A large deletion causes apparent homozygosity for the D1152H mutation in the cystic fibrosis transmembrane regulator (CFTR) gene |
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Authors: | Diana Anna Tesse Riccardina Polizzi Angela M Santostasi Teresa Manca Antonio Leonetti Giuseppina Seia Manuela Porcaro Luigi Cavallo Luciano |
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Affiliation: | Department of Biomedicine of the Developing Age, Apulian Referral Center for Cystic Fibrosis, Policlinico, University of Bari, Bari, Italy. diana_anna@libero.it |
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Abstract: | We report the case of a patient with an apparent homozygosity for the D1152H mutation located in exon 18 of the cystic fibrosis transmembrane conductance regulator (CFTR) gene. The parents had no personal history of cystic fibrosis (CF) and referred to our laboratory after the diagnosis of fetal bowel hyperechogenicity. The proband presented with meconium ileus and normal sweat chloride test. Sequencing of the CFTR exon 18 together with quantitative genomic assays, such as real-time PCR and the multiplex ligation probe amplification (MLPA) techniques, were performed and revealed that the father was heterozygous for the D1152H mutation and the mother carried a large deletion of the CFTR gene encompassing the genomic sequence including the same mutation. The child inherited D1152H from his father and the large deletion of the CFTR gene from his mother. We suggest that D1152H likely acts as a mild mutation with a dominant effect on the severe deletion of exon 18, considering that after 3 years of clinical examinations the child shows no classical signs and symptoms of CF. Not testing for large deletions in subjects with apparent homozygosity for a mutated CFTR allele could lead to the misidentification of CFTR mutation carrier status. |
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Keywords: | CF, cystic fibrosis CFTR, cystic fibrosis transmembrane conductance regulator MI, meconium ileus PI, pancreatic insufficiency UPD7, uniparental disomy for chromosome 7 RDB, reverse dot blot DGGE, denaturing gradient gel electrophoresis PCR, polymerase chain reaction MLPA, multiplex ligation probe amplification CBAVD, congenital bilateral absence of vas deferens DHPLC, denaturing high-performance liquid chromatography |
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