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A simple glitch in the DNA code turns an unassuming gene into a deadly killer. It passes from parent to child, has been subject to huge stigma, and for many has been a dark family secret. Dr Kat Arney speaks to Alice Wexler, author of “The Woman Who Walked into the Sea: Huntington's and the Making of a Genetic Disease”, whose family uncovered the secrets of the Huntington’s gene, and Dr Sarah Tabrizi, who’s leading the hunt for a cure. Presenter: Kat Arney Producer: Beth Sagar-Fenton Sound Mix: James Beard Editor: Penny Murphy