A Novel Mutation in the Cystic Fibrosis Gene in Patients with Pulmonary Disease but Normal Sweat Chloride Concentrations
W. Edward Highsmith, Lauranell H. Burch, Zhaoqing Zhou, John C. Olsen, Thomas E. Boat, Alexander Spock, Jack D. Gorvoy, Lynne Quittell, Kenneth J. Friedman, Lawrence M. Silverman, Richard C. Boucher, and Michael R. Knowles
Background Many patients with chronic pulmonary disease similarto that seen in cystic fibrosis have normal (or nondiagnostic)sweat chloride values. It has been difficult to make the diagnosisof cystic fibrosis in these patients because no associated mutationin the cystic fibrosis transmembrane conductance regulator (CFTR)gene has been identified.
Methods We evaluated 23 patients with pulmonary disease characteristicof cystic fibrosis but with sweat chloride concentrations inthe normal range. Mutations in the CFTR gene were sought bydirect sequencing of polymerase chain reaction-amplified nasalepithelial messenger RNA and by testing the functioning of affectedepithelium.
Results A cytidine phosphate guanosine dinucleotide C-to-T pointmutation in intron 19 of the CFTR gene, termed 3849+10 kb Cto T, was identified in 13 patients from eight unrelated families.This mutation was found in patients from three different ethnicgroups with three different extended haplotypes. The mutationleads to the creation of a partially active splice site in intron19 and to the insertion into most CFTR transcripts of a new84-base-pair "exon," containing an in-frame stop codon, betweenexons 19 and 20. Normally spliced transcripts were also detectedat a level approximately 8 percent of that found in normal subjects.This mutation is associated with abnormal nasal epithelial andsweat acinar epithelial function.
Conclusions We have identified a point mutation in intron 19of CFTR and abnormal epithelial function in patients who havecystic fibrosis-like lung disease but normal sweat chloridevalues. The identification of this mutation indicates that thissyndrome is a form of cystic fibrosis. Screening for the mutationshould prove diagnostically useful in this population of patients.
Source Information
From the Applied Technology Genetics Corp., Malvern, Pa. (W.E.H.); the Department of Medicine (L.H.B., Z.Z., J.C.O., R.C.B., M.R.K.) and the Division of Molecular Pathology (Z.Z., K.J.F., L.M.S.), University of North Carolina, Chapel Hill; Children's Hospital Medical Center, Cincinnati (T.E.B.); the Department of Pediatrics, Duke University, Durham, N.C. (A.S.); Schneider Children's Hospital-Long Island Jewish Medical Center, New Hyde Park, N.Y. (J.D.G.); and the Pediatric Pulmonary Division, Columbia-Presbyterian Medical Center, New York (L.Q.).
Address reprint requests to Dr. Knowles at the Division of Pulmonary Diseases, 724 Burnett-Womack Bldg., CB 7020, University of North Carolina at Chapel Hill, Chapel Hill, NC 27599-7020.
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