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By
From the The Walter and Eliza Hall Institute of Medical Research, Victoria 3050, Australia
In Leishmaniasis, as in many infectious diseases, clinical manifestations are determined by the
interaction between the genetics of the host and of the parasite. Here we describe studies mapping two loci controlling resistance to murine cutaneous leishmaniasis. Mice infected with
L. major show marked genetic differences in disease manifestations: BALB/c mice are susceptible, exhibiting enlarging lesions that progress to systemic disease and death, whereas C57BL/6
are resistant, developing small, self-healing lesions. F2 animals from a C57BL/6 × BALB/c
cross showed a continuous distribution of lesion score. Quantitative trait loci (QTL) have been
mapped after a non-parametric QTL analysis on a genome-wide scan on 199 animals. QTLs
identified were confirmed in a second cross of 271 animals. Linkage was confirmed to a chromosome 9 locus (D9Mit67-D9Mit71) and to a region including the H2 locus on chromosome
17. These have been named lmr2 and lmr1, respectively.
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