Efficient production of transgenic cloned calves using preimplantation screening

Shu Hung Chen, Todd D. Vaught, Jeff A. Monahan, Jeremy Boone, Elizabeth Emslie, Peter M. Jobst, Ashley E. Lamborn, Angelika Schnieke, Laura Robertson, Alan Colman, Yifan Dai, Irina A. Polejaeva, David L. Ayares

Research output: Contribution to journalArticlepeer-review

35 Scopus citations

Abstract

The genetic manipulation of donor cells before nuclear transfer (NT) enables prior selection for transgene integration. However, selection for genetically modified cells using antibiotic drugs often results in mixed populations, resulting in a mixture of transgenic and nontransgenic donor cells for NT. In this study, we attempted to develop efficient strategies for the generation of human bile salt-stimulated lipase (BSSL) transgenic cows. Pre-implantation screening by either biopsy or green fluorescent protein (GFP) expression was used to detect NT-derived BSSL transgenic embryos to ensure that the calf born would be transgenic. We compared the development rates of NT-derived embryos from G418- and GFP-selected donor cells. There were no significant differences (P < 0.001) in cleavage rate (67.2% vs. 60.0%) and blastocyst formation rate (44.9% vs. 41.2%). We also compared the pregnancy rates of the G418/biopsy and GFP preimplantation screened NT-derived blastocysts. The Day 40 pregnancy rate of the G418/biopsy group (40%) was lower than that of the GFP group (57%), but the calf birth rate of the G418/ biopsy group (40%) was higher than that of the GFP group (21%). Healthy BSSL transgenic calves were born after both screening processes. This is the first report of biopsy-screened cloned transgenic animals. The results suggest that both selection methods are useful for detecting transgenic NT embryos without negatively affecting their development into viable transgenic offspring.

Original languageEnglish
Pages (from-to)1488-1492
Number of pages5
JournalBiology of Reproduction
Volume67
Issue number5
DOIs
StatePublished - 1 Nov 2002
Externally publishedYes

Keywords

  • Assisted reproductive technology
  • Early development
  • Embryo
  • Pregnancy

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