Prenatal iron deficiency has lasting effects on developing brains

Prenatal iron deficiency can have lasting impacts on a developing brain, according to researchers. During early pregnancy, cells are already setting the stage for brain formation, and iron plays a crucial role in organizing and shaping these cells. Epidemiological studies indicate that mothers with low iron levels during the first trimester face a higher risk of giving birth to children with cognitive impairments, such as autism, ADHD, and learning disabilities.

Margot Mayer-Proschel, a professor of biomedical genetics and neuroscience at the University of Rochester School of Medicine & Dentistry, led a study published in The Journal of Nutrition. The research team utilized a mouse model to investigate how prenatal iron deficiency leads to long-term functional changes in offspring's brains.

The mice were fed either iron-sufficient or iron-deficient diets before conception and continued those diets throughout pregnancy. Upon birth, all mice were given iron-sufficient diets to assess whether cellular changes could be reversed.

The study revealed that while iron levels normalized in the blood following supplementation, the brain continued to experience impairment, with some regions remaining deficient while others accumulated iron above normal levels. These tissue-specific changes in the brain extended beyond iron deficiency, affecting other essential minerals such as calcium, magnesium, manganese, copper, and zinc, which support development and function.

The mineral imbalances were more profound in the brain compared to the blood, suggesting that blood analyses may not fully capture the long-term brain changes in offspring.

These mineral imbalances were linked to lasting changes in brain networks associated with genes involved in development and communication between neurons. Specifically, myelin formation, which insulates nerve fibers and enables efficient signal transmission, was affected. When myelin is damaged or underdeveloped, neuronal communication can be disrupted.

The researchers also identified changes in the expression levels of genes linked to neurodevelopment and autism spectrum disorder, which varied across different brain regions. In the cortex, hippocampus, and thalamus, gene expression was reduced, while the posterior cortex exhibited increased activity. The superior colliculus, a brain region responsible for processing sensory information and directing attention, showed the most extensive gene expression changes and emerged as a critical area of vulnerability.