Three sera defining a new granulocyte-monocyte-T-lymphocyte antigen

Area of Science:

• Immunology
• Genetics
• Hematology

Background:

• Antibodies to previously undescribed antigens can arise in multiparous donors.
• Characterizing novel antigens is crucial for transfusion medicine and understanding immune responses.

Purpose of the Study:

• To identify and characterize a novel granulocyte antigen recognized by antibodies in multiparous donors.
• To determine the antigen's expression on various blood cells and its inheritance pattern.

Main Methods:

• Granulocyte agglutination assay was used to detect antibodies.
• Testing included reactivity with known neutrophil antigens, red blood cells, HLA, and autologous cells.
• Absorption studies and family studies were conducted to analyze antigen properties and inheritance.

Main Results:

• Three sera identified a novel granulocyte antigen, distinct from known blood group systems.
• The antigen is highly expressed on granulocytes and monocytes, present on T lymphocytes, but absent on B lymphocytes, red cells, and platelets.
• Autosomal dominant inheritance was observed with a high gene frequency (0.906), showing no association with HLA, NA, Rh, or sex chromosomes.

Conclusions:

• A novel granulocyte antigen, highly prevalent in the population, has been identified.
• The antigen's genetic basis is autosomal dominant, with a high gene frequency.
• This discovery contributes to understanding granulocyte antigen systems and may have implications for transfusion compatibility.