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Temperature-Inducible Precision-Guided Sterile Insect Technique.

Nikolay P Kandul1, Junru Liu1, Omar S Akbari1

  • 1Division of Biological Sciences, Section of Cell and Developmental Biology, University of California, San Diego, La Jolla, California, USA.

The CRISPR Journal
|November 4, 2021
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Summary

A new temperature-inducible precision-guided sterile insect technique (TI-pgSIT) was developed for insect control. This method creates a true-breeding strain, eliminating the need for sex sorting and potentially automating sterile male production.

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Area of Science:

  • Entomology
  • Genetics
  • Pest Management

Background:

  • Sterile insect technique (SIT) relies on releasing sterile males to control insect populations.
  • Precision-guided sterile insect technique (pgSIT) uses CRISPR to generate sterile males but requires crossing two strains.
  • Current methods necessitate sex sorting of insects, adding complexity to mass production.

Purpose of the Study:

  • To develop a next-generation temperature-inducible pgSIT (TI-pgSIT).
  • To eliminate the need for crossing parental strains in pgSIT.
  • To demonstrate proof-of-concept for TI-pgSIT in Drosophila melanogaster.

Main Methods:

  • Genetic engineering of a temperature-inducible Cas9 and gRNA system.
  • Development of a true-breeding TI-pgSIT strain in Drosophila melanogaster.
  • Evaluation of the TI-pgSIT system's efficacy and breeding characteristics.

Main Results:

  • Successfully developed a temperature-inducible pgSIT (TI-pgSIT) system.
  • Created a true-breeding TI-pgSIT strain, removing the requirement for parental strain crosses.
  • Demonstrated proof-of-concept in Drosophila melanogaster, showing potential for automated production.

Conclusions:

  • TI-pgSIT offers a more efficient approach to producing sterile males for insect control.
  • Eliminating the need for sex sorting simplifies and potentially automates sterile insect production.
  • This technology advances SIT by improving scalability and reducing operational complexity.