JUL 24, 2017 6:57 AM PDT

Life Can Adapt to Microgravity, Research Finds

WRITTEN BY: Anthony Bouchard

When life on Earth first began, it was rapidly evolving over the course of generations to keep up with the dynamic conditions of the planet.

With life's resilience fresh on the minds of researchers from the University of Houston in Texas, they decided to take things a step further and see whether life could adapt to survive in microgravity over the course of generations.

On the International Space Station, astronauts are subjected to microgravity. They come back to Earth with significant bodily changes.

Image Credit: Skeeze/Pixabay

In the journal npj Microgravity, the researchers describe the changes they observed as 1,000 generations of Escherichia coli (E. Coli) were subjected to simulated microgravity conditions right here on Earth.

While it’s difficult to replicate microgravity on Earth without blasting off into the cold vacuum of space, we can use the High Aspect Rotating Vessel (HARV) or parabolic flights to produce the “feeling” of free-fall and weightlessness without the costs associated with launching a rocket to the International Space Station.

Related: The International Space Station is a magnet for germs

The goal of the experiment was to learn whether the bacteria would undergo any kinds of genetic changes over the course of the several generations, and to their surprise, they found at least 16 genes having to do with biofilm production had been mutated after exposure to the rotating vessel method.

“When people are in a free fall, their first instinct is to grab onto something,” study lead author Madhan Tirumalai explained. “When bacteria are in conditions of microgravity, one can expect something similar to happen at the microscale level, which is to grab onto a substrate and to grab onto other bacteria.”

As it would appear, the simulated microgravity had a direct impact on these mutations. Combining to create a biofilm is just one way that bacteria can band together to increase the odds of survival in harsh conditions, like those found in space.

Related: Eradicating dangerous biofilms with enzymes

To ensure that the mutations were occurring for survival reasons, Tirumalai added a standard strain of E. Coli to the mutated strain inside of the rotating vessel to see how the common bacteria strain would compare in resilience to the mutated bacteria.

Unsurprisingly, the mutated bacteria was out-growing the common bacteria, which hints that the changes were a direct survival response to the simulated microgravity environment.

To find out whether the mutations were temporary or permanent, Tirumalai removed the mutated bacteria and grew it outside of the HARV. Some of the mutations seemed to disappear after just ten generations of exposure to Earth-like gravity again, which hinted that only some of the mutations were permanently etched into the DNA while transient gene expression caused the others.

“Evolution is a strangely complex phenomenon,” Tirumalai continued. “It’s difficult to predict. You can never know how many generations it would take for adaptations to become irreversible.”

The study has implications for the resilience of life in outer space. While it doesn’t prove that humans can magically evolve to survive long-term in microgravity by any stretch, it does show that life can adapt to some space-like conditions if necessary for survival.

Since long-term space missions will require humans to stay in spaceships for months or years at a time, a day could come where new generations will be born in space rather than on Earth. Understanding how and what resilient mutations are passed on from parent to offspring is essential if we are to get to that point.

There is still much more research to do before we start colonizing space, but it's a start.

Source: University of Houston

About the Author
  • Fascinated by scientific discoveries and media, Anthony found his way here at LabRoots, where he would be able to dabble in the two. Anthony is a technology junkie that has vast experience in computer systems and automobile mechanics, as opposite as those sound.
You May Also Like
NOV 17, 2020
Space & Astronomy
Researchers Find Human Brain Shares Structure with Universe
NOV 17, 2020
Researchers Find Human Brain Shares Structure with Universe
Astrophysicist Franco Vazza from the University of Bologna, and Alberto Felett, a neurosurgeon at the University of Vero ...
DEC 06, 2020
Space & Astronomy
Watching a Nebula Fade
DEC 06, 2020
Watching a Nebula Fade
Nebulas are vast clouds of dust and gas that are remnants of exploded stars or in other cases, nurseries for where stars ...
DEC 19, 2020
Chemistry & Physics
Advanced Chemistry Module to Aid Future Mars Exploration
DEC 19, 2020
Advanced Chemistry Module to Aid Future Mars Exploration
Despite its resemblance to Earth, Mars, our planetary neighbor, is not exactly a friendly environment for human explorer ...
DEC 29, 2020
Space & Astronomy
Why is the Sun's Outer Atmosphere Hotter than its Surface?
DEC 29, 2020
Why is the Sun's Outer Atmosphere Hotter than its Surface?
The fact that the Sun's distant atmosphere is significantly hotter than its surface has been a topic of confusion in ...
MAY 01, 2021
Space & Astronomy
Satellite Images Show Accelerating Retreat of World's Glaciers
MAY 01, 2021
Satellite Images Show Accelerating Retreat of World's Glaciers
In a new study, an international team of researchers have found that almost all of the world’s glaciers are in ret ...
MAY 23, 2021
Space & Astronomy
Why Do Some Stars Vanish from Space?
MAY 23, 2021
Why Do Some Stars Vanish from Space?
Current theories suggest that stars undergo changes on timescales of millions or billions of years, and that their end i ...
Loading Comments...