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Related Concept Videos

Epigenetic Regulation01:37

Epigenetic Regulation

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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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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...
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The histone proteins have a flexible N-terminal tail extending out from the nucleosome. These histone tails are often subjected to post-translational modifications such as acetylation, methylation, phosphorylation, and ubiquitination. Particular combinations of these modifications form “histone codes” that influence the chromatin folding and tissue-specific gene expression.
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Epigenetics: Beyond Chromatin Modifications and Complex Genetic Regulation.

Steven R Eichten1, Robert J Schmitz2, Nathan M Springer2

  • 1Microbial and Plant Genomics Institute, Department of Plant Biology, University of Minnesota, St. Paul, Minnesota 55108 (S.R.E., N.M.S.); andDepartment of Genetics, University of Georgia, Athens, Georgia 30602 (R.J.S.).

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Chromatin modifications and epigenetics influence plant development and adaptation. Understanding their distinct roles in heritable gene regulation is key to deciphering plant responses.

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Area of Science:

  • Plant Biology
  • Molecular Biology
  • Genetics

Background:

  • Chromatin modifications and epigenetics are crucial for plant processes like development and environmental responses.
  • Epigenetics involves heritable gene expression states independent of DNA sequence changes.
  • Distinguishing between chromatin modifications and epigenetics is essential for clarity.

Approach:

  • Defining epigenetics by heritability and independence from DNA sequence changes.
  • Analyzing the relationship between chromatin changes and heritable epigenetic states.
  • Highlighting plant examples where chromatin modifications and epigenetics are impactful.

Key Points:

  • Chromatin modifications are biochemical alterations to chromatin structure.
  • Epigenetics specifically refers to heritable gene expression patterns.
  • Not all chromatin changes are epigenetic; heritability is the defining factor.
  • Careful terminology separates mechanisms from inheritance patterns.

Conclusions:

  • Precise definitions of chromatin modifications and epigenetics enhance understanding of plant gene regulation.
  • This distinction clarifies the roles of these processes in plant adaptation and development.
  • Further research can leverage these definitions to explore complex plant traits.