Age-related epigenome-wide DNA methylation and hydroxymethylation in longitudinal mouse blood
| Autor: | Dana C. Dolinoy, Maureen A. Sartor, Raymond G. Cavalcante, Joseph Kochmanski, Elizabeth H. Marchlewicz |
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| Rok vydání: | 2018 |
| Předmět: |
Epigenomics
Male 0301 basic medicine Aging Cancer Research Biology Epigenesis Genetic Mice 03 medical and health sciences Animals Epigenetics Molecular Biology Gene Genetics Genome Epigenome DNA Methylation 030104 developmental biology NFIC Gene Expression Regulation CpG site Reduced representation bisulfite sequencing DNA methylation Chromosomal region 5-Methylcytosine Female Research Paper |
| Zdroj: | Epigenetics. 13:779-792 |
| ISSN: | 1559-2308 1559-2294 |
| DOI: | 10.1080/15592294.2018.1507198 |
| Popis: | DNA methylation at cytosine-phosphate-guanine (CpG) dinucleotides changes as a function of age in humans and animal models, a process that may contribute to chronic disease development. Recent studies have investigated the role of an oxidized form of DNA methylation – 5-hydroxymethylcytosine (5hmC) – in the epigenome, but its contribution to age-related DNA methylation remains unclear. We tested the hypothesis that 5hmC changes with age, but in a direction opposite to 5-methylcytosine (5mC), potentially playing a distinct role in aging. To characterize epigenetic aging, genome-wide 5mC and 5hmC were measured in longitudinal blood samples (2, 4, and 10 months of age) from isogenic mice using two sequencing methods – enhanced reduced representation bisulfite sequencing and hydroxymethylated DNA immunoprecipitation sequencing. Examining the epigenome by age, we identified 28,196 unique differentially methylated CpGs (DMCs) and 8,613 differentially hydroxymethylated regions (DHMRs). Mouse blood showed a general pattern of epigenome-wide hypermethylation and hypo-hydroxymethylation with age. Comparing age-related DMCs and DHMRs, 1,854 annotated genes showed both differential 5mC and 5hmC, including one gene – Nfic – at five CpGs in the same 250 bp chromosomal region. At this region, 5mC and 5hmC levels both decreased with age. Reflecting these age-related epigenetic changes, Nfic RNA expression in blood decreased with age, suggesting that age-related regulation of this gene may be driven by 5hmC, not canonical DNA methylation. Combined, our genome-wide results show age-related differential 5mC and 5hmC, as well as some evidence that changes in 5hmC may drive age-related DNA methylation and gene expression. |
| Databáze: | OpenAIRE |
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