CFTR is the name commonly given to the gene responsible for the production of the Cystic Fibrosis Transmembrane Regulator protein. This gene, when mutated, can cause cystic fibrosis, although it is recessive, whether the mutations are identical or not. So far, over 1500 mutations of the CFTR gene have been discovered, sometimes in as few as one individual.
CFTR is a member of the ABC superfamily of proteins and is the only Cl- channel in this family. It is very similar to P-glycoprotein.