Effect of zona pellucida removal on early development of in vitro produced bovine embryos

During early embryo development the zona pellucida acts as a barrier against polyspermia and guarantees communication between blastomeres before and during compaction. However, the development of new technologies of embryo production such as "Handmade Cloning" demands removal of this membr...

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Autores principales:	Velásquez,AE, Manríquez,JR, Castro,FO, Rodríguez-Alvarez,Ll
Lenguaje:	English
Publicado:	Facultad de Ciencias Veterinarias, Universidad Austral de Chile 2013
Materias:	parthenogenesis zona-free well of the well gene expression
Acceso en línea:	http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0301-732X2013000100003
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spelling	oai:scielo:S0301-732X20130001000032013-05-24Effect of zona pellucida removal on early development of in vitro produced bovine embryosVelásquez,AEManríquez,JRCastro,FORodríguez-Alvarez,Ll parthenogenesis zona-free well of the well gene expression During early embryo development the zona pellucida acts as a barrier against polyspermia and guarantees communication between blastomeres before and during compaction. However, the development of new technologies of embryo production such as "Handmade Cloning" demands removal of this membrane. The aim of this study was to determine the effect of zona pellucida removal on in vitro bovine embryo development. First, the consequences of zona pellucida removal was assessed by comparing the percentage of first cleavage, percentage of blastocysts and cell number among zona-included and zona-free embryos; either through the removal of the zona pellucida immediately after IVF or parthenogenesis. Embryo development was also evaluated when zona pellucida was removed before parthenogenesis. In a second set of experiments, the gene expression levels of BAX, BCL2, CASP3, CDH1, OCT4 and SOX2 were evaluated in zona-free and zona-included IVF-derived embryos. No significant differences were found in the percentage of first cleavage, percentage of blastocyst and cell number on IVF-embryos cultured with or without zona. Parthenogenetic embryos followed the same general pattern even when the zona pellucida was eliminated before activation; however there was a significant increase in the rate of first cleavage when the zona pellucida was removed after activation but this did not impact upon further development. Furthermore, no significant differences in gene expression level were found between zona-free and zona-included IVF-embryos for the studied genes. We concluded that the lack of zona pellucida did not affect the early development when an appropriate system is used for embryo culture to ensure blastomeric contact and normal compaction.info:eu-repo/semantics/openAccessFacultad de Ciencias Veterinarias, Universidad Austral de ChileArchivos de medicina veterinaria v.45 n.1 20132013-01-01text/htmlhttp://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0301-732X2013000100003en10.4067/S0301-732X2013000100003
institution	Scielo Chile
collection	Scielo Chile
language	English
topic	parthenogenesis zona-free well of the well gene expression
spellingShingle	parthenogenesis zona-free well of the well gene expression Velásquez,AE Manríquez,JR Castro,FO Rodríguez-Alvarez,Ll Effect of zona pellucida removal on early development of in vitro produced bovine embryos
description	During early embryo development the zona pellucida acts as a barrier against polyspermia and guarantees communication between blastomeres before and during compaction. However, the development of new technologies of embryo production such as "Handmade Cloning" demands removal of this membrane. The aim of this study was to determine the effect of zona pellucida removal on in vitro bovine embryo development. First, the consequences of zona pellucida removal was assessed by comparing the percentage of first cleavage, percentage of blastocysts and cell number among zona-included and zona-free embryos; either through the removal of the zona pellucida immediately after IVF or parthenogenesis. Embryo development was also evaluated when zona pellucida was removed before parthenogenesis. In a second set of experiments, the gene expression levels of BAX, BCL2, CASP3, CDH1, OCT4 and SOX2 were evaluated in zona-free and zona-included IVF-derived embryos. No significant differences were found in the percentage of first cleavage, percentage of blastocyst and cell number on IVF-embryos cultured with or without zona. Parthenogenetic embryos followed the same general pattern even when the zona pellucida was eliminated before activation; however there was a significant increase in the rate of first cleavage when the zona pellucida was removed after activation but this did not impact upon further development. Furthermore, no significant differences in gene expression level were found between zona-free and zona-included IVF-embryos for the studied genes. We concluded that the lack of zona pellucida did not affect the early development when an appropriate system is used for embryo culture to ensure blastomeric contact and normal compaction.
author	Velásquez,AE Manríquez,JR Castro,FO Rodríguez-Alvarez,Ll
author_facet	Velásquez,AE Manríquez,JR Castro,FO Rodríguez-Alvarez,Ll
author_sort	Velásquez,AE
title	Effect of zona pellucida removal on early development of in vitro produced bovine embryos
title_short	Effect of zona pellucida removal on early development of in vitro produced bovine embryos
title_full	Effect of zona pellucida removal on early development of in vitro produced bovine embryos
title_fullStr	Effect of zona pellucida removal on early development of in vitro produced bovine embryos
title_full_unstemmed	Effect of zona pellucida removal on early development of in vitro produced bovine embryos
title_sort	effect of zona pellucida removal on early development of in vitro produced bovine embryos
publisher	Facultad de Ciencias Veterinarias, Universidad Austral de Chile
publishDate	2013
url	http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0301-732X2013000100003
work_keys_str_mv	AT velasquezae effectofzonapellucidaremovalonearlydevelopmentofinvitroproducedbovineembryos AT manriquezjr effectofzonapellucidaremovalonearlydevelopmentofinvitroproducedbovineembryos AT castrofo effectofzonapellucidaremovalonearlydevelopmentofinvitroproducedbovineembryos AT rodriguezalvarezll effectofzonapellucidaremovalonearlydevelopmentofinvitroproducedbovineembryos
_version_	1718437914217545728

Effect of zona pellucida removal on early development of in vitro produced bovine embryos

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