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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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Chromatin modification alters gene expression; therefore, scientists can add histone-modifying enzymes, histone variants, and chromatin remodeling complexes to somatic cells to aid reprogramming into pluripotent stem (iPS) cells.
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Epigenetics is the study of inherited changes in a cell's phenotype without changing the DNA sequences. It provides a form of memory for the differential gene expression pattern to maintain cell lineage, position-effect variegation, dosage compensation, and maintenance of chromatin structures such as telomeres and centromeres. For example, the structure and location of the centromere on chromosomes are epigenetically inherited. Its functionality is not dictated or ensured by the underlying...
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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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Nuclear reprogramming is a process of transforming one cell type into an unrelated cell type by epigenetic changes that alter the cell’s original gene expression pattern. Such epigenetic changes force cells to express a different set of genes, which play a significant role in inducing transformation into other cell types. Nuclear reprogramming offers applications in reproductive cloning for livestock propagation and regenerative medicine — developing patient-specific cells for...
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Transdifferentiation occurs without resetting development-specific DNA methylation, a key determinant of

Ahmed Radwan1, Jason Eccleston2,3, Ofra Sabag1

  • 1Department of Developmental Biology and Cancer Research, Institute for Medical Research Israel-Canada, Hebrew University Medical School, Jerusalem 91120, Israel.

Proceedings of the National Academy of Sciences of the United States of America
|September 18, 2024
PubMed
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Somatic cell reprogramming via transdifferentiation often fails long-term due to persistent DNA methylation patterns. This study reveals epigenetic barriers to fully establishing new cell identities, crucial for complete reprogramming.

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Area of Science:

  • Cell Biology
  • Epigenetics
  • Developmental Biology

Background:

  • Factor-mediated transdifferentiation can convert cell types, but reprogrammed cells often lack stable identity.
  • Maintaining a new cell identity long-term is a significant challenge in reprogramming research.

Purpose of the Study:

  • To investigate the role of DNA methylation in the stability of transdifferentiated cells.
  • To understand the epigenetic limitations hindering complete somatic cell reprogramming.

Main Methods:

  • Developed an analytical approach to characterize DNA methylation changes during transdifferentiation.
  • Examined multiple in vitro and in vivo transdifferentiation models.

Main Results:

  • Transdifferentiated cells showed significant expression changes but retained original DNA methylation patterns.
  • DNA methylation patterns acted as a barrier, preventing complete epigenetic reprogramming.
  • Developmental constraints in regulatory sequences likely cause this epigenetic blockage.

Conclusions:

  • Incomplete reprogramming is linked to the inability to alter established DNA methylation patterns.
  • Understanding these epigenetic rules is essential for achieving stable and complete somatic cell reprogramming.