The iron overload disease hemochromatosis is caused by a mutation in the HFE gene that originated only recently and that is now most common in:

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This mutation is believed to be about 2000 to 4000 years old, and it appeared in either a Celtic or a Viking population.Because of its recent origin, the mutation still has a rather restricted geographic distribution.

The Iron Overload Disease Hemochromatosis Is Caused by a Mutation