Eight babies in the UK born with DNA from three people to eliminate an incurable inherited disease
In a groundbreaking medical breakthrough, eight babies in the UK have been born bearing the DNA of three different individuals, thanks to an innovative procedure designed to eradicate an incurable hereditary disease.
This marks a significant advancement in the “mitochondrial DNA donation” technique, which is designed to prevent severe and often fatal diseases caused by genetic mutations in the cells’ energy-producing structures.
The application of this technique also serves as a litmus test for the UK’s approach to human embryo research, which is transparent yet strictly regulated. It has allowed for the promotion of a method once controversially dubbed as creating “three-parent babies”.
The healthy infants, four girls and four boys (including a pair of identical twins), were born over the past five years, according to a paper published in the New England Journal of Medicine. “It’s a tremendous success for these families,” said Sir Doug Turnbull, a pioneer of the treatment and professor emeritus at the University of Newcastle. “This is a devastating disease with no cure; without this method, families would not have the chance to be free from mitochondrial disease. Now they have that opportunity.”
Mitochondrial disease affects approximately one in 5,000 newborns in the UK. The severity and type of disease can vary, depending on the number and type of mutations in the mitochondria, and can manifest as neurological, metabolic, or developmental disorders.
The procedure is only available to women at high risk of transmitting serious disease and is exclusively performed at a specialist unit at Newcastle upon Tyne Hospitals NHS Foundation Trust. The identities of the seven families involved have not been disclosed. The mother of one of the boys, who wished to remain anonymous, expressed, “The emotional burden of mitochondrial disease has been lifted. In its place, hope, joy, and deep gratitude have emerged.”
How does the technique work?
The procedure involves extracting genetic material from the embryonic cells of a carrier mother, which is then inserted into a healthy donor embryo after the donor’s own genetic material has been removed. This process eliminates the thousands of diseased mitochondria, while the new embryo benefits from the donor’s healthy mitochondria.
While the mitochondria do carry a small segment of separate genetic code, meaning that the children bear DNA from three different individuals, this constitutes just 0.02 percent of the total DNA and does not influence inherited traits. This is why scientists contest the term “three-parent babies”.
However, the method is not foolproof. Of the 22 women who underwent the procedure, seven successfully became pregnant and gave birth to eight children, resulting in a success rate of 36%.
Five out of the eight children were born completely free of the disease, while the other three showed minor traces of mutated mitochondria as a result of the procedure.
Though these levels are insufficient to trigger the disease, the children will be under careful observation to ensure their normal development. “We’ve designed a special study for this very purpose,” stated Professor Bobby McFarland, who leads the service based in Newcastle. “This sets us apart, as no other country employs this method with such stringent regulatory oversight.”
Beyond the encouraging signs of normal growth, this technique is pushing the boundaries in the medical field. Given that mitochondria transmit their own genetic code, girls born using this method will pass on the donor’s healthy mitochondria to their future offspring. This alteration in the “line of descent” has sparked ethical debates. However, for the seven families involved, and those that may follow, the procedure holds out the promise of a cure for a disease that has haunted their lineage for generations.
Information sourced from Sky News.
