Please use this identifier to cite or link to this item:
https://hdl.handle.net/2440/8035
Citations | ||
Scopus | Web of Science® | Altmetric |
---|---|---|
?
|
?
|
Type: | Journal article |
Title: | Oxygen-regulated gene expression in bovine blastocysts |
Author: | Harvey, A. Kind, K. Pantaleon, M. Armstrong, D. Thompson, J. |
Citation: | Biology of Reproduction, 2004; 71(4):1108-1119 |
Publisher: | Soc Study Reproduction |
Issue Date: | 2004 |
ISSN: | 0006-3363 1529-7268 |
Statement of Responsibility: | A. J. Harvey, K. L. Kind, M. Pantaleon, D. T. Armstrong, and J.G . Thompson |
Abstract: | Oxygen concentrations used during in vitro embryo culture can influence embryo development, cell numbers, and gene expression. Here we propose that the preimplantation bovine embryo possesses a molecular mechanism for the detection of, and response to, oxygen, mediated by a family of basic helix-loophelix transcription factors, the hypoxia-inducible factors (HIFs). Day 5 compacting bovine embryos were cultured under different oxygen tensions (2%, 7%, 20%) and the effect on the expression of oxygen-regulated genes, development, and cell number allocation and HIFa protein localization were examined. Bovine in vitro-produced embryos responded to variations in oxygen concentration by altering gene expression. GLUT1 expression was higher following 2% oxygen culture compared with 7% and 20% cultured blastocysts. HIF mRNA expression (HIF1a, HIF2a) was unaltered by oxygen concentration. HIF2a protein was predominantly localized to the nucleus of blastocysts. In contrast, HIF1a protein was undetectable at any oxygen concentration or in the presence of the HIF protein stabilizer desferrioxamine (DFO), despite being detectable in cumulus cells following normal maturation conditions, acute anoxic culture, or in the presence of DFO. Oxygen concentration also significantly altered inner cell mass cell proportions at the blastocyst stage. These results suggest that oxygen can influence gene expression in the bovine embryo during postcompaction development and that these effects may be mediated by HIF2a. |
Keywords: | Developmental biology early development embryo environment gene regulation |
Rights: | Copyright © 2004 by the Society for the Study of Reproduction. |
DOI: | 10.1095/biolreprod.104.028639 |
Published version: | http://www.biolreprod.org/cgi/content/abstract/71/4/1108 |
Appears in Collections: | Agriculture, Food and Wine publications Aurora harvest Obstetrics and Gynaecology publications |
Files in This Item:
There are no files associated with this item.
Items in DSpace are protected by copyright, with all rights reserved, unless otherwise indicated.