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Delivery of Nucleic Acids through Embryo Microinjection in the Worldwide Agricultural Pest Insect, Ceratitis capitata
Published on: October 1, 2016
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Decoding and engineering temperature-sensitive lethality in Ceratitis capitata for pest control
Roswitha A Aumann1,2, Georgia Gouvi3,4, Maria-Eleni Gregoriou3
1Department of Insect Biotechnology in Plant Protection, Institute for Insect Biotechnology, Justus-Liebig-University Gießen, Gießen 35394, Germany.
Summary
Researchers identified a specific mutation in the Lysyl-tRNA synthetase gene responsible for temperature-sensitive lethality in the Mediterranean fruit fly. This breakthrough could enable the development of genetic sexing strains for more efficient sterile insect technique programs.
Area of Science:
- Genetics
- Entomology
- Molecular Biology
Background:
- The Sterile Insect Technique (SIT) is an eco-friendly pest control method relying on releasing sterile insects.
- Genetic sexing strains (GSS) are crucial for efficient SIT by enabling male-only releases, particularly for mosquito control.
- Developing GSS has been challenging, with a past temperature-sensitive lethal (tsl)-based GSS in *Ceratitis capitata* not being replicated in other pests.
Purpose of the Study:
- To pinpoint the genetic basis of the temperature-sensitive lethal (tsl) phenotype in *Ceratitis capitata*.
- To validate the identified mutation's role in the tsl phenotype.
- To assess the potential for creating novel GSS in other insect pests.
Main Methods:
- Detailed genetic analysis of the *Ceratitis capitata* lysine--tRNA ligase (LysRS) gene.
- Introduction of a specific *LysRS* mutation into a wild-type strain.
- Phenotypic assessment of engineered strains under varying temperature conditions.
- Complementation test using a randomly integrated *LysRS* minigene.
Main Results:
- A specific mutation in the *C. capitata LysRS* gene was identified as the cause of the tsl phenotype.
- Introducing this mutation into a wild-type strain successfully replicated the embryonic lethality under heat stress.
- The tsl phenotype was reversed by the random integration of an *LysRS* minigene, confirming the mutation's causative role.
Conclusions:
- The identified *LysRS* mutation is responsible for the temperature-sensitive lethal phenotype in *Ceratitis capitata*.
- The high conservation of the *LysRS* gene across insect species suggests potential for developing tsl-based GSS in various pest insects.
- This research paves the way for expanding SIT applications in agriculture and disease prevention through improved GSS development.
