AI Insight
Two new studies published in Science reveal the discovery of an RNA-guided system in viruses that appears to be an evolutionary precursor to CRISPR. While CRISPR has functioned as a bacterial immune defense system for billions of years, this newly identified viral system suggests that the mechanism originated in viruses before being adopted by bacteria. This finding challenges the previous understanding of CRISPR's evolutionary origins and reveals a longer history of RNA-guided genetic systems.
Why it matters
The discovery of CRISPR's viral ancestor could expand the gene-editing toolkit by providing new molecular mechanisms and alternative approaches to genetic modification. Understanding the evolutionary relationship between viral and bacterial RNA-guided systems may lead to the development of novel gene-editing technologies with different capabilities or advantages over current CRISPR-based methods.
Understand the Science
CRISPR may be a powerful technology for gene editing, but the system existed in bacteria long before scientists began using it. For billions of years, CRISPR has acted as a natural immune system in bacteria and other microbes, helping defend them against invading viruses. But now, two new studies, published in Science, describe a similar RNA-guided system that originated in the viruses themselves and appears to be a precursor to CRISPR.
Source: Discovery of CRISPR's long lost ancestor may expand gene-editing toolkit