Incerti B, Guioli S, Pragliola A, Zanaria E, Borsani G, Tonlorenzi R, Bardoni B, Franco B, Wheeler D, Ballabio A
Institute for Molecular Genetics, Baylor College of Medicine, Houston, Texas 77030.
Nat Genet. 1992 Dec;2(4):311-4. doi: 10.1038/ng1292-311.
The recently identified gene for X-linked Kallmann syndrome (hypogonadotropic hypogonadism and anosmia) has a closely related homologue on the Y chromosome. The X and Y copies of this gene are located in a large region of X/Y homology, on Xp22.3 and Yq11.2, respectively. Comparison of the structure of the X-linked Kallmann syndrome gene and its Y homologue shed light on the evolutionary history of this region of the human sex chromosomes. Our data show that the Y homologue is not functional. Comparative analysis of X/Y sequence identity at several loci on Xp22.3 and Yq11.2 suggests that the homology between these two regions is the result of a complex series of events which occurred in the recent evolution of sex chromosomes.
