Researchers have shown that there is substantial genetic variation between ethnic groups in Mexico. Generations of geographic separation have fostered differences between populations, and the data have allowed the authors to come to interesting and medically relevant conclusions. First, the variation has made it possible to genetically map historical movements between the populations. Mexican history has, for many Mexican residents, generated a medley of ancestry including indigenous, European and African descent. Second, understanding this variation and its sources allows doctors to know genetic risks for the relevant populations. For example, the researchers identified a gene variant that affects lung function, and there are direct diagnostic implications.
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