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Protein-coding genes are epigenetically regulated in Arabidopsis polyploids
1Genetics Program and Department of Soil and Crop Sciences, Texas A&M University, College Station, TX 77843-2474, USA.
Summary
Genome duplication can lead to gene silencing in polyploid plants. This study identified silenced genes in Arabidopsis suecica, revealing epigenetic regulation of gene expression in polyploid genomes.
Area of Science:
- Genomics
- Plant Biology
- Epigenetics
Background:
- The fate of redundant genes after genome duplication is largely unknown.
- While ribosomal RNA genes are known to be silenced, regulatory mechanisms for protein-coding genes in polyploid genomes remain unclear.
- Studying homologous gene expression in polyploids is challenging.
Purpose of the Study:
- To conduct a genome-wide screen for silenced orthologous genes in the allotetraploid Arabidopsis suecica.
- To investigate the regulatory mechanisms governing gene expression in polyploid genomes.
Main Methods:
- Utilized amplified fragment length polymorphism (AFLP)-cDNA display for a genome-wide screen.
- Analyzed gene silencing in Arabidopsis suecica, an allotetraploid hybrid of Arabidopsis thaliana and Cardaminopsis arenosa.
Main Results:
- Identified ten silenced genes in A. suecica, originating from either A. thaliana or C. arenosa.
- Found silenced genes located on four of the five A. thaliana chromosomes, including transcription factors like TCP3.
- Observed hypermethylation of silenced genes near TCP3, which were reactivated upon blocking DNA methylation, indicating epigenetic regulation.
Conclusions:
- Epigenetic regulation plays a role in the expression of orthologous genes within polyploid genomes.
- Epigenetic regulation may offer an adaptive advantage for polyploid species during evolution and development compared to genetic mutations.