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Mystery of why big dogs age faster than small ones finally solved
The Independent • • science
Key Points:
- New research identifies the "jumping" gene LINE1 and its reduced DNA methylation as key factors explaining why larger dogs age faster than smaller dogs, with larger dogs losing 35% more LINE1 gene methylation.
- LINE1 genes can replicate and insert themselves throughout canine DNA, and loss of methylation control leads to increased LINE1 activity, DNA damage, and accelerated aging.
- The study also found unexpected sex differences in large dogs, with females showing more LINE1 gene-jumping, challenging previous assumptions about X chromosome regulation in aging.
- These findings highlight a molecular basis for the size-lifespan tradeoff in dogs and suggest that transposable elements like LINE1 may play a fundamental role in aging across mammals.
- Researchers hope this insight will pave the way for therapies aimed at extending the lifespan and health span of large dogs and potentially humans by targeting these genetic elements or their regulatory mechanisms.
