This Week in Nature

In this week's Nature, researchers from Washington University report on the discovery of a new genetic risk variant for Alzheimer's disease. The team conducted whole-exome sequencing on DNA from 29 affected individuals and 11 unaffected people, from 14 families with histories of late-onset Alzheimer's disease. It discovered a rare variant in the phospholipase D3, or PLD3, gene that was associated with a significantly greater risk of the disease.

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The Seattle Times writes that pharmacogenomics testing can help choose medications that may work best for people with depression.

Researchers report that deleting one gene from butterflies affects their wing coloration patterns, according to the Washington Post.

In PNAS this week: genome sequencing of weevil symbionts, retinoid X receptor deletion in lung cancer metastasis, and more.

Sequencing could help combat foodborne illnesses, according to a blog post by Food and Drug Administration officials.