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Epigenetic Regulation01:37

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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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Chromatin modification alters gene expression; therefore, scientists can add histone-modifying enzymes, histone variants, and chromatin remodeling complexes to somatic cells to aid reprogramming into pluripotent stem (iPS) cells.
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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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Determination of DNA Methylation of Imprinted Genes in Arabidopsis Endosperm
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Active DNA Demethylation in Plants.

Jara Teresa Parrilla-Doblas1,2,3, Teresa Roldán-Arjona4,5,6, Rafael R Ariza7,8,9

  • 1Maimónides Biomedical Research Institute of Córdoba (IMIBIC), 14071 Córdoba, Spain. b52padoj@uco.es.

International Journal of Molecular Sciences
|September 25, 2019
PubMed
Summary
This summary is machine-generated.

Plants utilize active DNA demethylation via DNA glycosylases and base excision repair (BER) to manage cytosine methylation (5-meC) levels. This process is crucial for regulating transposable elements and gene expression, impacting development and environmental responses.

Keywords:
5-methylcytosineDNA glycosylasesDNA methylationDNA repairabiotic stressbase excisionbiotic stressepigeneticsgene imprintingtransposons

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Area of Science:

  • Epigenetics
  • Molecular Biology
  • Plant Science

Background:

  • Cytosine methylation (5-meC) is a key epigenetic mark in eukaryotes, dynamically regulated by methylation and demethylation.
  • Plants possess a unique active DNA demethylation pathway involving DNA glycosylases and base excision repair (BER).

Purpose of the Study:

  • To elucidate the complex mechanisms and regulatory factors of plant BER-mediated DNA demethylation.
  • To understand the role of active DNA demethylation in maintaining DNA methylation homeostasis and its impact on genomic stability.

Main Methods:

  • The study focuses on the molecular mechanisms of DNA glycosylases and the BER pathway in plants.
  • Investigates the coordination between demethylation and methylation processes.

Main Results:

  • Active DNA demethylation prevents excessive methylation at transposable elements (TEs) and avoids methylation spread to genes.
  • This pathway is involved in transcriptional activation of TEs in gametophytes, contributing to transposon silencing in gametes and gene imprinting.
  • Plant 5-meC DNA glycosylases play roles in seed development, germination, fruit ripening, and stress responses.

Conclusions:

  • Plant active DNA demethylation is a sophisticated process essential for epigenetic regulation, genome integrity, and diverse physiological functions.
  • BER-mediated demethylation ensures flexible yet balanced DNA methylation patterns crucial for plant development and adaptation.