Embryo stem cells made from skin
US researchers have reported a breakthrough in stem cell research, describing how they have turned human skin cells into embyronic stem cells for the first time.
The method described on Wednesday by Oregon State University scientists in the journal Cell, would not likely be able to create human clones, said Shoukhrat Mitalipov, senior scientist at the Oregon National Primate Research Centre.
But, it is an important step in research because it does not require the use of embryos in creating the type of stem cell capable of transforming into any other type of cell in the body. The technique involves transplanting an individual’s DNA into an egg cell that has been stripped of genetic material, a variation of a method called somatic cell nuclear transfer. “A thorough examination of the stem cells derived through this technique demonstrated their ability to convert just like normal embryonic stem cells, into several different cell types, including nerve cells, liver cells and heart cells,” said Mr Mitalipov. He added that since the reprogrammed cells use genetic material from the patient, there is no concern about transplant rejection.
“While there is much work to be done in developing safe and effective stem cell treatments, we believe this is a significant step forward in developing the cells that could be used in regenerative medicine,” Mr Mitalipov said. Another advantage of this approach is that it does not use fertilised embryos to obtain stem cells, a technique that raises major ethical issues because the embryo is destroyed.
Since the birth of the sheep Dolly in 1996 in UK, the first cloned animal, researchers have cloned some 20 species including goats and rabbits, but never monkeys or primates whose biologies and reproduction is more complex. Since the human cells used appeared even more fragile, researchers said it was unlikely that clones could be made. “While nuclear transfer breakthroughs often lead to a public discussion about the ethics of human cloning, this is not our focus, nor do we believe our findings might be used by others to advance the possibility of human reproductive clon-ing,” they said.
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