[Q]Cloning Yields Human-Rabbit Hybrid Embryo
By Rick Weiss
Washington Post Staff Writer
Thursday, August 14, 2003; Page A04
Scientists in China have, for the first time, used cloning techniques to create hybrid embryos that contain a mix of DNA from both humans and rabbits, according to a report in a scientific journal that has reignited the smoldering ethics debate over cloning research.
More than 100 of the hybrids, made by fusing human skin cells with rabbit eggs, were allowed to develop in laboratory dishes for several days before the scientists destroyed them to retrieve so-called embryonic stem cells from their interiors. Although scientists in Massachusetts had previously mixed human cells and cow eggs in a similar attempt to make hybrid embryos as a source of stem cells, those experiments were not successful.
Researchers said yesterday they were hopeful that the rabbit work would lead to a new and plentiful source of embryonic stem cells for research and, eventually, for medical use. But theologians and others decried the work as unethical.
Some wondered aloud what, exactly, such a creature would be if it were transferred to a womb to develop to term.
The vast majority of the DNA in the embryos is human, with a small percentage of genetic material -- called mitochondrial DNA -- contributed by the rabbit egg. No one knows if such an embryo could develop into a viable fetus, though some experiments with other species suggest it would not. [/Q]http://www.washingtonpost.com/ac2/wp-dyn/A55911-2003Aug13?language=printer
Thoughts anyone?
By Rick Weiss
Washington Post Staff Writer
Thursday, August 14, 2003; Page A04
Scientists in China have, for the first time, used cloning techniques to create hybrid embryos that contain a mix of DNA from both humans and rabbits, according to a report in a scientific journal that has reignited the smoldering ethics debate over cloning research.
More than 100 of the hybrids, made by fusing human skin cells with rabbit eggs, were allowed to develop in laboratory dishes for several days before the scientists destroyed them to retrieve so-called embryonic stem cells from their interiors. Although scientists in Massachusetts had previously mixed human cells and cow eggs in a similar attempt to make hybrid embryos as a source of stem cells, those experiments were not successful.
Researchers said yesterday they were hopeful that the rabbit work would lead to a new and plentiful source of embryonic stem cells for research and, eventually, for medical use. But theologians and others decried the work as unethical.
Some wondered aloud what, exactly, such a creature would be if it were transferred to a womb to develop to term.
The vast majority of the DNA in the embryos is human, with a small percentage of genetic material -- called mitochondrial DNA -- contributed by the rabbit egg. No one knows if such an embryo could develop into a viable fetus, though some experiments with other species suggest it would not. [/Q]http://www.washingtonpost.com/ac2/wp-dyn/A55911-2003Aug13?language=printer
Thoughts anyone?
