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Related Concept Videos

Blood Typing01:10

Blood Typing

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Understanding an individual's blood group is a critical component of transfusion medicine. It ensures compatibility in blood transfusions, organ transplants, and even during pregnancy. Determining these blood groups involves the ABO and Rh blood typing systems, utilizing specific antigens and corresponding anti-sera to identify an individual's blood type.
Antigens are protein molecules that reside on the surface of red blood cells (RBCs). The ABO and Rh blood typing systems target...
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Blood Transfusion and Agglutination02:45

Blood Transfusion and Agglutination

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Blood transfusion is a therapeutic measure to restore the blood volume after extensive blood loss due to an accident or a medical procedure. Blood transfusion involves drawing a certain amount of blood from a suitable donor and infusing it into the recipient.
History
The history of blood transfusion dates back to the 17th century, when early attempts were made in animals. In 1818 James Blundell, a British doctor, performed the first successful human blood transfusion. Later in 1900, Karl...
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Blood Types02:20

Blood Types

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Human blood is classified into different types based on the presence of antigens on the red blood cell's surface and antibodies in the plasma. Proper identification of blood type is essential for successful blood transfusion. The International Society of Blood Transfusion has identified 38 human blood types based on the surface antigens on the red blood cells. The most common types are ABO, Rh, and MNS blood types.
ABO blood group
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Rh Blood Group01:19

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The Rhesus (Rh) antigen is crucial in determining blood groups and ensuring compatibility during blood transfusions.
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The ABO Blood Group01:12

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The ABO blood group system is a critical element of transfusion medicine, essential for determining blood compatibility in transfusions and organ transplants. It is based on specific antigens, or agglutinogens, present on the surface of red blood cells (RBCs) and corresponding antibodies, or agglutinins, in the blood plasma.
Antigens in the ABO Blood Group System
Antigens are substances that can trigger an immune response, leading to the production of antibodies. In the ABO blood group system,...
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Conjugated Proteins02:50

Conjugated Proteins

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Simple proteins and protein complexes contain only amino acids. In contrast, many other proteins, called conjugated proteins, covalently bond with non-protein moieties.
Nucleoproteins are protein complexes that contain nucleic acids, categorized as deoxyribonucleoproteins (DNPs) or ribonucleoproteins (RNPs) respectively. The nucleosome is a typical example of a DNP where nuclear DNA is associated with histone proteins. The major antigen for the Covid-19 virus SARS-CoV is an RNP that is critical...
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Updated: Feb 16, 2026

Measuring Erythrocyte Complement Receptor 1 Using Flow Cytometry
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No Evidence that Knops Blood Group Polymorphisms Affect Complement Receptor 1 Clustering on Erythrocytes.

O V Swann1, E M Harrison2, D H Opi1,3,4

  • 1Centre for Immunity, Infection and Evolution, Institute of Immunology and Infection Research, School of Biological Sciences, University of Edinburgh, Edinburgh, UK.

Scientific Reports
|December 21, 2017
PubMed
Summary

Complement Receptor 1 (CR1) clustering on red blood cells is linked to copy number, not Knops blood group antigens like Swain-Langley and McCoy. These polymorphisms do not appear to influence CR1 clustering.

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Area of Science:

  • Immunology
  • Genetics
  • Hematology

Background:

  • Complement Receptor 1 (CR1) clustering on erythrocyte membranes is crucial for immune complex processing.
  • CR1 expresses Knops blood group antigens, including Swain-Langley (Sl) and McCoy (McC) polymorphisms, with unknown functional impacts.

Purpose of the Study:

  • To investigate if Sl and McC polymorphisms influence CR1 clustering on erythrocyte membranes.
  • To understand the functional effects of Knops blood group antigen variations.

Main Methods:

  • Immunofluorescence and confocal microscopy were used to analyze CR1 cluster number and volume.
  • Blood samples from 125 healthy Kenyan children were analyzed.

Main Results:

  • CR1 cluster number and volume showed a positive association with CR1 copy number.
  • Individuals with the McCb/McCb genotype had more CR1 clusters, but this effect diminished after accounting for CR1 copy number.
  • No significant association was found between Sl genotype, sickle cell genotype, α+thalassaemia genotype, gender, or age and CR1 clustering.

Conclusions:

  • After adjusting for CR1 copy number, Sl and McCoy polymorphisms do not significantly affect erythrocyte CR1 clustering.
  • The functional consequences of Knops polymorphisms on CR1 remain undetermined.