Y Chromosome Loss Hits 40% of 70-Year-Old Men, Raising Cancer and Heart Disease Risk
Updated
Updated · ScienceAlert · Jun 12
Y Chromosome Loss Hits 40% of 70-Year-Old Men, Raising Cancer and Heart Disease Risk
2 articles · Updated · ScienceAlert · Jun 12
Summary
Emerging genetic evidence suggests Y chromosome loss in aging men is not just a marker of aging but may actively drive cancer, heart disease, kidney disease and Alzheimer's.
Roughly 40% of 70-year-old men show Y loss in blood cells, rising to 57% by age 93, as researchers use newly completed Y-chromosome sequencing to probe its wider role in the body.
A 2022 mouse study linked Y-deficient immune cells in the heart to cardiovascular dysfunction and death, while clinical studies have tied the loss to earlier death and higher cancer risk in older men.
Bladder cancer has become a key focus: a 2023 study found up to 40% of older male patients lacked the Y chromosome in tumors, and 2025 research suggested Y-deficient immune cells are worse at attacking cancers.
The findings also feed a broader debate over the Y chromosome's future: it retains only 3% of its ancestral genes, yet some scientists argue the genes left are too important to disappear.
Can the deadly diseases caused by Y chromosome loss in aging men be prevented or even reversed?
The Y chromosome is vanishing. What does this mean for the future of men and human reproduction?
Why is the loss of the male chromosome, once harmless, now linked to cancer and heart disease?
The Impact of Mosaic Loss of Y Chromosome (mLOY) on Male Longevity, Disease Risk, and Public Health
Overview
Recent scientific breakthroughs have transformed our understanding of Mosaic Loss of Y chromosome (mLOY) in men. Once seen as a harmless sign of aging, mLOY is now recognized as the most common acquired mutation in men and a direct cause of many age-related diseases. Affecting a significant portion of older men, especially those over 70, mLOY is linked to shorter lifespan and poorer health. This shift in perspective highlights the importance of mLOY as a key factor in male health, emphasizing its role not just as a marker, but as a true driver of disease and aging.