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Updated: Oct 11, 2025
07:34
A Method to Study de novo Formation of Chromatin Domains
Published on: August 23, 2019
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Heterochromatin is a quantitative trait associated with spontaneous epiallele formation
Yinwen Zhang1, Hosung Jang2, Rui Xiao1
1Institute of Bioinformatics, University of Georgia, Athens, GA, USA.
Nature Communications
|November 30, 2021
Summary
New research reveals that spontaneous hypermethylated epialleles in plants arise from feedback regulation of DNA methylation pathways, impacting gene expression without altering DNA sequence. This finding sheds light on epigenetic variation origins.
Area of Science:
- Epigenetics
- Plant Genomics
- Molecular Biology
Background:
- Epialleles, heritable gene expression variations without DNA sequence changes, are common in plants but their origins are unclear.
- Understanding epiallele origins is crucial for plant biology and breeding.
Purpose of the Study:
- To investigate the molecular mechanisms underlying the origin of spontaneous hypermethylated epialleles in Arabidopsis thaliana.
- To elucidate the role of DNA methylation maintenance pathways in generating epigenetic variation.
Main Methods:
- Utilized mutant and experimental populations of Arabidopsis thaliana.
- Generated single base resolution methylomes from epigenetic recombinant inbred lines (epiRIL).
- Mapped three-dimensional chromatin contacts.
Main Results:
- Ectopic hypermethylation leading to epialleles results from feedback regulation of heterochromatin maintenance pathways.
- Epiallelic variation is abundant in euchromatin and associates with quantitative trait loci (QTL) in heterochromatin.
- Hotspots for ectopic hypermethylation show increased chromatin contact with H3K9me2-marked regions.
Conclusions:
- Feedback regulation of heterochromatin maintenance pathways drives the origin of spontaneous hypermethylated epialleles.
- Epigenetic variation can arise from the interplay between heterochromatin and euchromatin regulatory mechanisms.
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