Cas9 nickase-mediated contraction of CAG/CTG repeats is associated with phenotypic improvements in a Huntington's disease mouse model.
Expanded CAG/CTG repeats cause more than 15 different diseases that all remain without a disease-modifying treatment. Because repeat length accounts for most of the variation in disease severity, contracting CAG/CTG repeats presents an attractive therapeutic avenue. Here, we show that the CRISPR-Cas9 nickase targeted t...