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Related Concept Videos

Histone Modification02:32

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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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The histone proteins in the nucleosomes are post-translationally modified (PTM) to increase or decrease access to DNA. The commonly observed PTMs are methylation, acetylation, phosphorylation, and ubiquitination of lysine amino acids in the histone H3 tail region. These histone modifications have specific meaning for the cell. Hence, they are called "histone code". The protein complex involved in histone modification is termed as "reader-writer" complex.
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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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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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Nucleosomes are the basic units of chromatin compaction. Each nucleosome consists of the DNA bound tightly around a histone core, which makes the DNA inaccessible to DNA binding proteins such as DNA polymerase and RNA polymerase. Hence, the fundamental problem is to ensure access to DNA when appropriate, despite the compact and protective chromatin structure.
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Updated: Sep 12, 2025

Immunostaining for DNA Modifications: Computational Analysis of Confocal Images
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IMPACTS OF DNA METHYLATION ON H2A.Z DEPOSITION AND NUCLEOSOME STABILITY.

Rochelle M Shih1, Yasuhiro Arimura1,2, Hide A Konishi1

  • 1Laboratory of Chromosome and Cell Biology, The Rockefeller University, New York, New York, 10065, USA.

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Summary

DNA methylation and histone variant H2A.Z occupy distinct genomic regions. DNA methylation destabilizes H2A.Z nucleosomes, while the SRCAP complex mediates H2A.Z

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Area of Science:

  • * Epigenetics and Chromatin Biology
  • * Molecular mechanisms of DNA methylation and histone variant regulation

Background:

  • * DNA methylation and the histone variant H2A.Z are typically found in mutually exclusive genomic regions in eukaryotes.
  • * The molecular basis for this antagonism and the role of DNA methylation in H2A.Z nucleosome dynamics remain unclear.

Purpose of the Study:

  • * To investigate the impact of DNA methylation on the stability of H2A.Z nucleosomes.
  • * To elucidate the role of DNA methylation in chaperone-mediated H2A.Z deposition.
  • * To understand the mechanism establishing the antagonistic relationship between H2A.Z and DNA methylation.

Main Methods:

  • * Cryo-electron microscopy (Cryo-EM) to analyze nucleosome structure.
  • * Endonuclease accessibility assays to assess DNA accessibility within nucleosomes.
  • * Nucleosome assembly experiments using synthetic DNA and *Xenopus* egg extracts.

Main Results:

  • * H2A.Z nucleosomes containing methylated DNA exhibit increased openness and accessibility compared to unmethylated counterparts.
  • * In *Xenopus laevis*, H2A.Z shows a preference for unmethylated DNA in both cell lines and sperm pronuclei.
  • * DNA methylation suppresses the recruitment of the SRCAP complex, the primary H2A.Z deposition chaperone, to DNA.
  • * The preference of H2A.Z for unmethylated DNA is dependent on the SRCAP complex.

Conclusions:

  • * The SRCAP complex is a key determinant for H2A.Z enrichment on unmethylated DNA.
  • * DNA methylation destabilizes DNA binding within H2A.Z-containing nucleosomes.
  • * This study proposes a mechanism for the antagonistic relationship between H2A.Z and DNA methylation mediated by the SRCAP complex.