Transposable elements as population drive mechanisms: specification of critical parameter values

Area of Science:

• Population Genetics
• Molecular Biology
• Entomology

Background:

• Transposable elements (TEs) are mobile genetic sequences.
• TEs have potential applications in genetic engineering for pest control.

Purpose of the Study:

• To determine critical parameter values for TE spread and fixation in insect vector populations.
• To assess the feasibility of using TEs to drive genes into vector populations.

Main Methods:

• Simulated finite diploid vector populations using a density-dependent growth equation.
• Varied parameters including population size, reproductive rate, density dependence, and transposition efficiency.
• Analyzed the spread and fixation dynamics of mobile elements.

Main Results:

• TEs spread and became fixed rapidly (< 50 generations) under specific conditions.
• High transposition efficiency and significant fertility reduction (up to 45%) promoted fixation.
• Population size, transposition efficiency, and initial TE frequency influenced fixation outcomes.
• Elements with high transposition efficiency (>0.75) and moderate fertility reduction (<25%) can fix even in small populations (n=100).

Conclusions:

• Engineered transposons can potentially drive genes into wild insect vector populations.
• The spread and fixation of TEs are dependent on their properties and population parameters.
• Results support the use of TEs for genetic control strategies, such as introducing parasite resistance genes.