NEW YORK, Oct. 23 – DeCode Genetics has used data gleaned from its population genomics research of patients in Iceland with Parkinson’s disease to map the first gene linked to the main form of the disease, the company said on Tuesday.

The next step, the firm said, is to develop DNA-based diagnostics and drugs to treat the disorder.

The discovery also served to challenge the widely held notion that there is no identifiable genetic component that contributes to the development 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.