For example, cystic fibrosis—the defect of the cystic fibrosis (CF) transmembrane conductance regulator (CFTR) genes—leads to the accumulation of succinate in the lungs, which favors the colonization and survival of P. aeruginosa, as this microorganism can utilize it as a nutrient source [40]. The gene discussed is CFTR; the disease is cystic fibrosis.