Beta-thalassemia is a blood disorder that plagues individuals throughout the entirety of their lives. There is no truly viable cure. The only real hope that people have of overcoming this disease is either a stem cell or bone marrow transplant; however, these procedures are rarely performed due to the life-threatening risk that comes with them.
As such, people who suffer from beta-thalassemia will need to have lifelong blood transfusions and specialist care – and the disease is genetic. Children who contract it from their parents may develop life-threatening anemia, blood clots, misshapen bones, jaundice …the list goes on and on.
But there is new hope: Genetic engineering.
In a world-first, a team of researchers hailing from Sun Yat-sen University have used gene editing to correct the error in DNA that causes this condition—and they did it in actual human embryos.
Specifically, the team used something known as “base editing” – which is also known as “chemical surgery” – to alter the fundamental building blocks of DNA, ultimately correcting a single error out of the staggering three billion “letters” that make up our genetic code by converting one DNA base into another. The success of this procedure hinges on the fact that this life-threatening blood disorder stems from a change to just a single base in a person’s genetic code, which is known as a point mutation.
The Sun Yat-sen team were able to successfully edit this single change and correct it. Notably, the work was done on lab-made embryos that were not implanted; however, the promise of this work cannot be overstated.
This most recent work was published in the journal Protein and Cell. Although we are still some way off from clinical trials, the work represents the first steps towards a future in which we are able to literally edit disease out of viable human embryos and, perhaps, even our own bodies.
This remarkably powerful tool has much potential, but it needs to be carefully considered.