Scientists discover bacteria can “explode” to spread antibiotic resistance

Researchers identify a genetic 'detonator' that causes bacteria to burst, releasing particles that spread antibiotic resistance genes to neighboring cells. | Contesto: cronaca

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• Scientists discover bacteria can “explode” to spread antibiotic resistance

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Scientists have discovered a startling new mechanism by which bacteria spread antibiotic resistance, finding that certain cells are programmed to explode, releasing virus-like particles packed with genetic material. The research, published this week, identifies a precise genetic trigger—a three-gene hub named LypABC—that controls this self-destructive act, fundamentally altering our understanding of horizontal gene transfer in microbial communities. This process, observed in laboratory models, represents a sophisticated, altruistic strategy where a subset of bacterial cells sacrifice themselves to enhance the genetic arsenal of their population. The delivery vehicles at the heart of this discovery are known as gene transfer agents (GTAs). These are not typical viruses but are instead remnants of ancient viral infections that bacteria have co-opted and domesticated over evolutionary time. Unlike infectious viruses that replicate selfishly, GTAs are produced by the host bacterium specifically to package random fragments of its own DNA. They then ferry this genetic cargo—which can include genes for virulence, metabolism, and critically, antibiotic resistance—to neighboring bacterial cells. This system acts as a rapid, inter-bacterial messaging service, allowing for the swift exchange of survival traits without the need for reproduction. The breakthrough of the new study lies in pinpointing the molecular switch that initiates the GTA production cycle. The LypABC gene complex acts as a master regulator. When activated, it sets in motion a cascade of events that culminates in the bacterial cell lysing, or bursting open. This controlled explosion is the essential step that releases the manufactured GTAs into the environment, enabling them to infect nearby cells and insert their DNA payloads. The identification of this specific trigger provides a clear target for future research aimed at disrupting this dangerous form of genetic sharing. This finding has profound implications for the global fight against antimicrobial resistance (AMR). The spread of resistance genes via GTAs is particularly concerning because it occurs rapidly and between different species of bacteria,...

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Categoria: cronaca