Only one of these mutations (R553X) is present in the Caucasian CFTR common mutation-screening panel; and none of the 11 mutations are common in Caucasian CF patients.
An individual with the CFTR genotype R553X/F508del-R553Q showed the typical symptoms and electrophysiological anomalies of cystic fibrosis in the airways and intestine.
We have studied the effects of the stop mutation R553X in exon 11 of the CFTR gene by analyzing mRNA extracted from nasal epithelial cells harvested from patients with cystic fibrosis.
Cystic fibrosis (CF) patients bearing the premature translation termination mutation (nonsense mutation) W1282X present severe pulmonary and pancreatic disease, whereas patients carrying other nonsense mutations such as G542X, R553X, S1255X, R1162X, and W1316X show a severe pancreatic but mild pulmonary illness.
The R553X mutation was present on a further 9 out of 86 German non-delta F508 CF chromosomes linked with the XV2c-KM19-Mp6d9-J44-GATT haplotypes 2-2-2-1-1 and 1-1-2-1-2.