Unbalanced mosaic karyotypes with different structural abnormalities involving a common chromosome region: Report of two cases

We report on 2 cases with different de novo unbalanced mosaic karyotypes in which each cell line had a different structural abnormality involving a common chromosome region: 46,XX,del(11)(q23.3)/46,XX,?11,+der(11)t(11;?)(q23.3;?) and 46,X,idic(Xq)/46,X,idic(Xq),?12,+der(12)t(X;12)(p11.2;p13.3). Molecular-cytogenetic analysis confirmed the origin of the derivative 12 chromosome in the latter. We present a literature review of reports with mosaic cell lines of structural chromosome abnormalities that share the same chromosome breakpoint. © 1993 Wiley-Liss, Inc.     

原发闭经表型的细胞遗传学病因研究

目的:探讨原发闭经表型的细胞遗传学病因。方法:运用常规的染色体核型分析技术及FISH、C-带和Q-带技术,分析25例原发闭经表型患者的染色体核型。结果:25例原发闭经表型病例中,18例核型异常,占72.0%。异常核型病例分别为:45,X 8例、46,XY 2例,等臂X 1例、嵌合核型4例(分别为45,X细胞系与不同的结构异常性染色体细胞系的嵌合体)、X长臂末端缺失1例、X-常染色体平衡易位2例。除这18例异常核型患者外,尚有7例为先天性无子宫、无阴道的原发闭经患者未检出核型异常。结论:X染色体数目单体、X结构异常、X染色体数目单体细胞系与结构异常性染色体细胞系的嵌合体核型、XY性发育异常(DSD)、X-常染色体平衡易位都可导致原发闭经表型。常规G-显带技术与C-带、Q-带技术及FISH技术相互结合,有助于进一步准确诊断核型。