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Long noncoding RNAs control development of fat cells
Date:2/13/2013

CAMBRIDGE, Mass. (February 13, 2013) Whitehead Institute researchers have identified a previously unrecognized layer of genetic regulation that is necessary for the generation of undesirable white fat cells. When this regulation is disrupted, white fat cells are unable to accumulate lipid droplets or mature from their precursors.

"We're trying to figure out what the mechanism iswhat it takes to make fat cells," says Whitehead Founding Member Harvey Lodish, who is also a professor of biology and a professor of bioengineering at MIT. "The obvious reason we're interested in this is because a lot of people have too many of them."

According to the Centers for Disease Control and Prevention, obesityhaving a body mass index (BMI) of 30 or higheris a serious healthcare and economic problem in the United States. More than one-third of American adults are obese, a condition that can lead to heart disease, type 2 diabetes, and stroke. In 2008 obesity-related issues were estimated to cost $147 billion.

All of these problems are caused by an overabundance of white fat cellsadipose tissue cells that store excess energy as fat or lipid droplets. Unlike white fat cells, brown fat cells, which are most prevalent in babies and have a reduced presence in adults, use lipids as fuel to maintain a stable, warm body temperature. Understanding how both types of fat cells are formed and maintained may one day lead to anti-obesity therapies.

In the quest to understand fat-cell generation and maintenance, the Lodish lab scanned mouse fat cells to determine which of the cells' long noncoding RNAs (lncRNAs) are active. Of the 175 identified, 10 lncRNAs were found to play significant roles in these cells.

Residing within what was once dubbed "junk DNA", lncRNAs have recently gained fame as important gene expression regulators that modify chromatin, enhance transcription, and promote messenger RNA (mRNA) degradation, as well as through other meth
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Contact: Nicole Rura
rura@wi.mit.edu
617-258-6851
Whitehead Institute for Biomedical Research
Source:Eurekalert

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