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LINK Oldest Case Of Rare Genetic Condition That Sees Males With Extra X Chromosome Discovered | IFLScienceMissing | IFLScience

(I have a friend who has was born with an extra X chromosone. I have met several such persons. It is not as rare as most people think. It is only recorded when it is diagnosed and only diagnosed if it causes problems and the person can afford and has access to doctors who know to look for it.)

An unusually tall, wide-hipped man who died 1,000 years ago in Portugal was the oldest known carrier of Klinefelter syndrome, a rare genetic condition in which males are born with an extra copy of the X chromosome. Describing the case in The Lancet, researchers say that this discovery could shed light on the prevalence of genetic disorders throughout human history.

Most humans carry 23 pairs of chromosomes, one of which encompasses the sex chromosomes, known as X and Y. Biological females are born with two X chromosomes while biological males have one X and one Y, resulting in a total of 46 chromosomes.

However, people with Klinefelter syndrome are born with what’s known as the 47,XXY karyotype, meaning they have two X chromosomes and one Y. Thought to affect around 0.1 percent of genetic males, the condition is associated with a number of physical characteristics, such as above-average height, wide hips, small testes, and gynaecomastia – otherwise known as “man boobs”.

snytiger6 9 Aug 29
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