Vertebral, Cardiac, Renal, and Limb Defects Syndrome 1, also known as congenital nad deficiency disorder 1, is related to vertebral, cardiac, renal, and limb defects syndrome 2 and vertebral, cardiac, renal, and limb defects syndrome 3. An important gene associated with Vertebral, Cardiac, Renal, and Limb Defects Syndrome 1 is HAAO (3-Hydroxyanthranilate 3,4-Dioxygenase). Affiliated tissues include trachea and heart, and related phenotypes are microcephaly and sensorineural hearing impairment