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Related Experiment Video

Updated: Nov 15, 2025

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Inherently confinable split-drive systems in Drosophila.

Gerard Terradas1,2, Anna B Buchman1, Jared B Bennett3

  • 1Section of Cell and Developmental Biology, University of California, San Diego, La Jolla, CA, USA.

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CRISPR gene drives show promise for controlling disease vectors. This study tested split gene drives in fruit flies, finding they can be confined by combining genetic engineering with natural selection.

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Area of Science:

  • Genetics
  • Molecular Biology
  • Vector Control

Background:

  • CRISPR gene drives utilize homology-directed repair (HDR) for self-replication.
  • Non-homologous end-joining (NHEJ) can create resistance alleles, hindering gene drive spread.
  • Targeting essential genes with recoded sequences may improve gene drive efficacy and control.

Purpose of the Study:

  • To test split gene-drive (sGD) systems in Drosophila melanogaster.
  • To evaluate sGDs targeting essential viability or fertility genes.
  • To assess the impact of NHEJ alleles and develop confinable drive outcomes.

Main Methods:

  • Split gene-drive systems were inserted into essential genes (rab5, rab11, prosalpha2, spo11) in Drosophila melanogaster.
  • Single generation crosses were performed to assess gene drive efficiency and transmission.
  • Multigenerational cage trials were conducted to observe drive trajectories and outcomes.

Main Results:

  • sGDs demonstrated variable copying efficiencies and sex-biased transmission in single crosses.
  • Multigenerational trials showed distinct drive trajectories influenced by chromosome damage and Cas9 phenotypes.
  • The sGD systems exhibited inherently confinable drive outcomes.

Conclusions:

  • Split gene drives targeting essential genes can be effectively controlled.
  • Combining gene drive technology with genetic engineering strategies offers a path to confined gene drive systems.
  • This approach holds potential for revolutionizing vector control strategies.