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Related Concept Videos

Epigenetic Regulation01:37

Epigenetic Regulation

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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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RNA Stability01:53

RNA Stability

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Intact DNA strands can be found in fossils, while scientists sometimes struggle to keep RNA intact under laboratory conditions. The structural variations between RNA and DNA underlie the differences in their stability and longevity. Because DNA is double-stranded, it is inherently more stable. The single-stranded structure of RNA is less stable but also more flexible and can form weak internal bonds. Additionally, most RNAs in the cell are relatively short, while DNA can be up to 250 million...
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Position-effect Variegation02:32

Position-effect Variegation

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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.
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Histone Modification02:32

Histone Modification

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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.
Acetylation
The enzyme histone acetyltransferase adds acetyl group to the histones. Another enzyme, histone...
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Chromatin Position Affects Gene Expression02:35

Chromatin Position Affects Gene Expression

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Chromatin is the massive complex of DNA and proteins packaged inside the nucleus. The complexity of chromatin folding and how it is packaged inside the nucleus greatly influences  access to genetic information. Generally, the nucleus' periphery is considered transcriptionally repressive, while the cell's interior is considered a transcriptionally active area. 
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Related Experiment Video

Updated: Jul 18, 2025

Immunostaining for DNA Modifications: Computational Analysis of Confocal Images
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Stochasticity in gene body methylation.

Constantin Goeldel1, Frank Johannes1

  • 1Plant Epigenomics, Technical University of Munich, Germany.

Current Opinion in Plant Biology
|August 19, 2023
PubMed
Summary

Gene body methylation (gbM) is a stable epigenetic mark in plants, yet individual CG sites are stochastic. This study explores how stochastic processes explain gbM maintenance, offering insights into its molecular and evolutionary roles.

Keywords:
CMT3DNA methylationEpimutation rateEpimutationsEvolutionGene body methylationH2A.ZMET1ModelingSteady state

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Area of Science:

  • Epigenetics
  • Plant Genomics
  • Molecular Evolution

Background:

  • Gene body methylation (gbM) is a conserved epigenetic feature in plant genomes.
  • The precise mechanisms of gbM's role in transcriptional regulation and its evolutionary significance are not fully understood.
  • gbM levels are stable across cell divisions, but individual CG dinucleotides exhibit stochastic methylation patterns.

Purpose of the Study:

  • To reconcile the apparent contradiction between stable gbM levels and stochastic methylation at individual sites.
  • To investigate the relationship between stochastic processes and gbM maintenance dynamics.
  • To provide a quantitative understanding of gbM for deeper insights into its molecular and evolutionary biology.

Main Methods:

  • Review and theoretical analysis of stochastic processes in epigenetic maintenance.
  • Quantitative modeling of gbM dynamics.
  • Integration of existing experimental data on gbM stability and variability.

Main Results:

  • Stochastic processes are key to understanding gbM maintenance dynamics.
  • A quantitative framework can explain the coexistence of stable gbM levels and stochastic methylation.
  • Insights into the molecular mechanisms underlying gbM stability and variability.

Conclusions:

  • Stochasticity is fundamental to gbM dynamics, not a deviation from stability.
  • Quantitative analysis of stochastic processes provides a unified view of gbM.
  • This approach deepens our understanding of the molecular basis and evolutionary trajectory of gbM in plants.