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Parasite Burden of Trypanosoma cruzi in Whole Blood and Buffy Coat Determined by Real-Time PCR in Individuals with
Daniela Liempi1,2, Inés Zulantay3, Nelson M Varela4
1Institute of Parasitology, Faculty of Medicine, Austral University of Chile, Valdivia 5090000, Chile.
Microorganisms
|February 24, 2024
Summary
This study compared Trypanosoma cruzi parasite loads in blood samples. Buffy coat samples yielded higher DNA concentration and purity, correlating with parasite load, though parasite detection did not significantly differ across sample types.
Area of Science:
- Molecular Biology
- Parasitology
- Infectious Diseases
Background:
- Chagas disease (ChD) diagnosis relies on detecting Trypanosoma cruzi.
- Accurate quantification of parasite load is crucial for understanding disease progression and treatment efficacy.
- Optimizing DNA extraction methods from blood samples is essential for reliable parasite detection.
Purpose of the Study:
- To compare the circulating Trypanosoma cruzi parasite load in buffy coat versus whole blood samples.
- To evaluate DNA concentration and purity from different blood sample preparations.
- To assess the correlation between DNA yield and parasite load quantification using qPCR.
Main Methods:
- Quantitative Polymerase Chain Reaction (qPCR) was employed to determine parasite load.
- DNA was extracted from buffy coat and whole blood (boiled/unboiled guanidine hydrochloride-EDTA buffer).
- DNA concentration and purity were assessed using a Nanodrop spectrophotometer; statistical analyses included Student's t-test, Chi-squared, and Spearman's correlation.
Main Results:
- Buffy coat samples exhibited significantly higher DNA concentration and purity compared to whole blood samples.
- Trypanosoma cruzi DNA was detectable and quantifiable in all three sample types from seven patients.
- No statistically significant differences in parasite load were observed across the different sample types.
- A higher correlation was found between total DNA concentration and parasite load in buffy coat samples.
Conclusions:
- While buffy coat offers superior DNA yield and purity, it does not significantly alter the quantifiable parasite load of Trypanosoma cruzi in chronic ChD patients.
- The findings suggest that buffy coat may be preferable for DNA extraction in qPCR-based parasite load assessment due to better DNA quality.
- Further research may explore standardized protocols for buffy coat processing to enhance diagnostic sensitivity.
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