Why study disease in different populations?

Although Latinos do have some European ancestry, this is highly variable in each person, even within the same country. In fact, fast-forwarding a few years, studies done on the patients of these same clinicians showed that the frequency of mutations in LRRK2 is highly linked to the amount of European ancestry that each country has on average, with countries like Peru that has the least amount of European genetic material, having the lowest frequency.