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2017 ; 18
(1
): 58
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Diverse interventions that extend mouse lifespan suppress shared age-associated
epigenetic changes at critical gene regulatory regions
#MMPMID28351383
Cole JJ
; Robertson NA
; Rather MI
; Thomson JP
; McBryan T
; Sproul D
; Wang T
; Brock C
; Clark W
; Ideker T
; Meehan RR
; Miller RA
; Brown-Borg HM
; Adams PD
Genome Biol
2017[Mar]; 18
(1
): 58
PMID28351383
show ga
BACKGROUND: Age-associated epigenetic changes are implicated in aging. Notably,
age-associated DNA methylation changes comprise a so-called aging "clock", a
robust biomarker of aging. However, while genetic, dietary and drug interventions
can extend lifespan, their impact on the epigenome is uncharacterised. To fill
this knowledge gap, we defined age-associated DNA methylation changes at the
whole-genome, single-nucleotide level in mouse liver and tested the impact of
longevity-promoting interventions, specifically the Ames dwarf Prop1 (df/df)
mutation, calorie restriction and rapamycin. RESULTS: In wild-type mice fed an
unsupplemented ad libitum diet, age-associated hypomethylation was enriched at
super-enhancers in highly expressed genes critical for liver function. Genes
harbouring hypomethylated enhancers were enriched for genes that change
expression with age. Hypermethylation was enriched at CpG islands marked with
bivalent activating and repressing histone modifications and resembled
hypermethylation in liver cancer. Age-associated methylation changes are
suppressed in Ames dwarf and calorie restricted mice and more selectively and
less specifically in rapamycin treated mice. CONCLUSIONS: Age-associated hypo-
and hypermethylation events occur at distinct regulatory features of the genome.
Distinct longevity-promoting interventions, specifically genetic, dietary and
drug interventions, suppress some age-associated methylation changes, consistent
with the idea that these interventions exert their beneficial effects, in part,
by modulation of the epigenome. This study is a foundation to understand the
epigenetic contribution to healthy aging and longevity and the molecular basis of
the DNA methylation clock.