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Many men carry an extra chromosome, without even knowing about it

A study of over 207,000 men participating in the UK Biobank has revealed that almost 1 in 500 men have an extra X or Y chromosome.

@AdamHuntTT
Published Jun 16, 2022 8:32 AM CDT   |   Updated Mon, Jul 11 2022 8:27 PM CDT

A study on the extra chromosomes titled "Detection and characterization of male sex chromosome abnormalities in the UK Biobank study" has been published in the journal Genetics in Medicine.

Many men carry an extra chromosome, without even knowing about it 01 | TweakTown.com

Data from over 207,000 men included in the UK Biobank has revealed that an extra sex chromosome, either an X or Y, may be prevalent in as many as 1 in 500 men. Typically, men are born with one X chromosome and one Y chromosome, however, in the dataset, were 213 men with an extra X chromosome, resulting in the XXY genotype, and 143 men with an extra Y chromosome, resulting in the XYY genotype.

Also referred to as 47,XXY and 47,XYY, the genotypes are called Klinefelter syndrome and Jacobs syndrome, respectively. Only 23% of those with Klinefelter syndrome had a known diagnosis, while only 0.7% of those with Jacobs syndrome were diagnosed. However, the latter has much more subtle characteristics that could contribute to a lower diagnosis rate.

"We were surprised at how common this is. It had been thought to be pretty rare," said Dr. Ken Ong, a pediatric endocrinologist and a co-senior author of the study.

You can read more from the study here.

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NEWS SOURCES:livescience.com, doi.org

Adam grew up watching his dad play Turok 2 and Age of Empires on a PC in his computer room, and learned a love for video games through him. Adam was always working with computers, which helped build his natural affinity for working with them, leading to him building his own at 14, after taking apart and tinkering with other old computers and tech lying around. Adam has always been very interested in STEM subjects, and is always trying to learn more about the world and the way it works.

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