Testing the efficacy of RNA interference in Haemonchus contortus

Geldhof, P., Murray, L., Couthier, A., Gilleard, J. S., McLauchlan, G., Knox, D. P. and Britton, C. (2006) Testing the efficacy of RNA interference in Haemonchus contortus. International Journal for Parasitology, 36(7), pp. 801-810. (doi: 10.1016/j.ijpara.2005.12.004) (PMID:16469321)

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RNA interference (RNAi) is widely used in Caenorhabditis elegans to identify gene function and has been adapted as a high throughput screening method to identify genes involved in essential processes. We have been examining whether RNAi could also be used on the strongylid parasitic nematode Haemonchus contortus to study gene function. Eleven genes were targeted in L1 and exsheathed L3 H. contortus larvae with RNAi methodologies which have been shown to be effective in C. elegans and parasitic nematodes—feeding, soaking and electroporation. Reverse transcriptase-PCR and, where possible, protein assays were carried out to examine decreases in mRNA and protein levels. RNAi soaking in dsRNA to beta-tubulin and sec-23, a gene involved in vesicle transport, resulted in specific decreases in mRNA levels in exsheathed L3 larvae. No signs of specific decreases in expression levels were observed for the other nine genes tested. Following electroporation of dsRNA in L1 stage larvae, significant decreases were observed for two out of four genes tested. These findings suggest that the RNAi pathway is functional in H. contortus and that, under certain conditions, it is possible to suppress gene expression by RNAi. However, it only works on a limited number of genes and in some cases the effect is small and difficult to reproduce. This indicates that the RNAi approaches established for C. elegans and other nematodes have limited efficacy in H. contortus. This may reflect differences between nematode species in dsRNA uptake and transport into cells and between cells.

Item Type:Articles
Glasgow Author(s) Enlighten ID:Murray, Ms Linda and Gilleard, Professor John and McLauchlan, Mr Gerard and Britton, Professor Collette and Geldhof, Prof Peter
Authors: Geldhof, P., Murray, L., Couthier, A., Gilleard, J. S., McLauchlan, G., Knox, D. P., and Britton, C.
College/School:College of Medical Veterinary and Life Sciences
College of Medical Veterinary and Life Sciences > School of Infection & Immunity
Journal Name:International Journal for Parasitology
ISSN (Online):1879-0135
Published Online:18 January 2006

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Project CodeAward NoProject NamePrincipal InvestigatorFunder's NameFunder RefLead Dept
351421Adaptation of caenorhabditis elegans technology to identification and expression of parasite target genesCollette BrittonBiotechnology and Biological Sciences Research Council (BBSRC)S20387Infection Immunity and Inflammation Life Sciences