Human Molecular Genetics Advance Access originally published online on July 1, 2003
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Human Molecular Genetics, 2003, Vol. 12, No. 16 2031-2040
DOI: 10.1093/hmg/ddg215
© 2003 Oxford University Press
Characterization of disease-associated mutations affecting an exonic splicing enhancer and two cryptic splice sites in exon 13 of the cystic fibrosis transmembrane conductance regulator gene
1Genetics and Genomics Biology Program, The Hospital for Sick Children, Toronto, Canada, M5G 1X8, 2Department of Molecular and Medical Genetics, University of Toronto, Canada, M5S 1A8, 3Banting and Best Department of Medical Research, CH Best Institute, University of Toronto, Canada, M5G 1L6 and 4The University of Hong Kong, Pokfulam Road, Hong Kong
Received April 18, 2003; Accepted June 19, 2003
Sequences in exons can play an important role in constitutive and regulated pre-mRNA splicing. Since exonic splicing regulatory sequences are generally poorly conserved and their mechanism of action is not well understood, the consequence of exonic mutations on splicing can only be determined empirically. In this study, we have investigated the consequence of two cystic fibrosis (CF) disease-causing mutations, E656X and 2108delA, on the function of a putative exonic splicing enhancer (ESE) in exon 13 of the CFTR gene. We have also determined whether five other CF mutations D648V, D651N, G654S, E664X and T665S located near this putative ESE could lead to aberrant splicing of exon 13. Using minigene constructs, we have demonstrated that the E656X and 2108delA mutations could indeed cause aberrant splicing in a predicted manner, supporting a role for the putative ESE sequence in pre-mRNA splicing. In addition, we have shown that D648V, E664X and T665S mutations could cause aberrant splicing of exon 13 by improving the polypyrimidine tracts of two cryptic 3' splice sites. We also provide evidence that the relative levels of two splicing factors, hTra2
and SF2/ASF, could alter the effect on splicing of some of the exon 13 disease mutations. Taken together, our results suggest that the severity of CF disease could be modulated by changes in the fidelity of CFTR pre-mRNA splicing.
* To whom correspondence should be addressed at: Vice Chancellor's Office, The University of Hong Kong, Pokfulam Road, Hong Kong. Tel: +852 2859 2100; Fax: +852 2858 9435; Email: tsuilc{at}hkucc.hku.hk
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