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Updated: Jun 21, 2026

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Alpha-1-antitrypsin genotyping with mouthwash specimens.

R A Stockley1, E J Campbell

  • 1Dept. of Medicine, Queen Elizabeth Hospital, Birmingham, UK.

The European Respiratory Journal
|June 19, 2001
PubMed
Summary
This summary is machine-generated.

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Genotyping alpha1-antitrypsin (alpha1-AT) deficiency using buccal cells from mouthwash is feasible for remote testing. This method accurately identifies S and Z alleles, revealing potential underdiagnosis of other severe deficiency alleles.

Area of Science:

  • Genetics
  • Molecular Biology
  • Clinical Diagnostics

Background:

  • Alpha1-antitrypsin (alpha1-AT) deficiency diagnosis typically involves concentration and phenotype analysis.
  • Phenotyping alone may not detect null genes, necessitating family studies.
  • Obtaining blood samples from distant patients presents logistical challenges.

Purpose of the Study:

  • To evaluate the feasibility of genotyping alpha1-antitrypsin (alpha1-AT) using buccal cells collected via mouthwash.
  • To assess the utility of this method for remote diagnosis of alpha1-AT deficiency alleles.

Main Methods:

  • Mouthwash samples were collected from 84 patients with diverse alpha1-AT phenotypes.
  • Deoxyribonucleic acid (DNA) was isolated from buccal cells.
  • Polymerase chain reaction (PCR) with a genotyping kit was used to detect S and Z alleles.

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Main Results:

  • 83 out of 84 samples were suitable for DNA amplification.
  • The genotyping assay successfully identified S and Z alleles in all tested samples.
  • Five patients presumed to be Z allele homozygotes were reclassified as heterozygotes for other severe deficiency alleles.

Conclusions:

  • Genotyping alpha1-AT deficiency using buccal cells from mouthwash is a feasible and effective method for remote patient testing.
  • This approach simplifies sample collection and improves diagnostic accuracy.
  • The study suggests that other alpha1-AT deficiency alleles may be more prevalent than previously recognized.