Researchers surprised to find bacterial parasites behind rise of ‘super bugs’

phage

The researchers showed that, contrary to a dominant theory in the field of evolutionary microbiology, the process of adaptation and diversification in bacterial colonies doesn’t start from a homogenous clonal population. They were shocked to discover that the cause of much of the early adaptation wasn’t random point mutations. Instead, they found that phages, which we normally think of as bacterial parasites, are what gave the winning strains the evolutionary advantage early on.

When it comes to bacteria, a careful observer can track evolution in the span of a few days. Because of how quickly bacteria grow, it only takes days for bacterial strains to acquire new traits or develop resistance to antimicrobial drugs. The researchers liken the way bacterial infections present in the clinic to a movie played from the middle. Just as late-arriving moviegoers struggle to mentally reconstruct events that led to a scene unfolding in front of their eyes, physicians are forced to make treatment decisions based on a static snapshot of when a patient presents at a hospital. And just like at a movie theater, there is no way to rewind the film and check if their guess about the plot or the origin of the infection was right or wrong.

The new study shows that bacterial and phage evolution often go hand in hand, especially in the early stages of bacterial infection. This is a multi layered process in which phages and bacteria are joined in a chaotic dance, constantly interacting and co-evolving.When the scientists tracked changes in genetic sequences of six bacterial strains in a skin wound infection in pigs, they found that jumping of phages from one bacterial host to another was rampant—even clones that didn’t gain an evolutionary advantage had phages incorporated in their genomes. Most clones had more than one phage integrated in their genetic material—often there were two, three or even four phages in one bug.

Rampant prophage movement among transient competitors drives rapid adaptation during infection” Science Advances (2021). advances.sciencemag.org/lookup … .1126/sciadv.abh1489

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