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Study Reports Successful Cloning of Human Embryo Using Adult DNA
Date:1/17/2008

Key Step Toward Developing Embryonic Stem Cell Lines for Therapeutic

Cloning

DURHAM, N.C., Jan. 17 /PRNewswire/ -- A California research team has become the first to report, and painstakingly document, the cloning of a human embryo using donated oocytes (egg cells) and DNA from the cells of an adult donor. The study was published online today by the journal "Stem Cells."

(Logo: http://www.newscom.com/cgi-bin/prnh/20080117/CLTH022LOGO )

The experiments, using a technique called somatic cell nuclear transfer (SCNT), provide key steps toward the development of patient-specific embryonic stem cells for use in developing new treatments for conditions such as Alzheimer's disease, Parkinson's disease, and spinal cord injury, among others. The lead author was Andrew J. French, Ph.D., of Stemagen Corp., a private company headquartered in La Jolla, Calif.

In the experiments, the researchers removed the nuclei of mature oocytes from healthy young women who had previously donated eggs for successful infertility treatments. The SCNT technique was then used to insert DNA from an adult male donor into the oocytes. The DNA was derived from a type of cell called fibroblasts, obtained from skin biopsies.

Subsequently, several of the reconstructed oocytes continued to develop as normal embryos, to the blastocyst stage. Extensive and carefully documented genetic tests were performed to confirm the genetic identity of the cloned embryos. In three embryos, tests showed the same DNA as the male fibroblast donor.

In one of the three cases, additional tests showed that the embryo had another type of DNA, called mitochondrial DNA, from both the female oocyte donor and the male DNA donor.

Mitochondrial DNA testing is viewed as an essential proof of successful human cloning -- particularly after previous fabricated repo
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SOURCE AlphaMed Press
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