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Somatic mutation in anti-phosphorylcholine antibodies
Immunological Reviews
|April 1, 1987
Summary
Somatic mutation in B cells, crucial for antibody affinity, targets specific gene regions after antigen stimulation. This process, likely DNA repair-based, enhances antibody binding and is developmentally controlled.
Area of Science:
- Immunology
- Molecular Biology
- Genetics
Background:
- Somatic mutation in B cells is key to adaptive immunity.
- Understanding the structural basis of somatic mutation in B cells is essential.
Purpose of the Study:
- To analyze genes and proteins in murine immune response to PC.
- To gain structural insights into somatic mutation in B cells.
Main Methods:
- Analysis of murine immune response to PC.
- Nucleotide sequencing of immunoglobulin genes.
- Protein sequence analysis of antibody chains.
Main Results:
- Most anti-PC antibodies use specific VH and VK genes.
- Somatic mutation is developmentally controlled, appearing after 2 weeks post-immunization.
- Mutated antibodies (IgG, IgA) show higher affinity than germline counterparts.
- Mutations are targeted to a 1kb region around the rearranged variable gene at high frequency.
- No mutations were found in IgM antibodies, but half of IgG and IgA antibodies showed mutations.
Conclusions:
- Somatic mutation primarily increases antibody affinity rather than creating new specificities.
- The mechanism of somatic mutation likely involves DNA repair pathways.
- Further dynamic studies are needed to identify mutation targets and involved enzymes.