EXCLUSIVELY PATERNAL X-CHROMOSOMES IN A GIRL WITH SHORT STATURE

A 13 1/2 year-old girl with short stature and very few Turner stigmata revealed 45,X/46,XX mosaicism with 90%-100% 46,XX cells in three sequ ential blood lymphocyte cultures. Molecular investigation of the paren tal origin of her X chromosomes revealed homozygosity for paternal X m arkers and an absence of maternal markers. Luteinizing hormone respons e to growth hormone releasing hormone was increased. Impaired gonadal function and shortness of stature in this case could be a result of th e mild mosaicism with a 45,X cell line and/or is a consequence of the paternal-only origin of her X chromosomes.