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In Vitro Selection of Engineered Transcriptional Repressors for Targeted Epigenetic Silencing

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Activating frataxin expression by repeat-targeted nucleic acids.

Liande Li¹, Masayuki Matsui¹, David R Corey¹

¹Departments of Pharmacology and Biochemistry, UT Southwestern Medical Center at Dallas, 6001 Forest Park Road, Dallas, Texas 75390-9041, USA.

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Summary

This summary is machine-generated.

Synthetic nucleic acids targeting GAA repeats can restore frataxin (FXN) protein levels in Friedreich

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Area of Science:

Genetics
Molecular Biology
Neuroscience

Background:

Friedreich's ataxia is a genetic disorder caused by GAA trinucleotide repeat expansion in the FXN gene.
This expansion leads to reduced frataxin (FXN) protein expression.
Transcriptional repression is linked to R-loop formation between expanded RNA and DNA.

Purpose of the Study:

To investigate if synthetic nucleic acids can increase FXN protein levels.
To explore R-loop interference as a gene activation strategy.

Main Methods:

Introduction of anti-GAA duplex RNAs and single-stranded locked nucleic acids into patient-derived cells.
Quantification of FXN protein expression levels.

Main Results:

Synthetic nucleic acids successfully increased FXN protein expression.
Restored FXN levels were comparable to wild-type cells.
Interference with R-loop formation triggered gene activation.

Conclusions:

Synthetic nucleic acids targeting GAA repeats are potential therapeutic lead compounds for Friedreich's ataxia.
Interfering with R-loop formation offers a novel strategy for gene upregulation.