Abstract
Using in vitro amplification of cDNA by the polymerase chain reaction, we analyzed alternatively spliced events of cystic fibrosis transmembrane conductance regulator gene in lymphoblastoid cells. Ten alternatively spliced transcripts were identified using analysis of 6 overlapping segments of amplified cDNA, 4 of which have not been described previously. These include transcripts lacking exon 16, 17b, 22 and a transcript resulting from the use of a cryptic acceptor and donor splice sites. Moreover, in 2 cystic fibrosis (CF) patients bearing nonsense mutations E60X or W1282X, we observed that nonsense mutations are associated with an alteration of splice site selection in vivo resulting in exon skipping of constitutive exons or in the use of cryptic splice sites. In addition, even though lymphoblastoid cells are not the relevant tissue to address the question of the relationship between clinical respiratory phenotype and genotype, our results concerning adult CF patients (ΔF508/ΔF508) suggest that individual-specific RNA splicing patterns could influence the severity of the CF pulmonary disease. If this phenomenon of alternative splicing events proves to be significant in CF and to be a common feature of disease genes, the study of RNA splicing could become an important tool for the analysis of the genotype-phenotype relationship in many inherited disorders.
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Acknowledgements
We thank Dr Dominique Recan for providing lymphoblastoid cells from CF and non-CF patients. This work was supported in part by AFLM (Association Française de Lutte contre la mucoviscidose).
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Bienvenu, T., Beldjord, C., Chelly, J. et al. Analysis of Alternative Splicing Patterns in the Cystic Fibrosis Transmembrane Conductance Regulator Gene Using mRNA Derived from Lymphoblastoid Cells of Cystic Fibrosis Patients. Eur J Hum Genet 4, 127–134 (1996). https://doi.org/10.1159/000472186
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DOI: https://doi.org/10.1159/000472186
