A massive scientific initiative to decode how aging reshapes the human body reached a major milestone this month. The National Institutes of Health (NIH) Cellular Senescence Network (SenNet) published its first wave of discoveries, highlighted by a cover commentary in the journal Cell led by Rong Fan, PhD, Harold Hodgkinson Professor of Biomedical Engineering at Yale School of Engineering and Applied Science and of Pathology at Yale School of Medicine, alongside researchers from nine other institutions.
Published on June 11, the article establishes a scientific framework for dozens of interconnected studies that are now appearing across top-tier journals, including Nature Aging, Nature Genetics, and Molecular Cell. Together, they represent the first coordinated effort to map senescent cells—damaged or aged cells that stop dividing but refuse to die—at single-cell and spatial resolution.
When cellular senescence occurs, these “zombie cells” accumulate over time. They secrete harmful chemicals that trigger inflammation and damage surrounding tissue. This process drives aging and fuels chronic diseases like arthritis, cancer, and Alzheimer’s disease.
“Cellular senescence is a fundamental hallmark of aging, yet we still know surprisingly little about where these cells reside in the human body and how they interact with their surrounding tissue environments,” says Fan, a member of the Yale Center for Research on Aging (Y-Age) and Yale Cancer Center. “SenNet is creating the first reference atlas of human senescence, providing a foundation for understanding senescence biology in aging and developing future interventions.”
Yale has played a key role in the SenNet initiative through an interdisciplinary team of investigators, including Fan and YSM faculty members Stephanie Halene, MD, Dr Med; Mina Xu, MD; and Yuval Kluger, PhD, in the Yale SenNet Human Tissue Mapping Center (TMC) and the murine TMC led by Deep Dixit, PhD, DVM, Director of Y-Age, as well as Ruth Montgomery, PhD, whose expertise spans aging biology, immunology, pathology, hematology, computational biology, and data science.
One of the new YSM-led SenNet studies in this interconnected collection, published in Cell Press Blue, offers a breakthrough look at “immunosenescence”—the aging of the immune system, and provides one of the first comprehensive maps of immune aging in humans.
The researchers analyzed human lymph nodes from donors of various ages, ranging from childhood to old age. They discovered that in older tissues there were localized hotspots of dysfunctional immune cells called B cells. This specific decay helps explain why our immune systems weaken as we get older, the researchers say.
The broader SenNet collection includes new cellular senescence atlases for the brain, liver, and skin. It also introduces advanced artificial intelligence tools to classify different types of aged cells. Crucially, the data reveal that senescence is not a single state. Instead, it is a diverse spectrum of cellular profiles, which scientists call “senotypes,” that vary by tissue and disease.
As the project expands, scientists hope this open-source Human Senescence Atlas will accelerate precision therapies. The ultimate goal is not just to extend lifespan, but to improve human healthspan—the number of years we live healthy, disease-free lives.
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