Manipulations of mouse embryos prior to implantation result in aberrant expression of imprinted genes on day 9.5 of development

Human Molecular Genetics
Rocío Melissa RiveraMarisa S Bartolomei


In vitro culture of mouse embryos results in loss of imprinting. The aim of the present study was to examine how two of the techniques commonly used during assisted reproduction, namely embryo culture and embryo transfer, affect genomic imprinting after implantation in the mouse. F1 hybrid mouse embryos were subjected to three experimental conditions: control (unmanipulated), embryo transfer and in-vitro-culture followed by embryo transfer. Concepti were collected on d9.5 of development and allelic expression determination of ten imprinted genes (H19, Snrpn, Igf2, Kcnq1ot1, Cdkn1c, Kcnq1, Mknr3, Ascl2, Zim1, Peg3) was performed. Although control concepti had monoallelic imprinted gene expression in all tissues, both manipulated groups had aberrant expression of one or more imprinted genes in the yolk sac and placenta. Culture further exacerbated the effects of transfer by increasing the number of genes with aberrant allelic expression in extraembryonic, as well as embryonic tissues. Additionally, placentae of both groups of manipulated concepti exhibited reduced levels of Igf2 mRNA and increased levels of Ascl2 mRNA when compared with their unmanipulated counterparts. Furthermore, we show that biallelic expression of Kcnq1ot1 c...Continue Reading


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Related Concepts

Protein Methylation
RNA, Untranslated
Placenta Specimen
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IGF2 gene
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