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Multiplex PCR on single unembryonated Ascaris (roundworm) eggs.

Josefine Carlsgart1, Allan Roepstorff, Peter Nejsum

  • 1Danish Centre for Experimental Parasitology, Department of Veterinary Pathobiology, Faculty of Life Sciences, University of Copenhagen, Dyrlaegevej 100, 1870 Frederiksberg C, Copenhagen, Denmark.

Parasitology Research
|December 20, 2008
PubMed
Summary

We developed a simple method to amplify DNA from single Ascaris sp. eggs using polymerase chain reaction (PCR). This technique allows for precise species identification and genetic studies without needing adult worms.

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Area of Science:

  • Parasitology
  • Molecular Biology
  • Genetics

Background:

  • Accurate identification of Ascaris species is crucial for public health and veterinary diagnostics.
  • Current methods for DNA analysis often require multiple adult worms or extensive sample processing.

Purpose of the Study:

  • To develop a sensitive, inexpensive method for DNA isolation and amplification from single unembryonated Ascaris sp. eggs.
  • To enable precise species identification and population genetic studies using minimal starting material.

Main Methods:

  • Mechanical crushing of single unembryonated Ascaris sp. eggs to release contents.
  • Direct application of polymerase chain reaction (PCR) to crude egg contents without purification.
  • Amplification of the ITS1 region of rDNA and three regions of mtDNA using specific primer sets.

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  • Simultaneous amplification of both rDNA and mtDNA in a single PCR reaction.

    • Main Results:

    • Successful DNA amplification from single unembryonated Ascaris sp. eggs.
    • Amplification of both nuclear (rDNA ITS1) and mitochondrial (mtDNA) DNA regions.
    • Demonstration of simultaneous amplification of rDNA and mtDNA from a single egg.
    • The method proved sensitive and inexpensive.

    Conclusions:

    • This single-egg PCR technique offers a highly precise method for Ascaris species identification in various sample types (fecal, environmental, archaeological).
    • It facilitates population genetic studies without the need to collect adult worms, simplifying research and diagnostics.