Rewiring miR-22/SNAI1 via CRISPR-based edge editing destabilizes the epithelial phenotype

Area of Science:

• Molecular Biology
• Cell Biology
• Genetics

Background:

• Epithelial-to-Mesenchymal Transition (EMT) is crucial for cell migration and invasion.
• Transforming growth factor β (TGFβ) signaling and transcription factors (TFs) like SNAIL drive EMT.
• MicroRNAs (miRNAs) regulate gene expression and are involved in EMT, with miR-22 targeting EMT drivers.

Purpose of the Study:

• To investigate the impact of specific regulatory connections on EMT dynamics.
• To explore CRISPR-based network rewiring by ablating individual interactions.
• To determine the role of the miR-22 and SNAI1 interaction in TGFβ-mediated EMT.

Main Methods:

• CRISPR-based gene editing to selectively remove the miR-22 target site from the SNAI1 gene.
• Perturbation of the direct regulatory connection between miR-22 and SNAI1.
• Analysis of EMT phenotypes and TGFβ sensitivity.

Main Results:

• Ablating the miR-22 target site on SNAI1 increased cell sensitivity to TGFβ-induced EMT.
• The observed EMT effects were attributable to the disruption of the single miR-22-SNAI1 interaction.
• This specific interaction was found to be independent of miR-22's other targets or indirect regulatory pathways.

Conclusions:

• Edge-specific perturbation via CRISPR is a powerful tool for dissecting biological networks.
• The direct regulatory link between miR-22 and SNAI1 plays a critical role in controlling EMT.
• Targeting specific interactions within regulatory networks offers potential for novel therapeutic strategies.