Comprehensive analysis of epigenetic clocks reveals associations between disproportionate biological ageing and hippocampal volume

Geroscience. 2022 Jun;44(3):1807-1823. doi: 10.1007/s11357-022-00558-8. Epub 2022 Apr 21.

Abstract

The concept of age acceleration, the difference between biological age and chronological age, is of growing interest, particularly with respect to age-related disorders, such as Alzheimer's Disease (AD). Whilst studies have reported associations with AD risk and related phenotypes, there remains a lack of consensus on these associations. Here we aimed to comprehensively investigate the relationship between five recognised measures of age acceleration, based on DNA methylation patterns (DNAm age), and cross-sectional and longitudinal cognition and AD-related neuroimaging phenotypes (volumetric MRI and Amyloid-β PET) in the Australian Imaging, Biomarkers and Lifestyle (AIBL) and the Alzheimer's Disease Neuroimaging Initiative (ADNI). Significant associations were observed between age acceleration using the Hannum epigenetic clock and cross-sectional hippocampal volume in AIBL and replicated in ADNI. In AIBL, several other findings were observed cross-sectionally, including a significant association between hippocampal volume and the Hannum and Phenoage epigenetic clocks. Further, significant associations were also observed between hippocampal volume and the Zhang and Phenoage epigenetic clocks within Amyloid-β positive individuals. However, these were not validated within the ADNI cohort. No associations between age acceleration and other Alzheimer's disease-related phenotypes, including measures of cognition or brain Amyloid-β burden, were observed, and there was no association with longitudinal change in any phenotype. This study presents a link between age acceleration, as determined using DNA methylation, and hippocampal volume that was statistically significant across two highly characterised cohorts. The results presented in this study contribute to a growing literature that supports the role of epigenetic modifications in ageing and AD-related phenotypes.

Keywords: Ageing; Alzheimer’s disease; Cognition; DNA methylation; Epigenetics; Hippocampal volume.

MeSH terms

  • Aging / genetics
  • Alzheimer Disease* / diagnostic imaging
  • Alzheimer Disease* / genetics
  • Amyloid beta-Peptides
  • Australia
  • Cross-Sectional Studies
  • Epigenesis, Genetic
  • Hippocampus / diagnostic imaging
  • Humans

Substances

  • Amyloid beta-Peptides