The gut microbiome may be a causal factor of kwashiorkor, a form of severe malnutrition, researchers from Washington University in St. Louis report in Science. WashU's Jeffrey Gordon and his colleagues studied the gut microbiomes of 317 Malawian twin pairs until they turned three. They then focused on nine, well-nourished, same-gender twin pairs and 13 same-gender twin pairs in which one twin developed kwashiorkor.

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The US Food and Drug Administration has new guidelines that enable some gene and cell therapies to undergo expedited review, according to the New York Times.

Using gene drives to control invasive species might be too risky, an initial advocate of the approach says.

In Science this week: intellectual property experts argue patent battles such as the one over CRISPR are wasteful, and more.

Researchers have grown tumors in 3D cell cultures to better understand cancer, the Economist reports.