An experimental drug is drawing widespread attention for its potential to treat Huntington’s disease. The gene therapy prevents mutant Huntington’s genes from essentially forcing cells to create toxic proteins that wreak havoc on the nervous system. This, in turn, could slow or even reverse the progressive motor and cognitive symptoms of Huntington’s. Additional trials are in the pipeline, and in the meantime patients, advocates, and researchers are cautiously optimistic about the promise of an historic new ally.