Imagine the deep frustration of countless men who long to become fathers, only to face infertility due to a genetic condition they can't control. For those with Klinefelter syndrome, this painful ...

Genetics play a role in low testosterone for some men, but underlying causes vary widely. Many genes influence testosterone ...

Researchers at the University of Colorado Anschutz Medical Campus and collaborators across the country have conducted the largest and most diverse study of men with extra X or Y chromosomes in the US ...

Extra X chromosomes significantly increase the risk for systemic lupus erythematosus (SLE) and Sjögren disease, with the prevalence of these conditions being higher among patients with Klinefelter and ...