Abstract
Chironomids (non-biting midges) are the most widely dispersed freshwater insects. Females deposit egg masses at the water’s edge, each egg mass contains hundreds of eggs embedded in a gelatinous matrix. They undergo complete metamorphosis of four life stages: eggs, larvae, pupae, and adults. Non O1/O139 serogroups of V. cholerae inhabit all the four life stages of chironomids. haemagglutinin protease (HAP), an extracellular enzyme of V. cholerae, degrades the gelatinous matrix of chironomid egg masses and prevents the eggs from hatching. Chironomid populations and the V. cholerae in their egg masses were found to exhibit host–pathogen population dynamics. Quorum-sensing signals, which are known to commonly establish a successful infection in pathogenic bacteria, repress the cholera toxin expression in V. cholerae and upregulate HAP production. Thus, HAP regulation by quorum sensing should be understood with regard to the bacterial role in chironomids rather than humans. Further research is needed to understand the role of cholera toxin in the environmental existence of V. cholerae. Other endogenous bacterial species that inhabit the egg mass may also use the degraded gelatinous matrix as a nutritive source for their growth. By doing so, they probably control the population levels of V. cholerae in the egg mass. Vice versa, V. cholerae support the maintenance of other endogenic bacteria in the egg mass by secreting HAP. The interaction between V. cholerae and chironomids is probably a complicated mutualistic relationship rather than a simple host–pathogen interaction.
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I thank Prof. Simcha Lev-Yadun for his helpful comments on an earlier draft of the manuscript.
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Halpern, M. (2012). Chironomids and Vibrio cholerae . In: Rosenberg, E., Gophna, U. (eds) Beneficial Microorganisms in Multicellular Life Forms. Springer, Berlin, Heidelberg. https://doi.org/10.1007/978-3-642-21680-0_3
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