The Journal of Immunology, Vol 138, Issue 5 1429-1433, Copyright © 1987 by American Association of Immunologists

ARTICLES

Variations in genetic control of susceptibility to Theiler's murine encephalomyelitis virus (TMEV)-induced demyelinating disease. I. Differences between susceptible SJL/J and resistant BALB/c strains map near the T cell beta-chain constant gene on chromosome 6

RW Melvold, DM Jokinen, RL Knobler and HL Lipton

In some susceptible mouse strains, intracerebral (IC) inoculation of Theiler's murine encephalomyelitis virus (TMEV) results in a persistent infection leading to chronic demyelinating disease. Previous genetic analyses between susceptible SJL/J and resistant C57BL/6 mice indicated a role for multiple unlinked genes in the development of clinical and histopathological disease, including a major influence of the D region of the H-2 complex. In this study, genetic analysis of a different strain combination (susceptible SJL/J and resistant BALB/c) also demonstrates the involvement of multiple genes, but the H-2 genotype (H- 2s and H-2d, respectively) does not appear to contribute significantly to susceptibility differences. In both segregation studies and recombinant-inbred (R-I) analysis, clinical and histopathological disease occurs in both H-2s homozygotes and H-2d homozygotes (as well as H-2s/H-2d heterozygotes), with the actual frequency related to the proportion of non-H-2 genome from the susceptible strain. There appear to be at least two non-H-2 genes involved in differential susceptibility of SJL/J and BALB/c to TMEV-induced disease. Analysis of R-I strains generated from BALB/c and SJL/J progenitors indicates linkage of at least one of these non-H-2 genes to those encoding the constant portion of the beta-chain of the T cell receptor on chromosome 6. Many genes may actually be involved, but each strain comparison defines a different subset of these loci--only those at which the two strains in question carry "functionally" different alleles. Thus, different strain comparisons may accent the roles of different genes in resistance to the same infectious organism or disease process. In addition to the genes identified thus far, there may be yet other genes contributing to development of TMEV-induced disease, but their recognition may require analysis of still other strain combinations.

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