published on: January 11, 2019

Isolation and Derivation of Mouse Embryonic Germinal Cells
14:01

Isolation and Derivation of Mouse Embryonic Germinal Cells

Published on: October 22, 2009

Area of Science:

  • Developmental Biology
  • Cell Biology
  • Genetics

Background:

  • The germline in Caenorhabditis elegans originates from the P(4) blastomere, a product of early asymmetric cell divisions.
  • P(4) contains a specialized cytoplasm known as germ plasm, rich in maternal factors.
  • The precise mechanisms by which germ plasm specifies germ cell fate are not fully understood.

Purpose of the Study:

  • To elucidate the molecular and cellular mechanisms by which germ plasm specifies germ cell fate in Caenorhabditis elegans.
  • To investigate how germ plasm prevents somatic development and promotes germline development.

Main Methods:

  • Analysis of asymmetric cell divisions and lineage segregation.
  • Investigation of mRNA transcription and translation regulation within the germline.
  • Characterization of chromatin states in germ cells.

Main Results:

  • Identified three key processes: inhibition of mRNA transcription, translational control of specific mRNAs like nos-2, and establishment of repressive chromatin.
  • Demonstrated that these processes ensure primordial germ cells (Z2 and Z3) develop correctly within the embryo.
  • Showed that these mechanisms support germ cell proliferation to generate approximately 2,000 germ cells by adulthood.

Conclusions:

  • Germ plasm employs a multi-faceted strategy involving transcriptional inhibition, translational regulation, and chromatin modification to specify and maintain germ cell identity.
  • These mechanisms are crucial for the proper development, migration, and proliferation of germ cells throughout the organism's life cycle.