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A new, more diverse human genome offers hope for rare genetic diseases

Cornell Steele and Teresa Cruz-Steele care for their daughter Celia, who has a rare genetic condition that affects her ability to walk and talk. Washington Post photo by Carolyn Van Houten.
Washington Post
Mark Johnson

The landmark deciphering of the human genome more than two decades ago allowed doctors to solve thousands of medicine’s cruelest mysteries, including the reason 10-year-old Celia Steele has never walked or talked, and now needs tubes to deliver oxygen and food. Deep in the genetic blueprint of the Wichita girl, doctors discovered the cause: two mutations…