The earliest ever recorded case of the genetic condition Klinefelter Syndrome has just been discovered – in a 1,000-year-old skeleton excavated from an archeological site in Portugal.
Klinefelter syndrome was only diagnosed for the first time in 1942 but now a Portuguese skeleton from the 11th-century AD has been found with the same genetic signature.
DNA extracted from the 1,000-year-old skeleton reveals the man had Klinefelter syndrome, which is a super rare genetic condition that gives men and extra X chromosome.