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English Abstract
Journal Article
[Genetic analysis of a 46,XY female with sex reversal due to duplication of NR0B1 gene].
Zhonghua Yi Xue Yi Chuan Xue za Zhi = Zhonghua Yixue Yichuanxue Zazhi = Chinese Journal of Medical Genetics 2018 December 11
OBJECTIVE: To explore the pathogenesis of a 46,XY female with sex reversal.
METHODS: Peripheral blood lymphocytes of the patient were subjected to G-banding karyotype analysis. Sex chromosomes were analyzed with fluorescence in situ hybridization (FISH). SRY gene was analyzed by Sanger sequencing. The whole exome of the patient was subjected to next generation sequencing. Copy number variations (CNVs) of the NR0B1, SF1, SRY, SOX9 and WNT4 genes were validated by multiplex ligation-dependent probe amplification (MLPA).
RESULTS: The patient had a 46,XY karyotype. FISH analysis showed that her sex chromosomes were X and Y. No mutation was found in the SRY gene, and no pathogenic mutation was detected in her exome. However, a duplication spanning approximately 67.31 kb encompassing the MAGEB1, MAGEB3, MAGEB4 and NR0B1 genes at Xp21, was predicted by software analysis. MLPA confirmed duplication of the NR0B1 gene in the patient and her mother.
CONCLUSION: A duplication fragment of Xp21 encompassing the NR0B1 gene in the 46,XY female with sex reversal is transmitted from her asymptomatic carrier mother. Attention should be paid towards the insidious nature and high morbidity of this duplication.
METHODS: Peripheral blood lymphocytes of the patient were subjected to G-banding karyotype analysis. Sex chromosomes were analyzed with fluorescence in situ hybridization (FISH). SRY gene was analyzed by Sanger sequencing. The whole exome of the patient was subjected to next generation sequencing. Copy number variations (CNVs) of the NR0B1, SF1, SRY, SOX9 and WNT4 genes were validated by multiplex ligation-dependent probe amplification (MLPA).
RESULTS: The patient had a 46,XY karyotype. FISH analysis showed that her sex chromosomes were X and Y. No mutation was found in the SRY gene, and no pathogenic mutation was detected in her exome. However, a duplication spanning approximately 67.31 kb encompassing the MAGEB1, MAGEB3, MAGEB4 and NR0B1 genes at Xp21, was predicted by software analysis. MLPA confirmed duplication of the NR0B1 gene in the patient and her mother.
CONCLUSION: A duplication fragment of Xp21 encompassing the NR0B1 gene in the 46,XY female with sex reversal is transmitted from her asymptomatic carrier mother. Attention should be paid towards the insidious nature and high morbidity of this duplication.
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