Expanding the genetic and phenotypic spectrum of the subcortical maternal complex genes in recurrent pre‐implantation embryonic arrest

Expanding the genetic and phenotypic spectrum of the subcortical maternal complex genes in recurrent pre‐implantation embryonic arrest:

Abstract

The subcortical maternal complex (SCMC) is an oocyte‐to‐embryo‐specific maternal functional module. Some variants of SCMC genes that contribute to pre‐implantation embryonic arrest have been identified. However, more novel variants should be identified to broaden the phenotypic and genetic spectrum of SCMC genes and establish their roles in embryonic development. We identified 13 novel variants in the SCMC genes, TLE6, NLRP5, NLRP2 and PADI6, from 10 of a total of 50 infertile females with recurrent preimplantation embryonic arrest. Six variants in TLE6 were found in five patients with embryonic arrest, accompanied by direct cleavage and severe fragmentation at the cleavage stage. Three patients carried NLRP5 variants, and one patient each who carried NLRP2 and PADI6 variants had subsequent poor or failed fertilization and cleavage arrest with a relatively lower ratio of severely fragmented embryos. Our findings expand the genetic and phenotypic spectrum of SCMC gene variants associated with human embryogenesis and might help lay the foundation for the genetic diagnosis of female infertility.