This Week in PNAS

In the PNAS Early Edition this week, investigators in Japan show that miR-33, encoded by an intron of Srebp2, regulates HDL cholesterol in vivo. Using miR-33-deficient mice, the team found that "miR-33 repressed the expression of ATP-binding cassette transporter A1 protein, a key regulator of HDL synthesis, by mediating cholesterol efflux from cells to apolipoprotein A-I," they write.

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The New York Times and ProPublica say that many physicians fail to disclose their financial ties when publishing in medical journals.

The Wall Street Journal reports Human Longevity's valuation has dropped by 80 percent.

Science reports that the US National Cancer Institute is cutting its operating budget by 5 percent.

In PLOS this week: similar variants seen in bullbogs, people with Robinow syndrome; ApoE genotypes in African-American, Puerto Rican populations; and more.