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1 Cystic fibrosis primarily affects the lungs and digestive system. 2  It leads to the production of mucus that is much thicker and more sticky than usual. 3  Cystic fibrosis is a hereditary condition, caused by a defective gene. 4  The cystic fibrosis gene must be present in both parents for a child to have the condition.
CF is caused by a mutation in the gene cystic fibrosis transmembrane conductance regulator (CFTR). The most common mutation, Î´F508, is a deletion (Î´ signifying deletion) of three nucleotides that results in a loss of the amino acid phenylalanine (F) at the 508th position on the protein.he main signs and symptoms of cystic fibrosis are salty-tasting skin, poor growth, and poor weight gain despite normal food intake, accumulation of thick, sticky mucus, frequent chest infections, and coughing or shortness of breath.