Abstract
In situ hybridization (ISH) is a very informative technique to present cellular distribution patterns of specific genes (e.g., mRNA and ncRNA) in tissues. The sipunculid worm Sipunculus nudus is a crucial fishery resource as it has high nutritional and medicinal values. Currently, the research on the molecular biology of Sipunculus nudus is still in its infancy. The purpose of this article is to develop a sensitive method for localizing specific mRNA in Sipunculus nudus coelomic fluid. The protocol includes detailed steps of ISH, including digoxigenin-labeled antisense and sense riboprobe preparation, coelomic fluid collection and section preparation, specific riboprobe hybridization, antibody incubation, coloration and post-coloration treatments. The representative results obtained from a successful experiment using this method are demonstrated. The protocol should be applicable to other Sipuncula species as well.
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