特殊复杂染色体重排1例男性携带者的遗传学分析与PGT-SR助孕结局
Genetic analysis and PGT-SR outcome of a male carrier of exceptional complex chromosome rearrangement
刘顿 1董云巧 1陈创奇 1于行素 1燕瑾 1刘风华 1张曦倩1
作者信息
- 1. 广东省妇幼保健院生殖医学中心,广东 广州 510000
- 折叠
摘要
目的:探讨1 例特殊染色体复杂重排(CCR)男性携带者的临床特征、遗传学特征与胚胎植入前染色体结构重排筛查(PGT-SR)的助孕结局.方法:通过改良高分辨G显带技术和低深度高通量全基因组测序技术(WGLCS)分别对该男性患者的细胞染色体核型和分子核型进行分析.此外,利用二代测序技术(NGS)对该男性患者进行单精子染色体拷贝数(CNV)分析和 PGT-SR 助孕.结果:该男性患者核型为:46,XY,der(5)inv(5)(q14.3q23.2)t(5;14;11)(q23.2;q31.1;q21),der(11)t(5;14;11);der(14)t(5;14;11),其易位断点位于基因间区.单精子测序结果显示该男性精子中20.0%(7/35)为正常单倍体.PGT-SR结果显示正常/平衡的胚胎比率为25.0%(4/16),经过2 次冷冻的单囊胚移植后,夫妇成功活产一健康男婴.此外,对已报道的男性CCRs携带者进行了文献回顾,总结了其正常/平衡精子比率和PGT-SR结局.结论:本研究提示男性CCRs携带者的正常单倍体精子比率可能高于理论预测,通过PGT-SR可有效改善其妊娠结局,在遗传咨询方面为他们提供了有价值的数据.
Abstract
Objective:To investigate the clinical and genetic characteristics of a male carrier of exceptional complex chromo-some rearrangement(CCR)and the outcome of preimplantation genetic testing for chromosomal structural rearrangement(PGT-SR).Methods:Using the modified high resolution G banding technique and whole-genome low-coverage sequencing(WGLCS),we analyzed the cellular karyotype and molecular karyotype of a male carrier of CCR,performed an analysis of the single-sperm chromosome copy number and conducted PGT-SR for the patient by next-generation sequencing(NGS).In addition,we reviewed the literature on repor-ted male carriers of CCRs and summarized their normal/balanced sperm ratios and PGT-SR outcomes.Results:The karyotype of the patient was 46,XY,der(5)inv(5)(q14.3q23.2)t(5;14;11)(q23.2;q31.1;q21),der(11)t(5;14;11);der(14)t(5;14;11),with the translocation breakpoints located in the intergenic region.Single-sperm sequencing revealed 20.0%(7/35)of normal haploids in the male's spermatozoa,and the results PGT-SR showed a proportion of 25.0%(4/16)of normal/balanced embryos.After thawing and transferring of 2 euploid blastocysts,a healthy male infant was successfully delivered.Conclusion:The proportion of normal hap-loids in the spermatozoa of male CCR carriers may be higher than theoretically predicted,and PGT-SR can effectively improve the preg-nancy outcome in male CCR carriers and provide valuable data for genetic counseling.
关键词
复杂染色体重排/胚胎植入前遗传学检测/单精子染色体拷贝数/遗传咨询Key words
complex chromosomal rearrangement/preimplantation genetic testing/single-sperm chromosome copy number/ge-netic counseling引用本文复制引用
基金项目
广州市科技计划(202102021170)
出版年
2024
NETL
NSTL
万方数据