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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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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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Bet-hedging and epigenetic inheritance in bacterial cell development.

Jan-Willem Veening1, Eric J Stewart, Thomas W Berngruber

  • 1Molecular Genetics Group, Groningen Biomolecular Sciences and Biotechnology Institute, and Theoretical Biology Group, Centre for Ecological and Evolutionary Studies, University of Groningen, 9751 NN, Haren, The Netherlands.

Proceedings of the National Academy of Sciences of the United States of America
|March 8, 2008
PubMed
Summary

Bacillus subtilis employs bet-hedging for sporulation, with ancestral cell state, not age, influencing differentiation. This epigenetic memory aids development in bacterial communities.

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Area of Science:

  • Microbiology
  • Cell Biology
  • Developmental Biology

Background:

  • Bacillus subtilis undergoes sporulation under nutrient limitation, a bistable process where only a fraction of cells differentiate into endospores.
  • The decision-making mechanism for sporulation in individual cells remains poorly understood.
  • Understanding cellular fate decisions is crucial for bacterial development and survival strategies.

Purpose of the Study:

  • To investigate the factors influencing the sporulation decision in individual Bacillus subtilis cells.
  • To determine the role of cell history, ancestry, and age in the differentiation process.
  • To elucidate the underlying mechanisms of epigenetic inheritance in bacterial development.

Main Methods:

  • Time-lapse microscopy was used to track the growth, division, and differentiation of individual Bacillus subtilis cells.
  • Cellular lineage and physiological states were monitored over multiple generations.
  • Genetic and molecular analyses were employed to investigate the sporulation phosphorelay network.

Main Results:

  • Bacillus subtilis utilizes a bet-hedging strategy, balancing sporulation with continued growth using alternative metabolites.
  • Cellular age does not influence the sporulation decision; however, the ancestor's physiological state significantly impacts differentiation.
  • Epigenetic inheritance, mediated by positive feedback in the sporulation phosphorelay, creates an intergenerational memory.
  • This memory mechanism influences cellular differentiation outcomes for at least two generations.

Conclusions:

  • The ancestral physiological state, not cell age, dictates Bacillus subtilis sporulation fate through epigenetic inheritance.
  • Positive feedback in the sporulation phosphorelay establishes a long-term intergenerational memory.
  • This epigenetic memory is vital for the coordinated development of complex bacterial multicellular structures like biofilms and fruiting bodies.