Age-associated changes in DNA methylation across multiple tissues in an inbred mouse model

Area of Science:

• Epigenetics
• Genomics
• Aging Research

Background:

• Epigenetic alterations, particularly DNA methylation changes, are linked to aging and age-related diseases.
• Human studies show strong correlations between DNA methylation at specific sites and chronological age.

Purpose of the Study:

• To investigate the tissue specificity of human age-associated differentially methylated positions (aDMPs).
• To quantify DNA methylation in homologous murine genomic regions across multiple tissues.
• To assess the conservation of age-associated DNA methylation patterns between humans and mice.

Main Methods:

• Selected four high-confidence human aDMPs near ELOVL2, GLRA1, MYOD1, and PDE4C genes.
• Quantified DNA methylation in blood, lung, cerebellum, and hippocampus of C57BL/6J mice.
• Analyzed methylation across a wide age range, from embryonic day 17 to 630 days.

Main Results:

• Observed tissue-specific age-associated DNA methylation changes in mice.
• These changes were directionally consistent with human age-associated methylation patterns.
• DNA methylation patterns showed conservation across tissues and between species.

Conclusions:

• Age-associated DNA methylation changes are conserved across tissues and mammalian species.
• Model systems like mice are valuable for studying conserved epigenetic aging phenomena under controlled conditions.
• These findings reinforce the link between DNA methylation and the aging process.