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Background  The nematode  Caenorhabditis elegans  is able to take up external double-stranded RNAs (dsRNAs) and mount an RNA interference response, leading to the inactivation of specific gene expression. The uptake of ingested dsRNAs into intestinal cells has been shown to require the SID-2 transmembrane protein in  C. elegans . By contrast,  C. briggsae  was shown to be naturally insensitive to ingested dsRNAs, yet could be rendered sensitive by transgenesis with the  C. elegans sid-2  gene. Here we aimed to elucidate the evolution of the susceptibility to external RNAi in the  Caenorhabditis  genus.    Principal Findings  We study the sensitivity of many new species of Caenorhabditis to ingested dsRNAs matching a conserved actin gene sequence from the nematode Oscheius tipulae. We find ample variation in the Caenorhabditis genus in the ability to mount an RNAi response. We map this sensitivity onto a phylogenetic tree, and show that sensitivity or insensitivity have evolved convergently several times. We uncover several evolutionary losses in sensitivity, which may have occurred through distinct mechanisms. We could render C. remanei and C. briggsae sensitive to ingested dsRNAs by transgenesis of the Cel-sid-2 gene. We thus provide tools for RNA interference studies in these species. We also show that transgenesis by injection is possible in many Caenorhabditis species.    Conclusions  The ability of animals to take up dsRNAs or to respond to them by gene inactivation is under rapid evolution in the  Caenorhabditis  genus. This study provides a framework and tools to use RNA interference and transgenesis in various  Caenorhabditis  species for further comparative and evolutionary studies.

Evolution of Susceptibility to Ingested Double-Stranded RNAs in Caenorhabditis Nematodes