by Zaid Elayyan, Texas A&M University
~ Retrieved from https://medicalxpress.com/news/2025-10-prenatal-alcohol-exposure-rewires-brain.html
Fetal Alcohol Spectrum Disorders (FASD), a leading cause of neurodevelopmental disorders, may affect as many as 1 in 20 school-aged children in the United States. Despite its prevalence, the exact brain circuit responsible for FASD’s hallmark symptom—cognitive inflexibility, or the inability to adjust thoughts and behaviors to new environments—has largely remained a mystery.
A new study led by Dr. Jun Wang and co-authored by Dr. Rajesh Miranda, professors at Texas A&M University’s Naresh K. Vashisht College of Medicine, observed that alcohol consumption both during pregnancy and around the time of birth significantly impairs an offspring’s brain development—particularly in regions that govern decision-making—while also increasing the risk of compulsive alcohol use later in life.
“It’s exciting,” Wang said. “We’ve identified a specific brain cell in offspring affected by early alcohol exposure that’s directly linked to problems with flexible thinking and impulse control, and this gives us a clear target for better understanding and eventually developing more effective treatments of FASD.
“Our findings represent a major step forward in FASD research. By uncovering how early alcohol exposure changes brain chemistry, we’re able to move from describing symptoms to transitioning into treating root causes.”
Targeted treatments and a call for awareness
By pinpointing the exact brain circuits affected by prenatal alcohol exposure, the study opens possibilities for targeted therapies aimed at restoring normal cognitive and behavioral flexibility in individuals with FASD.
The findings also reinforce longstanding public health messages about the risks of drinking alcohol during pregnancy or around the time of birth.
“Even limited alcohol consumption during sensitive developmental windows can have profound and lifelong consequences,” Wang said.
Neuron damage in key brain regions
Published in Neuropharmacology, the study explored the impact of early alcohol exposure on a specific type of brain cell known as cholinergic interneurons, or CINs—important regulators of learning, behavioral flexibility and impulse control within the brain’s decision-making hub, the striatum.
“CINs are like the conductors of the brain’s decision-making orchestra,” Wang explained. “They are largely responsible for the decision-making network in the brain.”
Using high-resolution imaging techniques, the team not only discovered a sharp reduction in the number of CINs in prenatal alcohol-exposed offspring, but they also observed a marked decrease in their firing activity and release of acetylcholine, an essential chemical for learning and adaptive behavior.
“Alcohol exposure during pregnancy or around the time of birth disrupts these conductors,” Wang said. “This impairs the brain’s ability to make critical decisions, learn from feedback and adjust to change.”
These disruptions and deficits help explain why individuals with FASD struggle with cognitive flexibility.