New insights into the FLPergic complements of parasitic nematodes: Informing deorphanisation approaches.

FMRFamide-like peptide (FLP) receptors are appealing as putative anthelmintic targets. To date, 31 -encoding genes have been identified in and thirteen FLP-activated G-protein coupled receptors (FLP-GPCRs) have been reported. The lack of knowledge on FLPs and FLP-GPCRs in parasites impedes their functional characterisation and chemotherapeutic exploitation. Using homology-based BLAST searches and phylogenetic analyses this study describes the identification of putative and -GPCR gene homologues in 17 nematode parasites providing the first pan-phylum genome-based overview of the FLPergic complement. These data will facilitate FLP-receptor deorphanisation efforts in the quest for novel control targets for nematode parasites.