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Genome-wide analysis of day/night DNA methylation differences in Populus nigra
Chang-Jun Ding1,2, Li-Xiong Liang1,2, Shu Diao1,2
1State Key Laboratory of Tree Genetics and Breeding, Research Institute of Forestry, Chinese Academy of Forestry, Beijing, China.
Plos One
|January 3, 2018
Summary
DNA methylation patterns in poplar leaves reveal diurnal gene regulation. While many genes are methylated, only a few differentially methylated regions influence gene expression between day and night.
Area of Science:
- Plant molecular biology
- Epigenetics
- Genomics
Background:
- DNA methylation is a key epigenetic mechanism influencing gene expression.
- While its role in stress and development is known, its function in plant diurnal cycles is unclear.
- Understanding DNA methylation in diurnal adaptation is crucial for plant biology.
Purpose of the Study:
- To investigate global DNA methylation patterns in black poplar (Populus nigra 'N46') leaves at different times of day.
- To identify differentially methylated regions (DMRs) and their potential impact on gene expression during the diurnal cycle.
- To elucidate the role of DNA methylation in plant adaptation to day/night cycles.
Main Methods:
- Methylated DNA immunoprecipitation sequencing (MeDIP-seq) was employed to detect global methylation patterns.
- Global methylation patterns were analyzed in poplar leaves sampled at 8:00 and 24:00.
- Differentially methylated regions (DMRs) were identified by comparing methylation profiles between the two time points.
Main Results:
- A large number of genes (10,027 at 8:00, 10,242 at 24:00) were found to be methylated in poplar leaves.
- Only 440 differentially methylated regions (DMRs) overlapped with genic regions, affecting 137 downstream genes.
- Hyper-methylated genes were linked to transferase and kinase activities, while hypo-methylated genes were associated with protein and ATP binding, indicating distinct diurnal biological processes.
Conclusions:
- DNA methylation is widespread in the poplar genome.
- A small subset of methylated genes is involved in regulating diurnal gene expression.
- These findings provide insights into the role of DNA methylation in poplar adaptation to the day/night cycle.
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