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Serum Gm allotype development during childhood.

V A Oxelius1, M Aurivillius, A M Carlsson

  • 1Department of Pediatrics and Clinical Immunology, University Hospital, Se-221 85 Lund, Sweden.

Scandinavian Journal of Immunology
|October 16, 1999
PubMed
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This study reveals that different genetic variants of immunoglobulin G (Gm allotypes) mature at varying rates in children, impacting antibody responses. Specifically, G2m(n) development is notably slower than G2m(-n).

Area of Science:

  • Immunogenetics
  • Pediatric Immunology
  • Molecular Biology

Background:

  • Gm allotypes are inherited genetic variants of immunoglobulin heavy G chains (IGHG) influencing IgG subclass levels.
  • Previous studies established Gm allotype levels in adults, but their developmental patterns in children were less understood.

Purpose of the Study:

  • To investigate the serum levels of specific Gm allotypes and their corresponding IgG subclasses in healthy children aged 1-15 years.
  • To analyze the differential maturation rates of Gm allotypes within IgG1, IgG2, and IgG3 subclasses.
  • To correlate Gm allotype development with potential variations in antibody responses during childhood.

Main Methods:

  • Competitive enzyme-linked immunosorbent assay (ELISA) and radial immunodiffusion were used to quantify Gm allotypes and IgG subclasses.

Related Experiment Videos

  • Serum samples from 430 healthy children across different age groups were analyzed.
  • Focus was on six common Gm genotypes and specific allotypes: G1m(a/f), G2m(n/-n), and G3m(g/b).

    • Main Results:

    • Significant differences in maturation rates were observed among Gm allotypes within IgG1, IgG2, and IgG3 subclasses.
    • G2m(n) showed markedly retarded development compared to G2m(-n) across various genotypes.
    • G1m(f) levels often dominated G1m(a) in heterozygous individuals, while G3m(b) levels were higher than G3m(g) in individuals over 3 years old.

    Conclusions:

    • Differential maturation rates of Gm allotypes, particularly the retarded development of G2m(n), contribute to variations in antibody responses during childhood.
    • Quantitative Gm allotype determination provides insights into IGHG gene activity and offers a basis for evaluating IgG antibodies in pediatric diseases.
    • Understanding these genetic influences is crucial for interpreting immune system development and function in children.