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Multicenter Comparative Study of Six Cryptosporidium parvum DNA Extraction Protocols Including Mechanical
Nicolas Valeix1, Damien Costa2,3, Louise Basmaciyan1,4
1Laboratoire de Parasitologie-Mycologie, Plateforme de Biologie Hospitalo-Universitaire, 2 rue A. Ducoudray, BP 37013, CEDEX, 21070 Dijon, France.
Background:
Nowadays, many commercial kits allow the detection of Cryptosporidium sp. in stool samples after deoxyribonucleic acid (DNA) extraction. Protocols of stool pretreatment have been proposed to optimize oocysts' DNA extraction. Among them, mechanical grinding was reported to improve the performance of Cryptosporidium oocysts' DNA extraction.
Methods:
A multicenter comparative study was conducted within the framework of the French National Reference Center-Expert Laboratory for Cryptosporidiosis. Six extraction systems (i.e., manual or automated) associated with various mechanical pretreatment protocols, were compared for the Cryptosporidium parvum oocyst' DNA extraction, before amplification using the same real-time PCR method targeting.
Results:
The sensitivity of real-time PCR assay was unequally impacted by the pretreatment/extraction protocol. We observed significant differences for the lowest concentrations of C. parvum oocysts (i.e., 0-94.4% and 33.3-100% respectively for 10 and 50 oocysts/mL). All in all, the protocol using Quick DNA Fecal/Soil Microbe-Miniprep® manual kit showed the best performances. In addition, optimal performances of mechanical pretreatment were obtained by combining a grinding duration of 60 s with a speed of 4 m/s using Fastprep24® with Lysing Matrix E®.
Conclusions:
Sample pretreatment, as well as the extraction method, needs to be properly adapted to improve the diagnostic performances of the C. parvum DNA amplification methods.
Insights
Optimizing deoxyribonucleic acid (DNA) extraction from Cryptosporidium oocysts is crucial for accurate detection. Mechanical grinding pretreatment significantly improves DNA extraction efficiency, enhancing diagnostic performance in real-time PCR assays.
Area of Science:
- Parasitology
- Molecular Diagnostics
- Clinical Microbiology
Background:
- Commercial kits enable Cryptosporidium species detection in stool via DNA extraction.
- Stool pretreatment protocols aim to optimize oocyst DNA extraction efficiency.
- Mechanical grinding has shown promise in enhancing Cryptosporidium oocyst DNA recovery.
Purpose of the Study:
- To compare the performance of six different DNA extraction systems combined with mechanical pretreatment protocols.
- To evaluate the impact of pretreatment and extraction methods on Cryptosporidium parvum oocyst DNA extraction sensitivity.
- To identify optimal mechanical pretreatment parameters for improved DNA extraction.
Main Methods:
- A multicenter comparative study involving six DNA extraction systems (manual and automated).
- Comparison of various mechanical pretreatment protocols, including grinding duration and speed.
- Real-time PCR amplification targeting Cryptosporidium parvum DNA following extraction.
Main Results:
- The sensitivity of real-time PCR was significantly influenced by the pretreatment/extraction protocol, especially at low oocyst concentrations.
- The Quick DNA Fecal/Soil Microbe-Miniprep manual kit demonstrated superior performance.
- Optimal mechanical pretreatment involved 60 seconds of grinding at 4 m/s using Fastprep24 with Lysing Matrix E.
Conclusions:
- Effective Cryptosporidium parvum DNA amplification relies on optimized sample pretreatment and DNA extraction methods.
- Mechanical pretreatment, specifically optimized grinding parameters, is essential for enhancing diagnostic sensitivity.
