Abstract
Resistance to the establishment of intestinal Entamoeba histolytica infection is dependent on the inbred mouse strain. In this work we used the inbred strains B6 (resistant), CBA (susceptible), B6CBAF1 and a backcross of B6CBAF1 to CBA to further examine the genetic basis of resistance. Mouse genotype was assessed with single nucleotide polymorphism and microsatellite markers and infection assessed by culture 9 days after intracecal E. histolytica challenge. The backcross population showed a male predisposition to culture positivity (P<0.002). F1 genotype at two loci on chromosomes 1 and 2 exhibited suggestive linkage with resistance to infection (P=0.0007 and 0.0200). Additional suggestive quantitative trait locus were observed on chromosomes 1, 9 and 13 for cecal parasite antigen load and histologic evidence of inflammation. Infection in C3H × B6 recombinant inbred mice supported the mapping data. Candidate B6 genes on chromosomes 1 and 2 were examined by microarray analysis of epithelial tissues from B6 vs CBA mice. This work shows a male predisposition to intestinal amebiasis and suggests that relatively few B6 loci can confer resistance in inbred mice. Future identification of regional candidate genes has implications for understanding the human variability to amebic infection.
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Acknowledgements
This work was supported by research grants from NIH (AI071373, AI052444), the Crohn's and Colitis Foundation of America, the Commonwealth of Virginia Technology Research Fund. SH was supported by a grant-in-Aid for Scientific Research from the Ministry of Education, Science, Technology, Sports and Culture of Japan and by the Mochida Memorial Foundation for Medical and Pharmaceutical Research. We thank Anna Velcich for provision of the Muc2 KO mice, Craig Coopersmith for the FVB mice, William A Petri Jr, for helpful advice and David Lyerly, Techlab, for the E. histolytica II ELISA kits. We acknowledge the UVA Research Histology Core of the Center for Research in Reproduction and thank Sharon Hoang of the UVA Digestive Health Center of Excellence Histology Core for immunohistochemistry support, whose work was partially supported by the Morphology/Imaging Core of the National Institutes of Health-funded Silvio O Conte Digestive Diseases Research Center (P30DK56703).
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Hamano, S., Becker, S., Asgharpour, A. et al. Gender and genetic control of resistance to intestinal amebiasis in inbred mice. Genes Immun 9, 452–461 (2008). https://doi.org/10.1038/gene.2008.37
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DOI: https://doi.org/10.1038/gene.2008.37