染色体嵌合型(CM)是胚胎植入前遗传检测(PGT)中可观察到的普遍现象。CM胚胎中滋养外胚层(TE)细胞的遗传状态不一定与未来发育成为胎儿的内细胞团(ICM)相同。部分低比例CM胚胎移植后仍能获得健康活产儿，但是其具有较高流产率等妊娠风险。为了对CM胚胎有更加全面的认识，本文拟就CM胚胎的定义、发生机制、分类、PGT技术、自我纠正机制、移植结局及处理原则等最新研究进展进行系统性阐述。 Chromosomal mosaicism (CM) is a common phenomenon in preimplantation genetic testing (PGT). In embryos with CM, genetic contents of trophoblastic ectodermal (TE) cells may be different from that of the inner cell mass (ICM) which will develop into the fetus. Embryos with low mosaic proportion could give rise to healthy live births after transplantation, but are accompanied with high pregnancy risks such as high abortion rate. In order to provide a more comprehensive understanding for CM embryos, this article has systematically summarized the recent progress of research on the definition, mechanism, classification, PGT techniques, self-correction mechanism, transplantation outcome and treatment principles for CM embryos.
Abstract
Chromosomal mosaicism (CM) is a common phenomenon in preimplantation genetic testing (PGT). In embryos with CM, genetic contents of trophoblastic ectodermal (TE) cells may be different from that of the inner cell mass (ICM) which will develop into the fetus. Embryos with low mosaic proportion could give rise to healthy live births after transplantation, but are accompanied with high pregnancy risks such as high abortion rate. In order to provide a more comprehensive understanding for CM embryos, this article has systematically summarized the recent progress of research on the definition, mechanism, classification, PGT techniques, self-correction mechanism, transplantation outcome and treatment principles for CM embryos.
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