Identification of a new cystic fibrosis transmembrane regulator mutation in a severely affected patient.

By using a combination of multiplex polymerase chain reaction and allele-specific labelled probes, the oligo-ligation assay is designed to detect known cystic fibrosis transmembrane regulator mutations. This study shows that this assay may also be useful to detect new mutations. The second child of a family of Bosnic origin showed all the symptoms of intestinal and pulmonary manifestations of cystic fibrosis. No signal could be obtained for the allele-specific probe 1898+1G>A. This could be explained by a nearby localized sequence change that prevented polymerase chain reaction primers or oligonucleotide probes from binding to the target sequence. Indeed, sequence analysis revealed a new 1894G>T exchange (Glu587Stop). Both parents and the healthy brother carried this mutation. Thus, the index patient was homozygous for 1894G>T, which was inherited from both parents.