Mutations
In the Netherlands, about 1600 people have CF. CF is caused by a mutation in the DNA located in the CFTR gene.
The five most common CFTR gene mutations are F508del, G542X, G551D, N1303K, and W1282X.
Individuals with CF can have two copies of the same CF mutation or two different CF mutations. In Northern Europe, over 80% of CF patients have the delta-F508 mutation.