This Week in PNAS

In a paper in the Proceedings of the National Academy of Sciences this week, scientists at CNRS in Paris have used network analysis to study the structure and evolution of genetic diversity. Studying about 119,000 homologous DNA families taken from 111 cellular genomes and 165,529 phage, plasmid, and environmental virome sequences, they found that plasmids, not viruses, were "key vectors of genetic exchange between bacterial chromosomes, both recently and in the past," they say.

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Senator Elizabeth Warren (D-Mass.) has released the results of a genetic ancestry analysis, the Boston Globe reports.

Retraction Watch's Ivan Oransky and Adam Marcus report that Harvard Medical School and Brigham and Women's Hospital have recommended that more than 30 papers from a former researcher be retracted.

Thomas Steitz, who won the 2009 chemistry Nobel Prize for his ribosome work, has died, the Washington Post reports.

In PLOS this week: mechanisms for genes implicated in coronary artery disease, rumen microbes and host genetics influence cow methane production, and more.