Three-parent embryo formed in lab

Scientists have discovered a way to cure mitochondrial diseases in embryos; this method combines the DNA from three humans. The nucleus of an embryo, with the DNA of the mother and father, is removed and implanted in a donor egg. Most of the DNA from the donor egg is removed prior to implantation of the nucleus, except for the part that controls production of the mitochondria. This mitochondria transplant is believed to someday be an effective way to avoid passing down diseases to children. Some problems with this treatment are large abnormalities in the embryos and problems with ethics issues. Carrying out a treatment such as this is comparable to designing a baby how the parents want it. Decisions like this should not even be able to be made; they are a natural part of life that humans should not be able to choose themselves.

http://news.bbc.co.uk/2/hi/health/7227861.stm