The unbalanced offspring of the male carriers of the 11q;22q translocation: nondisjunction at meiosis II in a balanced spermatocyte |
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Authors: | P Simi M Ceccarelli A Barachini G Floridia O Zuffardi |
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Institution: | (1) Laboratorio di Citogenetica, Clinica Pediatrica, Universitá di Pisa, Pisa, Italy;(2) Biologia Generale e Genetica Medica Universtá di Pavia, C.P. 217, I-27100 Pavia, Italy |
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Abstract: | Summary Carriers of the standard translocation t(11;22) (q23.3;q11.2) produce only one type of unbalanced offspring, a tertiary trisomy resulting into the karyotype 47,XX or XY, +der(22)t(11;22)(q23.3;q11.2), usually derived from the mother. The exception is one single patient 47,XY,t(11;22)(q23.3;q11.2),+der(22)t(11;22) (q23.3;q11.2)pat. We report a second case with the same karyotype, also of paternal origin. Thus, the rare unbalanced offspring of a carrier father (only 5 cases known) may receive a supernumerary der(22), as a consequence of tertiary trisomy, but also as a consequence of nondisjunction at meiosis II of a balanced spermatocyte. |
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