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Related Concept Videos

Epigenetic Regulation01:46

Epigenetic Regulation

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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 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.
X-chromosome...
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Genomic Imprinting and Inheritance02:30

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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.
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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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Among all the organelles in an animal cell, only mitochondria have their own independent genomes. Animal mitochondrial DNA is a double-stranded, closed-circular molecule with around 20,000 base pairs. Mitochondrial DNA is unique in that one of its two strands, the heavy, or H, -strand is guanine rich, whereas the complementary strand is cytosine rich and called the light, or L, -strand. Compared to nuclear DNA, mitochondrial DNA has a very low percentage of non-coding regions and is marked by...
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The extent of chromatin compaction can be studied by staining chromatin using specific DNA binding dyes. Under the microscope, the dense-compacted regions that take up more dye are called heterochromatin. Heterochromatin is further classified into two forms – constitutive heterochromatin and facultative heterochromatin.
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Related Experiment Video

Updated: Apr 30, 2026

Immunostaining for DNA Modifications: Computational Analysis of Confocal Images
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DNA methylation in mammals.

En Li1, Yi Zhang

  • 1China Novartis Institutes for BioMedical Research, Pudong New Area, Shanghai 201203, China.

Cold Spring Harbor Perspectives in Biology
|May 3, 2014
PubMed
Summary
This summary is machine-generated.

DNA methylation is a key epigenetic mechanism in mammals, regulating gene expression and cellular memory. Its dynamic control by DNA methyltransferases (DNMT) and TET enzymes is crucial for biological processes and preventing disease.

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Area of Science:

  • Epigenetics and Molecular Biology
  • Genomics and Gene Regulation

Background:

  • DNA methylation is a fundamental epigenetic modification in mammals.
  • It plays critical roles in gene silencing, genomic imprinting, and X-chromosome inactivation.

Purpose of the Study:

  • To elucidate the role of DNA methylation as a cellular memory system.
  • To describe the dynamic regulation of DNA methylation by DNMT and TET enzymes.
  • To discuss the interplay of DNA methylation with histone modifications in gene expression and its implication in human diseases.

Main Methods:

  • Review of established literature on DNA methylation dynamics.
  • Analysis of the enzymatic mechanisms of DNMT and TET enzymes.
  • Integration of findings on epigenetic cross-talk and disease relevance.

Main Results:

  • DNA methylation acts as a stable yet dynamic cellular memory.
  • DNMT and TET enzymes orchestrate methylation patterns.
  • Interplay with histone modifications fine-tunes gene expression.

Conclusions:

  • DNA methylation is central to cellular identity and function.
  • Dysregulation contributes to human diseases.
  • Future research will focus on novel regulatory mechanisms and therapeutic interventions.