Arthrogryposis, Perthes Disease, and Upward Gaze Palsy, also known as apug, is related to legg-calve-perthes disease and papillon-lefevre syndrome. An important gene associated with Arthrogryposis, Perthes Disease, and Upward Gaze Palsy is NEK9 (NIMA Related Kinase 9). Related phenotypes are asthma and arthrogryposis multiplex congenita