Wb14 of Wuchereria bancrofti, an orthologue of Brugia malayi SXP-1 and W. bancrofti SXP-1, was amplified from genomic DNA of W. bancrofti microfilaria collected from four distant geographical locations in India viz., Vellore, Bhubaneshwar, Pondicherry and Sevagram. The gene was sub-cloned in a prokaryotic vector pRSET and expressed in Escherichia coli as a truncated protein (approximately 23kDa). The nucleotide sequence of the gene is 98% similar to that of WbSXP-1 and is found to be intron-less. However, the analysis and comparison of the derived amino acid sequence with WbSXP-1 showed that Wb14 is truncated at amino acid position 153. The distribution of the two genes in the studied four geographical locations indicated that WbSXP-1 is prevalent only in parasite samples from Sevagram while Wb14 is present in parasites from all the other locations. Only a limited polymorphism was observed in both the genes among the parasites from different geographical locations.

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