Evaluation of Propidium Monoazide Real-Time PCR for Early Detection of Viable Mycobacterium tuberculosis in Clinical Respiratory Specimens
- Authors
- Kim, Young Jin; Lee, Sun Min; Park, Byung Kyu; Kim, Sung Soo; Yi, Jongyoun; Kim, Hyung Hoi; Lee, Eun Yup; Chang, Chulhun Ludgerus
- Issue Date
- 5월-2014
- Publisher
- KOREAN SOC LABORATORY MEDICINE
- Keywords
- Mycobacterium tuberculosis; Propidium monoazide; Real-time PCR
- Citation
- ANNALS OF LABORATORY MEDICINE, v.34, no.3, pp.203 - 209
- Indexed
- SCIE
SCOPUS
KCI
- Journal Title
- ANNALS OF LABORATORY MEDICINE
- Volume
- 34
- Number
- 3
- Start Page
- 203
- End Page
- 209
- URI
- https://scholar.korea.ac.kr/handle/2021.sw.korea/98623
- DOI
- 10.3343/alm.2014.34.3.203
- ISSN
- 2234-3806
- Abstract
- Background: Conventional acid-fast bacilli (AFB) staining cannot differentiate viable from dead cells. Propidium monoazide (PMA) is a photoreactive DNA-binding dye that inhibits PCR amplification by DNA modification. We evaluated whether PMA real-time PCR is suitable for the early detection of viable Mycobacterium tuberculosis (MTB) in clinical respiratory specimens. Methods: A total of 15 diluted suspensions from 5 clinical MTB isolates were quadruplicated and subjected to PMA treatment and/or heat inactivation. Eighty-three AFB-positive sputum samples were also tested to compare the ACT values (CT value in PMA-treated sputum samples CT value in non-PMA-treated sputum samples) between culture-positive and culture-negative specimens. Real-time PCR was performed using Anyplex MTB/NTM Real-Time Detection (Seegene, Korea), and the CT value changes after PMA treatment were compared between culture-positive and culture-negative groups. Results: In MTB suspensions, the increase in the Cr value after PMA treatment was significant in dead cells (P=0.0001) but not in live cells (P=0.1070). In 14 culture-negative sputum samples, the median ACT value was 5.3 (95% confidence interval [Cl], 4.1-8.2; P<0.0001), whereas that in 69 culture-positive sputum samples was 1.1 (95% Cl, 0.72.0). In the ROC curve analysis, the cutoff ACT value for maximum sensitivity (89.9%) and specificity (85.7%) for differentiating dead from live cells was 3.4. Conclusions: PMA real-time PCR is a useful approach for differentiating dead from live bacilli in AFB smear-positive sputum samples.
- Files in This Item
- There are no files associated with this item.
- Appears in
Collections - College of Medicine > Department of Medical Science > 1. Journal Articles
Items in ScholarWorks are protected by copyright, with all rights reserved, unless otherwise indicated.