Nephronophthisis 20, also known as nphp20, is related to joubert syndrome 21 and nephronophthisis 15. An important gene associated with Nephronophthisis 20 is MAPKBP1 (Mitogen-Activated Protein Kinase Binding Protein 1), and among its related pathways/superpathways are Organelle biogenesis and maintenance and Ciliary landscape. Affiliated tissues include liver and kidney, and related phenotypes are renal insufficiency and nephronophthisis