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Therapeutic cloning no longer a dream, says scientist who produced first cloned embryonic stem cell

Berlin, Germany: A member of the team who were the first in the world to produce stem cells from a cloned human embryo told the 20th annual conference of the European Society for Human Reproduction and Embryology today (30 June) that the work could generate potentially unlimited undifferentiated stem cells. These could eventually be used for tissue repair and transplantation medicine, said Professor Shin-Yong Moon at a media briefing.

Professor Moon and his colleagues at Seoul National University, South Korea, took 242 eggs from 16 healthy donors. Using the cloning technique somatic cell nuclear transfer (SNCT), the researchers removed the nucleus of each unfertilised egg and replacing it with the nucleus taken from a cell from the cumulus the clump of cells that surrounds the egg - of the donor. The eggs were then stimulated to begin dividing and after a few days 30 blastocysts were produced. From these the researchers were able to extract one colony of stem cells.

Although the procedure is highly experimental and still needs refinement, its publication was greeted with great enthusiasm because of its potential to produce stem cells which are genetically identical to the donor. In principle stem cells can be directed to develop into any tissue.

"This means that patients who received them as part of a treatment would not reject the cells as foreign", said Professor Moon. "We call this therapeutic cloning to differentiate it from reproductive cloning, where the aim would be to implant the cloned embryo into a woman in order to produce a baby. In therapeutic cloning, the embryo is destroyed after the stem cells have been harvested."

Scientists believe that therapeutic cloning holds great promise for the treatment of a large number of currently untreatable conditions, including many inherited diseases.

"Our first attempt was clearly not very efficient",
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Contact: Mary Rice
mary.rice@blueprintpartners.be
European Society for Human Reproduction and Embryology
30-Jun-2004


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