The h-y antigen

C - Chemistry – Metallurgy – 07 – K

Patent

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C07K 14/705 (2006.01) A61K 38/08 (2006.01) A61K 38/17 (2006.01) A61K 39/00 (2006.01) A61K 47/48 (2006.01) C07K 7/06 (2006.01) C07K 14/725 (2006.01) C07K 16/28 (2006.01) A61K 38/00 (2006.01) C12N 5/06 (2006.01) C12N 5/08 (2006.01)

Patent

CA 2224894

H-Y is a transplantation antigen that can lead to rejection of HLA-matched male organ and bone marrow grafts by female recipients, and may play a role in pregnancy and spermatogenesis. However, the origin and function of H-Y antigens has eluded researchers for 40 years. We show that one human H-Y peptide antigen presented by HLA-B7 is an 11 residue peptide derived from SMCY, an evolutionarily conserved Y chromosomal protein. A homologous gene on the X chromosome, SMCX, differs by two residues in the same region. We also show a peptide antigen recognized by two HLA-A2.1 restricted T cell clones, which is also encoded by SMCY. The identification of H-Y offers prospects for improvements in transplantation outcome, prenatal diagnosis and fertilization strategies.

H-Y est un antigène de transplantation qui peut conduire au rejet, par les receveuses, de greffes d'organe mâle à typologie HLA et de moelle osseuse, et qui peut jouer un rôle dans la gestation et la spermatogénèse. Toutefois, l'origine et la fonction des antigènes H-Y a échappé aux chercheurs pendant 40 ans. Nous montrons qu'un antigène peptique H-Y humain présenté par LHA-B7 est un reste peptique 11 dérivant de SMCY qui est une protéine chromosomique Y d'évolution conservée. SMCX, un gène homologue sur le chromosome X, diffère par deux restes dans la même région. Nous montrons également un antigène peptique reconnu par deux clones de lymphocytes T restreints à HLA-A2.1 qui est également codé par SMCY. L'identification de H-Y offre des perspectives d'avenir pour des améliorations concernant le résultat de transplantations, le diagnostic prénatal et les stratégies de fertilisation.

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