Mammalian nuclear transfer

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<jats:title>Abstract</jats:title><jats:p>During development, the genetic content of each cell remains, with a few exceptions, identical to that of the zygote. Differentiated cells, therefore, retain all the genetic information necessary to generate an entire organism (nuclear totipotency). Nuclear transfer (NT) was initially developed to test experimentally this concept by cloning animals from differentiated cells. It has, since then, been used to study the role of genetic and epigenetic alterations during development and disease. In this review, we highlight some of the milestones in mammalian NT reached in the 50 years after the first nuclear transplantations in frogs. We also address problems associated with mammalian nuclear transfer and provide a survey on current NT and stem cell technology. In the long term, nuclear transfer or alternative strategies aim to generate customized pluripotent cells, which would be invaluable to medical research and therapy. Developmental Dynamics 235:2460–2469, 2006. © 2006 Wiley‐Liss, Inc.</jats:p>

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