“Golden Blood”: The Discovery That Could Save Lives

Blood transfusions are one of modern medicine’s greatest achievements, saving millions of lives every year. Yet for people with rare blood types, finding compatible blood can be a life-or-death challenge. The rarest blood type in the world is Rh null, found in only 50 known people globally. Known as “golden blood,” it lacks all 50 Rh antigens, making it compatible with all other Rh types – a true “super donor” in emergencies.

“Rh antigens trigger a strong immune response, and if you have none, your blood is essentially compatible with most others,” explains Professor Ash Toye from the University of Bristol. This makes Rh null extremely valuable but exceedingly rare. Those who have it are encouraged to freeze their own blood for emergencies.

Scientists are now trying to reproduce Rh null in the lab. Using Crispr-Cas9 and stem cells, teams in the UK, US, Canada, and Spain are attempting to create red blood cells compatible with most blood types, including rare Rh null and Bombay types. The process is complex: stem cells must mature correctly, and their membranes must remain intact to function as real blood.

The RESTORE project is the first clinical trial testing lab-grown red blood cells in healthy volunteers. While no gene editing is involved yet, it took 10 years of research to reach this stage. Professor Toye emphasizes that traditional donation remains the most efficient method, but lab-grown blood could be vital for patients with rare blood types.

In the future, laboratories may establish banks of “golden blood,” ready to be deployed in emergencies, reducing risks and saving lives where compatible blood is impossible to find.