Improvement on the Genetic Engineering of an Invasive Agricultural Pest Insect, the Cherry Vinegar Fly, Drosophila Suzukii

Overview

Journal BMC Genet

Publisher Biomed Central

Specialties Biotechnology
Molecular Biology

Date 2020 Dec 19

PMID 33339511

Citations 2

Authors

Hassan M M Ahmed

Fabienne Heese

Ernst A Wimmer

Affiliations

Soon will be listed here.

Abstract

Background: The invasive fly Drosophila suzukii has become an established fruit pest in Europe, the USA, and South America with no effective and safe pest management. Genetic engineering enables the development of transgene-based novel genetic control strategies against insect pests and disease vectors. This, however, requires the establishment of reliable germline transformation techniques. Previous studies have shown that D. suzukii is amenable to transgenesis using the transposon-based vectors piggyBac and Minos, site-specific recombination (lox/Cre), and CRISPR/Cas9 genome editing.

Results: We experienced differences in the usability of piggyBac-based germline transformation in different strains of D. suzukii: we obtained no transgenic lines in a US strain, a single rare transgenic line in an Italian strain, but observed a reliable transformation rate of 2.5 to 11% in a strain from the French Alps. This difference in efficiency was confirmed by comparative examination of these three strains. In addition, we used an attP landing site line to successfully established φC31-integrase-mediated plasmid integration at a rate of 10% and generated landing site lines with two attP sequences to effectively perform φC31-Recombinase Mediated Cassette Exchange (φC31-RMCE) with 11% efficiency. Moreover, we isolated and used the endogenous regulatory regions of Ds nanos to express φC31 integrase maternally to generate self-docking lines for φC31-RMCE. Besides, we isolated the promoter/enhancer of Ds serendipity α to drive the heterologous tetracycline-controlled transactivator (tTA) during early embryonic development and generated a testes-specific tTA driver line using the endogenous beta-2-tubulin (β2t) promoter/enhancer.

Conclusion: Our results provide evidence that the D. suzukii strain AM derived from the French Alps is more suitable for piggyBac germline transformation than other strains. We demonstrated the feasibility of using φC31-RMCE in the cherry vinegar fly and generated a set of lines that can be used for highly efficient integration of larger constructs. The φC31-based integration will facilitate modification and stabilization of previously generated transgenic lines that carry at least one attP site in the transgene construction. An early embryo-specific and a spermatogenesis-specific driver line were generated for future use of the binary expression system tet-off to engineer tissue- and stage-specific effector gene expression for genetic pest control strategies.

Citing Articles

Improved Transformation with Capped Transposase mRNA in Pest Insects.

Hacker I, Rehling T, Schlosser H, Mayorga-Ch D, Heilig M, Yan Y Int J Mol Sci. 2023; 24(20).

PMID: 37894833 PMC: 10606561. DOI: 10.3390/ijms242015155.

Joint FAO/IAEA coordinated research project on "comparing rearing efficiency and competitiveness of sterile male strains produced by genetic, transgenic or symbiont-based technologies".

Bourtzis K, Caceres C, Schetelig M BMC Genet. 2020; 21(Suppl 2):148.

PMID: 33339502 PMC: 7747360. DOI: 10.1186/s12863-020-00931-6.

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