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Related Concept Videos

Cell Diversity01:13

Cell Diversity

The concept of a cell started with microscopic observations of dead cork tissue by Robert Hooke in 1665. Hooke coined the term "cell" based on the resemblance of the small subdivisions in the cork to the rooms that monks inhabited, called cells. About ten years later, Antonie van Leeuwenhoek became the first person to observe the living and moving cells under a microscope. In the century that followed, the theory that cells represented the basic unit of life developed.
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Methods of Nuclear Reprogramming01:24

Methods of Nuclear Reprogramming

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 injury repair.
Cellular Differentiation00:57

Cellular Differentiation

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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Cell Lines

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Inheritance of Chromatin Structures03:17

Inheritance of Chromatin Structures

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 DNA...
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Preformed cell structure and cell heredity.

Janine Beisson1

  • 1Centre de Génétique Moléculaire, Centre National de la Recherche Scientifique, Gif-sur-yvette, France. beisson@cgm.cnrs-gif.fr

Prion
|January 24, 2009
PubMed
Summary
This summary is machine-generated.

Cortical inheritance, or structural memory, in ciliates demonstrates non-DNA inheritance. This phenomenon, linked to basal body duplication, influences cytoskeleton assembly and cell polarity.

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Area of Science:

  • Cell Biology
  • Genetics
  • Biochemistry

Background:

  • Recalls "cortical inheritance" in ciliates (Paramecium, Tetrahymena) and the concept of "cytotaxis" or "structural memory."
  • Highlights the role of ciliary basal bodies and their duplication in these phenomena.
  • Connects these observations to current understanding of basal body/centriole duplication mechanisms.

Purpose of the Study:

  • Analyze the concept of cytotaxis and its implications for cell heredity.
  • Examine the relevance of cytotaxis to cytoskeleton organization and polarity transmission across diverse organisms.
  • Discuss the nature of non-DNA inheritance and its potential link to prions.

Main Methods:

  • Literature review and conceptual analysis.
  • Interpretation of experimental data from various organisms (ciliates, yeast, trypanosomes, mammalian cells, plants).
  • Discussion of protein-protein interactions and templating mechanisms.

Main Results:

  • Cortical inheritance and cytotaxis are crucial for organizing cellular structures like cytoskeleton and maintaining cell polarity.
  • These non-DNA inheritance mechanisms rely on protein templating and pre-existing protein complexes.
  • The study explores why documented cases are limited and relates these phenomena to prions.

Conclusions:

  • Cytotaxis represents a fundamental aspect of cell heredity, extending beyond DNA.
  • Understanding structural memory is key to comprehending diverse cellular processes and inheritance.
  • Further research is needed to elucidate the full scope and mechanisms of non-DNA inheritance and its prion-like aspects.