Study of SKY-0515 for Safety, Efficacy, and Pharmacodynamics in Participants With Huntington's Disease

Inclusion Criteria: * You must be 25 years or older. * You must have Huntington's Disease confirmed through genetic testing, with a specific gene change (CAG repeat of 40 or more). * Total Functional Capacity (TFC) score of 10 or more). * Total Motor Score (TMS) of 6 or more). * Independence Score (IS) of 70 or more). * Women who can have children must have a negative pregnancy test before starting and use two types of birth control during the study and for 30 days after the last dose of the study drug. * Men must agree to use birth control during the study and for 90 days after the last dose. * You must agree to sign a consent form and follow the study's rules and schedule. Exclusion Criteria: * You have other serious health problems or brain/spinal issues that could interfere with the study or make procedures unsafe. * You have a condition that interferes with protocol-specified assessments, like an implanted medical device or difficulty getting an MRI. * You have cancer, except for some types of skin cancer, or a history of cancer in the last five years. * You have severe allergies or have reacted badly to similar drugs in the past. * You are taking medications or treatments that might interfere with the study. * You've been in another study or taken experimental drugs in the last two months (or longer for some drugs). * You have had any kind of gene therapy. * You have a history of suicidal thoughts, severe depression, or have attempted suicide in the past year. * Your…