Longitudinal epigenetic drift in mice perinatally exposed to lead

Christopher Faulk, Kevin Liu, Amanda Barks, Jaclyn M. Goodrich, Dana C. Dolinoy

Research output: Contribution to journalArticlepeer-review

26 Scopus citations

Abstract

An understanding of the natural change in DNA methylation over time, defined as "epigenetic drift," will inform the study of environmental effects on the epigenome. this study investigates epigenetic drift in isogenic mice exposed perinatally to lead (Pb) acetate at four concentrations, 0 ppm (control), 2.1 ppm (low), 16 ppm (medium), and 32 ppm (high) prior to conception through weaning, then followed until 10 months of age. Absolute values of DNA methylation in a transposon-associated metastable locus, Cdk5-activator binding protein (CabpIAP), and three imprinted loci (Igf2, Igf2r, and H19) were obtained from tail tissue in paired samples. DNA methylation levels in the controls increased over time at the imprinted Igf2 and Igf2r loci (both P = 0.0001), but not at the imprinted H19 locus or the CabpIAP metastable epiallele. Pb exposure was associated with accelerated DNA hypermethylation in CabpIAP (P = 0.0209) and moderated hypermethylation in Igf2r (P = 0.0447), and with marginally accelerated hypermethylation at H19 (P = 0.0847). in summary, the presence and magnitude of epigenetic drift was locus-dependent, and enhancement of drift was mediated by perinatal Pb exposure, in some, but not all, loci.

Original languageEnglish (US)
Pages (from-to)934-941
Number of pages8
JournalEpigenetics
Volume9
Issue number7
DOIs
StatePublished - Jan 5 2014

Keywords

  • DNA methylation
  • Development
  • Drift
  • Environment
  • Environmental epigenomics
  • Epigenetics
  • Plasticity

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