Polymorphism associated with the Schistosoma mansoni tetraspanin-2 gene

[Display omitted] ► Polymorphism of the tetraspanin-2 gene of Schistosoma mansoni was investigated. ► Twenty genetically unique S. mansoni field isolates were identified. ► Tetraspanin-2 genes and transcripts from these isolates were cloned and sequenced. ► There are relatively low levels of polymorphism in the gene investigated. ► Tetraspanin-2 retains its potential as an anti-schistosomal vaccine. A vaccine against schistosomiasis would contribute significantly to reducing the 3–70 million disability-adjusted life years lost annually to the disease. Towards this end, inoculation with the large extracellular loop (EC-2) of Schistosoma mansoni tetraspanin-2 protein (Sm-TSP-2) has proved effective in reducing worm and egg burdens in S. mansoni-infected mice. The EC-2 loop of Schistosoma japonicum TSP-2, however, has been found to be highly polymorphic, perhaps diminishing the likelihood that this antigen can be used for vaccination against this species. Here, we examine polymorphism of the EC-2 of Sm-TSP-2 in genetically unique worms derived from six individuals from Kisumu, Kenya.