This Week in PLOS

A sociogenomic study of fire ants in PLOS Genetics suggests the insect's gene expression shifts more dramatically in response to its social environment than its social rank. Using a whole-genome array, a team from the US and Switzerland assessed gene expression patterns in Solenopsis invicta fire ants as they established new colonies.

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Direct-to-consumer genetic testing companies have offered to test families separated at the southern US border, but that raises ethical issues.

CNBC reports that confirming a positive result from 23andMe's BRCA health report can be expensive.

The New York Times reports on a project to develop a tree DNA database to uncover illegal logging.

In PLOS this week: links between gut microbiome and colorectal cancer mutations, targeted sequencing uncovers genetic susceptibilities to epilepsy in Koreans, and more.