Nuclear transfer, however, could treat these disorders since it involves an egg that provides its own, healthy mitochondria. But the process requires a good supply of eggs, which have to be donated by healthy volunteers. That raises ethical concerns since the technique could produce human clones. That’s why research on nuclear transfer is not funded by the federal government, and scientists know less about these cells and their potential than they do about iPS cells. “They have become kind of like cursed cells,” says Mitalipov of the stem cells generated through nuclear transfer. “But we clearly need to understand more about them.
If the technology exists, it will be used. That’s pretty much a truism. In the meantime, the advent of significant life extension technology moves ever closer.
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