Related Experiment Video
Updated: Apr 15, 2026
Development of a Quantitative Recombinase Polymerase Amplification Assay with an Internal Positive Control
Published on: March 30, 2015
Development and Application of a gp60-Based Typing Assay for Cryptosporidium viatorum
C R Stensvold1, K Elwin2, J Winiecka-Krusnell3
1Department of Microbiology and Infection Control, Statens Serum Institut, Copenhagen, Denmark run@ssi.dk.
Abstract:
The apicomplexan intestinal parasites of the genus Cryptosporidium take a major toll on human and animal health and are frequent causes of waterborne outbreaks. Several species and genotypes can infect humans, including Cryptosporidium viatorum, which, to date, has only been found in humans. Molecular characterization of Cryptosporidium spp., critical to epidemiological analyses, is commonly based on gp60 gene analysis, which appears to require bespoke species- or group-specific PCR primers due to extensive genetic diversity across the genus. In this study, we amplified, sequenced, and characterized the gp60 gene of C. viatorum for the first time. Moreover, we developed and validated a gp60 typing assay for this species and applied it to 27 isolates originating from Asia, Africa, and Central America. A single subtype family, XVa, was identified containing multiple alleles.
Insights
This study characterizes the gp60 gene of Cryptosporidium viatorum, a human-specific parasite. A new typing assay identified a single subtype family, XVa, across diverse geographic isolates, aiding in cryptosporidiosis outbreak investigations.
Area of Science:
- * Parasitology and Molecular Biology
- * Infectious Diseases and Epidemiology
Background:
- * Cryptosporidium species are significant apicomplexan intestinal parasites causing human and animal disease, frequently linked to waterborne outbreaks.
- * Accurate molecular characterization of Cryptosporidium is crucial for epidemiological studies, often relying on the polymorphic gp60 gene.
- * Previous gp60 gene analysis required species-specific primers due to high genetic diversity within the Cryptosporidium genus.
Purpose of the Study:
- * To amplify, sequence, and characterize the gp60 gene of Cryptosporidium viatorum for the first time.
- * To develop and validate a gp60 gene typing assay specifically for C. viatorum.
- * To apply the developed assay to diverse C. viatorum isolates for epidemiological insights.
Main Methods:
- * Isolation and amplification of the gp60 gene from C. viatorum.
- * DNA sequencing and phylogenetic analysis of the gp60 gene.
- * Development and validation of a species-specific PCR-based typing assay for C. viatorum gp60.
- * Application of the assay to 27 C. viatorum isolates from Asia, Africa, and Central America.
Main Results:
- * The gp60 gene of C. viatorum was successfully amplified, sequenced, and characterized.
- * A novel gp60 typing assay for C. viatorum was developed and validated.
- * Analysis of 27 isolates revealed a single subtype family, XVa, comprising multiple distinct alleles.
- * The identified subtypes were distributed across isolates from Asia, Africa, and Central America.
Conclusions:
- * The study provides the first molecular characterization of the C. viatorum gp60 gene.
- * The developed gp60 typing assay is effective for differentiating C. viatorum subtypes.
- * The predominance of the XVa subtype family suggests potential clonal expansion or limited diversity within C. viatorum populations globally.
- * This molecular tool will enhance epidemiological surveillance and outbreak investigations of human cryptosporidiosis caused by C. viatorum.
