LIFESTYLE

Why Is Male Life Expectancy Lower Than Women's?

29/04/2014 11:17 BST | Updated 29/04/2014 11:59 BST
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It is generally acknowledged than men have a shorter life expectancy than women. The current life expectancy for men is 79.5 years old in the UK, while women can be expected to live to an average of 82.5 years old - and this is echoed across the globe.

But why do men die before women?

A recent study, led by Uppsala University researchers, shows a correlation between a loss of the Y chromosome in blood cells and both a shorter life span and higher mortality from cancer in other organs.

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Men have a shorter average life span than women and both the incidence and mortality in cancer is higher in men than in women. However, the mechanisms and possible risk factors behind this sex-disparity are largely unknown. Alterations in DNA of normal cells accumulate throughout our lives and have been linked to diseases such as cancer and diabetes.

In a study recently published in the journal Nature Genetics an international team of researchers have analysed the DNA in blood samples from a group of more than 1,600 elderly men. They found that the most common genetic alteration was a loss of the Y chromosome in a proportion of the white blood cells.

The group of men was studied for many years and the researchers could detect a correlation between the loss of the Y chromosome and shorter survival.

"Men who had lost the Y chromosome in a large proportion of their blood cells had a lower survival, irrespective of cause of death. We could also detect a correlation between loss of the Y chromosome and risk of cancer mortality", says Lars Forsberg, researcher at the Department of Immunology, Genetics and Pathology, Uppsala University, who has led the study.

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The Y chromosome is only present in men and the genes contained on the Y chromosome have so far mostly been associated with sex determination and sperm production.

"You have probably heard before that the Y chromosome is small, insignificant and contains very little genetic information. This is not true. Our results indicate that the Y chromosome has a role in tumour suppression and they might explain why men get cancer more often than women. We believe that analyses of the Y chromosome could in the future become a useful general marker to predict the risk for men to develop cancer", says Jan Dumanski, professor at the Department of Immunology, Genetics and Pathology, Uppsala University, and responsible for the study.