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Detection of Cryptosporidium spp. from human faeces by PCR-RFLP, cloning and sequencing

Annalisa Leone1, Giancarlo Ripabelli, Michela Lucia Sammarco

  • 1Department of Health Sciences, University of Molise, via de Sanctis, 86100, Campobasso, Italy.

Parasitology Research
|November 4, 2008
PubMed

Insights

A new nested ABC polymerase chain reaction restriction fragment length polymorphism (PCR-RFLP) assay accurately identifies Cryptosporidium species and genotypes in human faecal samples. This method, combined with sequencing, improves upon previous techniques for epidemiological surveillance.

Area of Science:

  • Molecular biology
  • Parasitology
  • Infectious diseases

Background:

  • Cryptosporidium is a significant cause of diarrheal disease.
  • Accurate species and genotype identification is crucial for understanding transmission and implementing control measures.
  • Previous molecular methods for Cryptosporidium identification had limitations.

Purpose of the Study:

  • To compare and validate a novel nested ABC PCR-RFLP assay for Cryptosporidium parvum oocyst wall protein (COWP) gene fragment amplification.
  • To assess the utility of this assay in identifying Cryptosporidium species and genotypes in human faecal samples.
  • To evaluate the role of cloning and sequencing in resolving complex RFLP patterns.

Main Methods:

  • DNA extraction from human faecal samples.
  • Nested ABC PCR-RFLP targeting the COWP gene using RsaI and AluI enzymes.
  • Cloning and sequencing for samples with ambiguous RFLP results.

Main Results:

  • The ABC-PCR-RFLP assay successfully amplified the COWP gene in all samples.
  • RFLP analysis identified 54 out of 55 restriction profiles, with 72.7% characteristic of C. parvum and 10.9% of C. hominis.
  • Cloning and sequencing identified C. parvum, C. hominis, and three cases of Cryptosporidium meleagridis among mixed or atypical genotypes.

Conclusions:

  • The ABC-PCR-RFLP technique is a rapid, simple, and specific method for Cryptosporidium identification.
  • Complementary use of cloning and sequencing enhances the characterization of mixed or uncharacterized RFLP patterns.
  • These molecular tools provide valuable epidemiological data for disease control interventions.

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