A. Production of H substance
B. Production of glycosyltransferase enzyme
C. Addition of an extra group
D. Formation of A and B antigen
Choose the correct answer from the options given below :
Understanding ABO Blood Group Antigen Production
The production of antigens in the ABO blood group system follows a specific biological pathway. Understanding this sequence is crucial for blood typing and transfusion compatibility.
Step-by-Step Antigen Formation Sequence
The correct order involves the initial formation of a precursor substance, the synthesis of specific enzymes, the enzymatic action, and the final antigen manifestation.
- Production of H substance (A): This is the initial step where the H antigen is synthesized. The H gene encodes an enzyme (fucosyltransferase) that adds a fucose residue to a precursor chain, forming the H substance. This acts as the foundational structure.
- Production of glycosyltransferase enzyme (B): Following the H substance formation, genes at the ABO locus (A, B, O alleles) are expressed. These genes code for specific glycosyltransferase enzymes. The type of enzyme produced depends on the individual's ABO genotype.
- Addition of an extra group (C): The glycosyltransferase enzymes synthesized in the previous step act upon the H substance. They attach a specific terminal sugar molecule. The A gene codes for an enzyme that adds N-acetylgalactosamine, while the B gene codes for an enzyme that adds galactose. This enzymatic addition is the critical modification step.
- Formation of A and B antigen (D): The result of the enzyme adding the specific sugar to the H substance is the final A or B antigen. If an individual has both A and B alleles (genotype AB), both enzymes are active, leading to the formation of both A and B antigens on the red blood cells.
Therefore, the correct sequence is A-B-C-D.
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In the light of the above statements, choose the most appropriate answer from the options given below :
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