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Biochem Biophys Res Commun. 2004 Jan 23;313(4):1030-6.

Impact of embryonic expression of enhanced green fluorescent protein on early mouse development.

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  • 1Department of Molecular Reproduction, Development and Genetics, Indian Institute of Science, Bangalore 560012, India.


The impact of embryonic enhanced green fluorescent protein (EGFP)-expression on development is not clear. In this study, we comprehensively assessed EGFP-expression pattern and its effect on early mouse development, following pronuclear-microinjection of the EGFP-transgene, containing chicken-beta-actin promoter and cytomegalovirus enhancer. Preimplantation embryos exhibited differential EGFP-expression patterns. While blastocyst development of non-expressing embryos was 77.3+/-1.8%, that of expressing embryos was only 43.9+/-1.6% (P<0.0001). Developmental competence of embryos negatively correlated (r=-0.99) with the levels of EGFP-expression. Faint-, moderate-, and intense-expressing embryos developed to 83.1+/-5.3%, 50+/-5%, and 9.5+/-3.9% blastocysts, respectively (P<0.002). Interestingly, blastocysts expressing faint-moderate levels of EGFP were developmentally competent through the post-implantation period and delivered viable transgenic 'green' mice, following embryo transfer. These results indicate that hyper-expression of EGFP affects preimplantation development and faint-moderate level of its expression is compatible with normal embryogenesis in the mouse.

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