XX true hermaphroditism in Southern African Blacks: Exclusion of SRY sequences and uniparental disomy of the X chromosome |
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Authors: | Amanda B Spurdle Sara Shankman Michele Ramsay |
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Institution: | MRC Human Ecogenetics Research Unit, Department of Human Genetics, South African Institute for Medical Research and University of the Witwatersrand, Johannesburg, South Africa |
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Abstract: | A molecular investigation of 16 Bantu-speaking Black XX true hermaphrodites was undertaken in an attempt to determine the cause of the disorder. Y-specific sequences, including sequences mapping to the sexdetermining region of the Y, were shown to be absent from lymphocyte tissue of all 16 patients tested. Y chromosome sequences were also absent from the ovarian and testicular components of both ovotestes of a single XX true hermaphrodite, thus excluding gonadal mosaicism involving Y chromosome sequences. Since there is evidence for Xp genes involved in testis determination/differentiation, uniparental disomy of the X chromosome was investigated in 14 XXTH families. Uniparental disomy was excluded in 12 of the 14 families, and isodisomy was excluded in the remaining two cases. © 1995 Wiley-Liss, Inc. |
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Keywords: | XX true hermaphroditism SRY UPD |
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