(Graphic) K. Franklin/Science
Those databases will illuminate studies of human variation worldwide, in part because the great genomic diversity in Africans can uncover spurious links to medical conditions, explains Concepcion Nierras, an NIH Common Fund geneticist. For example, in Europeans a rare variant of a gene for a low-density lipoprotein that contributes to high cholesterol seemed to raise the risk of heart disease. But Fatumo and his colleagues found that among Africans, the variant was common even in those who did not have heart disease, suggesting it may not have clinical relevance. The
Nature paper uncovered 54 such variants that now need re-evaluation.