title: Enhanced egg-induced immunopathology correlates with high IFN-gamma in murine schistosomiasis: identification of two epistatic genetic intervals.
abstract: The genetic basis of dissimilar immunopathology development among mouse strains infected with Schistosoma mansoni is not known. We performed a multipoint parametric linkage analysis on a cohort of F(2) mice, offspring of brother-sister mating between (high pathology CBA x low pathology BL/6)F(1) mice, to examine whether the observed differences in the type of immune response or the extent of hepatic immunopathology are linked to any particular genomic intervals. The F(2) mice exhibited cytokine responses and immunopathologies that revealed a statistically significant correlation between prominent egg Ag-stimulated IFN-gamma production by mesenteric lymph node cells and hepatic egg granuloma size. Increased IFN-gamma production showed suggestive linkage to a dominant CBA locus on chromosome 1 and a recessive CBA locus on chromosome 5; significantly, there was an epistatic interaction between the two IFN-gamma loci. An additional locus with suggestive linkage to granuloma formation and a CBA-recessive mode of inheritance was mapped to centromeric chromosome 13. Our analysis identified the first three genetic regions that appear to influence the immunopathology in murine schistosomiasis; however, further congenic dissection studies will furnish a more precise understanding of the genetic control of this disease.
authors.affiliation: Department of Pathology, Tufts University School of Medicine, 150 Harrison Avenue, Boston, MA 02111, USA.
authors.forename: Laura I
authors.initials: LI
authors.lastname: Rutitzky
authors.forename: Hector J
authors.initials: HJ
authors.lastname: Hernandez
authors.forename: Young-Sun
authors.initials: YS
authors.lastname: Yim
authors.forename: David E
authors.initials: DE
authors.lastname: Ricklan
authors.forename: Eduardo
authors.initials: E
authors.lastname: Finger
authors.forename: Chandra
authors.initials: C
authors.lastname: Mohan
authors.forename: Inga
authors.initials: I
authors.lastname: Peter
authors.forename: Edward K
authors.initials: EK
authors.lastname: Wakeland
authors.forename: Miguel J
authors.initials: MJ
authors.lastname: Stadecker
mesh_terms: D000818:Animals; D002874:Chromosome Mapping; D004195:Disease Models, Animal; D004843:Epistasis, Genetic; D005260:Female; D008040:Genetic Linkage; D006099:Granuloma / Q000473:pathology; D007371:Interferon-gamma / Q000096:biosynthesis* / Q000276:immunology; D008109:Liver Diseases, Parasitic / Q000473:pathology; D008297:Male; D051379:Mice; D010063:Ovum / Q000276:immunology*; D016133:Polymerase Chain Reaction; D012552:Schistosomiasis / Q000235:genetics*; D013045:Species Specificity
chemical_list: D007371:Interferon-gamma