Roseane Lopes da Silva-Grecco1, Alessandra Bernadete Trovó-Marqui1, Tiago Alves de Sousa1, Lilian Da Croce1, Marly Aparecida Spadotto Balarin2,3. 1. Disciplina de Genética, ICBN, Universidade Federal do Triângulo Mineiro/UFTM, Uberaba, MG, Brazil. 2. Disciplina de Genética, ICBN, Universidade Federal do Triângulo Mineiro/UFTM, Uberaba, MG, Brazil. balarin@mednet.com.br. 3. Instituto de Ciências Biológicas e Naturais/ICBN, Disciplina de Genética, Universidade Federal do Triângulo Mineiro/UFTM, Praça Manoel Terra, 330, Uberaba, MG, CEP 38015-050, Brazil. balarin@mednet.com.br.
Abstract
OBJECTIVES: To investigate the presence of Y-chromosome sequences and determine their frequency in patients with Turner syndrome. METHODS: The study included 23 patients with Turner syndrome from Brazil, who gave written informed consent for participating in the study. Cytogenetic analyses were performed in peripheral blood lymphocytes, with 100 metaphases per patient. Genomic DNA was also extracted from peripheral blood lymphocytes, and gene sequences DYZ1, DYZ3, ZFY and SRY were amplified by Polymerase Chain Reaction. RESULTS: The cytogenetic analysis showed a 45,X karyotype in 9 patients (39.2 %) and a mosaic pattern in 14 (60.8 %). In 8.7 % (2 out of 23) of the patients, Y-chromosome sequences were found. This prevalence is very similar to those reported previously. The initial karyotype analysis of these patients did not reveal Y-chromosome material, but they were found positive for Y-specific sequences in the lymphocyte DNA analysis. CONCLUSION: The PCR technique showed that 2 (8.7 %) of the patients with Turner syndrome had Y-chromosome sequences, both presenting marker chromosomes on cytogenetic analysis.
OBJECTIVES: To investigate the presence of Y-chromosome sequences and determine their frequency in patients with Turner syndrome. METHODS: The study included 23 patients with Turner syndrome from Brazil, who gave written informed consent for participating in the study. Cytogenetic analyses were performed in peripheral blood lymphocytes, with 100 metaphases per patient. Genomic DNA was also extracted from peripheral blood lymphocytes, and gene sequences DYZ1, DYZ3, ZFY and SRY were amplified by Polymerase Chain Reaction. RESULTS: The cytogenetic analysis showed a 45,X karyotype in 9 patients (39.2 %) and a mosaic pattern in 14 (60.8 %). In 8.7 % (2 out of 23) of the patients, Y-chromosome sequences were found. This prevalence is very similar to those reported previously. The initial karyotype analysis of these patients did not reveal Y-chromosome material, but they were found positive for Y-specific sequences in the lymphocyte DNA analysis. CONCLUSION: The PCR technique showed that 2 (8.7 %) of the patients with Turner syndrome had Y-chromosome sequences, both presenting marker chromosomes on cytogenetic analysis.
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