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DOHaD; Early-life programming; Fetal origins; Epigenetics; Non-communicable diseases; Prenatal nutrition; Developmental plasticity; Maternal health; Life-course epidemiology

Introduction

The Developmental Origins of Health and Disease (DOHaD) paradigm has revolutionized our understanding of how early-life factors shape long-term health trajectories. Originally conceptualized by Dr. David Barker in the late 20th century as the “fetal origins hypothesis,” DOHaD emphasizes the profound influence of prenatal and early postnatal environments on the risk of developing chronic diseases later in life [1]. With increasing global attention toward the prevention of non-communicable diseases (NCDs), DOHaD presents a critical window of opportunity to reduce disease burden through interventions during the earliest phases of life. The hypothesis is rooted in the concept of developmental plasticity, where the fetus and infant adapt physiologically and metabolically in response to environmental cues [2]. While these adaptations may enhance short-term survival, they can become maladaptive when postnatal conditions diverge significantly from prenatal signals. For instance, a fetus exposed to intrauterine growth restriction (IUGR) due to maternal undernutrition may prioritize energy storage, predisposing the individual to obesity and type 2 diabetes in later life when exposed to a nutrient-rich postnatal environment [3]. Over the past few decades, the increasing global burden of non-communicable diseases (NCDs) has prompted a deeper investigation into their origins. Traditionally attributed to lifestyle choices and adult exposures, there is now overwhelming scientific consensus that many chronic conditions originate much earlier during critical windows of development in utero and early childhood [4]. This conceptual evolution has given rise to the Developmental Origins of Health and Disease (DOHaD) hypothesis, which underscores the profound and lasting influence of early-life environmental exposures on an individual’s risk of disease throughout their lifespan.

The DOHaD framework emerged from epidemiological observations by Professor David Barker in the 1980s, who noted a strong correlation between low birth weight and the increased incidence of coronary heart disease in adulthood [5]. Since then, the field has expanded significantly, encompassing a wide array of prenatal and perinatal exposures ranging from maternal nutrition and infections to psychosocial stress, environmental pollutants, and endocrine-disrupting chemicals. These factors can lead to fetal programming, a process wherein developmental cues in early life permanently alter the structure and function of organs and physiological systems. At the core of DOHaD lies the concept of epigenetics, referring to heritable changes in gene expression without alterations to the underlying DNA sequence [6]. Epigenetic modifications such as DNA methylation and histone modification are increasingly recognized as key mechanisms through which early environmental exposures imprint lifelong health outcomes. Additionally, the quality of placental function, intrauterine growth patterns, maternal metabolic status, and early postnatal influences like breastfeeding and microbiome development contribute to this complex interplay [7]. Understanding DOHaD is essential for designing effective public health strategies. Preventive measures must prioritize preconception care, maternal health, nutritional interventions, and socioeconomic improvements, particularly in vulnerable populations. Moreover, the implications of DOHaD extend to health equity, as disparities in early-life environments often translate into disparities in adult health outcomes [8].

Biological mechanisms behind DOHaD

Epigenetic mechanisms, such as DNA methylation, histone modification, and non-coding RNAs, mediate the expression of genes in response to environmental stimuli without altering the genetic code itself. These changes can influence organ development, metabolic pathways, and immune function. Studies have shown that maternal stress, malnutrition, or exposure to endocrine disruptors can lead to persistent epigenetic alterations in the offspring, affecting disease susceptibility. The intrauterine hormonal environment regulated by maternal cortisol, insulin, leptin, and other metabolic hormones can shape the developing endocrine system. For example, excess maternal glucocorticoids are linked with altered hypothalamic-pituitary-adrenal (HPA) axis function in offspring, increasing the risk of anxiety, depression, and metabolic syndrome. Maternal obesity and excessive gestational weight gain have been linked to increased risks of childhood obesity, insulin resistance, and metabolic disorders in offspring, forming a transgenerational cycle of metabolic disease.

Adverse childhood experiences (ACEs), maternal mental health disorders, and poor attachment have been shown to increase risks for depression, anxiety, and behavioral disorders. Neuroimaging studies reveal structural brain changes in children exposed to chronic early-life stress.

Encouraging reproductive-aged women and men to maintain healthy lifestyles, manage chronic diseases, and achieve optimal nutrition. Maternal and infant nutrition: Promoting balanced diets, iron and folic acid supplementation, and exclusive breastfeeding for at least six months. Stress reduction and mental health: Providing psychosocial support to reduce maternal stress, anxiety, and depression. Monitoring growth trajectories: Surveillance of fetal and early childhood growth patterns to identify and manage at-risk individuals. Health education: Raising awareness about the importance of the first 1,000 days from conception to two years of age.

Conclusion

The DOHaD framework offers a unifying theory linking early-life exposures with lifelong health, highlighting the necessity of proactive and preventive healthcare strategies that begin even before birth. The scientific evidence supporting DOHaD is robust, and its implications for healthcare systems, public policy, and clinical practice are profound. By shifting our focus to the earliest stages of human development, we have a unique opportunity to reshape the future of global health reducing the burden of chronic diseases, improving quality of life, and fostering healthier generations to come.