Y-to-X chromosome translocation observed in two generations.

A family is reported in which the mother and two sons are carriers of a Y-X translocation. The distal segment of the short arm of the X chromosome appears to have been deleted to give place to a translocation of the distal part of the long arm of the Y chromosome. Apart from short stature the mother is essentially free of stigmata, while the sons show a combination of mental retardation, hypertelorism, simian creases, clinodactyly, scanty palmar lines, and dry fragile skin. The cases described are discussed against the background of the few known previously published cases.