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Updated: Aug 27, 2026
Multiplexed Isothermal Amplification Based Diagnostic Platform to Detect Zika, Chikungunya, and Dengue 1
Published on: March 13, 2018
Rapid and femtogram-level sensitive detection of Blastocystis spp. using colorimetric and fluorometric LAMP assays:
Roaa Zedan1,2, Huseyin Tombuloglu2, Ayman Elbadry3
1Master Program of Biotechnology, Institute for Research and Medical Consultations, Imam Abdulrahman Bin Faisal University, Dammam 31441, Saudi Arabia.
Background/Aim:
Blastocystis spp. is a genetically diverse protozoan parasite, often underdiagnosed due to low sensitivity and technical issues of current diagnosis techniques, wet mount microscopy, and PCR. To bridge this gap, we developed loop-mediated isothermal amplification (LAMP) platforms, namely colorimetric LAMP (cLAMP) and fluorometric LAMP (fLAMP) for rapid and sensitive detection of Blastocystis spp.
Materials And Methods:
A cohort of 197 stool samples from patients with gastrointestinal conditions were screened. The diagnostic performance, analytical sensitivity, and speed of the LAMP assays were benchmarked against a gold-standard quantitative PCR assay.
Results:
Results showed that both LAMP assays provided ultra-rapid detection, achieving mean detection times of 24.2 min for fLAMP and 29.8 min for cLAMP (compared to 36.5 min for qPCR; P < .001). In analytical sensitivity evaluations using purified plasmid DNA controls, both assays achieved femtogram-level limits of detection (LoD) (5 fg μL-1). In clinical copro-DNA matrices, fLAMP and cLAMP demonstrated LoD of 1.43 pg μL-1 and 14.3 pg μL-1, respectively. In clinical cohort evaluations, fLAMP demonstrated superior diagnostic sensitivity (94.1%) and overall accuracy (92.3%), while cLAMP offered high diagnostic sensitivity (95.8%), specificity (85.0%), and accuracy (90.1%) with naked-eye visual interpretation.
Conclusion:
This study introduces a dual-platform LAMP system offering femtogram-level sensitivity and rapid detection of Blastocystis spp. within 30 min following DNA extraction. While fLAMP provides high-precision diagnostic accuracy, cLAMP offers an accessible, visual screening tool well-suited for low-resource environments.
