Integrated analysis of environmental and genetic influences on cord blood DNA methylation in new-borns

Epigenetic processes, including DNA methylation (DNAm), are among the mechanisms allowing integration of genetic and environmental factors to shape cellular function. While many studies have investigated either environmental or genetic contributions to DNAm, few have assessed their integrated effects. Here we examine the relative contributions of prenatal environmental factors and genotype on DNA methylation in neonatal blood at variably methylated regions (VMRs) in 4 independent cohorts (overall n = 2365). We use Akaike’s information criterion to test which factors best explain variability of methylation in the cohort-specific VMRs: several prenatal environmental factors (E), genotypes in cis (G), or their additive (G + E) or interaction (GxE) effects. Genetic and environmental factors in combination best explain DNAm at the majority of VMRs. The CpGs best explained by either G, G + E or GxE are functionally distinct. The enrichment of genetic variants from GxE models in GWAS for complex disorders supports their importance for disease risk

Integrated analysis of environmental and genetic influences on cord blood DNA methylation in new-borns

Epigenetic processes, including DNA methylation (DNAm), are among the mechanisms allowing integration of genetic and environmental factors to shape cellular function. While many studies have investigated either environmental or genetic contributions to DNAm, few have assessed their integrated effects. Here we examine the relative contributions of prenatal environmental factors and genotype on DNA methylation in neonatal blood at variably methylated regions (VMRs) in 4 independent cohorts (overall n = 2365). We use Akaike's information criterion to test which factors best explain variability of methylation in the cohort-specific VMRs: several prenatal environmental factors (E), genotypes in cis (G), or their additive (G + E) or interaction (GxE) effects. Genetic and environmental factors in combination best explain DNAm at the majority of VMRs. The CpGs best explained by either G, G + E or GxE are functionally distinct. The enrichment of genetic variants from GxE models in GWAS for complex disorders supports their importance for disease risk.Peer reviewe

Understanding the mental health impacts of COVID-19 through a trauma lens

This special issue of the European Journal of Psychotraumatology (EJPT) presents the first studies published by EJPT on COVID-19. We present 26 qualitative and quantitative studies assessing the prevalence of trauma-related symptoms and psychopathology within specific vulnerable populations such as health-care workers, students, children, and managers, or more broadly at a country level with a diverse set of outcomes including post-traumatic stress, moral injury, grief and post-traumatic growth. Intervention studies focus on whether telehealth delivery of mental health therapy in the pandemic environment was useful and effective. It is clear that the pandemic has brought with it a rise in trauma exposure and consequently impacted on trauma-related mental health. While for many individuals, COVID-19-related events met criteria for a DSM-5 Criterion A event, challenges remain in disentangling trauma exposure from stress, anxiety, and other phenomena. It is important to determine the contexts in which a trauma lens makes a useful contribution to understanding the mental health impacts of COVID-19 and the ways in which this may facilitate recovery. The papers included in this Special Issue provide an important and much-needed evidence-based foundation for developing trauma-informed understanding and responses to the pandemic