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Molecular mechanisms of CRISPR–Cas spacer acquisition
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Molecular mechanisms of CRISPR–Cas spacer acquisition
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Molecular mechanisms of CRISPR–Cas spacer acquisition
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Journal Article
Molecular mechanisms of CRISPR–Cas spacer acquisition
2019
Overview
Many bacteria and archaea have the unique ability to heritably alter their genomes by incorporating small fragments of foreign DNA, called spacers, into CRISPR loci. Once transcribed and processed into individual CRISPR RNAs, spacer sequences guide Cas effector nucleases to destroy complementary, invading nucleic acids. Collectively, these two processes are known as the CRISPR–Cas immune response. In this Progress article, we review recent studies that have advanced our understanding of the molecular mechanisms underlying spacer acquisition and that have revealed a fundamental link between the two phases of CRISPR immunity that ensures optimal immunity from newly acquired spacers. Finally, we highlight important open questions and discuss the potential basic and applied impact of spacer acquisition research.
