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Epigenetic Regulation01:46

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Epigenetic mechanisms play an essential role in healthy development. Conversely, precisely regulated epigenetic mechanisms are disrupted in diseases like cancer.
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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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CpG Islands Shape the Epigenome Landscape.

Christophe Papin1, Stéphanie Le Gras1, Abdulkhaleg Ibrahim2

  • 1Institut de Génétique et Biologie Moléculaire et Cellulaire (IGBMC), UdS, CNRS, INSERM, Equipe labellisée Ligue contre le Cancer, 1 rue Laurent Fries, B.P. 10142,67404 Illkirch Cedex, France.

Journal of Molecular Biology
|October 3, 2020
PubMed
Summary
This summary is machine-generated.

CpG density and DNA sequence influence epigenetic marks and nucleosome positioning at gene promoters. Histone variant H2A.Z positioning is determined by CpG island boundaries, not gene activity.

Keywords:
epigenetic modificationshistone variant H2A.Znucleosome positioningpromoter chromatin organizationtranscription

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Area of Science:

  • Molecular Biology
  • Epigenetics
  • Genomics

Background:

  • Epigenetic modifications and nucleosome positioning are crucial for gene expression regulation.
  • The precise mechanisms establishing these patterns around promoters remain unclear.

Purpose of the Study:

  • To investigate the interplay between epigenetic marks, nucleosome positioning, and promoter characteristics.
  • To elucidate the role of DNA sequence and CpG density in shaping promoter chromatin architecture.

Main Methods:

  • Genome-wide experimental approaches.
  • Novel bioinformatic analysis.

Main Results:

  • A strong correlation exists between CpG density, promoter activity, and histone mark accumulation.
  • CpG island boundaries define epigenetically modified promoter regions.
  • CpG-rich promoters are influenced by histone modifications and variants, while CpG-poor promoters are regulated by DNA methylation.
  • H2A.Z positioning is dictated by CpG island boundaries, independent of transcriptional activity.
  • H2A.Z depletion does not affect gene expression in mouse embryonic fibroblasts.

Conclusions:

  • DNA sequence and promoter CpG density are primary determinants of promoter chromatin structure.
  • Transcriptional activity plays a lesser role in establishing promoter chromatin architecture.