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Optimization of isothermal amplification method for Mycobacteriumtuberculosisdetection and visualization method for

Hatice Esra Ağel1, Hasan Sağcan2, Ismail Ceyhan3

  • 1Materials Institute, TÜBİTAK Marmara Research Center, Kocaeli, Turkey

Turkish Journal of Medical Sciences
|March 11, 2020
PubMed
Summary

This study optimized the loop-mediated isothermal amplification (LAMP) method for rapid tuberculosis diagnosis. The developed LAMP assay offers a fast, sensitive, and specific diagnostic tool for tuberculosis detection in field settings.

Keywords:
Mycobacterium tuberculosiscolorimetric detectionlateral flow dipstickloop-mediated isothermal amplificationpoint of care

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Area of Science:

  • Molecular Biology
  • Infectious Diseases
  • Biotechnology

Background:

  • Tuberculosis (TB) remains a major global health concern, necessitating rapid diagnostic methods.
  • Current gold standard TB diagnosis (culture) is time-consuming, delaying treatment and disease control.
  • Faster diagnostics are crucial for preventing TB transmission and improving patient outcomes.

Purpose of the Study:

  • To optimize the loop-mediated isothermal amplification (LAMP) method for tuberculosis diagnosis.
  • To develop a rapid, sensitive, and specific assay for Mycobacterium tuberculosis detection.
  • To evaluate the LAMP method's performance using sputum samples.

Main Methods:

  • DNA extraction from sputum samples using QIAGEN QIAamp DNA mini kit.
  • Design of LAMP primers targeting the IS6110 gene of Mycobacterium tuberculosis.
  • Optimization of LAMP reaction conditions, including temperature (71.4 °C) and comparison with RT-PCR.

Main Results:

  • The optimized LAMP method achieved a detection limit of 102 CFU/mL.
  • Sensitivity was determined to be 100% against five different Mycobacterium species.
  • Visualisation methods included lateral flow dipsticks and colorimetric detection.

Conclusions:

  • The optimized LAMP assay, particularly LAMP-LFD and colorimetric LAMP, is a reliable tool for rapid tuberculosis diagnosis.
  • This method offers a sensitive and specific alternative for field-based TB detection.
  • The study highlights the potential of LAMP for timely diagnosis and improved TB control strategies.