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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.
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...
Polytene Chromosomes02:04

Polytene Chromosomes

Polytene chromosomes are giant interphase chromosomes with several DNA strands placed side by side. They were discovered in the year 1881 by Balbiani in salivary glands, intestine, muscles, malpighian tubules, and hypoderm of larvae Chironomus plumosus. Hence, these are also called "Salivary gland chromosomes." These are found in insects of the order Diptera and Collembola; in certain organs of mammals; and synergids, antipodes of flowering plants. Polytene chromosomes are also regularly...

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Related Experiment Video

Updated: Jun 17, 2026

DNA Methylation: Bisulphite Modification and Analysis
12:34

DNA Methylation: Bisulphite Modification and Analysis

Published on: October 21, 2011

Polyploidy and DNA methylation: new tools available.

Armel Salmon1, Malika L Ainouche

  • 1Department of Ecology, Evolution, and Organismal Biology, Iowa State University, Ames, IA 50011, USA. asalmon@iastate.edu

Molecular Ecology
|January 19, 2010
PubMed
Summary

Polyploidy, common in plants, involves genome duplication. New polyploid plant lineages exhibit stable DNA methylation changes, influencing gene expression and unique phenotypes, as shown in dandelions.

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Area of Science:

  • Plant genomics
  • Epigenetics
  • Evolutionary biology

Background:

  • Most plant species are polyploids, resulting from genome duplication events.
  • Cultivated and invasive plants are often recent, hybrid polyploids (allopolyploids), exhibiting fixed heterozygosity and novel phenotypes.
  • Polyploid speciation involves genomic rearrangements and altered gene expression, driven by interactions between homoeologous genes and epigenetic modifications.

Discussion:

  • Gene expression changes in polyploids arise from homoeologous gene interactions, the fate of duplicated genes (loss, pseudogenization, sub/neofunctionalization), and epigenetic alterations.
  • DNA methylation patterns are consistently affected by hybridization and genome doubling in newly formed polyploid species.
  • Verhoeven et al. studied DNA methylation in asexual triploid dandelion lineages, revealing stably transmitted methylation changes.

Key Insights:

  • Ploidy level changes in dandelions lead to unique, stably transmitted DNA methylation patterns in new lineages.
  • Epigenetic regulation, particularly DNA methylation, plays a crucial role in polyploid evolution and phenotype diversification.
  • Newly formed polyploid lineages possess distinct epigenetic landscapes influencing their genetic makeup.

Outlook:

  • Advancements in high-throughput sequencing offer powerful tools to investigate epigenetic variation in polyploid plants.
  • Future research can utilize these methods to explore epigenetic polymorphism in both model and non-model plant systems.
  • Understanding epigenetic mechanisms in polyploids is key to crop improvement and understanding plant adaptation.