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IgG subclasses in childhood infections

¹Department of Immunology, Medical School, University of Birmingham, United Kingdom.

Zhonghua Minguo Xiao Er Ke Yi Xue Hui Za Zhi [Journal]. Zhonghua Minguo Xiao Er Ke Yi Xue Hui

|May 1, 1995

Summary

Selective immunoglobulin G subclass deficiencies can cause recurrent childhood infections. While IgG1 deficiency is severe, IgG2, IgG3, and IgG4 deficiencies may indicate immune system issues, necessitating accurate diagnostic methods.

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Area of Science:

Immunology
Clinical Medicine

Background:

Selective immunoglobulin G subclass (IgGSc) deficiencies are linked to recurrent childhood infections.
IgG1 deficiency presents severely, mimicking panhypogammaglobulinaemia, often requiring immunoglobulin replacement therapy.

Observation:

IgG2 deficiency correlates with infections from encapsulated bacteria like Streptococcus pneumoniae and Haemophilus influenzae.
This deficiency can be transient in children under five, potentially improving with antibiotics and immunization.
IgG3 and IgG4 deficiencies are common in children with recurrent infections, suggesting broader immune dysregulation.

Findings:

Children may exhibit selective IgGSc deficiencies without recurrent infections due to compensatory immune mechanisms.
Accurate IgGSc measurement relies on specific polyclonal antisera, avoiding cross-reactivity.
Monoclonal antibodies are often unsuitable for quantifying IgGSc due to variable allotype detection and limitations in nephelometric/turbidimetric methods.

Implications:

Accurate diagnosis of IgGSc deficiencies is crucial for appropriate patient management.
The findings highlight the importance of reliable diagnostic assays to avoid over-reporting deficiencies.
Understanding compensatory immune factors is key in cases of selective IgGSc deficiency without overt symptoms.

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