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Pak J Med Sci. 2016 Sep-Oct;32(5):1309-1311.

Why cannot a β-lactamase gene be detected using an efficient molecular diagnostic method?

Author information

1
Kwang Seung Park, National Leading Research Laboratory of Drug Resistance Proteomics, Department of Biological Sciences, Myongji University, Yongin, Republic of Korea.
2
Jung Hun Lee, National Leading Research Laboratory of Drug Resistance Proteomics, Department of Biological Sciences, Myongji University, Yongin, Republic of Korea.
3
Moonhee Park, Faculty of DNA Analysis Division, Seoul institute, National Forensic Service, Seoul, Republic of Korea. National Leading Research Laboratory of Drug Resistance Proteomics, Department of Biological Sciences, Myongji University, Yongin, Republic of Korea.
4
Asad Mustafa Karim, National Leading Research Laboratory of Drug Resistance Proteomics, Department of Biological Sciences, Myongji University, Yongin, Republic of Korea.
5
Sang Hee Lee, National Leading Research Laboratory of Drug Resistance Proteomics, Department of Biological Sciences, Myongji University, Yongin, Republic of Korea.

Abstract

OBJECTIVE:

Fast detection of β-lactamase (bla) genes can minimize the spread of antibiotic resistance. Although several molecular diagnostic methods have been developed to detect limited bla gene types, these methods have significant limitations, such as their failure to detect almost all clinically available bla genes. We have evaluated a further refinement of our fast and accurate molecular method, developed to overcome these limitations, using clinical isolates.

METHODS:

We have recently developed the efficient large-scale bla detection method (large-scaleblaFinder) that can detect bla gene types including almost all clinically available 1,352 bla genes with perfect specificity and sensitivity. Using this method, we have evaluated a further refinement of this method using clinical isolates provided by International Health Management Associates, Inc. (Schaumburg, Illinois, USA). Results were interpreted in a blinded manner by researchers who did not know any information on bla genes harbored by these isolates.

RESULTS:

With only one exception, the large-scaleblaFinder detected all bla genes identified by the provider using microarray and multiplex PCR. In one of the Escherichia coli test isolates, a blaDHA-1 gene was detected using the multiplex PCR assay but it was not detected using the large-scaleblaFinder.

CONCLUSION:

The truncation of a blaDHA-1 gene is an important reason for an efficient molecular diagnostic method (large-scaleblaFinder) not to detect the bla gene.

KEYWORDS:

Large-scale detection; Minimizing antibiotic resistance; Molecular diagnosis; β-Lactamase (bla) gene

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