Cystic fibrosis (CF), one of the most common autosomal recessive genetic disorders in populations of northern European extraction, is caused by dysfunction of the CF transmembrane conductance regulator (CFTR), a chloride channel present in the epithelial lining of several tissues, including the airways, intestine, pancreatic ducts, testes and sweat glands (Gadsby et al., 2006). This evidence concerns the gene CFTR and cystic fibrosis.