How an Extreme Athlete Uncovered Her Own Genetic Flaw

When Kim Goodsell discovered that she had two extremely rare genetic diseases, she taught herself genetics to help find out why. This is a new story of mine, published concurrently in Mosaic, Pacific Standard, BBC Future, and more.

Kim Goodsell was running along a mountain trail when her left ankle began turning inward, unbidden. A few weeks later she started having trouble lifting her feet properly near the end of her runs, and her toes would scuff the ground. Her back started to ache, and then her joints too.

This was in 2002, and Kim, then 44 years old, was already an accomplished endurance athlete. She ...

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