Summary
This study presents a longitudinal catalogue of genetic influences on DNA methylation across five critical life stages from birth through middle age, using blood samples from children and their mothers. The authors demonstrate that genetic effects on methylation are highly stable across the lifespan, with developmental changes driven primarily by increases in environmental and stochastic variation rather than genetic shifts. The findings suggest that DNA methylation contains a significant heritable component with potential causal roles in complex diseases, underpinned by highly polygenic trans-acting effects.
Regional applicability
This study was conducted in the United Kingdom using the Avon Longitudinal Study of Parents and Children (ALSPAC), a well-established British birth cohort. The findings are directly applicable to UK public health research and provide a valuable resource for investigating epigenetic pathways to disease in UK populations, though the generalisability to non-European ancestry groups remains unclear.
Key measures
Methylation quantitative trait loci (mQTL); cis-acting and trans-acting genetic variation; heritability of DNA methylation across five life stages; contribution of mQTL to complex trait variation
Outcomes reported
The study catalogued genetic influences on DNA methylation (mQTL) at five life stages in human blood: birth, childhood, adolescence, and maternal pregnancy and middle age. It quantified the stability of genetic effects on methylation across the lifespan and estimated the contribution of methylation to variation in complex traits.
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