Researchers from Isis Pharmaceuticals this week reported in vitro evidence on the existence of a new class of siRNA, which can promote target RNA reduction independent of both Argonaute and RISC.

The authors of the study, which appeared in Nucleic Acids Research, caution that much work remains to be done before the significance of these siRNAs can be established, however.

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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.