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Title: Y chromosome in Turner syndrome: detection of hidden mosaicism and the report of a rare X;Y translocation case
Authors: Sales Bispo, Adriana Valeria
Buregio-Frota, Pollyanna
Santos, Luana Oliveira dos
Leal, Gabriela Ferraz
Duarte, Andrea Rezende
Araujo, Jacqueline
Silva, Vanessa Cavalcante da [UNIFESP]
Cartaxo Muniz, Maria Tereza
Liehr, Thomas
Santos, Neide
Universidade Federal de Pernambuco (UFPE)
Inst Med Integral Prof Fernando Figueira IMIP
Hosp Oswaldo Cruz UPE
Universidade Federal de São Paulo (UNIFESP)
Inst Ciencias Biol
Univ Jena
Keywords: gonadoblastoma
Issue Date: 1-Jan-2014
Publisher: Csiro Publishing
Citation: Reproduction Fertility and Development. Collingwood: Csiro Publishing, v. 26, n. 8, p. 1176-1182, 2014.
Abstract: Turner syndrome (TS) is a common genetic disorder in females associated with the absence of complete or parts of a second sex chromosome. in 5-12% of patients, mosaicism for a cell line with a normal or structurally abnormal Y chromosome is identified. the presence of Y-chromosome material is of medical importance because it results in an increased risk of developing gonadal tumours and virilisation. Molecular study and fluorescence in situ hybridisation approaches were used to study 74 Brazilian TS patients in order to determine the frequency of hidden Y-chromosome mosaicism, and to infer the potential risk of developing malignancies. Additionally, we describe one TS girl with a very uncommon karyotype 46,X,der(X)t(X;Y)(p22.3?2;q11.23) comprising a partial monosomy of Xp22.3?2 together with a partial monosomy of Yq11.23. the presence of cryptic Y-chromosome-specific sequences was detected in 2.7% of the cases. All patients with Y-chromosome-positive sequences showed normal female genitalia with no signs of virilisation. Indeed, the clinical data from Y-chromosome-positive patients was very similar to those with Y-negative results. Therefore, we recommend that the search for hidden Y-chromosome mosaicism should be carried out in all TS cases and not be limited to virilised patients or carriers of a specific karyotype.
ISSN: 1031-3613
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