The physicist's guide to one of biotechnology's hottest new topics: CRISPR-Cas

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Abstract
Clustered regularly interspaced short palindromic repeats (CRISPR) and CRISPR-associated proteins (Cas) constitute a multi-functional, constantly evolving immune system in bacteria and archaea cells. A heritable, molecular memory is generated of phage, plasmids, or other mobile genetic elements that attempt to attack the cell. This memory is used to recognize and interfere with subsequent invasions from the same genetic elements. This versatile prokaryotic tool has also been used to advance applications in biotechnology. Here we review a large body of CRISPR-Cas research to explore themes of evolution and selection, population dynamics, horizontal gene transfer, specific and cross-reactive interactions, cost and regulation, as well as non-defensive CRISPR functions that boost host cell robustness. Physical understanding of the CRISPR-Cas system will advance applications, such as efficient and specific genetic engineering, cell labeling and information storage, and combating antibiotic resistance.

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