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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.

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.

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...

Genomic Imprinting and Inheritance

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...

Cis-regulatory Sequences

Cis-regulatory Sequences

Cis-regulatory sequences are short fragments of non-coding DNA that are present on the same chromosomes as the genes that they regulate. These fragments serve as binding sites for transcriptional regulators, proteins that are responsible for controlling gene transcription and differential gene expression across cell types in eukaryotes. Cis-regulatory sequences can be close to the gene of interest or thousands of bases away in the DNA sequence; however, those sequences that are further away are...

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Related Experiment Video

Updated: Dec 10, 2025

Immunostaining for DNA Modifications: Computational Analysis of Confocal Images

Immunostaining for DNA Modifications: Computational Analysis of Confocal Images

Published on: September 7, 2017

Evolutionary insights into DNA methylation in insects.

Karl M Glastad¹, Brendan G Hunt², Michael Ad Goodisman¹

¹School of Biology, Georgia Institute of Technology, Atlanta, GA 30332, USA.

Current Opinion in Insect Science

|August 28, 2020

Summary

DNA methylation, an epigenetic mark crucial for insect development and plasticity, shows conserved targets and linked genomic patterns across diverse taxa. Evolutionary analysis reveals its broad eukaryotic significance.

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Rapid and Efficient Spatiotemporal Monitoring of Normal and Aberrant Cytosine Methylation within Intact Zebrafish Embryos

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Published on: August 18, 2022

Area of Science:

Epigenetics and Molecular Biology
Evolutionary Biology
Insect Genomics

Background:

Epigenetic information, particularly DNA methylation, regulates gene function and is vital for development.
DNA methylation is a key epigenetic mark influencing developmental plasticity in insects.
Understanding DNA methylation patterns and functions in insects is crucial for broader biological insights.

Purpose of the Study:

To review the patterns and functions of DNA methylation in insects.
To highlight the insights gained from applying an evolutionary framework to study insect DNA methylation.
To explore the evolutionary conservation and variability of DNA methylation in insects.

Main Methods:

Literature review focusing on DNA methylation in insects.
Application of an evolutionary framework for analysis.
Comparative analyses of DNA methylation patterns across insect taxa.
Examination of links between DNA methylation and histone modifications.

Main Results:

Evolutionary variation in DNA methylation exists among insect taxa.
Comparative analyses reveal conserved targets of DNA methylation.
Genome-wide distribution of DNA methylation correlates with conserved histone modification patterns.
DNA methylation plays a significant role in insect development and plasticity.

Conclusions:

An evolutionary perspective provides critical insights into the role of DNA methylation in insects.
Conserved and variable aspects of insect DNA methylation offer a model for understanding eukaryotic epigenetic systems.
DNA methylation is a fundamental epigenetic mechanism with conserved roles across diverse life forms.