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This Week in PNAS

In work published in the early online edition of PNAS this week, scientists study how evolutionary selection affects modes of gene regulation. Using a model that takes into account genetic drift, mutation, and time-dependent selection, they found the "effective population size and the typical time scale of environmental variations to be key parameters determining the fitness advantage of the different modes of regulation," they say in the abstract.

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The Washington Post reports that the US Department of Agriculture told its researchers to label peer-reviewed articles as "preliminary" work.

Australia will not be regulating gene editing of plants, animals, and human cell lines as long as no new genetic material is incorporated, reports Nature News.

Researchers have sequenced the genomes of both the coast redwood and the giant sequoia, according to the San Francisco Chronicle.

In PNAS this week: study of epigenetic patterns in mammalian eggs, clonal expansion patterns in CD8+ T cells, and more.