ABSTRACT
Malaria is a vector borne disease, considered to be one of the most serious public health problems. The present review focused on the blocking of parasite development in mosquito vectors; one broad strategy for achieving this is Transmission Blocking Vaccines (TBV). The TBVs usually rely on immunization of vertebrate hosts with molecules derived from the vector or pathogen to reduce pathogen transmission from infected to uninfected hosts. Most of the studies on the TBVs are based on the antibodies targeted against the surface antigens of sexual stages of malaria parasite, but it is meagre to develop mosquito-based vaccine in this regard. Vector-based TBVs include surface proteins that are expressed by the mosquito midgut digestive enzymes which are induced upon blood-feeding, and receptors expressed on the epithelial line of the tissue. Many proteins are reported that can act as candidates for transmission-blocking vaccines. This review aims to summarize the vector midgut-based proteins identified till date, that can block the development and maturity of sexual stages of the parasite within mosquitoes as targets for transmission-blocking vaccine development. The TBVs intervention can block transmission of different malaria parasite species in various species of mosquitoes with future application perspective worldwide.
ABSTRACT
Malaria continues to be a life threatening infectious disease throughout the tropical region of the world.aminopeptidase N1 (APN1) is one of the best choices for developing new Malaria Transmission-blockingvaccines. In this study an attempt has been made to overview genome-wide identification of APN genes inAnopheles gambiae. A total of eighteen A. gambiae APN sequences were found that contain conserved HEXXHand GAMEN signature sequences, indicate that large numbers of APN isomers present in mosquitoes. MultipleAPN paralogs exist as a gene cluster may propose that huge synthesis of APNs is required for rapid digestion ofpeptides over a brief period. Gene structure study shows high sequence variations among them. Protein–proteininteractions show that APN1 is highly connected protein, supporting their role as hub with other five types ofAPNs involved in glutathione metabolism, act as hub protein and disruption of one of these proteins may affectthe whole pathway