A study published in Science (2018) identifies nine previously unknown anti-phage defense systems and one anti-plasmid system in microbial genomes. These systems are found in "defense islands" and are widespread in microbes, providing strong protection against foreign invaders. The research systematically characterized gene families clustered near known defense genes in prokaryotic genomes, engineered and validated these systems in model bacteria, and found that some systems utilize components of bacterial flagella and condensin complexes. The study also suggests a common ancestry of innate immunity components among animals, plants, and bacteria. The newly discovered systems include Zorya, Thoeris, and Druantia, each with unique mechanisms of action. The Zorya system, for example, uses a proton channel to defend against phages, while the Thoeris system, which contains a TIR domain, is involved in recognizing phage patterns. The Druantia system, a large gene with unknown function, may have a complex defense mechanism. The Wadjet system, which is common in microbial genomes, was found to target foreign plasmids. The study also highlights the importance of understanding these defense systems for biotechnology and genome editing. The research provides insights into the evolution and function of microbial defense mechanisms, and the newly identified systems may have potential applications in molecular biology and biotechnology.A study published in Science (2018) identifies nine previously unknown anti-phage defense systems and one anti-plasmid system in microbial genomes. These systems are found in "defense islands" and are widespread in microbes, providing strong protection against foreign invaders. The research systematically characterized gene families clustered near known defense genes in prokaryotic genomes, engineered and validated these systems in model bacteria, and found that some systems utilize components of bacterial flagella and condensin complexes. The study also suggests a common ancestry of innate immunity components among animals, plants, and bacteria. The newly discovered systems include Zorya, Thoeris, and Druantia, each with unique mechanisms of action. The Zorya system, for example, uses a proton channel to defend against phages, while the Thoeris system, which contains a TIR domain, is involved in recognizing phage patterns. The Druantia system, a large gene with unknown function, may have a complex defense mechanism. The Wadjet system, which is common in microbial genomes, was found to target foreign plasmids. The study also highlights the importance of understanding these defense systems for biotechnology and genome editing. The research provides insights into the evolution and function of microbial defense mechanisms, and the newly identified systems may have potential applications in molecular biology and biotechnology.