After 50 long years, baffled scientists have discovered a new blood group system called the MAL blood group. Basically, blood group systems are ways to categorize blood based on tiny markers on red blood cells. These markers let the body’s immune system know whether the blood cells are part of your body or if they come somewhere else (blood transfusion).
However, what makes this discovery amazing is the fact that this discovery had finally solved the long time mystery that the ancients had been trying to figure out for 50 years. Now, there’s this specific marker on red blood cells called the ANWJ antigen, but nobody really understood how these cells worked or why they appeared in people’s blood and not in others. But thanks to the MAL blood group discovery, scientists have figured it out.
Background on Blood Groups and Antigens
Blood groups are categories that classify blood based on tiny markers, as mentioned earlier, called antigens. These antigens are found on the surface of red blood cells. Just like humans need an identification card, the same goes for blood cells. So these antigens are what act as identification tags for the blood cells, telling your immune system whether the blood cells belong to your body or if they’re from someone else. If the antigens don’t match, your immune system can see them as a threat and strike an attack, which of course, can be dangerous.
The most common blood group systems though, are the ABO system and the RH system. The ABO system divides blood into four main types: A, B, AB, and O, which depends on which antigens are present. The RH system adds another label; positive or negative; which is based on whether the RHD antigen is present.
Example: Someone’s blood type could be A+ (A-positive) or O-(O-negative).
Back in 1972, scientists discovered a rare antigen called ANWJ in red blood cells. However, they couldn’t figure out what caused it or where it even came from, which left them puzzled for decades. What’s even more fascinating is that some people don’t have this antigen at all, which makes them ANWJ -negative.
Because of how rare it is, and the fact that we know we have an explanation for its genetic origin, the ANWJ antigen has become a long-standing mystery in science and hematology.
The MAL Blood Group
The MAL protein is responsible for creating the mysterious ANWJ antigen. If a person has the full-length MAL protein on their red blood cells, they are considered AnWj-positive, meaning the antigen is present. On the other hand, if someone doesn’t have the full-length MAL protein, they are AnWj-negative, meaning the antigen is missing. This is pretty much the difference that scientists use to group people into the MAL blood group system.
The name “MAL” comes directly from this newly identified protein, which makes it easier to remember and connects it to its discovery. The MAL blood group system is now officially recognized as the 47th blood group system by the International Society of Blood Transfusion (ISBT), a global organization that oversees how the blood is classified and used.
Finally: Why is This Discovery Important?
Firstly, it can improve patient care. If someone with AnWj-negative blood needs a transfusion, it can be hard to find a compatible donor because the blood type is rare. Now that scientists understand how the MAL protein relates to AnWj-negative blood, doctors can provide more care for these patients.
Not only that, it makes it easier to identify compatible donors. For someone with AnWj-negative blood, receiving blood from a donor with the wrong type can cause problems. But now, doctors can better match donors and recipients to make transfusions safer.
