The CurePSP Genetics Program

Inclusion Criteria: 1. Adults (aged 35 or older) with a clinical diagnosis of PSP, CBS, MSA, or a related neurological disease as confirmed by their healthcare provider, or unaffected family members of participants who have reported a family history of relevant neurodegenerative conditions. 2. Meet Movement Disorder Society (MDS) Clinical Diagnostic Criteria for Possible or Probable PSP (32), clinically established or clinically probable MSA (33), Armstrong criteria (2013) for possible or probable CBS (34). Diagnostic certainty will be determined by the treating/referring clinician. 3. Willingness to undergo genetic testing. Participants will have the option to receive relevant genetic test results. 4. Have the capacity to give full informed consent in writing or electronically, or provide consent through a legally authorized representative (LAR)/power of attorney (POA), and have read, understood, and completed the informed consent form. 5. Are able to perform or have a designee who can perform study activities (including completion of either online or orally administered surveys). Exclusion Criteria: 1. Individuals who have received a blood transfusion within the past 3 months. 2. Individuals who have active hematologic malignancies such as lymphoma or leukemia. 3. Individuals who have had a bone marrow transplant within the past 5 years. 4. Individuals under the age of 35 or age of majority in applicable states at the time of consenting.