United Kingdom: Are UK’s “Three-Parent Babies” the Future of Genetic Medicine?

KAKALI DAS

You might remember from school biology the famous line: “Mitochondria is the powerhouse of the cell.” It’s a simple sentence, but it tells us something very important about how our bodies work.

Mitochondria are tiny parts inside our cells. They act like batteries, giving cells the energy they need to function. Without healthy mitochondria, cells cannot produce enough energy. This energy shortage can cause serious problems in the body.

Some children are born with diseases caused by damaged mitochondria. These diseases stop their cells from making enough energy. When this happens, organs like the brain, heart, and muscles begin to fail. Sadly, many children with mitochondrial diseases get very sick and some die at a young age.

For a long time, doctors did not know how to save these children or prevent these diseases. But now, there is exciting news from the United Kingdom. Eight healthy babies have been born without mitochondrial diseases, thanks to a new and special medical procedure. This is the first time in the world that such a method has been used successfully.

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What Is Mitochondrial Disease?

Our bodies are made of millions of cells. Each cell has a control center called the nucleus, which contains most of our DNA – the instructions that make us who we are. We get half of our DNA from our mother and half from our father.

But inside each cell, outside the nucleus, there are tiny structures called mitochondria. These mitochondria have their own small set of DNA – 37 genes that are separate from the main DNA in the nucleus.

Mitochondria are very important because they turn food into energy. If the mitochondrial DNA has a mutation (a change or error), the mitochondria cannot work properly. This causes a condition called mitochondrial disease.

Because we inherit mitochondria only from our mother, if the mother’s mitochondria have these mutations, all her children can be affected. The symptoms of mitochondrial disease usually show up early. Children may have seizures, muscle weakness, delayed development, and many need wheelchairs. Some may die soon after birth. About one in every 5,000 babies in the world has mitochondrial disease.

Babies with DNA from Three People

For years, parents affected by this disease have hoped for a cure. Now, scientists in the UK have created a way to stop mitochondrial disease before a child is born.

This new technique is called mitochondrial donation, and it uses a special type of IVF (in vitro fertilization). IVF is when an egg is fertilized by sperm outside the mother’s body in a laboratory.

Normally, the baby gets DNA from the mother and the father. But in this new procedure, doctors use DNA from three people:

The father’s sperm
The mother’s egg (which may have faulty mitochondria)
A donor woman’s egg (which has healthy mitochondria)

Here’s how it works – Doctors take the nucleus from the mother’s egg, which contains her main DNA, and place it into the donor’s egg, which has healthy mitochondria but its nucleus removed. Then the egg is fertilized by the father’s sperm. This means the baby has DNA from three people, most DNA comes from the parents, but the healthy mitochondria come from the donor.

The amount of DNA the baby gets from the donor is very small, about 0.1%. But this small change is enough to protect the child from mitochondrial disease.

Thanks to this technique, the eight babies born in the UK are healthy and free from mitochondrial diseases. Doctors call this a medical miracle.

Why Is This Procedure Controversial?

Even though this new method offers hope to many families, it is not without controversy.

Some people are worried because the babies inherit DNA from three people. They call it “three-parent babies” or “designer babies.” They fear it might change human genetics in ways we don’t fully understand.

Also, because the healthy mitochondria from the donor will be passed down to future generations, some think this changes a family’s genetic heritage forever.

Because of these concerns, many countries, including the US and France, have not yet approved this procedure. Only a few places like the UK have made laws to allow it.

Many scientists and doctors disagree with the critics. They explain that the DNA from the donor’s mitochondria does not affect traits like eye colour, height, or personality. The mitochondria’s DNA only helps with energy production. It does not make a person who they are in terms of appearance or behaviour.

For families who have lost children to mitochondrial diseases, this procedure is life-changing. It gives them hope that their future children can be healthy.

This ground-breaking technique is a big step forward in medicine. It shows how science can help prevent devastating diseases before a child is even born.

It also opens new doors for other genetic diseases that we may one day be able to prevent.

While it is important to think carefully about ethical questions and safety, the chance to save lives and prevent suffering is very powerful.

For thousands of parents worldwide who have faced the heartbreak of losing children to mitochondrial disease, this breakthrough offers a new hope, the hope of a healthy future for their children.

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