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Bacteria make a beeline to escape tight spaces

Bacteria make a beeline to escape tight spaces

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Hardin Bitsky

Hardin Bitsky

Mr. Hardin, a future doctor of pharmacy, provides services as a content writer for scientific and technical niches.

A newly published study by researchers at the University of Hawai’i at Mānoa revealed that bacteria alter their swimming patterns when they get into tight spaces—making a beeline to escape from confinement.

Nearly all organisms host bacteria that live symbiotically on or within their bodies. The Hawaiian bobtail squid, Euprymna scolopes, forms an exclusive symbiotic relationship with the marine bacterium Vibrio fischeri which has a whip-like tail that it uses to swim to specific places in the squid’s body.

A research team, led by Jonathan Lynch, who was a postdoctoral fellow at the Pacific Biosciences Research Center (PBRC) at the UH Mānoa School of Ocean and Earth Science and Technology (SOEST), designed controlled chambers in which they could observe the Vibrio bacteria swimming. Using microscopy, the team discovered that as the bacteria moved between open areas and tight spaces they swim differently. Specifically, they change their swimming behavior to avoid getting stuck in confined spaces.

“This finding was quite surprising,” said Lynch, who is now a postdoctoral fellow at the University of California, Los Angeles. “At first, we were looking for how bacterial cells changed the shape of their tails when they moved into tight spaces, but discovered that we were having trouble actually finding cells in the tight spaces. After looking more closely, we figured out that it was because the bacteria were actively swimming out of the tight spaces, which we did not expect.”

In open spaces, without chemicals to be attracted to or repelled from, bacteria appeared to meander with no discernible pattern—changing direction randomly and at different points in time. Upon entry into confined spaces, the bacteria straightened their swimming paths to escape from confinement.

The relationship between the squid and this bacterium is a useful model of how bacteria live with other animals, such as the human microbiome. Microbes often traverse complicated routes, sometimes squeezing through tight spaces in tissues, before colonizing preferred sites in their host organism. A variety of chemicals and nutrients within hosts are known to guide bacteria toward their eventual destination. However, less is known about how physical features like walls, corners, and tight spaces affect bacterial swimming, despite the fact that these physical features are found across many bacteria-animal relationships.

“Our findings demonstrate that tight spaces may serve as an additional, crucial cue for bacteria while they navigate complex environments to enter specific habitats,” said Lynch. “Changing swimming patterns in tight spaces may allow some bacteria to quickly swim through the tight spaces to get to the other side, but for the others, they turn around before the get stuck—kind of like choosing whether to run across a rickety bridge or turn around before you go too far.”

In the future, the researchers hope to figure out how these bacteria are changing their swimming activity, as well as determining if other bacteria show the same behaviors.

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