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Immunomagnetic separation of Cryptosporidium parvum oocysts using MACS MicroBeads and high gradient separation
M Q Deng1, K M Lam, D O Cliver
1Department of Population Health and Reproduction, School of Veterinary Medicine, University of California at Davis, 95616-8743, USA.
Abstract:
We evaluated the MACS immunomagnetic separation (IMS) system for concentrating Cryptosporidium parvum. Oocysts were first labeled with fluorescein isothiocyanate (FITC) or rabbit anti-C. parvum antibodies, then linked to MicroBeads coated with anti-FITC or anti-rabbit IgG, and separated through a high gradient separation column. Results indicated that over 95% of oocysts were recovered and their fluorescence and infectivity were retained. The presence of MicroBeads showed no effect on genomic DNA extraction and subsequent polymerase chain reaction (PCR)-based analyses, as sensitivity of PCR (10 oocysts) and the band pattern of randomly amplified polymorphic DNA (RAPD) were identical to those using DNAs extracted from normally purified oocysts. IMS-PCR consistently detected as few as 10 oocysts from 100 ml of apple juice or homogenized milk and IMS-IFA could detect 100 oocysts from 1 g of deer manure, demonstrating the efficiency of IMS in recovering oocysts from environmental and food samples. Our results suggest that the MACS IMS system could be used for multiple applications in Cryptosporidium research.
Insights
The MACS immunomagnetic separation (IMS) system effectively concentrates Cryptosporidium parvum oocysts, maintaining their infectivity and enabling sensitive detection in food and environmental samples. This method is valuable for Cryptosporidium research.
Area of Science:
- Parasitology
- Immunology
- Molecular Biology
Background:
- Cryptosporidium parvum is a significant waterborne pathogen.
- Accurate detection of oocysts in environmental and food samples is crucial for public health.
- Existing concentration methods can be labor-intensive and may affect oocyst viability.
Purpose of the Study:
- To evaluate the efficacy of the MACS immunomagnetic separation (IMS) system for concentrating Cryptosporidium parvum oocysts.
- To assess the impact of IMS on oocyst infectivity and downstream molecular analyses.
- To demonstrate the system's utility in detecting oocysts in diverse sample matrices.
Main Methods:
- Oocysts were labeled with antibodies (anti-C. parvum or anti-FITC) and conjugated to MicroBeads.
- Magnetic separation was performed using a high gradient separation column.
- Oocyst recovery, fluorescence, infectivity, DNA extraction, and PCR-based analyses (including RAPD) were assessed.
- Detection limits were determined in apple juice, homogenized milk, and deer manure using IMS-PCR and IMS-IFA.
Main Results:
- The MACS IMS system achieved over 95% oocyst recovery.
- Oocyst fluorescence and infectivity were preserved post-separation.
- MicroBeads did not interfere with genomic DNA extraction or PCR sensitivity (down to 10 oocysts).
- IMS-PCR detected as few as 10 oocysts/100 ml in milk and juice.
- IMS-IFA detected 100 oocysts/g in deer manure.
Conclusions:
- The MACS IMS system is a highly efficient method for concentrating Cryptosporidium parvum oocysts.
- The system preserves oocyst integrity and is compatible with molecular detection techniques like PCR.
- MACS IMS demonstrates significant potential for the sensitive detection of Cryptosporidium in various environmental and food samples, supporting public health surveillance and research.