1997
DOI: 10.1590/s0100-84551997000400028
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Experience with molecular and cytogenetic diagnosis of fragile X syndrome in Brazilian families

Abstract: We report on the cytogenetic and DNA analysis of 55 families with the fragile X (FMR-1 locus) mutation (318 individuals and 15 chorionic villi samples). A total of 129 males were investigated, 54 mentally normal and 75 presenting mental retardation. Among the 54 normal males, 11 had the premutation, and none expressed the fragile site. The full mutation was detected in 73 retarded males, and 14 (18%) presented a premutation along with the full mutation (mosaics). All of them manifested the fragile site. The fr… Show more

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“…O estudo molecular estendeu-se às famílias dos pacientes portadores da mutação completa, sendo detectados até o momento, 9 mulheres pré-mutadas, e 1 mutada não portadora de retardo mental. Nesta última justificado pelo padrão preferencial de inativação do cromossomo X mutado 23 .…”
Section: Discussionunclassified
“…O estudo molecular estendeu-se às famílias dos pacientes portadores da mutação completa, sendo detectados até o momento, 9 mulheres pré-mutadas, e 1 mutada não portadora de retardo mental. Nesta última justificado pelo padrão preferencial de inativação do cromossomo X mutado 23 .…”
Section: Discussionunclassified