A massive Mayo Clinic-led study analyzed over 90 trillion DNA letters to detect somatic mutations — genetic changes that accumulate in cells over a lifetime — across noncancerous human tissues. Published in Cell, the research could help scientists understand how these mutations drive cancer and age-related diseases, and may one day identify people at higher cancer risk before symptoms appear.
A landmark Mayo Clinic-led study published in Cell has mapped how DNA mutations accumulate in noncancerous human tissues across the entire genome — a breakthrough that could reshape our understanding of cancer, aging, and other diseases. Drawing on more than 90 trillion DNA letters of sequencing data, the research is the flagship paper from the NIH's Somatic Mosaicism across Human Tissues (SMaHT) Network, a collaboration of over 300 scientists from more than two dozen U.S. institutions.
Unlike inherited mutations, somatic mutations arise after conception and build up as cells divide throughout life. These changes — ranging from single-letter DNA swaps to large deletions and rearrangements — can alter cell behavior and contribute to cancer, cardiovascular disease, and neurodevelopmental conditions. The study compared multiple sequencing approaches to find the most effective detection methods.
By the Numbers
Why it matters: Better detection of somatic mutations could eventually help clinicians identify individuals at elevated cancer risk and catch precancerous changes before symptoms develop — opening the door to earlier, more targeted interventions.
