ArticlePLoS pathogens2026
Mutualism in disguise: A mosquito parasite with mixed transmission mode displays mutualistic traits promoting oogenesis.
Article in PLoS pathogens, 2026. The graph could read no effect estimate from its abstract, so it casts no vote on the map. Not yet cited in PubMed.
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Abstract
Mutualistic traits are frequently associated with vertically transmitted symbionts, in part because repeated interactions can align host and symbiont fitness. However, how such traits emerge in symbionts combining vertical and horizontal transmission remains unclear. Here we show that Ascogregarina taiwanensis, previously described as a weak horizontally transmitted parasite of the Asian tiger mosquito (Aedes albopictus), also displays mutualistic traits that enhance mosquito reproduction. Infected females show improved embryogenesis and an extended egg-laying period, while most pseudo-vertically transmit oocysts to their progeny at oviposition sites. This interaction ultimately produces larger larvae that are more frequently infected by As. taiwanensis. Dual transcriptomic analyses further reveal that early oogenesis in infected females involves increased nitrogen metabolism in both partners, enhanced detoxification of blood waste, and activation of egg development pathways. These changes improve assimilation of blood proteins essential for egg production. Together, our results illustrate how physiological coupling during reproduction, combined with mother-biased transmission, can generate mutualistic traits within an interaction that also retains parasitic features, blurring the boundary between parasitism and mutualism.
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