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Updated: Oct 24, 2025
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Identification of Alternative Splicing and Polyadenylation in RNA-seq Data
Published on: June 24, 2021
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Epigenetic differences in an identical genetic background modulate alternative splicing in A. thaliana
Saurabh Chaudhary1, Ibtissam Jabre2, Naeem H Syed3
1School of Psychology and Life Sciences, Canterbury Christ Church University, Canterbury CT1 1QU, UK; Cardiff School of Biosciences, Cardiff University, Cardiff CF10 3AX, UK.
Genomics
|August 15, 2021
Summary
Investigating DNA methylation and nucleosome occupancy in Arabidopsis thaliana revealed their crucial role in regulating alternative splicing (AS) under varying temperatures. These epigenetic factors significantly influence gene expression and AS responses to cold stress.
Area of Science:
- Plant molecular biology
- Epigenetics
- Transcriptomics
Background:
- Alternative splicing (AS) regulation by epigenetic factors like DNA methylation and nucleosome occupancy is not well understood in plants.
- Temperature variations can impact epigenetic modifications and gene expression.
Purpose of the Study:
- To investigate how DNA methylation and nucleosome occupancy influence alternative splicing in Arabidopsis thaliana under normal and cold conditions.
- To understand the stability and temperature-dependent variations of these epigenetic marks.
Main Methods:
- Generation of transcriptome, whole-genome bisulfite, and MNase sequencing data.
- Comparative analysis between an epigenetic Recombinant Inbred Line (epiRIL) and its parental ecotype Columbia (Col-0).
- Utilizing previously published DNA methylation profiles for Col-0.
Main Results:
- Significant epigenetic differences (DNA methylation and nucleosome occupancy) were observed between Col-0 and epiRIL lines at both normal and cold temperatures.
- Differential DNA methylation and nucleosome occupancy were found to modulate gene expression and alternative splicing in response to cold.
- Characteristic patterns of DNA methylation and nucleosome levels were identified around intron-exon boundaries, influencing AS.
Conclusions:
- Epigenetic variations, specifically in DNA methylation and nucleosome occupancy, are sufficient to modulate alternative splicing in Arabidopsis.
- These epigenetic modifications play a critical role in plant responses to environmental changes like cold stress.
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