Two-Step Recruitment of RNA-Directed DNA Methylation to Tandem Repeats
2006
How Tandem Repeats Help Silence Genes
publication
Evidence: high
Author Information
Author(s): Simon Chan, Steven Jacobsen
Hypothesis
How is methylation machinery directed to tandem repeat sequences?
Conclusion
Tandem repeats are necessary and sufficient to stimulate DNA methylation, which silences genes.
Supporting Evidence
- Tandem repeats are integral to triggering new methylation in the FWA gene.
- An unmethylated FWA gene can cause methylation in Arabidopsis plants.
- Deleting tandem repeats from the introduced gene lost the methylation effect.
- Only introducing one member of the tandem repeat pair did not promote methylation.
Takeaway
Tandem repeats in DNA help make tiny RNA pieces that tell the cell to silence certain genes, like a security system for the genome.
Methodology
The study involved introducing genes with tandem repeats into Arabidopsis plants and measuring the resulting methylation and flowering phenotypes.
Participant Demographics
Arabidopsis plants were used as the model organism.
Digital Object Identifier (DOI)
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