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* From the Service de Pneumologie (Drs. Marchand, Delaunois, Brancaleone, and Vandenplas), Cliniques Universitaires de Mont-Godinne, Université Catholique de Louvain, Yvoir; Service de Pneumologie (Dr. Mairesse), Clinique Saint-Luc, Bouge; and Centre de Génétique Humaine et Unité de Génétique Médicale (Dr. Verellen-Dumoulin and Mr. Rahier), Université Catholique de Louvain, Brussels, Belgium.
Correspondence to: Eric Marchand, MD, Service de Pneumologie, Cliniques Universitaires de Mont-Godinne, 5530-Yvoir, Belgium; e-mail: eric.marchand{at}pneu.ucl.ac.be
Study objective: To assess the frequency of cystic fibrosis transmembrane conductance regulator (CFTR) gene mutations in patients with allergic bronchopulmonary aspergillosis (ABPA).
Design: Case-control study. All subjects in the study were
screened for the presence of 13 mutations in the CFTR gene (R117H,
621 + 1G->T, R334 W, 
F508, I507, 1717–1G->A, G542X, R553X,
G551D, R1162X, 3849 + 10kbC->T, W1282X, and N1303K). Moreover, they
were also screened for the presence of the 5T variant in intron 8.
Setting: University hospital and community-based hospital.
Patients: Twenty-one white patients with ABPA participated in the study. The presence of CFTR mutations was also investigated in 43 white subjects with allergic asthma who did not show sensitization to Aspergillus fumigatus and in 142 subjects seeking genetic counseling for diseases other than cystic fibrosis (CF).
Results: Six patients with ABPA were
found to be heterozygous for one CFTR mutation, including F508
(n = 2), G542X (n = 1), R1162X (n = 1), 1717–1G->A (n = 1),
and R117H (n = 1). The 5T allele was not detected in ABPA patients.
None of the ABPA patients showed sweat chloride concentrations > 60
mEq/L. The frequency of CFTR mutation carriers was significantly higher
in ABPA patients (6 of 21 patients; 28.5%) than in control asthmatic
subjects (2 of 43 subjects; 4.6%; p = 0.01) and in subjects seeking
genetic counseling (6 of 142 subjects; p < 0.001).
Conclusion: These findings indicate that in patients without a clinical diagnosis of CF, CFTR gene mutations could be involved in the development of ABPA, in association with other genetic or environmental factors.
Key Words: allergic bronchopulmonary aspergillosis • cystic fibrosis • cystic fibrosis transmembrane conductance regulator gene.
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