This Week in PNAS

Researchers from Yale University and elsewhere report in the Proceedings of the National Academy of Sciences this week that Hydra contain two PIWI proteins that are expressed in Hydra stem/progenitor cells, though not in differentiated cells. By sequencing piRNAs that bind to either Hywi or Hyli and mapping them to the Hydra transcriptome, they further found that piRNAs, especially ones expressed in interstitial lineage, are enriched for transposon transcripts.

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

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

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.