Epigenetic alterations in blood mirror age-associated DNA methylation and gene expression changes in human liver

Research output: Contribution to journalArticle

Abstract

Aim: To study the impact of aging on DNA methylation and mRNA expression in human liver. Experimental procedures: We analysed genome-wide DNA methylation and gene expression in human liver samples using Illumina 450K and HumanHT12 expression BeadChip arrays. Results: DNA methylation analysis of ∼455,000 CpG sites in human liver revealed that age was significantly associated with altered DNA methylation of 20,396 CpG sites. Comparison of liver methylation data with published methylation data in other tissues showed that vast majority of the age-associated significant CpG sites overlapped between liver and blood, whereas a smaller overlap was found between liver and pancreatic islets or adipose tissue, respectively. We identified 151 genes whose liver expression also correlated with age. Conclusions: We identified age-associated DNA methylation and expression changes in human liver that are partly reflected by epigenetic alterations in blood.

Details

Authors
Organisations
External organisations
  • University of Eastern Finland
  • Kuopio University Hospital
Research areas and keywords

Subject classification (UKÄ) – MANDATORY

  • Medical Genetics

Keywords

  • aging, blood, diabetes, DNA methylation, ELOVL2, epigenetics, FHL2, gene expression, KLF14, liver
Original languageEnglish
Pages (from-to)105-122
Number of pages18
JournalEpigenomics
Volume9
Issue number2
Publication statusPublished - 2017 Feb 1
Publication categoryResearch
Peer-reviewedYes