25 In vitro development of aggregated nuclear transferred embryos derived from bovine cumulus cells.

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dc.contributor Akagi, S
dc.contributor Tsuneishi, B
dc.contributor Watanabe, S
dc.contributor Takahashi, S
dc.date.accessioned 2012-01-30T19:52:40Z
dc.date.available 2012-01-30T19:52:40Z
dc.date.issued 2005
dc.identifier.citation Rep. Fert. Dev. (2005) 17(1&2): 162-162
dc.identifier.issn 1031-3613
dc.identifier.uri http://livestocklibrary.com.au/handle/1234/17340
dc.description.abstract It has been reported that aggregation of two nuclear transfer (NT) mouse embryos shows an improvement in full-term development (Boiani M et al. 2003 EMBO J. 22, 5304?5312). In this study, we examined the effect of aggregation on in vitro development of bovine NT embryos. As donor cells for NT, cumulus cells of passage 3?5 were used following culture in serum-starved medium for 5?7 days. NT was performed as previously described (Akagi S et al. 2003 Mol. Reprod. Dev. 66, 264?272). NT embryos were cultured in a serum-free medium (IVD-101, Research Institute of Functional Peptide Co., Ltd., Shimojo, Yamagat, Japan). Eight-cell-stage embryos on Day 2 or 16- to 32-cell-stage embryos on day 4 were used for embryo aggregation after removal of the zona pellucida. A small depression was made in a 25-?L drop of TCM-199 with 50 ?g/mL phytohemagglutinin (TCM199/PHA) or IVD-101 using a darning needle. Two or three NT embryos were placed into the depression in the drop of TCM199/PHA for 20 min. NT aggregates were then moved into the depression in the drop of IVD-101 and cultured until Day 7. In vitro development of NT aggregates was summarized in <a target="_blank" class="reftools" href="dsp_journal_table2.cfm?T1">Table 1. There were no differences in the cell number and ICM ratio of blastocysts between non-aggregated zona-intact and zona-free embryos. All aggregates of three NT embryos developed to the blastocyst stage and the cell number of these blastocysts was significantly higher than that of non-aggregated NT blastocysts. These results indicate that removal of the zona pellucida does not affect the cell number and ICM ratio of blastocysts and that aggregates of three NT embryos can develop to blastocysts with high cell numbers which are equivalent to in vivo-derived embryos (166 � 11, Knijn HM et al. 2003 Biol. Reprod. 69, 1371?1378).
dc.publisher CSIRO
dc.source.uri http://www.publish.csiro.au/?act=view_file&file_id=RDv17n2Ab25.pdf
dc.title 25 In vitro development of aggregated nuclear transferred embryos derived from bovine cumulus cells.
dc.type Research
dc.description.version Abstract
dc.identifier.volume 17
dc.identifier.page 162-162
dc.identifier.issue 1&2


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