A Tiny But Efficient Cas Protein is Discovered in a Bacteriophage

The microbes of the world are locked in a struggle for survival and a battle for resources. They can compete directly in different ways; there are viruses that can infect bacteria, called bacteriophages, and bacterial defense mechanisms that can cut up viral DNA. The gene-editing tool CRISPR-Cas9 is derived from a kind of bacterial immune system. As research on CRISPR has expanded, scientists have looked to other bacteria and found different kinds of Cas proteins that can cut DNA as well as RNA. Now scientists have identified a new kind of Cas protein in bacteriophages.

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