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Related Concept Videos

Forced Transdifferentiation01:28

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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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Other than maintaining genome stability via DNA repair, homologous recombination plays an important role in diversifying the genome. In fact, the recombination of sequences forms the molecular basis of genomic evolution. Random and non-random permutations of genomic sequences create a library of new amalgamated sequences. These newly formed genomes can determine the fitness and survival of cells. In bacteria, homologous and non-homologous types of recombination lead to the evolution of new...
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Epigenetic changes alter the physical structure of the DNA without changing the genetic sequence and often regulate whether genes are turned on or off. This regulation ensures that each cell produces only proteins necessary for its function. For example, proteins that promote bone growth are not produced in muscle cells. Epigenetic mechanisms play an essential role in healthy development. Conversely, precisely regulated epigenetic mechanisms are disrupted in diseases like cancer.
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Related Experiment Video

Updated: Apr 16, 2026

Epigenetic Conversion as a Safe and Simple Method to Obtain Insulin-secreting Cells from Adult Skin Fibroblasts
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Phenotype switching through epigenetic conversion.

T A L Brevini1, G Pennarossa1, S Maffei1

  • 1Department of Health, Animal Science and Food Safety, UniStem, Laboratory of Biomedical Embryology, Università degli Studi di Milano, Via Celoria 10, 20133 Milan, Italy.

Reproduction, Fertility, and Development
|March 6, 2015
PubMed
Summary
This summary is machine-generated.

Epigenetic conversion offers a safe method to generate therapeutic cells by increasing cell plasticity with 5-aza-cytidine. This approach avoids gene transfection, overcoming limitations of current regenerative medicine strategies.

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Area of Science:

  • Regenerative Medicine
  • Cell Biology
  • Epigenetics

Background:

  • Embryonic pluripotent stem cells offer potential but carry risks like neoplastic transformation.
  • Adult stem cells are safer but have limited proliferation and differentiation capabilities.
  • Induced pluripotent stem (iPS) cells are promising but often require transgene vectors, limiting therapeutic use.

Purpose of the Study:

  • To develop a safe and direct method for cell conversion in regenerative medicine.
  • To overcome the limitations associated with transgene vectors in iPS cell generation and transdifferentiation.

Main Methods:

  • Utilized epigenetic modifiers, specifically 5-aza-cytidine, to enhance cell plasticity.
  • Exploited a transient window of epigenetic instability to redirect cell lineage.
  • Developed a strategy termed 'epigenetic conversion' for direct cell type transformation.

Main Results:

  • Successfully converted adult mature cells into different cell types.
  • Demonstrated that epigenetic conversion is a simple, direct, and safe method.
  • Achieved cell therapy generation without gene transfection or inducing a stable pluripotent state.

Conclusions:

  • Epigenetic conversion represents a novel and safe strategy for generating therapeutic cells.
  • This method bypasses the need for gene transfection, addressing safety concerns in regenerative medicine.
  • The approach enhances cell plasticity, enabling direct lineage redirection for therapeutic applications.