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Type: Journal article
Title: Differential expression of oxygen-regulated genes in bovine blastocysts
Author: Harvey, A.
Navarrete Santos, A.
Kirstein, M.
Kind, K.
Fischer, B.
Thompson, J.
Citation: Molecular Reproduction and Development, 2007; 74(3):290-299
Publisher: Wiley-Liss
Issue Date: 2007
ISSN: 1040-452X
Abstract: Low oxygen conditions (2%) during post-compaction culture of bovine blastocysts improve embryo quality, which is associated with a small yet significant increase in the expression of glucose transporter 1 (GLUT-1), suggesting a role of oxygen in embryo development mediated through oxygen-sensitive gene expression. However, bovine embryos to at least the blastocyst stage lack a key regulator of oxygen-sensitive gene expression, hypoxia-inducible factor 1α (HIF1α). A second, less well-characterized protein (HIF2α) is, however, detectable from the 8-cell stage of development. Here we use differential display to determine additional gene targets in bovine embryos in response to low oxygen conditions. While development to the blastocyst stage was unaffected by the oxygen concentration used during post-compaction culture, differential display identified oxygen-regulation of myotrophin and anaphase promoting complex 1 expression, with significantly lower levels observed following culture under 20% oxygen than 2% oxygen. These results further support the hypothesis that the level of gene expression of specific transcripts by bovine embryos alters in response to changes in the oxygen environment post-compaction. Specifically, we have identified two oxygen-sensitive genes that are potentially regulated by HIF2 in the bovine blastocyst.
Keywords: Cells, Cultured
RNA, Messenger
Embryo Culture Techniques
Polymerase Chain Reaction
Cell Cycle
Gene Expression Regulation, Developmental
Molecular Sequence Data
DOI: 10.1002/mrd.20617
Appears in Collections:Aurora harvest
Obstetrics and Gynaecology publications

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