Expression and downregulation of WNT signaling pathway genes in rhesus monkey oocytes and embryos

Molecular Reproduction and Development
Ping ZhengKeith Latham

Abstract

Mammalian WNT genes encode secreted glycoproteins that are conserved homologues of the Drosophila Wingless gene, which plays a crucial role in Drosophila development. Recently, WNT pathway signaling has been implicated in ovarian development, oogenesis, and early development. We sought to evaluate whether these genes may contribute to the formation of healthy human oocytes or embryos, and whether the expression of these genes could provide informative markers of human oocyte and embryo quality. To do this, we employed the primate embryo gene expression resource (PREGER; www.preger.org) to examine expression of mRNAs encoding 38 components of the WNT signaling pathway in rhesus monkey oocytes and embryos as a nonhuman primate model. We observed considerable conservation between rhesus monkey and mouse of expression of WNT, FZD, and effector gene mRNAs, and a generalized downregulation of genes encoding key components of the WNT signaling pathway during preimplantation development. Our results support a role for WNT signaling during oocyte growth or maturation, but not during preimplantation development. Additionally, we observed differences between in vitro cultured and in vivo developing blastocysts, indicating possible effects...Continue Reading

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Aug 14, 2008·Physiological Genomics·Young S LeeCatherine A Vandevoort
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