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Journal Article
Research Support, Non-U.S. Gov't
Extensive deletion of immunoglobulin heavy chain constant region genes in the absence of recurrent infections: when is IgG subclass deficiency clinically relevant?
Clinical Immunology and Immunopathology 1993 July
This report describes two children with undetectable serum levels of IgA1, IgG2, IgG4, and IgE due to a homozygous deletion encompassing the A1-E genes. The father is a heterozygous carrier of the same deletion and the mother a heterozygous compound carrying the deletion on one chromosome and duplication on the other. In both children, serum IgG, IgG1, and IgG3 were higher than in normal children and IgG antibody response to tetanus toxoid and polysaccharide antigens was normal with increased IgG1 and IgG3 response compared to controls. The latter can be interpreted as a compensatory mechanism for the subclass deficit and may explain the lack of significant infections in both children. The importance of distinguishing IgG subclass deficiency due to gene deletion from that due to immunoregulatory dysfunction is discussed.
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