Trend AnalysisBiology & Life Sciences

Gene Drives for Malaria Control: Engineering Mosquito Populations with CRISPR

Malaria killed over 600,000 people in 2022, predominantly children in sub-Saharan Africa. Insecticide-treated nets and indoor residual spraying have reduced transmission but face growing insecticide r...

By Sean K.S. Shin
This blog summarizes research trends based on published paper abstracts. Specific numbers or findings may contain inaccuracies. For scholarly rigor, always consult the original papers cited in each post.

The Question

Malaria killed over 600,000 people in 2022, predominantly children in sub-Saharan Africa. Insecticide-treated nets and indoor residual spraying have reduced transmission but face growing insecticide resistance. CRISPR-based gene drives โ€” genetic elements that bias their own inheritance to spread through populations at super-Mendelian rates โ€” could potentially suppress or modify mosquito populations permanently. Target Forward Genetics' doublesex-targeting gene drive has suppressed laboratory Anopheles populations in cage trials. But should humanity release a self-propagating genetic technology into wild ecosystems? The ecological, ethical, and governance challenges may exceed the technical ones.

Landscape

G.-H. Wang et al. (2024) in the Annual Review of Entomology, comprehensively reviewed gene drive and symbiont-based technologies (Wolbachia, Asaia) for mosquito-borne disease control. They compared suppression drives (reduce population size), modification drives (make mosquitoes resistant to pathogen), and self-limiting drives (spread but eventually decline). Their assessment: suppression drives targeting doublesex show the highest efficacy in laboratory settings but carry the greatest ecological risk.

D'Amato et al. (2024) in Nature Communications, demonstrated that anti-CRISPR Anopheles mosquitoes can inhibit gene drive spread even under challenging behavioural conditions in large cage trials. This finding has dual significance: it shows that anti-CRISPR systems could serve as a "brake" for deployed gene drives (a reversibility mechanism), but it also reveals that natural anti-CRISPR resistance could evolve and render gene drives ineffective in the field.

Larrosa-Godall et al. (2025) documented the challenges of developing a split drive targeting doublesex in Anopheles stephensi โ€” the invasive urban malaria vector that has recently spread to East Africa. Split drives (where the drive element and the Cas9 are at separate genomic locations) offer spatial containment, as the drive cannot persist without both components, but dominant fitness costs โ€” reduced fertility in both sexes carrying the transgene โ€” remain a barrier to field deployment despite very high homing rates (up to 99.8%).

Abraham et al. (2025) proposed integrating gene drives with malaria vaccines (RTS,S, R21) as a combined strategy, arguing that neither approach alone is sufficient for eradication.

Key Claims & Evidence

<
ClaimEvidenceVerdict
Doublesex-targeting gene drives suppress Anopheles populations in large cagesMultiple cage trials demonstrate population collapse (G.-H. Wang et al. 2024)Confirmed in laboratory; field conditions may differ
Anti-CRISPR can inhibit gene drive spreadAnti-CRISPR mosquitoes slow or prevent drive fixation (D'Amato et al. 2024)Demonstrated; serves as both safety mechanism and resistance concern
Split drives offer spatial containmentGene drive cannot persist without co-inherited Cas9 (Larrosa-Godall et al. 2025)Theoretically sound; practical efficiency lower than full drives
Combined vaccine + gene drive strategy improves eradication prospectsNeither alone is sufficient; combination could be synergistic (Abraham et al. 2025)Logical; integrated implementation untested

Open Questions

  • Ecological consequences: What happens to ecosystems if Anopheles mosquitoes are suppressed? Do predators, competitors, and pollinators dependent on mosquitoes suffer?
  • Resistance evolution: Will target-site resistance mutations render gene drives ineffective within years of deployment, similar to insecticide resistance?
  • Governance: Who decides whether to release a gene drive? There is no international regulatory framework for transboundary genetic technologies.
  • Community consent: Gene drives affect shared ecosystems. How should affected communities (often in low-resource settings) participate in deployment decisions?
  • Referenced Papers

    • [1] Wang, G.-H. et al. (2024). Gene Drive and Symbiont Technologies for Mosquito-Borne Disease Control. Annual Review of Entomology. DOI: 10.1146/annurev-ento-012424-011039
    • [2] D'Amato, R. et al. (2024). Anti-CRISPR Anopheles mosquitoes inhibit gene drive spread. Nature Communications, 15, 1670. DOI: 10.1038/s41467-024-44907-x
    • [3] Abraham, I.C. et al. (2025). Integrating malaria vaccine and CRISPR gene drive. Malaria Journal. DOI: 10.1186/s12936-025-05243-7
    • [4] Larrosa-Godall, M. et al. (2025). Split drive targeting dsx in A. stephensi: challenges. Parasites & Vectors. DOI: 10.1186/s13071-025-06688-0
    • [5] Mondal, A. et al. (2024). MGDrivE 3: simulation framework for mosquito genetic control. PLoS Computational Biology. DOI: 10.1371/journal.pcbi.1012133

    References (5)

    Wang, G., Hoffmann, A., & Champer, J. (2025). Gene Drive and Symbiont Technologies for Control of Mosquito-Borne Diseases. Annual Review of Entomology, 70(1), 229-249.
    Dโ€™Amato, R., Taxiarchi, C., Galardini, M., Trusso, A., Minuz, R. L., Grilli, S., et al. (2024). Anti-CRISPR Anopheles mosquitoes inhibit gene drive spread under challenging behavioural conditions in large cages. Nature Communications, 15(1).
    Abraham, I. C., Aboje, J. E., Ukoaka, B. M., Tom-Ayegunle, K., Amjad, M., Abdulkader, A., et al. (2025). Integrating malaria vaccine and CRISPR/Cas9 gene drive: a comprehensive strategy for accelerated malaria eradication. Malaria Journal, 24(1).
    Larrosa-Godall, M., Ang, J. X. D., Leftwich, P. T., Gonzalez, E., Shackleford, L., Nevard, K., et al. (2025). Challenges in developing a split drive targeting dsx for the genetic control of the invasive malaria vector Anopheles stephensi. Parasites & Vectors, 18(1).
    Mondal, A., Sรกnchez C., H. M., & Marshall, J. M. (2024). MGDrivE 3: A decoupled vector-human framework for epidemiological simulation of mosquito genetic control tools and their surveillance. PLOS Computational Biology, 20(5), e1012133.

    Explore this topic deeper

    Search 290M+ papers, detect research gaps, and find what hasn't been studied yet.

    Click to remove unwanted keywords

    Search 8 keywords โ†’