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Epigenetic Regulation

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...

Epigenetic Regulation

Epigenetic Regulation

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

Duplication of Chromatin Structure

Duplication of Chromatin Structure

The process of chromosome duplication during cell division requires genome-wide disruption and re-assembly of chromatin. The chromatin structure must be accurately inherited, reassembled, and maintained in the daughter cells to ensure lineage propagation.
The basic unit of the chromatin is the nucleosome, consisting of DNA wrapped around octameric histone proteins and short stretches of linker DNA separating individual nucleosomes. The histone proteins within the nucleosome have their...

Inheritance of Chromatin Structures

Inheritance of Chromatin Structures

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 DNA...

Position-effect Variegation

Position-effect Variegation

In 1928, a German botanist Emil Heitz observed the moss nuclei with a DNA binding dye. He observed that while some chromatin regions decondense and spread out in the interphase nucleus, others do not. He termed them euchromatin and heterochromatin, respectively. He proposed that the heterochromatin regions reflect a functionally inactive state of the genome. It was later confirmed that heterochromatin is transcriptionally repressed, and euchromatin is transcriptionally active chromatin.

Euchromatin

Euchromatin

The extent of chromatin compaction can be studied by staining chromatin using specific DNA binding dyes. Under the microscope, the dense-compacted regions take up more dye, appearing darker, while the less-compact areas take up less dye and appear lighter. Based on the compaction level, chromatins are classified into two primary forms – euchromatin and heterochromatin.
Euchromatin is the less dense region of the chromatin and stains lighter. Euchromatin contains histone H3 extensively...

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Related Experiment Video

Updated: Jun 13, 2026

Determination of DNA Methylation of Imprinted Genes in Arabidopsis Endosperm

Determination of DNA Methylation of Imprinted Genes in Arabidopsis Endosperm

Published on: January 28, 2011

Repeat elements and the Arabidopsis DNA methylation landscape.

F K Teixeira¹, V Colot

¹Institut de Biologie de l'Ecole Normale Supérieure, Centre National de la Recherche Scientifique UMR8197, Institut National de La Recherche Médicale U1024, Paris, France.

|May 13, 2010

Summary

Plants propagate DNA methylation across generations, unlike mammals. This review focuses on Arabidopsis, highlighting RNAi

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Last Updated: Jun 13, 2026

Determination of DNA Methylation of Imprinted Genes in Arabidopsis Endosperm

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Published on: January 28, 2011

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Published on: June 7, 2013

Area of Science:

Epigenetics and Plant Molecular Biology

Background:

DNA methylation is a crucial epigenetic mark regulating genome activity in plants and mammals.
It plays a vital role in silencing repetitive elements and controlling gene expression.
Significant differences exist in DNA methylation dynamics and inheritance between plants and mammals.

Purpose of the Study:

To review the current understanding of DNA methylation in the flowering plant Arabidopsis thaliana.
To explore the role of RNA interference (RNAi) in the inheritance of DNA methylation.
To discuss paramutation as an extreme example of RNAi-dependent epigenetic regulation.

Main Methods:

Review of existing literature on DNA methylation in Arabidopsis.
Analysis of the role of RNA interference (RNAi) pathways.
Comparison of epigenetic inheritance mechanisms in plants and mammals.

Main Results:

Plants, unlike mammals, propagate DNA methylation states across generations.
RNAi is instrumental in the incremental methylation and silencing of repeat elements over generations in plants.
Paramutation in maize is presented as an extreme manifestation of this RNAi-dependent pathway.

Conclusions:

Arabidopsis exhibits a unique, transgenerational propagation of DNA methylation.
RNAi-dependent pathways are key to maintaining epigenetic states and silencing repeats.
Paramutation exemplifies the power of RNAi in driving epigenetic inheritance.