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A study led by Duke-NUS Medical School identified a pathway linking the gene DEAF1, the mTORC1 signaling system and age-related changes in muscle repair. In fruit flies and mice, exercise lowered DEAF1 levels and helped rebalance the pathway; whether the mechanism works the same way in people remains unconfirmed.
Researchers led by Duke-NUS Medical School have identified a biological pathway through which exercise may help aging muscles maintain and repair themselves. In experiments in fruit flies and mice, physical activity reduced levels of the gene DEAF1 and helped rebalance mTORC1, a system involved in protein production; the findings do not yet establish that the mechanism works the same way in humans.
The research, conducted with Singapore General Hospital and Cardiff University, was published in the journal Proceedings of the National Academy of Sciences. The team examined how aging affects the balance between making proteins and clearing damaged ones in muscle cells. Maintaining that balance is part of keeping muscle tissue functional.
The researchers report that DEAF1 levels can rise with age, driving excessive activity in mTORC1. When the pathway is overactive, cells may continue producing proteins while becoming less effective at removing damaged ones. The study links this buildup to declining muscle maintenance. FOXO proteins normally help regulate DEAF1, but the researchers say FOXO activity tends to decline with age, weakening that control.
In the experiments, exercise activated regulatory proteins that lowered DEAF1 and brought mTORC1 activity closer to a healthier balance. The researchers say this supported the removal of damaged proteins while allowing cells to continue producing proteins they need. The work describes a mechanism observed in animal models, not evidence that exercise reverses muscle aging in people or restores muscle function in every older adult.
How the Pathway Could Shape Muscle Health
Age-related muscle decline can affect strength, mobility and independence, and may make recovery from illness or injury harder. By identifying a pathway that links exercise with muscle-cell maintenance, the study offers a possible explanation for some of the biological effects of physical activity as muscles age.
The results may also help researchers investigate why older people respond differently to exercise. The team found that when DEAF1 is extremely elevated or FOXO activity is very low, exercise may not fully restore normal repair in the animal models. That suggests the condition of the underlying cellular system could matter, but it does not establish a way to predict individual responses in humans.
The findings could inform future research into treatments for age-related muscle loss, but they do not present a treatment ready for clinical use. Exercise remains the intervention tested in the study; the possible medical applications are a research direction, not a demonstrated benefit for patients.
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The Protein Balance Behind Muscle Aging
Muscle cells rely on both protein production and protein clearance to maintain their structure and function. mTORC1 helps regulate growth and protein production. The study focuses on what can happen when this signaling system becomes too active relative to the cell’s ability to remove damaged material.
Scientists have previously recognized that disrupted protein maintenance contributes to muscle deterioration, according to the report. The new work identifies DEAF1 and declining FOXO regulation as part of a chain that may help explain how the imbalance develops, and why exercise can affect it in the animal models. The broader relevance to humans remains to be tested.
“Exercise can reverse this process, correcting the imbalance.”
— Assistant Professor Tang Hong-Wen, the study’s lead author at Duke-NUS Medical School
Human Effects Still Need Testing
The study’s experiments were conducted in fruit flies and mice. The available findings do not show whether exercise changes DEAF1 and mTORC1 in the same way in human muscle, or whether that change improves strength, mobility or recovery in older people. The researchers say the mechanism may eventually guide new approaches, but no human treatment or clinical outcome is established here.
It is also unclear how often DEAF1 becomes too elevated, how low FOXO activity must fall before exercise has limited effects, or how those measures relate to a person’s age, health or exercise history. The report does not provide a routine or dose of exercise that can be prescribed from these results. The finding that exercise may not fully restore repair in some animal-model conditions should not be read as showing that physical activity has no value for older adults.
Testing the Mechanism in People
The next step is to determine whether the DEAF1–FOXO–mTORC1 pathway has a comparable role in human muscle and responds to exercise in a clinically meaningful way. Further research would also need to clarify which people might have a weaker response and whether any intervention aimed at the pathway is safe and effective.
Until human studies establish those points, the findings are best understood as an explanation emerging from animal research, not a change to exercise guidance or an available therapy. The report does not specify a timetable for clinical studies or announce a planned human trial.
Key Questions
What did the researchers discover?
They linked age-related rises in DEAF1 to excessive mTORC1 activity and disrupted protein maintenance in muscle. In fruit flies and mice, exercise lowered DEAF1 and helped rebalance the pathway.
Does this prove exercise reverses muscle aging in humans?
No. The experiments were performed in fruit flies and mice. The study does not confirm that the same mechanism occurs in people or that exercise reverses human muscle aging.
Why might exercise help muscle cells?
The researchers report that exercise activated regulatory proteins that reduced DEAF1, helping balance mTORC1 activity and supporting the removal of damaged proteins in the animal models.
Why might some older adults respond differently?
In the study models, exercise may not fully restore repair when DEAF1 is extremely elevated or FOXO activity is very low. How these findings relate to differences among people has not been established.
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