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Sci Rep. 2015 Nov 27;5:17328. doi: 10.1038/srep17328.

Genome-wide DNA methylation map of human neutrophils reveals widespread inter-individual epigenetic variation.

Author information

1
Department of Pathology, Dunedin School of Medicine, University of Otago, 270 Great King Street, Dunedin 9054, New Zealand.
2
Gravida: National Centre for Growth and Development, 2-6 Park Ave, Grafton, Auckland 1142, New Zealand.
3
Department of Biochemistry, University of Otago, 710 Cumberland Street, Dunedin 9054, New Zealand.
4
Laboratory for Evolution and Development, Department of Biochemistry, University of Otago, 710 Cumberland Street, Dunedin 9054, New Zealand.
5
Department of Mathematics and Statistics, University of Otago, P.O. Box 56, Dunedin, 9054, New Zealand.

Abstract

The extent of variation in DNA methylation patterns in healthy individuals is not yet well documented. Identification of inter-individual epigenetic variation is important for understanding phenotypic variation and disease susceptibility. Using neutrophils from a cohort of healthy individuals, we generated base-resolution DNA methylation maps to document inter-individual epigenetic variation. We identified 12851 autosomal inter-individual variably methylated fragments (iVMFs). Gene promoters were the least variable, whereas gene body and upstream regions showed higher variation in DNA methylation. The iVMFs were relatively enriched in repetitive elements compared to non-iVMFs, and were associated with genome regulation and chromatin function elements. Further, variably methylated genes were disproportionately associated with regulation of transcription, responsive function and signal transduction pathways. Transcriptome analysis indicates that iVMF methylation at differentially expressed exons has a positive correlation and local effect on the inclusion of that exon in the mRNA transcript.

PMID:
26612583
PMCID:
PMC4661471
DOI:
10.1038/srep17328
[Indexed for MEDLINE]
Free PMC Article

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