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Geroscience
2024 Feb 01;461:945-960. doi: 10.1007/s11357-023-00840-3.
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DNA methylation clocks for clawed frogs reveal evolutionary conservation of epigenetic aging.
Zoller JA
,
Parasyraki E
,
Lu AT
,
Haghani A
,
Niehrs C
,
Horvath S
.
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To address how conserved DNA methylation-based epigenetic aging is in diverse branches of the tree of life, we generated DNA methylation data from African clawed frogs (Xenopus laevis) and Western clawed frogs (Xenopus tropicalis) and built multiple epigenetic clocks. Dual species clocks were developed that apply to both humans and frogs (human-clawed frog clocks), supporting that epigenetic aging processes are evolutionary conserved outside mammals. Highly conserved positively age-related CpGs are located in neural-developmental genes such as uncx, tfap2d as well as nr4a2 implicated in age-associated disease. We conclude that signatures of epigenetic aging are evolutionary conserved between frogs and mammals and that the associated genes relate to neural processes, altogether opening opportunities to employ Xenopus as a model organism to study aging.
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