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Abnormal mRNA splicing resulting from three different mutations in the CFTR gene
J Hull1, S Shackleton, A Harris
1Institute of Molecular Medicine, John Radcliffe Hospital, Oxford, UK.
Human Molecular Genetics
|June 1, 1993
Summary
Three cystic fibrosis transmembrane conductance regulator (CFTR) gene mutations were analyzed in patients with cystic fibrosis. These mutations lead to incorrect splicing of CFTR mRNA, confirming their role in the disease.
Area of Science:
- Molecular Biology
- Genetics
- Medical Research
Background:
- Cystic Fibrosis (CF) is a genetic disorder.
- CFTR gene mutations are the primary cause of CF.
- Aberrant splicing of CFTR mRNA can lead to CF pathology.
Purpose of the Study:
- To investigate the functional impact of three specific CFTR gene splicing mutations.
- To analyze CFTR mRNA splicing in patients with classical cystic fibrosis symptoms.
Main Methods:
- mRNA analysis from nasal epithelial cells of CF patients.
- Study included six CF patients with specific CFTR mutations (621+1G>T, 1717-1G>A, 1898+1G>A) and delta F508.
- Comparison with ten non-CF control subjects.
Main Results:
- The 621+1G>T mutation caused alternative splice site activation or exon 4 skipping.
- The 1717-1G>A mutation led to exon 11 skipping.
- The 1898+1G>A mutation resulted in exon 12 skipping.
Conclusions:
- The studied CFTR mutations induce aberrant splicing of CFTR mRNA.
- These splicing defects correlate with predicted changes in genomic sequence.
- Confirms the pathogenic role of these specific CFTR splicing mutations in cystic fibrosis.