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Alpha-1 antitrypsin levels and prevalence of Pi variant phenotypes in asthmatic children

R M Katz, J Lieberman, S C Siegel

    The Journal of Allergy and Clinical Immunology
    |January 1, 1976
    PubMed

    Insights

    Severe asthma in children may be linked to specific alpha-1 antitrypsin (AAT) variants. Steroid-dependent asthma cases showed a higher prevalence of AAT Z heterozygote variants compared to controls.

    Area of Science:

    • Pulmonology
    • Genetics
    • Immunology

    Background:

    • Severe atopic bronchial asthma is a significant pediatric respiratory condition.
    • Alpha-1 antitrypsin (AAT) deficiency is a known risk factor for lung disease.
    • The role of specific AAT phenotypes in severe childhood asthma requires further investigation.

    Purpose of the Study:

    • To investigate the association between alpha-1 antitrypsin (AAT) levels and phenotypes in children with severe atopic bronchial asthma.
    • To compare AAT profiles in children with severe asthma to a healthy control group.
    • To determine if specific AAT variants are more prevalent in steroid-dependent asthma.

    Main Methods:

    • Screening of 151 children with severe atopic bronchial asthma for AAT levels using the STIC and RID methods.
    • Phenotyping of AAT using acid starch electrophoresis and crossed immunoelectrophoresis.
    • Comparison of AAT data with a control group of children without pulmonary issues.

    Main Results:

    • No significant difference in the overall incidence of AAT deficiency or 3% phenotype Z variants between asthmatic and control groups.
    • Children with steroid-dependent severe asthma exhibited a higher proportion of AAT Z heterozygote variants.
    • This suggests a potential genetic predisposition associated with specific AAT variants in severe, steroid-dependent pediatric asthma.

    Conclusions:

    • Specific alpha-1 antitrypsin (AAT) Z heterozygote variants may be associated with steroid-dependent severe childhood asthma.
    • Further research is warranted to elucidate the precise role of AAT genetics in pediatric asthma pathogenesis.
    • These findings could inform future genetic screening and personalized treatment approaches for severe asthma.

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