Dissecting the Structure and Interactions of the MRN Complex in Trypanosoma brucei Genome Maintenance

Description du projet

Les mécanismes de réparation de l’ADN chez les trypanosomes

La trypanosomiase africaine, communément appelée «maladie du sommeil», est une maladie parasitaire transmise par la mouche tsé-tsé. Causée par le parasite Trypanosoma brucei, elle touche les humains et les animaux dans toute l’Afrique subsaharienne. Ce parasite échappe au système immunitaire en modifiant en permanence les protéines présentées à sa surface, un processus lié aux mécanismes de réparation de l’ADN. Soutenu par le programme Actions Marie Skłodowska-Curie, le projet MIDAS vise à étudier un complexe clé de réparation de l’ADN chez T. brucei, qui répare les cassures double brin de l’ADN et contribue à l’évasion immunitaire. Son objectif est de déterminer la structure et le réseau d’interactions de ce complexe et de mettre en lumière des mécanismes spécifiques au parasite. Les résultats du projet pourraient apporter des éclairages décisifs sur la manière dont les trypanosomes africains échappent au système immunitaire de l’hôte.

Objectif

Double-strand breaks (DSBs) are among the most dangerous DNA lesions, and their repair is essential for genome stability. Central to this process is the MRN complex (MRE11–RAD50–NBS1), which senses breaks, processes DNA ends, activates ATM, and coordinates pathway choice between homologous recombination (HR), non-homologous end joining (NHEJ), and alternative end-joining (MMEJ). At chromosomal breaks MRN promotes resection and repair, while at telomeres its activity is restrained to avoid inappropriate repair. In Trypanosoma brucei, the parasite responsible for human and animal African trypanosomiasis, DSB repair is crucial not only for genome integrity but also for antigenic variation. This process enables immune evasion by switching expression of variant surface glycoprotein (VSG) genes at subtelomeres. While MRN is required for HR at intrachromosomal breaks and restrains recombination at VSG sites, its structural features, regulation, and interaction partners in T. brucei remain unexplored. No high-resolution structure exists, and its divergence limits computational predictions. This project will elucidate how the T. brucei MRN complex regulates DSB repair in different genomic contexts, intrachromosomal and subtelomeric loci. We will (i) determine its structure by cryo-EM with ATP and DNA, defining domain organization, DNA/nucleotide contacts, and nuclease regulation; (ii) validate structural determinants through mutagenesis of RAD50–MRE11 and nuclease interfaces, assessing stability, ATPase, and nuclease activity; and (iii) identify MRN interactors in vivo using proximity labeling at intrachromosomal and subtelomeric DSBs. By combining structural and functional approaches, this work will reveal conserved and parasite-specific mechanisms of MRN regulation, clarify its role in genome stability and antigenic variation, and provide insights into DNA repair in a divergent eukaryote of medical importance.