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Updated: Jul 18, 2025
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Efficient and Rapid Isolation of Early-stage Embryos from Arabidopsis thaliana Seeds
Published on: June 7, 2013
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Epigenomic divergence correlates with sequence polymorphism in Arabidopsis paralogs
Sunil K Kenchanmane Raju1, Mariele Lensink2, Daniel J Kliebenstein2
1Department of Plant Biology, Michigan State University, East Lansing, MI, 48824, USA.
The New Phytologist
|August 24, 2023
Summary
Epigenetic marks influence gene evolution. Genes with specific methylation patterns show varying sequence polymorphism rates, impacting the evolution of gene duplicates in Arabidopsis thaliana.
Area of Science:
- Evolutionary biology
- Genomics
- Epigenetics
Background:
- Sequence polymorphism rates are crucial for gene duplicate evolution.
- Gene activity and sequence polymorphism influence the maintenance of gene duplicates.
- Epigenetic modifications, like DNA methylation, are linked to gene expression and evolutionary processes.
Purpose of the Study:
- To investigate epigenome-associated polymorphism rates in Arabidopsis thaliana.
- To determine if these rates affect the evolution of gene duplicates.
- To explore the relationship between gene expression, epigenetics, and polymorphism.
Main Methods:
- Classified genes based on exon methylation patterns: unmethylated (unM), gene-body methylated (gbM), and transposon-like methylated (teM).
- Compared sequence polymorphism frequencies and genetic differentiation across these gene categories.
- Analyzed patterns in gene duplicates consistent with genome-wide trends.
Main Results:
- Polymorphism frequency was higher in teM (transcriptionally repressed) genes and lower in gbM (actively expressed) genes.
- Gene duplicates exhibiting teM accumulated more variation and evolved faster.
- Genes with teM showed chromatin states associated with reduced DNA repair.
Conclusions:
- Epigenome-mediated variation in polymorphism rates impacts the evolutionary trajectories of gene duplicates.
- This variation may disrupt stable states that maintain genetic redundancies, favoring neofunctionalization.
- Epigenetic regulation of polymorphism can facilitate the evolution of novel gene functions in paralogs.
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