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Ribosome inactivating proteins (RIPs) are RNA  N -glycosidases that depurinate a specific adenine residue in the conserved sarcin/ricin loop of 28S rRNA. These enzymes are widely distributed among plants and their presence has also been confirmed in several bacterial species. Recently, we reported for the first time  in silico  evidence of RIP encoding genes in metazoans, in two closely related species of insects:  Aedes aegypti  and  Culex quinquefasciatus . Here, we have experimentally confirmed the presence of these genes in mosquitoes and attempted to unveil their evolutionary history. A detailed study was conducted, including evaluation of taxonomic distribution, phylogenetic inferences and microsynteny analyses, indicating that mosquito RIP genes derived from a single Horizontal Gene Transfer (HGT) event, probably from a cyanobacterial donor species. Moreover, evolutionary analyses show that, after the HGT event, these genes evolved under purifying selection, strongly suggesting they play functional roles in these organisms.

Metazoan Ribosome Inactivating Protein encoding genes acquired by Horizontal Gene Transfer