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Clin Chim Acta. 2014 Jan 1;427:29-33. doi: 10.1016/j.cca.2013.09.042. Epub 2013 Oct 5.

A novel method of detecting alpha-1 antitrypsin deficiency of Z mutant (GAG(342)AAG) in a single PCR reaction using base-quenched probe.

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  • 1Comprehensive Laboratory, Changzhou Key Lab of Individualized Diagnosis and Treatment Associated with High Technology Research, The Third Affiliated Hospital of Soochow University, Changzhou 213003, China.

Abstract

BACKGROUND:

Alpha-1 antitrypsin (A1AT) is a protease inhibitor that protects the tissues from degradation by neutrophil elastase under certain pathological process. Alpha-1 antitrypsin deficiency (A1ATD) could associate with both lung and liver pathogenicities. Of all the deficiency alleles, Z mutant is the most common variant and causes severe complications. Here, we described a novel and quick method to detect Z mutant using the base-quenched probe technique in only one single PCR reaction.

METHODS:

Primers and probe were designed based on the base-quenched probe technique. Two vectors, representing the two genotypes, were constructed as amplification templates for validating the method. The Z mutant (GAG(342)AAG) was analyzed according to the melting curve. Finally, the accuracy was confirmed by direct sequencing.

RESULTS:

Z mutant could be accurately distinguished from the wild type. The wild type resulted in high melting temperature (TM) (48.64±1.33°C), while when the Z mutation was present, the TM was shifted to an obvious low TM (41.38±0.9017°C). The sensitivity reached a low of 10(3) copies of template DNA with a clear melting valley and a complete concordance occurred between this method and the direct DNA sequencing.

CONCLUSION:

The present described method is simple, quick and economic as well as suitable for large-scale genotyping studies and clinical testing of Z mutant in patients with emphysema and cirrhosis.

© 2013. Published by Elsevier B.V. All rights reserved.

KEYWORDS:

Alpha1-antitrypsin deficiency; PIZ mutant; Single nucleotide polymorphism

PMID:
24099880
[PubMed - indexed for MEDLINE]
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