This Week in PNAS

In this week's PNAS Early Edition, a public-private research consortium of investigators at plant research institutes as well as beer and whiskey producers across Europe reports its mapping of 15 traits across about 500 barley crop cultivars genotyped with more than 1,500 SNPs. The team found "high levels of linkage disequilibrium within and between chromosomes" and "common alleles of high penetrance" across the cultivars.

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23andMe's Anne Wojcicki ponders DNA and what it means to be human in a New York Times essay.

A new estimate places the last universal common ancestor to life on Earth as living 3.9 billion years ago, Inverse reports.

In PNAS this week: retinitis pigmentosa gene therapy, role of microbiome in growth stunting, and more.

Bloomberg reports that researchers and drug companies are modeling anti-obesity treatments after the rare genetic condition essential fructosuria.