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DNA methylation markers of age(ing) in non‐model animals.
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- Author(s): Tangili, Marianthi (AUTHOR); Slettenhaar, Annabel J. (AUTHOR); Sudyka, Joanna (AUTHOR); Dugdale, Hannah L. (AUTHOR); Pen, Ido (AUTHOR); Palsbøll, Per J. (AUTHOR); Verhulst, Simon (AUTHOR)
- Source:
Molecular Ecology. Sep2023, Vol. 32 Issue 17, p4725-4741. 17p. - Source:
- Additional Information
- Subject Terms:
- Abstract: Inferring the chronological and biological age of individuals is fundamental to population ecology and our understanding of ageing itself, its evolution, and the biological processes that affect or even cause ageing. Epigenetic clocks based on DNA methylation (DNAm) at specific CpG sites show a strong correlation with chronological age in humans, and discrepancies between inferred and actual chronological age predict morbidity and mortality. Recently, a growing number of epigenetic clocks have been developed in non‐model animals and we here review these studies. We also conduct a meta‐analysis to assess the effects of different aspects of experimental protocol on the performance of epigenetic clocks for non‐model animals. Two measures of performance are usually reported, the R2 of the association between the predicted and chronological age, and the mean/median absolute deviation (MAD) of estimated age from chronological age, and we argue that only the MAD reflects accuracy. R2 for epigenetic clocks based on the HorvathMammalMethylChip4 was higher and the MAD scaled to age range lower, compared with other DNAm quantification approaches. Scaled MAD tended to be lower among individuals in captive populations, and decreased with an increasing number of CpG sites. We conclude that epigenetic clocks can predict chronological age with relatively high accuracy, suggesting great potential in ecological epigenetics. We discuss general aspects of epigenetic clocks in the hope of stimulating further DNAm‐based research on ageing, and perhaps more importantly, other key traits. [ABSTRACT FROM AUTHOR]
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