The CFTR frameshift mutation 3905insT and its effect at transcript and protein level

European Journal of Human Genetics : EJHG
Javier SanzSabina Gallati

Abstract

Cystic fibrosis (CF) is one of the most common genetic diseases in the Caucasian population and is characterized by chronic obstructive pulmonary disease, exocrine pancreatic insufficiency, and elevation of sodium and chloride concentrations in the sweat and infertility in men. The disease is caused by mutations in the CF transmembrane conductance regulator (CFTR) gene, which encodes a protein that functions as chloride channel at the apical membrane of different epithelia. Owing to the high genotypic and phenotypic disease heterogeneity, effects and consequences of the majority of the CFTR mutations have not yet been studied. Recently, the frameshift mutation 3905insT was identified as the second most frequent mutation in the Swiss population and found to be associated with a severe phenotype. The frameshift mutation produces a premature termination codon (PTC) in exon 20, and transcripts bearing this PTC are potential targets for degradation through nonsense-mediated mRNA decay (NMD) and/or for exon skipping through nonsense-associated alternative splicing (NAS). Using RT-PCR analysis in lymphocytes and different tissue types from patients carrying the mutation, we showed that the PTC introduced by the mutation does neither e...Continue Reading

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Related Concepts

CFTR protein, human
Pulmonary Cystic Fibrosis
Lymphoid Cells
RNA
Poly(A) Tail
Transcription, Genetic
Protein Biosynthesis
Out-of-Frame Deletion
Deletion Mutation
cDNA Probes

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