CRISPR-Cas9 genome editing in the parental iPSC line PCIi033-A to introduce the homozygous mutation p.F508del (c.1521_1523del) in the CFTR gene.

Cystic Fibrosis (CF) is an autosomal recessive disease caused by mutations in the CFTR gene. Patients carrying the most common mutation, p.F508del, benefit from the triple therapy Kaftrio®. We genome-edited the commercially available iPSC line PCIi033-A (wild-type CFTR) to generate the subclone PCIi033-A-5, which is homozygous for the mutation c.1521_1523del (p.F508del), using CRISPR-SpCas9 tools. PCIi033-A-5 has a normal karyotype and stem cell morphology, is pluripotent, and differentiates into the three germ layers. Introducing this mutation in a parental isogenic iPSC line is essential to demonstrate the feasibility of modeling CF disease after differentiation of the iPS cells into bronchial epithelium.