Exercise restores muscle repair through one overactive gene
Muscles weaken with age. But the underlying reason has been elusive. Researchers have now identified a gene called DEAF1 that becomes overactive in aging muscle and interferes with the cell’s ability to clear damaged proteins and repair itself. Exercise may partially reverse this.
Muscle cells are constantly maintaining themselves. They break down damaged proteins and replace them with new ones. This protein clearance system, known as proteostasis, is essential for strong, well-functioning muscle. In aging, this system becomes dysregulated, contributing to muscle loss and reduced strength.
DEAF1: a gene that turns up too loud
Scientists discovered that the gene DEAF1 becomes overactive in muscle tissue with age. Normally expressed at lower levels, its activity increases in older muscle. This disrupts the ability of muscle cells to clear damaged proteins and carry out effective self-repair.
The research shows that physical exercise can partially suppress DEAF1 activity. This gives the protein clearance system more room to operate, allowing muscle cells to rebuild and regain strength. Older muscles can still respond to the stimulus of exercise, at least when the dysregulation has not progressed too far.
The researchers emphasize that benefits appear to diminish once the system is too disrupted. There seems to be a threshold: beyond a certain level of DEAF1 overactivity, exercise may no longer be sufficient to restore balance on its own.
A molecular target in age-related muscle loss
Age-related muscle loss (sarcopenia) is one of the leading causes of loss of independence in older adults. Until now, the specific molecular mechanisms behind impaired muscle repair in aging have remained unclear. This gene provides a concrete entry point for further research.
Whether DEAF1 operates identically in humans has not yet been established. Results are preliminary and require further confirmation. Still, the finding suggests a potential therapeutic target: if DEAF1 activity could be selectively reduced, it might enhance the effectiveness of exercise interventions in older people.
For now, the study adds to the evidence that exercise has measurable effects on the biology of aging in muscle, right down to the molecular level.
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