Clonal Propagation of Primate Offspring by Embryo Splitting

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Science  14 Jan 2000:
Vol. 287, Issue 5451, pp. 317-319
DOI: 10.1126/science.287.5451.317

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Primates that are identical in both nuclear and cytoplasmic components have not been produced by current cloning strategies, yet such identicals represent the ideal model for investigations of human diseases. Here, genetically identical nonhuman embryos were produced as twin and larger sets by separation and reaggregation of blastomeres of cleavage-stage embryos. A total of 368 multiples were created by the splitting of 107 rhesus embryos with four pregnancies established after 13 embryo transfers (31% versus 53% in vitro fertilization controls). The birth of Tetra, a healthy female cloned from a quarter of an embryo, proves that this approach can result in live offspring.

  • * Present address: Interdisciplinary Center for Clinical Research, Westphalian Wilhelms-University, D 48149 Münster, Germany.

  • To whom correspondence should be addressed. E-mail: schatten{at}

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