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Allotype-associated differences in concentrations of human IgG subclasses.

H Sarvas1, N Rautonen, O Mäkelä

  • 1Department of Bacteriology and Immunology, University of Helsinki, Finland.

Journal of Clinical Immunology
|January 1, 1991
PubMed
Summary
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Genetic variations in immunoglobulin (Ig) allotypes influence IgG isotype concentrations in Finnish adults. Specific alleles correlate with higher levels of IgG1, IgG2, and IgG3, but not IgA, IgE, or IgM.

Area of Science:

  • Immunogenetics
  • Human Genetics
  • Clinical Immunology

Background:

  • Immunoglobulin (Ig) isotypes play crucial roles in immune responses.
  • Genetic factors, including allotypes, are known to influence Ig levels.
  • Understanding these associations is vital for interpreting immune status.

Purpose of the Study:

  • To investigate the relationship between immunoglobulin allotypes and isotype concentrations in a Finnish population.
  • To identify specific allotypes associated with variations in Ig isotype levels.
  • To quantify the impact of these allotypes on IgG subclass concentrations.

Main Methods:

  • Sera from 207 Finnish blood donors were analyzed for seven immunoglobulin isotypes (IgA, IgE, IgM, IgG1, IgG2, IgG3, IgG4).
  • Allotyping was performed using anti-Gm antibodies (anti-f, anti-a, anti-x, anti-n).

Related Experiment Videos

  • Phenotypic classification and statistical analysis were used to determine allotype-isotype associations.

    • Main Results:

    • Twelve distinct immunoglobulin allotypes were identified in the study population.
    • Significant differences in IgG1, IgG2, and IgG3 concentrations were observed between different allotypes.
    • Specific alleles (a(x)-IgG1, n-IgG2, b-IgG3) were associated with elevated concentrations of their respective IgG subclasses, with fold differences of 1.2, 1.5, and 2.6, respectively.
    • No significant allotype-associated differences were found for IgA, IgM, or IgE concentrations.

    Conclusions:

    • Immunoglobulin allotypes significantly influence the serum concentrations of IgG subclasses (IgG1, IgG2, IgG3) in the Finnish population.
    • The findings suggest a genetic basis for variations in IgG isotype levels, mediated by specific allotypes.
    • IgA, IgM, and IgE concentrations do not appear to be significantly influenced by the studied Gm allotypes.