Genomic DNA sequence of the cystic fibrosis transmembrane conductance regulator (CFTR) gene

Julian Zielenski*, Richard Rozmahel, Dominique Bozon, Bat sheva Kerem, Zbyszko Grzelczak, John R. Riordan, Johanna Rommens, Lap Chee Tsui

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

523 Scopus citations

Abstract

The gene responsible for cystic fibrosis, the most common severe autosomal recessive disorder, is located on the long arm of human chromosome 7, region q31-q32. The gene has recently been identified and shown to be approximately 250 kb in size. To understand the structure and to provide the basis for a systematic analysis of the disease-causing mutations in the gene, genomic DNA clones spanning different regions of the previously reported cDNA were isolated and used to determine the coding regions and sequences of intron/exon boundaries. A total of 22,708 bp of sequence, accounting for approximately 10% of the entire gene, was obtained. Alignment of the genomic DNA sequence with the cDNA sequence showed perfect colinearity between the two and a total of 27 exons, each flanked by consensus splice signals. A number of repetitive elements, including the Alu and Kpn families and simple repeats, such as (GT)17, (GATT)7, and (TA)14, were detected in close vicinity of some of the intron/exon boundaries. At least three of the simple repeats were found to be polymorphic in the population. Although an internal amino acid sequence homology could be detected between the two halves of the predicted polypeptide, especially in the regions of the two putative nucleotide-binding folds (NBF1 and NBF2), the lack of alignment of the nucleotide sequence as well as the different positions of the exon/intron boundaries does not seem to support the hypothesis of a recent gene duplication event. To facilitate detection of mutations by direct sequence analysis of genomic DNA, 28 sets of oligonucleotide primers were designed and tested for their ability to amplify individual exons and the immediately flanking sequences in the introns.

Original languageAmerican English
Pages (from-to)214-228
Number of pages15
JournalGenomics
Volume10
Issue number1
DOIs
StatePublished - May 1991
Externally publishedYes

Bibliographical note

Funding Information:
The authors thank D. Kennedy, D. Markiewicz, and N. Plavsic for expert technical assistance and A. Beaudet, X. Estivill, P. Ga-sparini, M. Goossens, P. F. Pignatti, and M. Vidaud for communication of data prior to publication. This work was supported by grants from the National Institutes of Health (DK34944), the Cystic Fibrosis Foundation (U.S.A.), the Canadian Cystic Fibrosis Foundation, and B’nai B’rith Foundation (Don Mills Lodge). L.-C.T. is a recipient of the Scientist Award from the Medical Research Council of Canada.

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