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Locus-Specific Regulation of Xist Expression Using the CRISPR-Cas9-Based System
Mingtian Deng1, Zifei Liu1, BaoBao Chen1
1Jiangsu Livestock Embryo Engineering Laboratory, College of Animal Science and Technology, Nanjing Agricultural University, Nanjing, China.
DNA and Cell Biology
|February 20, 2020
Summary
Researchers developed a novel CRISPR-Cas system method to regulate X inactive-specific transcript (Xist) expression via targeted DNA methylation. This approach successfully decreased Xist expression without affecting global DNA methylation levels.
Area of Science:
- Epigenetics
- Gene Regulation
- CRISPR Technology
Background:
- DNA methylation is crucial for regulating gene expression, including the X inactive-specific transcript (Xist).
- Previous methods to study DNA methylation's role in Xist regulation caused global DNA methylation changes.
- A locus-specific method is needed to precisely control Xist expression via DNA methylation.
Purpose of the Study:
- To develop and validate a novel CRISPR-Cas system for targeted DNA methylation of the Xist gene.
- To investigate the effect of locus-specific DNA methylation on Xist expression.
- To assess genome-wide DNA methylation changes using this novel method.
Main Methods:
- Utilized a clustered regularly interspaced short palindromic repeat (CRISPR)-Cas system with deactivated Cas9 (dCas9) fused to the catalytic domain of DNA methyltransferase Dnmt3a.
- Designed single-guide RNAs (sgRNAs) targeting the Xist differential methylation region (DMR).
- Employed bisulfite PCR and quantitative real-time PCR to analyze methylation levels and Xist expression.
Main Results:
- Targeted DNA methylation of the Xist DMR significantly increased methylation levels.
- All three sgRNAs effectively downregulated Xist expression compared to mock-transfected cells.
- No significant changes in genome-wide DNA methylation or expression of key DNA methylation regulators were observed.
Conclusions:
- The CRISPR-Cas based system enables precise, locus-specific DNA methylation of the Xist DMR.
- Directed DNA methylation of the Xist DMR effectively reduces Xist expression.
- This method provides a valuable tool for studying gene regulation without inducing global epigenetic alterations.
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