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Related Concept Videos

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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.
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Transdifferentiation, also known as lineage reprogramming, was first discovered by Selman and Kafatos in 1974 in silkmoths. They observed that the moths’ cuticle-producing cells transformed into salt-producing cells. Many such cases of natural transdifferentiation occur in organisms. In humans, pancreatic alpha cells can become beta cells. In newts, the loss of the eye’s lens causes the pigmented epithelial cells to transdifferentiate into the lens cells.
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Related Experiment Video

Updated: Apr 16, 2026

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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Human germline differentiation charts a new course.

Di Chen1, Amander T Clark1

  • 1Department of Molecular Cell and Developmental Biology, Eli and Edythe Broad Center of Regenerative Medicine and Stem Cell Research, University of California Los Angeles, Los Angeles, CA, USA.

The EMBO Journal
|March 20, 2015
PubMed
Summary

Researchers developed efficient methods to create human germline cells from pluripotent stem cells in vitro. This breakthrough aids in studying reproductive health and identifying environmental impacts on gametogenesis.

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Area of Science:

  • Reproductive Biology
  • Stem Cell Research
  • Developmental Biology

Background:

  • Understanding human reproduction requires in vitro methods to differentiate pluripotent stem cells into germline cells (gametes).
  • Such systems are crucial for studying germline development and screening environmental agents affecting gametogenesis.

Purpose of the Study:

  • To present complementary approaches for efficiently generating human germline cells from pluripotent stem cells.
  • To highlight the importance of human cell-based models in reproductive health research.

Main Methods:

  • Utilized complementary approaches to differentiate human pluripotent stem cells into germline cells.
  • Focused on achieving unprecedented efficiency in generating these cells in vitro.

Main Results:

  • Demonstrated successful generation of human germline cells from pluripotent stem cells with high efficiency.
  • Highlighted the power and limitations of translating mouse-based differentiation pathways to human systems.

Conclusions:

  • New methods enable efficient in vitro generation of human germline cells.
  • Human cell-based models are essential for studying reproductive health and gametogenesis, revealing limitations of cross-species pathway extrapolation.