The lay press recently has reported on two stories that both relate to “designing babies,” although only one of these reports is about producing “designer babies.” The two new technologies, neither yet utilized in a human population, raise different ethical questions. I, for one, am more troubled by the prospect of a designer baby than I am by the possibility of designing or creating an embryo free of its mother’s mitochondrial disease.
National Public Radio (NPR) reported on the advances in treating mitochondrial disease with its story that embryologists are now capable of creating an embryo with maternal DNA but with another woman’s mitochondria, thus allowing women with serious mitochondrial diseases to have healthy offspring.1 The ethical issues are twofold.
This would be the first time we would change the genetics of an embryo, and this change could be passed on to its offspring as well (but only to female offspring because mitochondria are passed along the maternal line by way of the mitochondria in the ovum). Some ethicists have argued that manipulating the genetics of the human genome in a transmissible way is a “bright line” that should not be crossed because if the procedure created any new genetic mistakes, these, too, would be heritable.
The second ethical issue is that the child could be understood as having the DNA of three parents because he or she would have the mitochondrial DNA of the ovum donor while having the nuclear DNA of his or her parents. As NPR describes, Ronald Green, a bioethicist at Dartmouth College, expressed concerns that the offspring could have identity issues because they are the genetically related to three parents, not two.
The first issue of permanently “fixing” genetic diseases is one that I imagine causes little ethical worry among clinicians. Having seen patients suffer with cystic fibrosis, sickle cell disease, and other painful, life-shortening ailments, we would like to see these diseases eradicated by some means other than eliminating all the fetuses afflicted with these genetic errors. If we could allow couples to create healthy fetuses who would, in turn, be able to have healthy children, we would not be creating Frankensteins so much as we are curing a disease by attacking it at its root cause.
The fear of untoward effects is real, but this is not a new ethical problem or realm for medicine. Like any other treatment, there are potential harms, and we need to be vigilant about identifying possible harms, toxicity, or side effects. We already cause secondary cancers by treating cancer, yet no one suggests that the genetic errors induced by chemotherapy have crossed a bright line.
Furthermore, we don’t think, for good reason, of our mitochondrial DNA as being part of “who we are” in the same sense as our nuclear DNA. Having the genetics of a third parent only in our mitochondria is too abstract a concern to cause serious issues for the children that could now be born healthy if this technology was used. While mitochondria are crucial to our health, our personal characteristics are not determined by these little power-generating organelles.
1. Stein R. Proposed treatment to fix genetic diseases raises ethical issues. October, 9, 2013. Available here. Accessed October 19, 2013.
2. Cook M. 23andMe denies that it is marketing tool for “designer babies.” October 12, 2013. Available here. Accessed October 19, 2013.
3. Sandel MJ. The case against perfection: what’s wrong with designer children, bionic athletes, and genetic engineering. The Atlantic Monthly. April 2004. Available here. Accessed. October 19, 2013.