CRISPRi screen and whole genome sequencing
The Type VI Secretion System (T6SS) is a molecular nanomachine that injects toxic effector proteins into the environment or neighbouring cells, playing an important role in interbacterial competition and host antagonism during infection. Pseudomonas aeruginosa encodes three different T6SSs. The H1-T6SS delivers toxins into aggressive bacteria in response to attacks mediated by their own T6SS. This suggests that P. aeruginosa has the ability to survive T6SS assaults. However, the resistance mechanisms are poorly characterized. In this work, we performed a CRISPRi screen to identify pathways involved in resistance to T6SS effectors of Acinetobacter baylyi and Vibrio cholerae.