title: A gene controlling H-Y antigen on the X chromosome. Tentative assignment by deletion mapping to Xp223.
abstract: The existence of a strict correlation between presence of testicular tissue and presence of H-Y antigen in mammals and man leads to the conclusion that H-Y antigen is an essential differentiation factor in testicular morphogenesis. Presence of low titers of this differentiation antigen even in fertile females indicates that its morphogenetic effect depends on a threshold. Here, studies on H-Y antigen in female individuals with various deletions of the X-chromosome are reported. It turns out that deletion of Xp results in the synthesis of reduced amounts of H-Y antigen, while deletion of Xq does not. In a fertile female with only Xp223 deleted due to an X/Y translocation, including the distal Yq, presence of a reduced H-Y titer allows for the tentative assignment of a controlling gene repressing the H-Y structural gene. From the cases studied, it follows that the H-Y structural gene is autosomal and under the control of X- and Y-linked genes. The conception emerges that interaction between X- and Y-linked genes or their products results in variation of the H-Y antigen titer. The fate of the indifferent gonadal anlage to differentiate into the male or the female direction will depend on the titer of H-Y antigen reached by the action or interaction of the controlling genes involved.
mesh_terms: D000293:Adolescent; D000328:Adult; D002872:Chromosome Deletion; D002874:Chromosome Mapping; D003601:Cytotoxicity Tests, Immunologic; D005260:Female; D006182:H-Y Antigen / Q000235:genetics*; D006801:Humans; D012732:Sex Determination Analysis
chemical_list: D006182:H-Y Antigen