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Mosquitoes have an efficient cellular innate immune response that includes phagocytosis of microbial pathogens and encapsulation of metozoan parasites. In this study, we describe a novel lectin in the mosquito, Armigeres subalbatus (aslectin or AL-1). The 1.27 kb cDNA clone for the AL-1 gene (AL-1) encodes a 279 deduced amino acid sequence that contains a C-terminal fibrinogen-like domain. AL-1 is transcribed in all life stages. AL-1 mainly exists in the haemolymph of adult female mosquitoes, and is upregulated following both Escherichia coli and Micrococcus luteus challenge. AL-1 specifically recognizes N-acetyl-d-glucosamine and is able to bind both E. coli and M. luteus. These results suggest that AL-1 might function as a pattern recognition receptor in the immune response in Ar. subalbatus.
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Wang et al. (2004) studied this question.
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