Israeli Professor Studies Gut Microbiome's Impact on Fetal Development

Professor Omri Koren of Bar-Ilan University's Azrieli Faculty of Medicine in the Galilee is researching the critical "first thousand days" of life, from conception to age two, a period he describes as crucial for physical and neurological development. His lab investigates how the maternal microbiome influences fetal health, building on his earlier work on marine microbiomes and coral reefs.

Koren's research shifted from marine biology to human health after the birth of his first child. During his postdoctoral studies at Cornell University, he began examining the dramatic changes in a mother's gut bacteria during pregnancy and their potential impact on the developing fetus. He posits that humans, like corals, are "holobionts," complex ecosystems dependent on the microorganisms living within and on them.

The gut microbiome plays a vital role in training the immune system, protecting against pathogens, and producing essential vitamins. Furthermore, gut bacteria generate thousands of metabolites, small molecules that enter the bloodstream and influence various bodily functions, including neural communication, metabolism, and mood.

Koren's lab is specifically investigating gestational diabetes, a condition where maternal gut microbiome composition changes as early as the first trimester, preceding clinical diagnosis. Experiments involving transferring gut bacteria from mothers with gestational diabetes to mice showed that these bacteria could induce metabolic changes in the mice and their offspring, suggesting the microbiome actively contributes to the disease process.

Researchers hypothesize that metabolites produced by the maternal microbiome can cross the placenta and signal to the fetus. Identifying these specific metabolites could lead to future interventions, such as nutritional supplements, to balance the fetal environment and mitigate the effects of gestational diabetes. The ultimate goal is to understand and potentially influence the chemical communication between the maternal microbiome and the fetus during this formative period.