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How consistent is RAD-seq divergence with DNA-barcode based clustering in insects?

Marie Cariou1, Hélène Henri1, Sonia Martinez1

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DNA barcoding using mitochondrial DNA is a reliable tool for identifying insect species. Despite concerns about mitochondrial introgression, nuclear genome analysis confirms its effectiveness in defining species boundaries.

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Area of Science:

  • Molecular biology
  • Evolutionary biology
  • Genomics

Background:

  • DNA barcoding, particularly mitochondrial DNA, is widely used for species identification.
  • Concerns exist regarding mitochondrial DNA's suitability due to potential introgression facilitated by symbiotic bacteria in insects.

Purpose of the Study:

  • To evaluate nuclear genome divergence in relation to mitochondrial DNA proximity.
  • To assess the reliability of DNA barcoding for insect species delimitation.

Main Methods:

  • RAD-seq data were obtained from 92 insect operational taxonomic units (OTUs) identified by DNA barcoding.
  • Nuclear genome divergence was analyzed across four insect orders.

Main Results:

  • In all cases, median nuclear divergence was below 2%, a threshold associated with potential nuclear gene flow.
  • Mitochondrial introgression between species appears to be a rare event in insects.

Conclusions:

  • DNA barcoding is a reliable method for clustering insect specimens into species-like units.
  • The study supports the utility of mitochondrial DNA barcoding for insect biodiversity assessment.