Revision summary
Immunogenetics studies genes of antigens and immune response. ABO and Rh govern transfusion and newborn haemolysis. HLA matching is central to transplantation. HLA alleles associate with autoimmune disease. Population HLA maps are anthropological, not racial medicine.
Model answer
Introduction
Immunogenetics is the genetics of the immune system. It studies inherited variation in antigens, antibodies, and the loci that decide transplant and disease risk.
Body
Core
- Blood-group antigens are immune structures: ABO and Rh decide transfusion and haemolytic disease of the newborn.
- HLA (MHC) on chromosome 6 is the densest human immunogenetic map. Matching matters in kidney and bone-marrow grafts.
- Antibody allotypes (Gm, Km) and immunoglobulin gene rearrangements join Mendelian inheritance to somatic diversity.
Examples
- Landsteiner found ABO. Levine linked Rh to newborn jaundice.
- Ankylosing spondylitis and HLA-B27, coeliac and HLA-DQ, type 1 diabetes and DR/DQ haplotypes.
- G6PD and some complement loci sit on the border of immuno-haematology and infection.
- Hybridoma and now sequencing of TCR and BCR repertoires are laboratory immunogenetics.
Anthropology
- HLA clines and Indian caste-tribe samples are used in population history, with care against racial medical myths.
Flow diagram
flowchart TD IG[Immunogenetics] --> ABO[ABO Rh transfusion] IG --> HLA[MHC transplant disease] IG --> AB[Antibody allotypes]
Conclusion
Immunogenetics is inherited immune variation. ABO, Rh, and HLA are the teaching trio, with disease associations and transplant matching as the applied face.
Quick related
Students also ask
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Is every immune trait Mendelian?
Germline HLA and ABO are. Antibody specificity also uses somatic recombination.
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Why does anthropology teach HLA?
It is both clinical matching and a highly polymorphic record of population history.
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