Abstract
Infection of inbred mouse strains with Citrobacter rodentium represents an ideal model to reveal the genetic factors controlling host resistance to noninvasive enteric bacterial pathogens. We have chosen a positional cloning approach to identify putative gene(s) that control the known difference in survival between resistant C57BL/6J and susceptible C3H/HeJ and C3H/HeOuJ mice. Our work has identified one major locus within proximal chromosome 15 that is responsible for the marked susceptibility of both C3H strains, and we formally exclude Tlr4 from control of survival to this pathogen. We have named this new host resistance locus Cri1 (Citrobacter rodentium infection 1). The Cri1 genetic interval currently spans ∼16 Mb and it confers survival to the infection in a recessive manner. Transfer of the Cri1 locus from the surviving B6 mice into a congenic mouse with a C3Ou genetic background confirms its overall chromosomal localization and its highly significant effect on host survival. The C3Ou.B6-Cri1 mice thus produced have also enabled us to dissociate the control of mouse survival from the control of bacterial load early in the infection as well as from control of colonic hyperplasia.
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Acknowledgements
This work was supported by a team grant from the Canadian Genetic Disease Network/Gene Cure Foundation (SG and DM) and a CIHR Operating Grant MOP89817 (SG). E Diez was the recipient of a Canadian Association of Gastroenterology/Canadian Institutes of Health Research-partnered (CAG-CIHR) postdoctoral fellowship.
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Diez, E., Zhu, L., Teatero, S. et al. Identification and characterization of Cri1, a locus controlling mortality during Citrobacter rodentium infection in mice. Genes Immun 12, 280–290 (2011). https://doi.org/10.1038/gene.2010.76
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DOI: https://doi.org/10.1038/gene.2010.76
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