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Related Concept Videos

Lineage Commitment01:21

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Commitment is the  process whereby stem cells:
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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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Reprogramming alters the gene expression in somatic cells, transforming them into induced pluripotent stem (iPS) cells over several generations. Scientists can reprogram cells by introducing genes for four transcription factors—Oct4, Sox2, Klf4, and c-Myc (OSKM) by viral or non-viral methods. These factors are also known as Yamanaka factors after Shinya Yamanaka, who first generated iPS cells using mouse skin cells. Yamanaka was awarded the Nobel Prize in Physiology or Medicine in 2012...
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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...
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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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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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Area of Science:

  • Stem cell biology
  • Regenerative medicine
  • Epigenetics

Background:

  • Human induced pluripotent stem cells (iPSCs) offer significant potential for regenerative and personalized medicine.
  • Current understanding of iPSC reprogramming and the molecular identity of pluripotent stem cells (PSCs) is incomplete.
  • In vitro culture conditions for PSCs may not accurately reflect in vivo developmental processes.

Purpose of the Study:

  • To review and discuss existing theories on the identity of PSCs.
  • To explore the implications of different PSC identity models for the reprogramming field.
  • To speculate on future research directions for understanding PSC nature.

Main Methods:

  • Literature review of published theories on PSC identity.
  • Analysis of implications for reprogramming strategies.
  • Discussion of potential future research avenues.

Main Results:

  • Multiple theories exist regarding PSC identity, leading to variability in reprogramming and cell characterization.
  • The precise nature of PSCs and their in vitro behavior compared to in vivo development remains a critical unanswered question.
  • Resolving these fundamental questions is crucial for advancing regenerative medicine.

Conclusions:

  • Clarifying PSC identity is essential for advancing reprogramming technologies and regenerative medicine applications.
  • Further research is needed to reconcile in vitro PSC behavior with in vivo developmental processes.
  • A precise understanding of PSC nature will unlock new therapeutic possibilities.