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Related Concept Videos

Cellular Differentiation00:57

Cellular Differentiation

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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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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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Determination01:51

Determination

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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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iPS Cell Differentiation01:22

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The ability of induced pluripotent stem cells or iPSCs to differentiate into most body cell types has stimulated repair and regenerative medicine research over the past few decades. iPSC-derived blood cells, hepatocytes, beta islet cells, cardiomyocytes, neurons, and other cell types can repair injuries or regenerate damaged tissue in diseases such as diabetes and neurodegenerative disorders.
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Stem Cell Culture01:17

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Stem cell research aims to find ways to use stem cells to regenerate and repair cellular damage. Over time, most adult cells undergo the wear and tear of aging and lose their ability to divide and repair themselves. Stem cells do not display a particular morphology or function. Adult stem cells, which exist as a small subset of cells in most tissues, keep dividing and can differentiate into a number of specialized cells generally formed by that tissue. These cells enable the body to renew and...
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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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Differentiation of Mouse Embryonic Stem Cells into Cortical Interneuron Precursors
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Evolution of irreversible differentiation under stage-dependent cell differentiation.

Yuanxiao Gao1,2, Yuriy Pichugin3,4, Arne Traulsen3

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Cell differentiation, crucial for multicellular life, evolves dynamically. Irreversible differentiation is favored in small organisms, particularly germ cell differentiation, influencing evolutionary patterns.

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Area of Science:

  • Evolutionary biology
  • Developmental biology
  • Theoretical biology

Background:

  • Cell specialization is fundamental to complex multicellular organisms.
  • Cell differentiation allows for diverse cell types with distinct functions.
  • Understanding the evolution of differentiation patterns is key to complex life.

Purpose of the Study:

  • To investigate how dynamic, stage-dependent cell differentiation affects the evolution of optimal differentiation patterns.
  • To model cell differentiation trajectories with varying probabilities.
  • To explore the role of natural selection in the evolution of cell specialization.

Main Methods:

  • Development of a theoretical model for cell differentiation.
  • Simulation of cell division trajectories with random differentiation into germ or soma cell types.
  • Comparison of differentiation patterns under dynamic versus constant (stage-independent) conditions.

Main Results:

  • Irreversible differentiation is favored in small organisms under dynamic differentiation compared to constant differentiation.
  • Irreversible differentiation of germ cells (loss of soma production ability) is a common irreversible pattern.
  • Only substantial variations in differentiation probabilities prevent irreversible trajectories from being optimal.

Conclusions:

  • Dynamic, stage-dependent cell differentiation significantly impacts the evolution of multicellularity.
  • Irreversible differentiation, especially in germ lines, represents an evolutionarily stable strategy in certain contexts.
  • The study provides insights into the evolutionary pressures shaping cell fate decisions in developing organisms.