Bacteria turn viruses into DNA-shuffling machines

Bacteria have repurposed viruses into gene-transfer agents (GTAs) that shuffle DNA among themselves, enabling horizontal gene transfer that can spread traits like antibiotic resistance. This process, detailed in a recent Nature Microbiology study, may offer new strategies to combat infectious diseases. GTAs, derived from ancient tailed phages, package random bacterial genes into virus-like particles that inject DNA into target cells. Producing cells burst and die altruistically, typically when nutrients are scarce or many relatives are nearby, allowing surviving cells to acquire new advantageous traits. Researchers have identified gene clusters controlling GTA release, including those spreading antibiotic-resistance genes. Understanding how populations select sacrificial cells could inspire novel methods to kill harmful bacteria and block resistance exchange, with broader biotech applications likely once fully understood.