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Type: Journal article
Title: Intron-8 polythymidine sequence in Australasian individuals with CF mutations R117H and R117C
Author: Massie, R.
Poplawski, N.
Wilcken, B.
Goldblatt, J.
Byrnes, C.
Robertson, C.
Citation: European Respiratory Journal, 2001; 17(6):1195-1200
Publisher: Munksgaard Int Publ Ltd
Issue Date: 2001
ISSN: 0903-1936
Statement of
R.J.H. Massie, N. Poplawski, B. Wilcken, J. Goldblatt, C. Byrnes, C. Robertson
Abstract: Compound heterozygotes for a severe cystic fibrosis transmembrane conductance regulator (CFTR) mutation and the R117H or R117C mutation (R117H/C) have clinical presentations that vary from classic cystic fibrosis (CF) to an incidental genetic finding. The aim of this study was to assess the influence of the intron-8 polythvmidine sequence (IVS8) on the relationship between genotype and phenotype of individuals with R117H/C. All individuals with R117H/C known to CF clinics in Australia and New Zealand were retrospectively studied by collecting information on genotype, age, pancreatic status, sweat electrolytes, sputum microbiology and pulmonary function. Forty-one individuals (39 with R117H and two with R117C), 16 on an IVS8-5T background and 25 on an IVS8-7T background were identified. Twelve individuals presented clinically, four were siblings of known R117H/C compound heterozygotes and 25 were detected by newborn screening. Eleven of 14 of the IVS8-5T group (78%) with sweat chloride results available had sweat CI > 60 mmol x L(-1) compared to 5 (20%) of the R117H/7T group (Chi-squared=10.4, p=0.001). Two were pancreatic insufficient, both IVS8-5T. Two IVS8-5T individuals have recently died (aged 43 and 19) and of the 14 surviving IVS8-5T group, 11 (79%) are symptomatic compared to eight (32%) of the IVS8-7T individuals (Chi-squared=6.1, p=0.01). In conclusion, most individuals with R117H/C on a IVS8-5T background have an elevated sweat chloride and clinical cystic fibrosis, which in some cases is severe. Most individuals with R117H/C on an IVS8-7T background do not have clinical cystic fibrosis but should be followed for the development of clinical disease.
Keywords: cystic fibrosis
Description: Copyright © ERS Journals Ltd 2001
DOI: 10.1183/09031936.01.00057001
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Appears in Collections:Aurora harvest
Paediatrics publications

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