In February 2015, the British Parliament approved the creation of a human embryo from the DNA of three people: mother, father and a donor mother. The modified in-vitro fertilization (IVF) technique, called mitochondrial replacement therapy (MRT), would help some mothers with known rare mitochondrial mutations avoid passing on unhealthy defects. These defects can cause severe or deadly diseases, which are often incurable, such as muscular dystrophy, heart and kidney disease, liver failure and severe muscle weakness. Approximately 99.9 percent of our DNA comes from our mother and father. The donor mother would provide the additional 0.1 percent of DNA, specifically the healthy mitochondrial DNA, for the embryo before or after fertilization.
Mitochondria, also called the “powerhouse of the cell,” convert food into usable energy. They are passed down only by the mother and have their own DNA, but they do not affect a person’s character traits or personal appearance. All of our physical features and personalities come from nuclear DNA passed down from our parents.
Skeptics of MRT are concerned about safety and ethical considerations. Is even minimal genetic engineering a slippery slope that borders on scientists and parents “playing God”? Are we inching toward human eugenics or “designer babies” programs? In a Wall Street Journal opinion piece, bioethicist and psychiatrist, Robert Klitzman wrote, “I would argue that it’s not, that this is equivalent to changing the batteries in some fancy machine. The machine is the same. Sort of like getting a blood transfusion or an organ transplant, it doesn’t change the identity of the person.” However, these are valid concerns, especially if governments do not monitor how far someone will go to manipulate the human makeup.
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