Frequency of cystic fibrosis transmembrane conductance regulator gene mutations and 5T allele in patients with allergic bronchopulmonary aspergillosis.
OBJECTIVE
To assess the frequency of cystic fibrosis transmembrane conductance regulator (CFTR) gene mutations in patients with allergic bronchopulmonary aspergillosis (ABPA).


METHODS
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, Delta F508, Delta 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.


METHODS
University hospital and community-based hospital.


METHODS
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 Delta 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).


CONCLUSIONS
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.
Service de Pneumologie, Cliniques Universitaires de Mont-Godinne, Université Catholique de Louvain, Yvoir, Belgium. eric.marchand@pneu.ucl.ac.be
E
E
Marchand
C
C
Verellen-Dumoulin
M
M
Mairesse
L
L
Delaunois
P
P
Brancaleone
J F
JF
Rahier
O
O
Vandenplas
D000328:Adult; D000368:Aged; D001229:Aspergillosis, Allergic Bronchopulmonary / Q000235:genetics*; D001249:Asthma / Q000235:genetics; D016022:Case-Control Studies; D019005:Cystic Fibrosis Transmembrane Conductance Regulator / Q000235:genetics*; D005787:Gene Frequency; D006580:Genetic Carrier Screening; D005817:Genetic Counseling; D006801:Humans; D008875:Middle Aged; D009154:Mutation
C505032:CFTR protein, human; D019005:Cystic Fibrosis Transmembrane Conductance Regulator