Biomedical Science Letters (대한의생명과학회지)

The Korean Society for Biomedical Laboratory Sciences (대한의생명과학회)
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Probe-based qPCR Assay for Rapid Detection of Predominant Candida glabrata Sequence Type in Korea

  • Bae, Jinyoung (Department of Clinical Laboratory Science, College of Health Sciences, Catholic University of Pusan) ;
  • Lee, Kyung Eun (Department of Clinical Laboratory Science, College of Health Sciences, Catholic University of Pusan) ;
  • Jin, Hyunwoo (Department of Clinical Laboratory Science, College of Health Sciences, Catholic University of Pusan)
  • Received : 2019.10.28
  • Accepted : 2019.11.28
  • Published : 2019.12.31
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Abstract

Recent years have seen an increase in the incidence of candidiasis caused by non-albicans Candida (NAC) species. In fact, C. glabrata is now second only to C. albicans as the most common cause of invasive candidiasis. Therefore, the rapid genotyping specifically for C. glabrata is required for early diagnosis and treatment of candidiasis. A number of genotyping assays have been developed to differentiate C. glabrata sequence types (STs), but they have several limitations. In the previous study, multi-locus sequence typing (MLST) has performed with a total of 101 C. glabrata clinical isolates to analyze the prevalent C. glabrata STs in Korea. A total of 11 different C. glabrata STs were identified and, among them, ST-138 was the most commonly classified. Thus, a novel probe-based quantitative PCR (qPCR) assay was developed and evaluated for rapid and accurate identification of the predominant C. glabrata ST-138 in Korea. Two primer pairs and hybridization probe sets were designed for the amplification of internal transcribed spacer 1 (ITS1) region and TRP1 gene. Analytical sensitivity of the probe-based qPCR assay was 100 ng to 10 pg and 100 ng to 100 pg (per 1 μL), which target ITS1 region and TRP1 gene, respectively. This assay did not react with any other Candida species and bacteria except C. glabrata. Of the 101 clinical isolates, 99 cases (98%) were concordant with MLST results. This novel probe-based qPCR assay proved to be rapid, sensitive, highly specific, reproducible, and cost-effective than other genotyping assay for C. glabrata ST-138 identification.

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References

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