Presence of H‐Y antigen in female patients with sex‐chromosome mosaics and absence of testicular tissue

Abstract
H‐Y antigen was tested in five women with sex chromosome mosaicism and gonadal streaks. Three patients had a 45,X/46,XY or 46,X,der(Y) and two a 45,X/46,X,der(X) chromosome constitution. All patients were H‐Y antigen positive. Lack of testis differentiation in these women may be explained by subthreshold expression of H‐Y antigen, different H‐Y antigen molecules, and/or different tissue distribution of the chromosome mosaicism.