Roughly 2,500-year-old DNA has revealed the first ancient person on record with Turner syndrome, a genetic condition in which a person has just a single X chromosome rather than two, a new study finds.
The individual, who died when they were 18 to 22 years old, likely hadn't gone through puberty, an analysis of the bones revealed. A further investigation of the remains revealed that the individual had mosaic Turner syndrome, as some cells had just one X chromosome while others had two.
