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PiM subtypes in bronchiolitis

G Massi, P Auconi, R Cotumaccio

Helvetica Paediatrica Acta

|May 1, 1982

Summary

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This study found no link between alpha-1-antitrypsin (alpha 1AT) M subtypes and bronchiolitis in children. The M2 and M3 variants do not appear to cause this common childhood respiratory illness.

Area of Science:

Pediatrics
Pulmonology
Genetics

Background:

Decreased alpha-1-antitrypsin (alpha 1AT) levels are noted in pediatric bronchiolitis.
Known alpha 1AT deficiency alleles (Pi S, Z) are not more common in affected children.
Alpha 1AT M subtypes (M2, M3) are hypothesized to contribute to pediatric allergic conditions and adult COPD.

Purpose of the Study:

To investigate the incidence of alpha-1-antitrypsin (alpha 1AT) PiM subtypes in children with bronchiolitis.
To determine if M2 and M3 subtypes are associated with the development of bronchiolitis in pediatric patients.

Main Methods:

Study included 98 children diagnosed with bronchiolitis.
Genotyping was performed to identify the presence of alpha-1-antitrypsin (alpha 1AT) PiM subtypes (M2, M3).

Related Experiment Videos

Incidence of M2 and M3 subtypes in bronchiolitis patients was compared to control groups.

Main Results:

No increased incidence of alpha-1-antitrypsin (alpha 1AT) M2 or M3 subtypes was found in children with bronchiolitis compared to controls.
The study did not observe a higher prevalence of these specific alpha 1AT variants in the patient cohort.

Conclusions:

The findings do not support a pathogenetic role for alpha-1-antitrypsin (alpha 1AT) M subtypes (M2, M3) in the development of bronchiolitis in children.
This research rules out the hypothesis linking specific alpha 1AT M subtypes to childhood bronchiolitis etiology.