Determinação do fenótipo sexual em uma criança com Mosaicismo 45,X/46,X,Idic(Yp): importância da proporção relativa da linhagem 45,X no tecido gonadal
Arquivos
Data
2006-12-31
Autores
Guedes, Alexis Dourado 
Orientadores
Verreschi, Ieda Therezinha do Nascimento
Tipo
Dissertação de mestrado
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Resumo
We report here on a girl who, despite her 45,X/46,X,der(Y) karyotype, showed no signs of virilization or physical signs of the Ullrich-Turner syndrome [UTS], except for a reduced growth rate. After prophylactic gonadectomy due to the risk of developing gonadoblastoma, the gonads and peripheral blood samples were analyzed by fluorescence in situ hybridization [FISH] and polymerase chain reaction [PCR] to detect Y-specific sequences. These analyses allowed us to characterize the Yderived chromosome as being an isodicentric Yp chromosome [idic(Yp)] and showed a pronounced difference in the distribution of the 45,X/46,X,idic(Yp) mosaicism between the two analyzed tissues. It was shown that, although in peripheral blood almost all cells (97.5%) belonged to the idic(Yp) line with a duplicated SRY gene, this did not determine any degree of male sexual differentiation in the patient, as in the gonads the predominant cell line was 45,X (60%).
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Citação
GUEDES, Alexis Dourado. Determinação do Fenótipo Sexual em uma Criança com Mosaicismo 45,X/46,X,Idic(Yp): Importância da Proporção Relativa da Linhagem 45,X no Tecido Gonadal. 2006. Dissertação (Mestrado) - Universidade Federal de São Paulo (UNIFESP), São Paulo, 2006.