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They're Not All Good

In a recent study, scientists at the Department of Veterans Affairs Medical Center in Oklahoma City found that Enterococcus faecalis bacteria living in the gut can damage DNA and up gene expression linked to colon cancer, reports the BBC. They exposed colon cells in vitro to the bacterium and found that when it was in a "fermentation state," it produced a "superoxide" molecule that could damage DNA in surrounding cells. They also found that expression of 42 genes linked to vital processes in human cells was altered by the presence of E. faecalis. But, says the University of Liverpool's Barry Campbell, a gut microbiology researcher, "There are also many other factors which are involved, such as genetics and environment."

The Scan

Could Cost Billions

NBC News reports that the new Alzheimer's disease drug from Biogen could cost Medicare in the US billions of dollars.

Not Quite Sent

The Biden Administration likely won't meet its goal of sending 80 million SARS-CoV-2 vaccine doses abroad by the end of the month, according to the Washington Post.

DTC Regulation Proposals

A new report calls on UK policymakers to review direct-to-consumer genetic testing regulations, the Independent reports.

PNAS Papers on Mosquito MicroRNAs, Acute Kidney Injury, Trichothiodystrophy

In PNAS this week: microRNAs involved in Aedes aegypti reproduction, proximal tubule cell response to kidney injury, and more.