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Recent studies show that about 40% of men in their 60s have already lost the Y chromosome in part of their cells. By 90, this number can reach 57%. The loss of this chromosome has been associated with cardiovascular diseases, Alzheimer’s, and cancer, and may explain why men live less than women in aging.
As men age, some of their cells begin to lose the Y chromosome, the one that determines male sex. For a long time, scientists believed that this loss would not have a significant impact on health. The Y chromosome is relatively small compared to other human chromosomes and contains only a few dozen protein-coding genes. This characteristic led many researchers to treat the loss of this chromosome as a minor genetic detail, almost irrelevant. However, recent research is radically changing this view.
Studies published in recent years indicate that the loss of the Y chromosome may be associated with cardiovascular diseases, Alzheimer’s, different types of cancer, and shorter life expectancy. It is estimated that about 40% of men in their 60s already show some loss of this chromosome in part of their cells. By age 90, this percentage can reach 57%. The phenomenon is silent, progressive, and may be one of the keys to understanding why certain diseases affect men more than women.
What is the loss of the Y chromosome and how does it happen in aging
The Y chromosome is the smallest of the 46 human chromosomes and is present only in men, forming the XY pair that defines male sex. With aging, some cells in the male body begin to lose this chromosome during the natural process of cell division.
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This change does not occur in all cells at once. Instead, it creates a mix of normal cells and cells that have lost the Y chromosome, a phenomenon that geneticists call mosaicism.
Once a cell loses the Y chromosome, all cells that originate from it will also lack it. Researchers suspect that cells without the Y chromosome may grow more rapidly, allowing them to accumulate in certain tissues and potentially in tumors.
This process is gradual and silent: the man feels nothing, shows no visible symptoms, and in most cases, never discovers that part of his cells no longer carries the chromosome that defined his biological sex.
The numbers that scare: 40% at 60 years, 57% at 90
With the advancement of genetic analysis techniques, scientists have been able to accurately measure the frequency of Y chromosome loss in different age groups. The results are impressive: about 40% of men in their 60s already show some degree of loss of this chromosome in their blood cells.
By age 90, the percentage rises to 57%. This means that most men who reach advanced ages are living with cells that have lost the Y chromosome without knowing it.
These numbers have transformed what seemed to be a genetic curiosity into a priority research field. If nearly half of men over 60 are losing the Y chromosome, understanding the consequences of this loss is essential for aging medicine.
The discovery also raised a provocative hypothesis: what if the progressive loss of this chromosome is one of the reasons why men, on average, live less than women?
Cardiovascular diseases, Alzheimer’s, and cancer: what does the Y chromosome have to do with it
In recent years, the loss of the Y chromosome has been associated with a range of serious health problems. Studies relate the phenomenon to cardiovascular diseases, which are the leading cause of death among men worldwide.
There is also evidence of association with Alzheimer’s, different types of cancer, and worse prognosis in various medical conditions. The hypothesis is that cells without the Y chromosome may compromise the functioning of the immune system, making the body more vulnerable to chronic inflammation and the development of tumors.
There are also indications that men with greater loss of the Y chromosome had worse outcomes during the COVID-19 pandemic. This correlation may help explain part of the mortality difference observed between men and women during the health crisis.
Despite these associations, scientists have not yet been able to establish with certainty whether the loss of the chromosome directly causes these diseases or if it arises as a consequence of other aging-related processes. The distinction between cause and correlation is the great challenge of current research.
Why men live less: the Y chromosome may be part of the answer
The difference in life expectancy between men and women is one of the most consistent patterns in global demographics. In almost every country, women live longer. Traditional explanations include hormonal, behavioral, and lifestyle differences.
Now, the progressive loss of the Y chromosome emerges as an additional biological factor that may contribute to this difference.
Women have two X chromosomes and do not have the Y chromosome. This means they are not subject to the same chromosomal loss phenomenon that affects men with age. If the loss of the Y chromosome indeed compromises the immune system and increases vulnerability to serious diseases, this may be a crucial piece of the longevity puzzle.
Researchers emphasize that it is still early for definitive conclusions, but the fact that millions of men are silently and progressively losing this chromosome already justifies increased attention from the scientific community.
What once seemed irrelevant may now change male aging medicine
The discovery that the loss of the Y chromosome has real health implications has changed the way scientists view this genetic component. What once seemed a relatively irrelevant genetic detail may, in fact, be a key piece to understanding why certain diseases become more common in men over the years.
This perspective paves the way for new diagnostic approaches and, potentially, for interventions that mitigate the effects of this loss.
In the future, routine blood tests may include checking for the loss of the Y chromosome as a risk indicator for cardiovascular diseases, cancer, and other conditions associated with male aging.
Science is just beginning to understand the full role of this chromosome in men’s health, but the evidence accumulated so far suggests that ignoring it was a mistake. The Y chromosome, no matter how small, may hold answers that medicine took decades to begin to seek.
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