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Rapid Isolation of Wild Nematodes by Baermann Funnel

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Problematic barcoding in flatworms: A case-study on monogeneans and rhabdocoels (Platyhelminthes).

Maarten P M Vanhove¹, Bart Tessens², Charlotte Schoelinck³

¹Laboratory of Biodiversity and Evolutionary Genomics, Department of Biology, University of Leuven, Leuven, Belgium ; Present address: Department of Botany and Zoology, Faculty of Science, Masaryk University, Brno, Czech Republic.

|January 24, 2014

Summary

Flatworm DNA barcoding using standard COI markers is challenging due to high molecular diversity and contamination. Nuclear ribosomal markers (ITS, 18S/28S rDNA) offer an effective alternative for species identification in flatworms.

Keywords:

Monogenea Rhabdocoela mitochondrial DNA primer design ribosomal DNA turbellarians

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Area of Science:

Zoology
Molecular Biology
Parasitology

Background:

Mitochondrial DNA barcoding is a common tool for species identification.
Flatworms (Platyhelminthes) present unique challenges for DNA barcoding due to high molecular diversity and limited molecular data.
Previous attempts to develop universal flatworm-specific COI markers have been unsuccessful.

Purpose of the Study:

To investigate the limitations of standard COI barcoding in flatworms.
To compare the effectiveness of mitochondrial (COI) and nuclear ribosomal markers (ITS, 18S/28S rDNA) for species assignment in Monogenea and Rhabdocoela.
To assess the utility of nuclear markers for guiding taxon-specific COI primer selection.

Main Methods:

Analysis of molecular variability and contamination issues in flatworm COI sequences.
Comparison of species assignment accuracy using mitochondrial COI and nuclear ribosomal DNA markers.
Evaluation of nuclear ribosomal DNA sequences for their potential to inform COI primer design.

Main Results:

High molecular variability and contamination significantly hinder standard COI barcoding in flatworms.
Nuclear ribosomal markers (ITS, 18S/28S rDNA) are readily available for diverse flatworm groups like Monogenea and Rhabdocoela.
Mitochondrial and nuclear ribosomal markers demonstrate comparable effectiveness for species assignment in flatworms.
Nuclear rDNA sequences can aid in selecting appropriate COI primers for intraspecific studies when available.

Conclusions:

Standard COI barcoding protocols are often ineffective for flatworms, necessitating alternative molecular identification methods.
Nuclear ribosomal markers provide a reliable and accessible alternative for species identification in understudied flatworm taxa.
Nuclear rDNA data can be leveraged to improve future efforts in developing taxon-specific COI markers for flatworms.