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Methods for DNA barcoding photosynthetic protists emphasizing the macroalgae and diatoms.

Gary W Saunders1, Daniel C McDevit

  • 1Department of Biology, Centre for Environmental & Molecular Algal Research, University of New Brunswick, Fredericton, NB, Canada. gws@unb.ca

Methods in Molecular Biology (Clifton, N.J.)
|June 12, 2012
PubMed
Summary

This study details DNA barcoding methods for marine algae and diatoms, recommending a two-marker approach using specific genes like LSU D2/D3 for broad surveys and COI-5P, rbcL-3P, or tufA for specific groups.

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Area of Science:

  • Marine Biology
  • Molecular Ecology
  • Genetics

Background:

  • DNA barcoding is crucial for identifying marine macroalgae (brown, red, green) and diatoms.
  • Standardized protocols are needed for efficient specimen collection and high-throughput DNA extraction.

Purpose of the Study:

  • To outline laboratory practices for routine DNA barcode analysis of major marine algal groups and diatoms.
  • To advocate for a two-marker DNA barcoding approach for protists, including eukaryote-wide markers.

Main Methods:

  • Streamlined field protocols for collecting numerous specimens.
  • High-throughput DNA extraction methods adaptable for manual use.
  • Utilizing specific DNA barcode markers: LSU D2/D3 (nuclear ribosomal DNA), COI-5P (mitochondrial DNA), rbcL-3P (plastid DNA), and tufA (plastid DNA).
  • Optimized polymerase chain reaction and DNA sequencing methodologies.

Main Results:

  • A comprehensive guide to DNA barcoding practices for marine algae and diatoms.
  • Identification of primary and secondary barcode markers for different lineages.
  • Advocacy for LSU D2/D3 as a eukaryote-wide secondary marker for ecological surveys.

Conclusions:

  • The described methods facilitate efficient and reliable DNA barcoding of marine protists.
  • The two-marker strategy enhances accuracy and applicability in ecological and environmental studies.
  • This work provides a valuable resource for researchers conducting barcode research on diverse eukaryotic groups.