Observational StudyPrescreening Study to Identify Potential Wilson Disease Participants for Gene-Editing Clinical Trial

Inclusion Criteria:

• Confirmed Wilson Disease (WD) as determined by the following criteria:

1. An established clinical diagnosis of WD
2. Genetic analysis confirming the presence of biallelic pathogenic variants at ATP7B, at least one of which is EITHER p.H1069Q OR p.R778L OR Participants without a confirmed genetic diagnosis may enroll only with explicit approval from the Medical Monitor

Exclusion Criteria:

1. Prior history of gene therapy, liver transplantation, hepatocyte (cellular) transplantation, or active listing for liver transplantation
2. For individuals with known ATP7B genotype: individual does not have at least 1 ATP7B allele with either the p.H1069Q or p.R778L mutation.
3. Significant neurological conditions within the prior 12 months which may impact participant safety or participation in the study, including ability to complete study requirements or procedures as outlined in the clinical study protocol.
4. In patients with psychiatric involvement, current or fluctuant clinical instability with new or changing diagnoses or substantial medication regimen changes in the past 12 months that could limit their participation, in the opinion of the Investigator.
5. History of cirrhotic decompensation within the past year.
6. Any other condition that, in the opinion of the Investigator, may compromise the safety or compliance of the participant or would preclude the participant from successful study completion, including participant unable or unwilling to comply with the protocol requirements.
7. Current participation in an investigational study for the treatment of WD.
8. Prior or active malignancy or myeloproliferative disorder (excluding Stage 1 or lower, fully treated/excised malignant and pre-malignant disease of the skin, cervix or colon. Additionally, any other malignant and pre-malignant disease that the Investigator in consultation with the treating oncologist and study Medical Monitor deem has been fully treated/excised for > 5 years).