This Week in PNAS

In a paper appearing in this week's Early Edition, researchers at Johns Hopkins University School of Medicine and at the University of California, Irvine, show that deletion of Lhx2 in aging mice induces constitutive reactive gliosis, which then reduces "rates of ongoing apoptosis and compromised both rod and cone photoreceptor function." The Hopkins-Irvine team adds that these animals also "showed a dramatically reduced ability to induce expression of secreted neuroprotective factors and displayed enhanced rates of apoptosis in light-damage assays." Overall, the researchers say their study

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Labs in the US and South Korea are hoping to bring the woolly mammoth back from beyond extinction, Newsweek writes.

Geneticist Adam Rutherford speaks with National Geographic about paleogenetics, race, and more.

Researchers link genetic links between education and smoking and longevity.

In PNAS this week: influence of gene environment interactions on polygenic traits, epigenetic features affecting fruit fly foraging, and more.