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Assessing target genes for homing suppression gene drive.

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Gene drives targeting female fertility genes in fruit flies show promise for population control. Drives targeting octopamine receptor and stall genes achieved high efficiency, with one successfully suppressing a caged population.

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Area of Science:

  • Genetics
  • Population Biology
  • Molecular Biology

Background:

  • Gene drives offer a powerful tool for altering wild populations by biasing inheritance.
  • Targeting female fertility genes is a strategic approach for population suppression gene drives.
  • CRISPR-based homing gene drives provide a precise mechanism for gene drive implementation.

Purpose of the Study:

  • To investigate the efficacy of CRISPR-based homing gene drives targeting nine female fertility genes in Drosophila melanogaster for population suppression.
  • To assess drive-conversion efficiency and minimize fitness costs in female drive carriers using multiplexed gRNA strategies.
  • To evaluate the population suppression potential of promising gene drives in cage experiments.

Main Methods:

  • Utilized CRISPR-based homing gene drives targeting nine female fertility genes in Drosophila melanogaster.
  • Employed a multiplexed gRNA approach to prevent resistance allele formation.
  • Assessed drive efficiency in individual crosses and conducted cage experiments for population suppression trials.
  • Investigated fitness costs associated with gene drive carriers, including maternal Cas9 effects.

Main Results:

  • Drive-conversion efficiency varied across the nine targeted fertility genes.
  • Drives targeting the octopamine β2 receptor (oct) and stall (stl) genes showed the highest conversion rates.
  • A stl-targeting drive successfully suppressed a caged population at high release frequency, but failed at lower frequency.
  • Observed fitness costs in female drive carriers, partly attributed to maternal Cas9 deposition, impacting suppression efficiency.

Conclusions:

  • Octopamine receptor and stall genes are identified as promising targets for fertility-based population suppression gene drives.
  • Demonstrated the potential and limitations of fertility-based suppression drives, highlighting the importance of release frequency and fitness costs.
  • Findings provide empirical data to inform the design and assessment of more effective gene drive strategies for population control.