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Discovery reveals how bacteria distinguish harmful vs. helpful viruses
Date:8/31/2014

their hypothesis that the Staphylococcal CRISPR-Cas system, known as Type III-A, can tolerate an infection by a lysogenic virus, so long as the target sequences are not transcribed. They engineered a target sequence that would undergo transcription only in the presence of a specific chemical. As a result, the Type III-A CRISPR-Cas system only destroyed the target in the presence of this chemical.

"This discovery of a transcription requirement is likely to surprise many who work with these systems," Marraffini says. "Although we do not yet understand the mechanism behind it, we can say that the Type -III-A system is quite different from other CRISPR-Cas systems, of which there is a mysteriously large variety. Our discovery hints at the possibility that each CRISPR type and subtype recognizes and destroys its targets in different ways, each in tune with a particular bacterium's needs. If these different targeting mechanisms do exist, they could have important implications for biotechnology."


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Contact: Zach Veilleux
veillez@rockefeller.edu
212-327-8982
Rockefeller University
Source:Eurekalert  

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