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Cyclic di-AMP (c-di-AMP) is a bacterial signaling nucleotide synthesized by several human pathogens. This widespread and specific bacterial product is recognized by infected host cells to trigger an innate immune response. Detection of c-di-AMP in the host cytosol leads primarily to the induction of type I interferon via the STING-cGAS signaling axis, while being also entangled in the activation of the NF-κB pathway. During their long-standing interaction, host and pathogens have co-evolved to control c-di-AMP activation of innate immunity. On the bacterial side, the quantity of c-di-AMP released inside cells allows to manipulate the host response to exacerbate infection by avoiding immune recognition or, at the opposite, by overloading the STING-cGAS pathway. Copyright © 2017 Elsevier Ltd. All rights reserved.


Laura Devaux, Pierre-Alexandre Kaminski, Patrick Trieu-Cuot, Arnaud Firon. Cyclic di-AMP in host-pathogen interactions. Current opinion in microbiology. 2018 Feb;41:21-28

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PMID: 29169058

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