Abstract
Cystic fibrosis remains the commonest semilethal inherited disease in the Caucasian population. The disease is characterized by dysfunction of exocrine glands with disturbances of electrolyte and mucus secretion, resulting in multiorgan involvement by predominantly obstructive lesions. The gene was localized to the long arm of chromosome 7 in September 1989 in a landmark discovery by the team of Lap-Chee Tsui, Jack Riordan, and Francis Collins at the Universities of Toronto and Michigan. The major mutation associated with the severe multi-organ form of the disease results in the deletion of a phenylalanine residue at position AF508 and is found in 70% of North American Caucasian CF patients.1 There are now upwards of 150 mutations of various kinds identified as causing CF, most occurring in the nucleotide binding domain of the cystic fibrosis transmembrane regulator (CFTR), the protein product of the gene. It is likely that the CFTR is either a chloride channel itself, or regulates another protein which transports chloride in response to intracellular stimuli such as raised cAMP levels and protein kinase activity. Thus, the defect appears to involve abnormal phosphorylation of a protein necessary in the gating mechanism of the chloride channel.2
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References
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Smith, L., Weber, A., Roy, C.C. (1992). Gastrointestinal and Hepatobiliary Complications of Cystic Fibrosis. In: Thomson, A.B.R., Shaffer, E. (eds) Modern Concepts in Gastroenterology. Topics in Gastroenterology. Springer, Boston, MA. https://doi.org/10.1007/978-1-4615-3314-6_16
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