 |
Journal articles
Transgenic Anopheles stephensi coexpressing single-chain antibodies resist Plasmodium falciparum development
Abstract : Anopheles stephensi mosquitoes expressing m1C3, m4B7, or m2A10 single-chain antibodies (scFvs) have significantly lower levels of infection compared to controls when challenged with Plasmodium falciparum, a human malaria pathogen. These scFvs are derived from antibodies specific to a parasite chitinase, the 25 kDa protein and the circumsporozoite protein, respectively. Transgenes comprising m2A10 in combination with either m1C3 or m4B7 were inserted into previously-characterized mosquito chromosomal "docking" sites using site-specific recombination. Transgene expression was evaluated at four different genomic locations and a docking site that permitted tissue- and sex-specific expression was researched further. Fitness studies of docking site and dual scFv transgene strains detected only one significant fitness cost: adult docking-site males displayed a late-onset reduction in survival. The m4B7/m2A10 mosquitoes challenged with P. falciparum had few or no sporozoites, the parasite stage infective to humans, in three of four experiments. No sporozoites were detected in m1C3/m2A10 mosquitoes in challenge experiments when both genes were induced at developmentally relevant times. These studies support the conclusion that expression of a single copy of a dual scFv transgene can completely inhibit parasite development without imposing a fitness cost on the mosquito.
Cited literature [34 references]
https://hal-pasteur.archives-ouvertes.fr/pasteur-02552282
Contributor : Agnes Zettor <>
Submitted on : Thursday, April 23, 2020 - 2:34:08 PM
Last modification on : Thursday, June 3, 2021 - 6:34:02 PM
Contributor : Agnes Zettor <>
Submitted on : Thursday, April 23, 2020 - 2:34:08 PM
Last modification on : Thursday, June 3, 2021 - 6:34:02 PM
Links full text
