Nature Communications (Feb 2016)
Major bacterial lineages are essentially devoid of CRISPR-Cas viral defence systems
Abstract
It is thought that CRISPR-Cas systems, which confer acquired immunity to phage and archaeal viruses, are widespread among bacteria and archaea. Here, Burstein et al.show that entire lineages of uncultivated microorganisms are essentially devoid of CRISPR-Cas systems.