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Cloaked DNA nanodevices survive pilot mission
Date:4/22/2014

It's a familiar trope in science fiction: In enemy territory, activate your cloaking device. And real-world viruses use similar tactics to make themselves invisible to the immune system. Now scientists at Harvard's Wyss Institute for Biologically Inspired Engineering have mimicked these viral tactics to build the first DNA nanodevices that survive the body's immune defenses.

The results pave the way for smart DNA nanorobots that could use logic to diagnose cancer earlier and more accurately than doctors can today; target drugs to tumors, or even manufacture drugs on the spot to cripple cancer, the researchers report in the April 22 online issue of ACS Nano.

"We're mimicking virus functionality to eventually build therapeutics that specifically target cells," said Wyss Institute Core Faculty member William Shih, Ph.D., the paper's senior author. Shih is also an Associate Professor of Biological Chemistry and Molecular Pharmacology at Harvard Medical School and Associate Professor of Cancer Biology at the Dana-Farber Cancer Institute.

The same cloaking strategy could also be used to make artificial microscopic containers called protocells that could act as biosensors to detect pathogens in food or toxic chemicals in drinking water.

DNA is well known for carrying genetic information, but Shih and other bioengineers are using it instead as a building material. To do this, they use DNA origami -- a method Shih helped extend from 2D to 3D. In this method, scientists take a long strand of DNA and program it to fold into specific shapes, much as a single sheet of paper is folded to create various shapes in the traditional Japanese art.

Shih's team assembles these shapes to build DNA nanoscale devices that might one day be as complex as the molecular machinery found in cells. For example, they are developing methods to build DNA into tiny robots that sense their environment, calculate how to respond, then carry out
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Contact: Dan Ferber
dan.ferber@wyss.harvard.edu
617-432-1547
Wyss Institute for Biologically Inspired Engineering at Harvard
Source:Eurekalert  

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