For years, Alexis Beery, 15, relied on daily doses of an incredibly potent inhalant and injections of adrenaline just to stay alive. Now she and her similarly sick twin brother, Noah, have gone from racing to the ER on a regular basis to racing to high-school track and volleyball practice — thanks to treatment designed specifically for their unique genetic makeup. Gene-specific treatments have been used for years for a handful of diseases. Women with breast cancer who are found to carry the BRCA1 or BRCA2 genetic mutation, for instance, can undergo a regimen tailored for that specific gene mutation....