Anopheles Mosquito Immunity and Plasmodium Interactions

The malaria parasite undergoes a complex developmental cycle within the Anopheles mosquito, encountering multiple immune barriers that shape transmission efficiency. Following ingestion of an infected blood meal, Plasmodium gametocytes transform into ookinetes that traverse the midgut epithelium, where epithelial nitration, reactive oxygen species production and complement-like factors act in concert to eliminate a majority of invading parasites. Survivors develop into oocysts beneath the basal lamina and later release sporozoites that migrate to the salivary glands for onward transmission. Key immune signalling pathways—including the Toll, Imd and JNK cascades—regulate transcription factors that control effector genes such as TEP1, LRIM1/APL1 and fibrinogen-related proteins (FREPs). These effectors mediate lysis, melanisation and phagocytosis of the parasite. Parasites have evolved evasion strategies, including modulation of mosquito redox balance and subversion of nutrient-transport proteins, to enhance survival. Recent advances in genetic manipulation of mosquito immunity and high-resolution gene expression atlases are deepening our understanding of vector competence and informing novel transmission-blocking interventions.

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Anopheles Mosquito Immunity and Plasmodium Interactions publication trend

The graph below shows the total number of articles in anopheles mosquito immunity and plasmodium interactions across all publications each year (not limited to Nature Index journals).

Technical terms

Innate immunity: The mosquito’s first line of defence, comprising preformed barriers, immune signalling cascades and effector molecules that act without prior exposure.

Ookinete: The motile zygote form of Plasmodium that invades the mosquito midgut epithelium.

Oocyst: A cystic stage formed beneath the midgut basal lamina, where Plasmodium undergoes sporogonic development.

Sporozoite: The infectious form released from oocysts that migrates to and invades the salivary glands.

TEP1: A complement-like thioester protein that binds to parasite surfaces, promoting lysis or melanisation.

Imd pathway: An immune signalling cascade activated by microbial recognition that regulates NF-κB transcription factors to induce antimicrobial effectors.

CRISPR/Cas9: A genome editing tool adapted for Anopheles to disrupt or modify genes involved in immunity and vector competence.

References

1. Mosquito immune responses to Plasmodium parasites that limit malaria transmission. Cellular and Molecular Life Sciences (2025).
2. CRISPR/Cas9 -mediated gene knockout of Anopheles gambiae FREP1 suppresses malaria parasite infection. PLOS Pathogens (2018).
3. The Plasmodium bottleneck: malaria parasite losses in the mosquito vector. Memórias do Instituto Oswaldo Cruz (2014).
4. Reactive Oxygen Species Modulate Anopheles gambiae Immunity against Bacteria and Plasmodium *. Journal of Biological Chemistry (2007).
5. A comprehensive gene expression atlas of sex- and tissue-specificity in the malaria vector, Anopheles gambiae. BMC Genomics (2011).
6. Anopheles Fibrinogen-related Proteins Provide Expanded Pattern Recognition Capacity against Bacteria and Malaria Parasites*. Journal of Biological Chemistry (2009).
7. Caspar Controls Resistance to Plasmodium falciparum in Diverse Anopheline Species. PLOS Pathogens (2009).
8. The JNK Pathway Is a Key Mediator of Anopheles gambiae Antiplasmodial Immunity. PLOS Pathogens (2013).
9. Anopheles Imd Pathway Factors and Effectors in Infection Intensity-Dependent Anti-Plasmodium Action. PLOS Pathogens (2012).