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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US News & World Report writes that genetic testing of lung tumors can help identify treatments for patients.

A team of researchers plans to sample Loch Ness for environmental DNA, according to Newsweek.

The New York Times writes about the appearance of mosaicism in healthy people.

In PNAS this week: insecticide resistance patterns Anopheles gambiae mosquito, transcriptome patterns in Pseudomonas aeruginosa during infection, and more.