3'-RACE amplification of aminopeptidase N gene from Anopheles stephensi applicable in transmission blocking vaccines

ABSTRACT

Because of the lack of an effective and economical control strategy against malaria [the most devastating infectious disease in developing countries] Transmission-Blocking Vaccines [TBVs] concept has been raised in recent years, promising a more efficient way to malaria control. TBVs aim at interfering and/or blocking pathogen development within the vector, halting transmission to non-infected vertebrate host. Aminopeptidase N [APN] is one of the most potent proteins in parasite development in Anopheles malaria vectors, which is strongly co-localized with human malaria parasites in the mosquito midgut epithelium. Therefore, Aminopeptidase N is one of the best choices for a new TBV. In this study for the first time we used 3'-RACE to amplify APN gene in Anopheles stephensi [An.stephensi], a major malaria vector in Iran, Indian subcontinent up to China by using different sets of primers including exon junction, conserved and specific region primers. Full length of APN was sequenced stepwise, which could be applied in designing a new regional TBV and act as an essential component of malaria elimination program in An. stephensi distribution areas. Primers design and method modification should be set up exactly in approach based amplifications. From results we came to this conclusion that that 3'-RACE could be applied to amplified key regions which are be-yond reach