alexa Cloning the laboratory mouse.
Genetics & Molecular Biology

Genetics & Molecular Biology

Cloning & Transgenesis

Author(s): Wakayama T, Yanagimachi R

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Abstract A brief account is given of early attempts to clone mammals (mice) by transferring cells (nuclei) of preimplantation embryos into enucleated oocytes, zygotes or blastomeres of two-cell embryos. This is followed by a brief review of recent successes using adult somatic cells: mammary gland cells for sheep, muscle cells for cattle and cumulus cells for mice. We have developed a technique for cloning the laboratory mouse by transferring cumulus cell nuclei into enucleated oocytes. With this technique, we have produced a population of over 80 cloned animals, and have carried the process over four generations. Development and fertility of these appear normal. However, the yield is very low; only approximately 1\% of injected oocytes are carried to term. The challenge is now to understand the reason for this high loss. Is it a problem of technique, genomic reprogramming, somatic mutation, imprinting or incompatible cell cycle phases? Copyright 1999 Academic Press. This article was published in Semin Cell Dev Biol and referenced in Cloning & Transgenesis

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