The importance of DNA methylation of exons on alternative splicing

RNA
Ronna ShayevitchGil Ast

Abstract

Alternative splicing (AS) contributes to proteome diversity. As splicing occurs cotranscriptionally, epigenetic determinants such as DNA methylation likely play a part in regulation of AS. Previously, we have shown that DNA methylation marks exons and that a loss of DNA methylation alters splicing patterns in a genome-wide manner. To investigate the influence of DNA methylation on splicing of individual genes, we developed a method to manipulate DNA methylation in vivo in a site-specific manner using the deactivated endonuclease Cas9 fused to enzymes that methylate or demethylate DNA. We used this system to directly change the DNA methylation pattern of selected exons and introns. We demonstrated that changes in the methylation pattern of alternatively spliced exons, but not constitutively spliced exons or introns, altered inclusion levels. This is the first direct demonstration that DNA methylation of exon-encoding regions is directly involved in regulation of AS.

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Citations

May 23, 2020·Epigenetics : Official Journal of the DNA Methylation Society·Judit SymmankGeraldine Zimmer-Bensch
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Jun 28, 2019·Chemical Research in Toxicology·Diana M Paredes-CéspedesAurora E Rojas-García

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