Le mystère O négatif : Enquête sur le secret du donneur universel

Video Content Used (Key Points + Sources) Group O negative red blood cells lack the A, B, and RhD antigens, which is why they are often referred to as the "universal donor" for red blood cell transfusions. (redcrossblood.org) Group O negative is rare (approximately 7% of the population in the United States), and demand is often high. (redcrossblood.org) Group O negative patients can generally only receive red blood cells of the same group. (Blood Institute) In medical emergencies, Group O negative is often used when the blood type is not immediately known; emergency departments may also have Group O positive red blood cells available, depending on protocols and stock levels. (nhs.uk) AB plasma is generally considered a "universal donor" plasma (plasma compatibility is reversed compared to red blood cell compatibility). (Center for Computational Genomics) ABO blood groups were identified in the early 20th century by Karl Landsteiner, enabling safer transfusions. (NobelPrize.org) The Rh blood group system (Rh factor) was discovered in 1940 (Landsteiner and Wiener). (Encyclopædia Britannica) The anticoagulant sodium citrate made indirect (non-direct) transfusions possible in 1914–1915, reducing the need for the donor and recipient to be in the same room. (University of Kansas Medical Center) A significant milestone in blood banking: Cook County Hospital opened one of the first blood banks in 1937 (often cited as the first hospital blood bank in the United States). (Cook County Health) The typical shelf life of red blood cells in a blood bank is approximately 42 days for common erythrocyte products. (American Society of Hematology) The ABO blood group "O" allele usually results from a deletion causing a frameshift and an inactive enzyme, leaving the H antigen unchanged. (NCBI) The selective pressures on the distribution of ABO blood groups are debated; the emergence of the O allele likely predates the major migrations out of Africa (based on the scientific literature). (ASH Publications) RhD-negative blood in many Europeans is frequently associated with the absence or deletion of the RHD gene (the mechanism differs among populations). (The Lancet) The high frequency of RhD-negative blood in the Basques has been studied; Demographic and adaptive hypotheses have been proposed to explain this phenomenon, but causality is not clearly demonstrated. (Nature) HBOC-201 (Hemopure) is approved and used in South Africa and is available in the United States through expanded access or investigational programs, without general FDA approval. (ScienceDirect) and (ClinicalTrials) Perftoran (a perfluorocarbon oxygen carrier) has received historical approvals (notably in Russia and, historically, in Mexico) and is the subject of recent publications, with research continuing. (Springer Link) The enzymatic conversion of group A/B red blood cells into group O red blood cells (“universal donor”) is an active area of ​​research, with work on enzymes derived from the gut microbiota being highlighted in the scientific literature. (JBC) (Nature) Laboratory-grown red blood cells have been the subject of a first human clinical trial in the UK (RESTORE); their short-term use is planned only for specific and complex needs. (NHS Blood and Transplant) Lyophilized plasma has logistical advantages (stability at room temperature, rapid reconstitution) and is discussed in the trauma literature. (ScienceDirect) Example of a current shortage: NHS Blood and Transplant has issued an amber alert, with O negative blood stocks deemed critical by mid-2024 (a stark example of how quickly such a situation can arise). (Financial Times)