Adeno-Associated Virus (AAV) Antibody Study in Subjects OTC Deficiency, GSDIa, and Wilson Disease

Inclusion Criteria: * Diagnosis of OTC deficiency, GSDIa, or Wilson Disease. * Provide informed consent after the nature of the study has been explained, and prior to any research-related procedures. Exclusion Criteria: * Prior exposure to an AAV-based gene therapy. * Concurrent or previous participation in another Ultragenyx clinical study. * Recipient of a liver transplant. * Presence or history of any condition that, in the view of the Investigator, would interfere with participation, pose undue risk, or would confound interpretation of results.