hemoclasificaciÓn
TRANSCRIPT
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Hemoclasificación
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Q. What determines a blood group?
A. The antigens on the red cell surface.
intro RhABO productsother groups indications testing dangers
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• Antigens are inherited (Mendelian pattern)
• Real function unknown
• Damn important during transfusion
• Lots of antigens exist (grouped into systems)
• Most important systems: ABO and Rh
intro RhABO productsother groups indications testing dangers
Red Cell Antigens
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What are the antigens?
• A and B
• Some people have A antigen (“type A”)
• Some people have B antigen (“type B”)
• Some people have both A and B (“type AB”)
• Some people have neither A nor B (“type O”)
intro RhABO productsother groups indications testing dangers
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Type A
intro RhABO productsother groups indications testing dangers
What are the antigens?
Type B
Type AB
Type O
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Type A
intro RhABO productsother groups indications testing dangers
So what?
Type B
Type AB
Type O
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How do you make the antigens?
• Start with a protein precursor
• Add fucose to make H antigen
• Add N-acetylgalactosamine to H Ag to make A Ag
• Add galactose to H Ag to make B Ag
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What are the genes?
• H gene
• everyone* has this one
• codes for an enzyme that makes H Ag.
• A, B, and O genes
• everyone has two genes.
• six possible genotypes: AA, BB, AB, AO, BO, OO
• A and B code for enzymes that make A and B antigens.
• O has no gene product*.
* almost!
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Genotype
AntigensBlood type
AAA A
AO
BBB B
BO
AB A and B AB
OO None O
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Recipient blood type
Donor blood type
A A or O*
B B or O
AB AB, A, B, or O
O O
Compatible blood types
* type O = universal dOnor!
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O
A B
AB
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What are the antigens?
• Most important antigen: D!
• “Rh” because discovered using Rhesus monkeys.
• “Rh factor” refers to the D antigen.
• Two alleles: D and d.
• People with the D allele make D antigen and are Rh+.
intro RhABO productsother groups indications testing dangers
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Genotype
AntigensBlood type
DD D Rh +
Dd D Rh +
dd none Rh -
intro RhABO productsother groups indications testing dangers
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What are the antibodies?
• Antibodies in this system are acquired!
• To make anti-D you must:1. lack the D antigen on your red cells2. get exposed to D + blood
• Donor and recipient are tested for the D antigen.
intro RhABO productsother groups indications testing dangers
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