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Developing EPIC markers for chalcidoid Hymenoptera from EST and genomic data.

Konrad Lohse1, Barbara Sharanowski, Mark Blaxter

  • 1Institute of Evolutionary Biology, University of Edinburgh, Edinburgh EH9 3JT, UK. konrad.lohse@gmail.com

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|April 13, 2011
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Summary

Researchers developed exon-primed-intron-crossing (EPIC) loci for studying insect population genetics. These new genetic markers are effective for phylogeographic history research across diverse insect species.

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Area of Science:

  • Molecular Ecology
  • Evolutionary Biology
  • Genomics

Background:

  • Comparative phylogeographic studies require multi-locus sequence data for accurate inferences.
  • Such comprehensive data are scarce for non-model insect systems, hindering broad evolutionary research.
  • Existing genomic data and expressed sequence tags (ESTs) offer potential for marker development.

Purpose of the Study:

  • To design and validate a large set of novel genetic markers for phylogeographic and population genetic analyses in insects.
  • To assess the cross-taxonomic utility of these markers across various Hymenoptera species.
  • To evaluate the feasibility of using exon-primed-intron-crossing (EPIC) loci for non-model organisms.

Main Methods:

  • Designed 40 intron-crossing primers, primarily targeting ribosomal proteins, using genomic data and ESTs from Hymenoptera.
  • Tested primer amplification success across a range of chalcidoid parasitoid taxa and other gall/fig wasps.
  • Assessed genetic diversity within Western Palaearctic refugia for two species to evaluate locus utility.

Main Results:

  • Successfully designed a substantial number of exon-primed-intron-crossing (EPIC) loci.
  • Demonstrated that these EPIC loci amplify effectively across a broad taxonomic range within insects.
  • Confirmed the utility of these loci for investigating phylogeographic history within species.

Conclusions:

  • It is feasible to develop numerous informative EPIC loci for phylogeographic studies in insects.
  • These markers provide a valuable tool for population genetic research in non-model insect systems.
  • The developed markers facilitate comparative inferences about the evolutionary histories of co-distributed species.