What the Mouse Study Found
To explore this possibility, scientists conducted experiments on mice with different gut microbiota profiles. One group carried bacteria associated with a stronger inflammatory response driven by IL-17a, while a control group did not.
When researchers temporarily suppressed IL-17a in newborn mice, both groups displayed typical behavior. However, once the suppression stopped and the mice developed naturally, those in the first group began showing repetitive behaviors commonly associated with autism-like traits in animal models.
To further test the connection, scientists performed a fecal transplant. They transferred gut bacteria from the first group of mice into the second group. After the transfer, the second group also began exhibiting similar autism-like behaviors.
While these findings are limited to animal studies, they provide a foundation for further research into how maternal gut health may influence neurodevelopment.
What This Means for Future Research
Although blocking IL-17a might seem like a potential preventive strategy, researchers caution against directly manipulating the immune system during pregnancy. As Lukens explained, pregnancy requires a delicate immune balance to protect both the mother and the developing fetus.
“Maintenance of embryonic health demands a complex balance of immune regulation,” he noted, emphasizing that altering immune pathways during pregnancy carries risks.
Instead, future research may focus on identifying specific features of the maternal microbiome that correlate with autism risk and exploring safer ways to support healthy gut environments during pregnancy.
Importantly, IL-17a represents only one piece of a much larger and complex puzzle. Scientists stress that autism is influenced by multiple genetic and environmental factors, and much more research is needed before drawing conclusions for humans.