Augmenting and directing long-range CRISPR-mediated activation in human cells.

Area of Science:

• Molecular Biology
• Gene Regulation
• Epigenetics

Background:

• Epigenetic editing employs artificial transcription factors (aTFs) to modulate gene expression.
• While targeting aTFs to promoters robustly upregulates human genes, activation via distal enhancers is less consistent.
• aTFs offer a powerful tool for precise gene regulation.

Purpose of the Study:

• To enhance the efficiency and reliability of long-range gene activation using CRISPR-based aTFs directed at distal enhancers.
• To demonstrate the utility of this enhanced strategy for controlling gene expression from specific enhancers and achieving allele-selective gene activation.

Main Methods:

• CRISPR-based artificial transcription factors (aTFs) were employed for epigenetic editing.
• The strategy involved concurrently targeting aTFs to both the target gene promoter and distal enhancers.
• Single-nucleotide polymorphisms (SNPs) within distal sequences were utilized for allele-specific targeting.

Main Results:

• Concurrent targeting of aTFs to promoters and enhancers significantly improved the efficiency and reliability of long-range gene activation in human cells.
• The approach enabled precise targeting of gene expression from enhancers capable of regulating multiple promoters.
• Allele-selective gene activation was achieved by targeting aTFs to SNPs in distal regulatory elements.

Conclusions:

• Combining promoter and enhancer targeting with aTFs represents a significant advancement in epigenetic editing.
• This refined strategy expands the capabilities of the epigenetic editing toolbox for diverse research applications.
• The enhanced method holds promise for developing novel therapeutic strategies involving precise gene regulation.