Elite Journal of Medical Sciences. Volume 2 issue 8(2024), Pp. 24-36 https://epjournals.com/journals/EJMS Citation: Obeagu EI, Obeagu GU. Hypoxia and Pregnancy: The Role of Genetics and Epigenetics. Elite Journal of Medical Sciences, 2024; 2(8):24-36 1 Hypoxia and Pregnancy: The Role of Genetics and Epigenetics *Emmanuel Ifeanyi Obeagu 1 and Getrude Uzoma Obeagu 2 1 Department of Medical Laboratory Science, Kampala International University, Uganda. 2 School of Nursing Science, Kampala International University, Uganda. *Corresponding authour: Emmanuel Ifeanyi Obeagu, Department of Medical Laboratory Science, Kampala International University, Uganda, emmanuelobeagu@yahoo.com, ORCID: 0000-0002- 4538-0161 Abstract Hypoxia during pregnancy presents significant challenges to maternal and fetal health, often resulting in adverse outcomes such as intrauterine growth restriction (IUGR), preterm birth, and long-term health complications for the offspring. This review explores the critical roles of genetics and epigenetics in mediating the effects of hypoxia on placental function and fetal development. Genetic variations can influence individual responses to hypoxic conditions, impacting pathways involved in oxygen sensing, inflammation, and angiogenesis. Additionally, epigenetic modifications, including DNA methylation and histone modifications, can alter gene expression in response to maternal hypoxia, affecting placental adaptation and function. The interplay between genetic predispositions and epigenetic changes in response to hypoxia has significant implications for pregnancy outcomes. Variations in genes related to the hypoxic response can modulate placental function, while epigenetic alterations can induce lasting changes in gene expression patterns that may affect fetal health both immediately and transgenerationally. Keywords: hypoxia, pregnancy, genetics, epigenetics, placental function Introduction Hypoxia, a condition characterized by inadequate oxygen supply, poses significant risks during pregnancy, impacting both maternal health and fetal development. The placenta, serving as the vital interface between mother and fetus, plays a crucial role in facilitating the exchange of nutrients and oxygen. When maternal hypoxia occurs, it can compromise placental function, leading to a range of adverse pregnancy outcomes, including intrauterine growth restriction (IUGR), preterm birth, and developmental delays. 1-2 Genetic and epigenetic factors are pivotal in determining how individuals respond to hypoxic conditions during pregnancy. Genetics refers to inherited traits that dictate biological responses, while epigenetics encompasses heritable changes in gene expression that do not involve alterations to the DNA sequence itself. These two fields of study intersect significantly, as genetic predispositions can influence epigenetic modifications, which in turn can affect how the body reacts to environmental stressors like hypoxia. Investigating the roles of both genetics and epigenetics in the context of hypoxia during pregnancy provides critical insights into the underlying mechanisms affecting placental health and fetal development. 3- 5 Research has identified specific genetic variations that may predispose individuals to hypoxia- related complications during pregnancy. For example, polymorphisms in genes involved in the hypoxic response, such as hypoxia-inducible factors (HIFs) and vascular endothelial growth factors (VEGFs), can modulate the efficiency of placental adaptation to low oxygen levels. These genetic variations may influence how well the placenta can respond to hypoxic stress, with