Accelerated Cellular Aging Detected in Major Depressive Disorder Using the GrimAge Methylation Clock
Summary: DNA methylation markers in blood cells from people with Major Depressive Disorder (MDD) indicate a cellular age roughly two years older, on average, than markers from similarly aged individuals without the disorder.
Source: UCSF
Key findings: A multidisciplinary team at the University of California, San Francisco, in collaboration with partners, analyzed DNA methylation patterns in blood samples from people diagnosed with Major Depressive Disorder (MDD) and compared them with matched healthy controls. Using the epigenetic “GrimAge” clock—a DNA methylation-based algorithm trained to predict morbidity and mortality—the researchers found that individuals with MDD showed higher-than-expected methylation at sites used by GrimAge. These methylation patterns corresponded to greater predicted mortality risk and an average advancement of about two years in cellular age relative to chronological age.
Methylation is a chemical modification of DNA that can alter gene expression without changing the underlying genetic code. Certain combinations of methylation sites form epigenetic clocks that typically change in predictable ways with chronological aging. However, the pace of those changes differs between people. The GrimAge clock is notable because it was trained on time-to-death data and has consistently outperformed earlier epigenetic clocks in predicting both morbidity and mortality.
In this carefully screened study, both the MDD group and healthy controls were assessed to ensure they were free from overt, age-related physical illnesses at enrollment. The difference in GrimAge between groups persisted after the investigators adjusted for common lifestyle and risk factors such as smoking and body mass index (BMI), indicating the signal was not solely explained by those behaviors. The findings support the hypothesis that MDD may involve systemic biological processes that accelerate cellular aging, which could help explain the condition’s association with higher rates of cardiovascular disease, diabetes, neurodegenerative disease, and premature mortality.
“This is shifting the way we understand depression, from a purely mental or psychiatric disease, limited to processes in the brain, to a whole-body disease,” said Katerina Protsenko, a medical student at UCSF and lead author of the study. “This should fundamentally alter the way we approach depression and how we think about it — as a part of overall health.”
Owen Wolkowitz, MD, professor of psychiatry and co-senior author, emphasized the significance of linking depressive illness to accelerated cellular aging: “One of the things that’s remarkable about depression is that sufferers have unexpectedly higher rates of age-related physical illnesses and early mortality, even after accounting for things like suicide and lifestyle habits. That’s always been a mystery, and that’s what led us to look for signs of aging at the cellular level.”
Study design and methods: The research team measured GrimAge in blood-derived DNA from 49 unmedicated, somatically healthy individuals diagnosed with MDD and 60 age-matched healthy controls. GrimAge derives a biological age estimate from methylation signatures that have been associated with mortality. The investigators tested whether the GrimAge-based age acceleration metric (AgeAccelGrim) differed between groups and controlled for sex, current smoking status, and BMI in their analyses.
Results: Individuals with MDD had significantly greater AgeAccelGrim than healthy controls (p = 0.001), with a median excess cellular aging of approximately two years. This difference remained statistically significant (p = 0.015) after adjusting for sex, smoking, and BMI. The study is the first to demonstrate accelerated GrimAge specifically in MDD, linking an epigenetic predictor of mortality to a psychiatric diagnosis.
Interpretation and next steps: The researchers caution that these results do not yet establish cause and effect. It remains unclear whether MDD directly drives changes in DNA methylation, whether altered methylation contributes to depression, or whether both arise from shared genetic or environmental factors. Prior work has shown methylation alterations in other stress-related conditions, such as post-traumatic stress disorder, suggesting complex interactions between stress, psychiatric illness, and epigenetic regulation.
The team plans to investigate whether effective treatments for MDD—pharmacological or psychotherapeutic—can reverse or lessen methylation alterations associated with accelerated cellular aging. If methylation changes are dynamic and responsive to treatment, that would support the possibility of preventing or slowing the biological aging processes linked to MDD. Although GrimAge has been validated as a mortality predictor in other populations, future longitudinal studies are needed to determine whether elevated GrimAge in MDD predicts clinical outcomes and premature mortality in this specific group.
Authors and collaborations: Katerina Protsenko led the study. Co-senior authors include Owen M. Wolkowitz, MD; Synthia H. Mellon, PhD; and Victor I. Reus, MD. The work was conducted in collaboration with researchers including Ruoting Yang, Rasha Hammamieh, Marti Jett, and Aarti Gautam from the Walter Reed Army Institute of Research, Silver Spring, MD.
Funding: The research was supported by grants from the National Institute of Mental Health (R01-MH083784), the O’Shaughnessy Foundation, the Tinberg family, the UCSF Academic Senate, and the UCSF Research Evaluation and Allocation Committee (REAC). Additional support came from NIH/NCRR and the National Center for Advancing Translational Sciences through UCSF-CTSI grants UL1 RR024131 and TL-1 TR001871.
Disclosures: The authors report no financial relationships relevant to this article to disclose.
About this MDD research news
Source: UCSF
Contact: Jason Alvarez – UCSF
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Original research: “GrimAge, an epigenetic predictor of mortality, is accelerated in major depressive disorder.” The study is published in Translational Psychiatry and is available as open access.
Abstract (condensed): Major depressive disorder is linked to higher rates of age-related diseases and premature mortality. Epigenetic clocks, which estimate biological age from patterns of DNA methylation, can detect accelerated cellular aging. In this study of 49 somatically healthy, unmedicated individuals with MDD and 60 healthy controls, GrimAge showed significant age acceleration in the MDD group, corresponding to a median of two years of excess cellular aging. The difference remained significant after adjusting for sex, smoking, and BMI. These results support the idea that MDD is associated with accelerated cellular aging and introduce an epigenetic predictor of mortality into the study of psychiatric illness.