Document Detail

Comparison of early development in utero of cloned fetuses derived from bovine fetal fibroblasts at the G1 and G0/G1 phases.
MedLine Citation:
PMID:  20189326     Owner:  NLM     Status:  MEDLINE    
In bovine somatic cell nuclear transfer (NT), embryos are more likely to develop to full term when they are derived from fibroblasts at the G1 phase instead of cells at the G0/G1 phase. To better understand the reason for this difference, we examined morphological development in the early pregnancy of NT embryos using G1 phase cells (G1-NT embryos) and G0/G1 phase cells (G0/G1-NT embryos). Blastocysts derived from G1 and G0/G1-NT embryos were transferred to recipient heifers, and the conceptuses at day 50 of gestation were retrieved non-surgically using prostaglandin F(2alpha) and oxytocin. In vitro-fertilized (IVF), parthenogenetic and artificially inseminated (AI) embryos were used as controls. The percentages of embryos that developed to the blastocyst stage did not differ between G1 and G0/G1-NT embryos. Pregnancy rates at day 30 of recipient heifers carrying G1-NT, G0/G1-NT, IVF, parthenogenetic and AI embryos were similar (57-100%). Two recipient heifers carrying parthenogenetic embryos returned to estrus between days 30 and 50 of gestation, whereas all other pregnancies remained viable. Most fetuses at day 50 of gestation of all experimental groups (83%) were recovered non-surgically by several PGF(2alpha) and oxytocin treatments. Recovery rates of normal fetuses derived from G1-NT embryos (83%), IVF embryos (80%) and AI embryos (88%) were greater than those of G0/G1-NT embryos (33%) and parthenogenetic embryos (0%). Our results suggest that NT embryos reconstructed with cells at the G1 phase have a high developmental competence from the time of embryo transfer to day 50 of gestation.
Atsushi Ideta; Koh Hayama; Manami Urakawa; Kanami Tsuchiya; Yoshito Aoyagi; Kazuhiro Saeki
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Publication Detail:
Type:  Comparative Study; Journal Article; Research Support, Non-U.S. Gov't     Date:  2010-02-11
Journal Detail:
Title:  Animal reproduction science     Volume:  119     ISSN:  1873-2232     ISO Abbreviation:  Anim. Reprod. Sci.     Publication Date:  2010 Jun 
Date Detail:
Created Date:  2010-03-29     Completed Date:  2010-06-24     Revised Date:  -    
Medline Journal Info:
Nlm Unique ID:  7807205     Medline TA:  Anim Reprod Sci     Country:  Netherlands    
Other Details:
Languages:  eng     Pagination:  191-7     Citation Subset:  IM    
Copyright Information:
Copyright (c) 2010 Elsevier B.V. All rights reserved.
Zen-noh Embryo Transfer Center, Kamiotofuke, Kamishihoro, Katogun, Hokkaido, Japan.
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MeSH Terms
Blastocyst / physiology
Cattle / embryology*
Cloning, Organism / methods,  veterinary*
Embryo Culture Techniques / veterinary
Embryonic Development*
Fertilization in Vitro / veterinary
Fibroblasts / ultrastructure*
G0 Phase*
G1 Phase*
Gestational Age
Insemination, Artificial / veterinary
Nuclear Transfer Techniques

From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine

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