Human leukocyte antigens (HLA) are proteins inherited from our parents that allow the immune system to detect, recognize and respond to infection. An essential feature of this function is that
the immune system must appropriately discriminate between self (harmless) and nonself
(potentially harmful) antigens. Thousands of these proteins are present in humans, with each
individual having their own unique HLA. In organ transplantation, determining recipients’ HLA
is a crucial step in finding the best organ donor because matching recipients with donors having
similar HLA will increase the success of the transplant. However, due to each individual’s
unique HLA, it can be difficult to find compatible donors for recipients. For example, within the general population, kidney transplant candidates have a 1 in 10,000 chance of finding a donor
with HLA typing similar to theirs.