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Cross-Tissue Specificity of Pediatric DNA Methylation Associated with Cumulative Family Adversity

Chan, M. H.-M.; Merrill, S. M.; Fatima, F.; MacIsaac, J. L.; Obradovic, J.; Boyce, W. T.; Kobor, M. S.

2023-10-06 genomics
10.1101/2023.10.04.559423 bioRxiv
Show abstract

BackgroundCumulative family adversity (cumulative FA), characterized by co-occurring stressors in a family context, may be biologically embedded through DNA methylation (DNAm) and contribute to later health outcomes. Materials & MethodsWe compared epigenome-wide DNAm associated with cumulative FA in buccal epithelial cells (BECs; n=218) and peripheral blood mononuclear cells (PBMCs; n=51) from 7-13-year-old children in Canada, accounting for sex, age, predicted cell-type proportion, and genetic ancestry. ResultsHigher levels of cumulative FA were associated with DNAm at seven sites, primarily in stress- and immune-related genes, only in PBMCs. Negative mother-child interaction contributed to this association. ConclusionsThe findings of this study suggested that PBMC DNAm can be used as a marker for biological embedding of cumulative FA.

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