Three -person IVF technique exiled children from hereditary diseases, say scientists

Eight children in the United Kingdom have been saved by devastating genetic diseases thanks to a new three -person fertilization technique (IVF), scientists from the University of Newcastle said on Wednesday.

The technique, which is prohibited in the United States, carries pieces from the mother’s fertilized egg – its core, as well as the core of the father’s sperm – to a healthy egg provided by an anonymous donor.

The process prevents the transfer of mutated genes from the mother’s mitochondria – cell energy factories – which could cause incurable and potentially deadly disorders.

Mutations in the mitochondrial DNA can affect the multiple organs, especially those that require high energy, such as the brain, the liver, the heart, the muscles and the kidneys.

One of the eight children is now two years old, two are between one and two ages, and five are infants. They were all healthy at birth, with blood tests showing no or low levels of mitochondrial gene mutations, scientists reported to The New England Medicine newspaper. Everyone has made normal development progress, they said.

The results “are the culmination of decades of work”, not only for scientific/technical challenges, but also for the moral research, public and involvement of patients, the creation of laws, the drafting and execution of regulations and the establishment of a monitoring and care system for mothers and infants.

The researchers’ “data treasure” is likely to be the starting point of new research routes, Greenfield said.

Often during IVF control procedures, doctors can detect some low -risk eggs with very few mitochonder gene mutations suitable for implantation.

But sometimes all the mitochondrial DNA of the eggs carries mutations. In these cases, using the new technique, the UK doctors first fertilize the mother’s egg with the father’s sperm. They then remove the “pronuclei” of the fertilized egg – that is, the cores of the egg and sperm, which carry the DNA instructions from both parents for the development, survival and reproduction of the baby.

They then transport the cores of egg and sperm to a donated fertilized egg that has been removed by its pronuclei.

The donor’s egg will now begin to separate and grow with healthy mitochondria and nuclear DNA from the mother’s egg and father’s sperm.

This procedure, described in detail in a second document in the magazine, “essentially replaces the defective mitochondrial DNA (MTDNA) with healthy MTDNA by the donor,” said senior researcher Mary Herbert, Professor of Reproductive Biology in Newcastle.

Blood mutation levels were 95% to 100% lower in six newborns and 77% to 88% lower in two others, compared to levels of the same variants in their mothers, the researchers reported in a second job.

“These data indicate that the prospect of transport was effective in reducing the transmission of MTDNA disease,” they said.

The process was tested in 22 women whose babies were likely to inherit such genes. In addition to the eight women who handed over the children described in this report, another of 22 is pregnant today.

Seven of eight pregnancies were smooth. In one case, a pregnant woman had blood tests showing high levels of lipids.

There were no miscarriages.

Authors of the current report have also tried the transplantation of the core of the mother’s non -fertilized egg into a donor egg and then fertilizing the donor egg afterwards, but believe that their new approach can more reliably prevent the transmission of genetic disorders.

In 2015, the United Kingdom became the first country in the world to legalize research on the treatment of mitochondrial donations in humans.

In the same year in the United States, the prospect of transport was effectively banned for human use by a Congress Credit bill, which banned the Food and Drug Administration from using funds to examine the use of “inherited genetic modification”.