Researchers have found a link between the methylation state of rRNA genes in the hippocampus and suicide, reports The Scientist. People who committed suicide had highly methylated rRNA genes as compared to healthy brains, but only in the region that regulates stress hormones. The researchers, led by McGill University's Moshe Szyf, then compared the brains of suicide victims who had been abused as children to those who had not and found that the methylation patterns differed.

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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.