Human Biology Open Access Pre-Prints
Document Type
Article
Anticipated Volume
96
Anticipated Issue
3
Abstract
The in utero environment is now widely recognized as a critical determinant of health across the entire lifespan. The developmental origins of health and disease (DOHaD) framework has established that prenatal exposures, including maternal stress, infection, nutrition, and environmental toxins, can impact fetal development in profound ways associated with disease risk from infancy to old age. Yet a fundamental aspect of pregnancy, the bidirectional exchange of maternal and fetal cells, DNA, and other biological material, a phenomenon known as microchimerism, has received little attention in this context. Maternal cells and genomic material transfer to the developing fetus early in utero and can persist well into adulthood, detected across diverse tissues including blood, lymph nodes, bone marrow, heart, liver, and pancreas. Accumulating evidence suggests these maternal microchimeric cells contribute to offspring health beyond pregnancy, including immune programming, reduced susceptibility to childhood infections, and tolerance induction. However, maternal microchimerism is also associated with adverse outcomes including autoimmune disease, allergies, and diabetes, suggesting that its effects are context-dependent. Critically, maternal cells are distinct from other DOHaD mechanisms in that the transferred material is not a signal. These are living cells capable of persisting, differentiating, and responding dynamically to the host environment for decades. During the reproductive years, pregnancy introduces a new layer of cellular exchange, with evidence of competitive interactions between newly acquired fetal microchimeric cells and previously established maternal microchimeric cells, demonstrating multigenerational impacts of microchimerism biology. This perspective argues that maternal microchimerism should be recognized alongside epigenetics, hormonal signaling, and nutritional transfer as a core mechanism through which the early environment shapes offspring biology across the life course.
Recommended Citation
Boddy, Amy M. and Chua, Kristine J., "Maternal Microchimerism As a Mechanism of Developmental Origins of Health and Disease" (2026). Human Biology Open Access Pre-Prints. 242.
https://digitalcommons.wayne.edu/humbiol_preprints/242