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Related Concept Videos

Epigenetic Regulation01:46

Epigenetic Regulation

Epigenetic mechanisms play an essential role in healthy development. Conversely, precisely regulated epigenetic mechanisms are disrupted in diseases like cancer.
Histone Modification02:32

Histone Modification

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.
Acetylation
The enzyme histone acetyltransferase adds acetyl group to the histones. Another enzyme, histone deacetylase,...
Epigenetic Regulation01:46

Epigenetic Regulation

Epigenetic mechanisms play an essential role in healthy development. Conversely, precisely regulated epigenetic mechanisms are disrupted in diseases like cancer.
Genomic Imprinting and Inheritance02:30

Genomic Imprinting and Inheritance

Diploid organisms inherit genetic material through chromosomes from both parents. Copies of the same gene are known as alleles. In most cases, both alleles are simultaneously expressed and allow various cellular processes to function optimally. If one of the alleles is missing or mutated, the expression of the other allele can compensate; however, this is not true for all genes.
The expression of some genes depends on which parent passed the gene to the offspring, through a phenomenon known as...
Epigenetic Regulation01:37

Epigenetic Regulation

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.
X-chromosome...
Histone Modification02:32

Histone Modification

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.
Acetylation
The enzyme histone acetyltransferase adds acetyl group to the histones. Another enzyme, histone deacetylase,...

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Related Experiment Video

Updated: Jul 1, 2026

Correlating Gene-specific DNA Methylation Changes with Expression and Transcriptional Activity of Astrocytic KCNJ10 (Kir4.1)
11:19

Correlating Gene-specific DNA Methylation Changes with Expression and Transcriptional Activity of Astrocytic KCNJ10 (Kir4.1)

Published on: September 26, 2015

DNA methylation and gene activity.

H Cedar1

  • 1Department of Cellular Biochemistry, Hebrew University, Jerusalem, Israel.

Cell
|April 8, 1988
PubMed
Summary
This summary is machine-generated.

DNA methylation represses tissue-specific genes by altering chromatin structure, making them inaccessible. Gene activation involves demethylation, allowing constitutive expression.

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Last Updated: Jul 1, 2026

Correlating Gene-specific DNA Methylation Changes with Expression and Transcriptional Activity of Astrocytic KCNJ10 (Kir4.1)
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Continuous Fluorescence-Based Endonuclease-Coupled DNA Methylation Assay to Screen for DNA Methyltransferase Inhibitors
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Area of Science:

  • Molecular Biology
  • Epigenetics
  • Gene Regulation

Background:

  • DNA methylation is a key epigenetic mechanism.
  • Tissue-specific gene expression is crucial for cellular differentiation.
  • Understanding gene repression mechanisms is vital for developmental biology.

Purpose of the Study:

  • To elucidate the role of DNA methylation in regulating tissue-specific gene expression in vivo.
  • To propose a model for how DNA methylation contributes to transcriptional repression.
  • To explain the process of gene activation involving DNA demethylation.

Main Methods:

  • The study is based on experimental findings (details not provided in the abstract).
  • The model integrates concepts of chromatin structure and gene accessibility.
  • Comparative analysis of tissue-specific and house-keeping genes is implied.

Main Results:

  • Most tissue-specific genes are methylated, leading to transcriptional inactivity.
  • Methylation creates a chromatin state that blocks gene access.
  • House-keeping genes are generally not affected by this methylation-induced repression.
  • Gene activation initiates with recognition of methylated genes, followed by demethylation.
  • Demethylated genes adopt a stable, active chromatin structure.

Conclusions:

  • DNA methylation provides a general mechanism for transcriptional repression, independent of regulatory factors.
  • This mechanism allows for differential gene expression, enabling cell-type specificity.
  • Demethylation is essential for the stable activation and maintenance of tissue-specific genes.