DNA methylation dynamics in aging: how far are we from understanding the mechanisms?. (September 2018)

• Record Type: Journal Article
• Authors: Ciccarone, Fabio; Tagliatesta, Stefano; Caiafa, Paola; Zampieri, Michele
• Is Part Of: Mechanisms of ageing and development. Volume 174(2018)
• Page Start: 3
• Page End: 17
• Publication Date: 2018-09
• Subjects: DNA methylation -- DNA demethylation -- Aging -- Chromatin -- Histones; Aging -- Periodicals; Developmental biology -- Periodicals; Aging -- Periodicals; Developmental Biology -- Periodicals; Vieillissement -- Périodiques; Biologie du développement -- Périodiques; Aging; Developmental biology; Periodicals; 612.67
• DOI: 10.1016/j.mad.2017.12.002
• Languages: English
• ISSNs: 0047-6374

Abstract

Highlights: Aging trajectories can be closely tracked down by changes in the DNA epigenetic modification patterns We summarise current knowledge about DNA methylation/demethylation mechanisms and the dynamic nature of the DNA modifications pattern We describe DNA methylation and hydroxymethylation changes that occur during aging in mammals We discuss possible molecular mechanisms that underpin aging-associated DNA hypermethylation and hypomethylation Abstract: DNA methylation is currently the most promising molecular marker for monitoring aging and predicting life expectancy. However, the mechanisms underlying age-related DNA methylation changes remain mostly undiscovered. Here we discuss the current knowledge of the dynamic nature of DNA epigenome landscape in mammals, and propose putative molecular mechanisms for aging-associated DNA epigenetic changes. Specifically, we describe age-related variations of methylcytosine and its oxidative derivatives in relation to the dynamics of chromatin structure, histone post-translational modifications and their modulators. Finally, we are proposing a conceptual framework that could explain the complex nature of the effects of age on DNA methylation patterns. This combines the accumulation of DNA methylation noise and also all of the predictable, site-specific DNA methylation changes. Gathering information in this area would pave the way for future investigation aimed at establishing a possible causative role of epigenetic mechanisms in aging.