The p.Gly622Asp (G622D) mutation, frequently found in Reunion Island and in black populations, is associated with a wide spectrum of CF and CFTR-RD phenotypes

Examination of genotype–phenotype correlations along with functional evaluation of CFTR mutations may not be straightforward. The c.1865G > A, p.Gly622Asp (G622D), located at the NBD1 C terminus of the CFTR protein, was initially reported in patients with male infertility. However, the substitution of Gly622 by an aspartic acid in vitro would perturb the local structure or even affect the CFTR folding itself. In order to determine whether p.Gly622Asp affects the risk of developing a CFTR-Related disorder (CFTR-RD) or cystic fibrosis (CF), we analyzed the phenotype of subjects bearing the p.Gly622Asp mutation. We report molecular and clinical analyses in eleven unrelated patients with CF or CFTR-RD with compound heterozygosity for the p.Gly622Asp mutation. On the basis of the clinical features presented by the eleven patients, we postulate that the p.Gly622Asp might be associated with a wide spectrum of phenotypes including classical cystic fibrosis.