Mutant Mos1 mariner transposons are hyperactive in Aedes aegypti

Area of Science:

• Molecular Biology
• Genetics
• Vector Control

Background:

• Genetic strategies for controlling mosquito-borne diseases using class II transposons are limited by low transformation rates and lack of post-integration mobility.
• The Mos1 mariner transposon system is a key tool, but its efficiency needs improvement for effective disease vector control.

Purpose of the Study:

• To enhance the transpositional activity and integrity of Mos1-derived transposons.
• To evaluate the efficacy of engineered Mos1 transposase mutants for germline transformation in Aedes aegypti.

Main Methods:

• Site-directed mutagenesis was used to create two Mos1 transposase mutants (E137K and E264R).
• Interplasmid transposition assays were performed in Escherichia coli and Aedes aegypti.
• Transpositional activity and integrity were assessed using transposon constructs with imperfect and perfect inverted terminal repeats (ITRs).

Main Results:

• Mutant transposases significantly increased transpositional activity of Mos1 transposons in E. coli.
• In Aedes aegypti, mutant transposases enhanced transposition frequency and integrity of the perfect repeat transposon.
• The E264R mutant showed a notable increase in transposition frequency and improved transposition integrity in mosquitoes.

Conclusions:

• Engineered Mos1 transposase mutants (E137K, E264R) improve transpositional activity and integrity.
• The perfect repeat Mos1 transposon with mutant transposases shows potential for enhanced germline transformation in Aedes aegypti.
• These findings contribute to the development of advanced genetic tools for mosquito vector control.