Severity of tuberculosis in mice is linked to distal chromosome 3 and proximal chromosome 9.
Genetic factors play a role in host response to infection with Mycobacterium tuberculosis, the number one infectious killer worldwide. Mice of the inbred strains I/St and A/Sn show significant differences in disease severity after intravenous injection of a lethal dose of the virulent human isolate M. tuberculosis H37Rv. Following challenge with H37Rv, only I/St mice have rapid body weight loss and short survival times. A genome wide analysis for linkage with body weight after M. tuberculosis H37Rv infection was done in (A/SnxI/St)F1xI/St mice. Among females, quantitative trait loci (QTLs) on chromosomes 9 and 3 were significantly linked to postinfection body weight (logarithm of the odds ratio [LOD] scores of 6.68 and 3.92, respectively). Suggestive linkages were found for QTLs on chromosomes 8 and 17 (LOD scores of 3.01 and 2.95, respectively). For males, QTLs on chromosomes 5 and 10 showed suggestive linkages (LOD scores of 3.03 and 2.31, respectively). These linkages can be used to identify candidate regions for tuberculosis susceptibility loci in the human genome.
Lavebratt
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C
Neurogenetics Unit, Center for Molecular Medicine, Karolinska Hospital, 171 76 Stockholm, Sweden. catharina.lavebratt@cmm.ki.se
Apt
A S
AS
Nikonenko
B V
BV
Schalling
M
M
Schurr
E
E
D000818:Animals; D002678:Chimera; D002875:Chromosomes; D020022:Genetic Predisposition to Disease; D008126:Lod Score; D051379:Mice / Q000235:genetics*; D008815:Mice, Inbred Strains; D014397:Tuberculosis, Pulmonary / Q000235:genetics*; D015431:Weight Loss / Q000235:genetics*