# In Vitro Correction of Point Mutations in the DYSF Gene Using Prime Editing

## TL;DR

This paper shows that prime editing can correct point mutations in the DYSF gene, which causes dysferlinopathy, with varying efficiency in different cell types.

## Contribution

The study demonstrates the first in vitro correction of DYSF gene mutations using prime editing and compares editing efficiency across cell types.

## Key findings

- Prime editing corrected DYSF gene mutations in HEK293T cells with up to 31% efficiency.
- Editing was more efficient in myoblasts compared to patient-derived fibroblasts.
- A new myoblast clone with a patient mutation was created using prime editing from a healthy cell line.

## Abstract

Dysferlinopathy is caused by over 500 mutations in the gene encoding dysferlin, including close to 300 point mutations. One option to cure the disease is to use a gene therapy to correct these mutations at the root. Prime editing is a technique which can replace the mutated nucleotide with the wild-type nucleotide. In this article, prime editing is used to correct several point mutations in the DYSF gene responsible for dysferlinopathy. In vitro editing of HEK293T cells reaches up to 31%. Notably, editing was more efficient in myoblasts than in patient-derived fibroblasts. The prime editing technique was also used to create a new myoblast clone containing a patient mutation from a healthy myoblast cell line.