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JOURNAL ARTICLE
RESEARCH SUPPORT, NON-U.S. GOV'T
Generation of cloned calves and transgenic chimeric embryos from bovine embryonic stem-like cells.
Biochemical and Biophysical Research Communications 2003 September 13
Bovine embryonic stem-like cells (ES-like cells) appear to maintain a normal diploid karyotype indefinitely during culture in vitro and to express marker proteins that are characteristic of ES cells from mice, namely, alkaline phosphatase (AP), stage-specific embryonic antigen-1 (SSEA-1), STAT-3, and Oct 4. After proliferation of undifferentiated ES-like cells in vitro, some bovine ES-like cells differentiated to neural precursor cells, which were cultured in the presence of basic fibroblast growth factor (bFGF), epidermal growth factor (EGF), and platelet-derived growth factor (PDGF). In addition, calves were successfully cloned using ES-like cells and the frequency of term pregnancies for blastocysts derived from ES-like cells was higher than those of early pregnancies and maintained pregnancies after nuclear transplantation (NT) with bovine somatic cells. Successful cloning from bovine ES-like cells should allow the introduction into cattle of specific genetic characteristics of biomedical and/or agricultural importance.
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