mitochondrial disease

Several women who have had trouble conceiving children have gone to a clinic in Ukraine that is doing something unique: using DNA from three different people to create a healthy embryo.

A clinic in Kiev, Ukraine, stirs controversy by making babies with DNA from three different people to help women who are infertile bear children. It's the only clinic known to be doing this right now.

A baby who was conceived through an experimental procedure designed to prevent a deadly disease appears to be healthy. But some potentially defective DNA remains. Will it affect his health long term?

In 2016, scientists combined the genes of three people in an effort to make a baby free of an inherited disease. But the process doesn't wipe out all faulty mitochondria, and could pose new risks.