Journal Article

Targeting the tsetse-trypanosome interplay using genetically engineered Sodalis glossinidius

De Baetselier, Patrick, Caljon, Guy, De Vooght, Linda, Stijlemans, Benoît, Hussain, Shahid, De Ridder, Karin, Van Den Abbeele, Jan

2022

Overview

Sodalis glossinidius , a secondary bacterial symbiont of the tsetse fly, is currently considered as a potential delivery system for anti-trypanosomal components interfering with African trypanosome transmission ( i . e . paratransgenesis). Nanobodies (Nbs) have been proposed as potential candidates to target the parasite during development in the tsetse fly. In this study, we have generated an immune Nb-library and developed a panning strategy to select Nbs against the Trypanosoma brucei brucei procyclic developmental stage present in the tsetse fly midgut. Selected Nbs were expressed, purified, assessed for binding and tested for their impact on the survival and growth of in vitro cultured procyclic T . b . brucei parasites. Next, we engineered S . glossinidius to express the selected Nbs and validated their ability to block T . brucei development in the tsetse fly midgut. Genetically engineered S . glossinidius expressing Nb_88 significantly compromised parasite development in the tsetse fly midgut both at the level of infection rate and parasite load. Interestingly, expression of Nb_19 by S . glossinidius resulted in a significantly enhanced midgut establishment. These data are the first to show in situ delivery by S . glossinidius of effector molecules that can target the trypanosome-tsetse fly crosstalk, interfering with parasite development in the fly. These proof-of-principle data represent a major step forward in the development of a control strategy based on paratransgenic tsetse flies. Finally, S . glossinidius -based Nb delivery can also be applied as a powerful laboratory tool to unravel the molecular determinants of the parasite-vector association.

• Publisher: Public Library of Science,Public Library of Science (PLoS)
• Subject: African trypanosomiasis / Animals / Antibiotics / Biology and Life Sciences / Crosstalk / Developmental stages / Diptera / Enterobacteriaceae - genetics / Enterobacteriaceae - metabolism / Exocrine glands / Gene expression / Genetic aspects / Genetic engineering / Health aspects / Host-parasite relationships / Infections / Libraries / Load distribution / Medicine and Health Sciences / Midgut / Nanobodies / Panning / Parasites / Parasitic diseases / Research and Analysis Methods / Single-Domain Antibodies - metabolism / Symbiosis / Trypanosoma / Trypanosoma brucei / Trypanosoma brucei brucei - genetics / Trypanosome / Tsetse Flies - parasitology / Vectors (Biology)