This deletion results in a polypeptide missing an amino acid. Cystic fibrosis is a genetic disease that affects mostly the lungs, but also other organs such as the pancreas and the liver. It is caused by a mutation in the gene cystic fibrosis transmembrane conductance regulator (CFTR). This mutation is a deletion of three nucleotides that cause the loss of the amino acid phenylalanine.
While researchers have discovered that there are an excessive number of receptor sites for dopamine, it is not the only neurotransmitter involved in schizophrenia.