Victor J. Torres @torreslab.bsky.social · 22/02/20257/8 We hypothesized porins may not be critical during infection of an immunocompromised host (the common victim of Enterobacter infections). Indeed, porin mutants were able to cause lethal infection in a neutropenic mouse model, and in an ex vivo model of human bacteremia. 110
Victor J. Torres @torreslab.bsky.social · 22/02/20256/8 However, porin loss did promote carbapenem resistance in the ST78 isolates, an important phenomenon in multidrug-resistant Gram-negatives. 100
Victor J. Torres @torreslab.bsky.social · 22/02/20255/8 Deletion of these porin genes in two otherwise virulent isolates rendered the isolates avirulent. 100
Victor J. Torres @torreslab.bsky.social · 22/02/20254/8 These analyses suggested loss-of-function mutations in two porin-encoding genes may be the culprit. 100
Victor J. Torres @torreslab.bsky.social · 22/02/20253/8 In a mouse model of infection, only E. hormaechei sequence type 78 (ST78) caused lethal infection. In a cluster of closely related ST78 isolates, we identified an avirulent outlier that we used for comparative genomics. 100