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DNA barcodes from century-old type specimens using next-generation sequencing.

Sean W J Prosser1, Jeremy R deWaard1, Scott E Miller2

  • 1Biodiversity Institute of Ontario, University of Guelph, Guelph, ON, Canada.

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Summary
This summary is machine-generated.

Next-generation sequencing successfully recovered DNA barcode sequences from ancient Lepidoptera type specimens. This breakthrough enables reliable species identification from historical insect collections, crucial for taxonomy.

Keywords:
DNA barcodingDNA sequencingdegraded DNAnext-generation sequencingtype specimens

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Area of Science:

  • Entomology
  • Molecular Biology
  • Taxonomy

Background:

  • Type specimens are critical for stable nomenclature, linking names to physical examples.
  • DNA preservation in old specimens is challenging, hindering molecular identification.
  • Previous methods had uncertain success in recovering DNA from aged type specimens.

Purpose of the Study:

  • To assess the efficacy of next-generation sequencing (NGS) for recovering DNA barcode sequences from century-old Lepidoptera type specimens.
  • To evaluate DNA quality in historical insect collections and its impact on sequence recovery.
  • To establish a cost-effective method for obtaining genetic data from valuable type material.

Main Methods:

  • Screened over 1800 Lepidoptera type specimens for DNA quality using Sanger sequencing to obtain short reads (164-bp and 94-bp).
  • Categorized specimens into high, medium, and low DNA quality groups based on Sanger results.
  • Applied a PCR-based NGS protocol to ten specimens from each category, requiring minimal template DNA.

Main Results:

  • NGS successfully recovered DNA barcode sequences (cytochrome c oxidase 1 gene) from all tested specimens across all DNA quality categories.
  • Average read lengths from NGS ranged from 458 bp to 610 bp, significantly longer than Sanger reads.
  • NGS costs were comparable to Sanger sequencing when processing ten specimens per run.

Conclusions:

  • NGS is a powerful and efficient tool for recovering DNA barcode data from degraded DNA in ancient type specimens.
  • This method overcomes previous limitations in DNA sequencing from historical entomological collections.
  • The approach promises broader accessibility to genetic data from type specimens, advancing taxonomic research and biodiversity studies.