Two Loci, Tmevp2 and Tmevp3, Located on the Telomeric Region of Chromosome 10, Control the Persistence of Theiler's Virus in the Central Nervous System of Mice

Corresponding author: M. Brahic, Unité des Virus Lents, Institut Pasteur, 28, rue du Dr. Roux, 75724 Paris Cedex 15, France., mbrahic{at}pasteur.fr (E-mail)

Communicating editor: N. A. JENKINS

Theiler's virus persistently infects the white matter of the spinal cord in susceptible strains of mice. This infection is associated with inflammation and primary demyelination and is studied as a model of multiple sclerosis. The H-2D gene is the major gene controlling viral persistence. However, the SJL/J strain is more susceptible than predicted by its H-2^s haplotype. An (SJL/J x B10.S)F₁ x B10.S backcross was analyzed, and one quantitative trait locus (QTL) was located in the telomeric region of chromosome 10 close to the Ifng locus. Another one was tentatively mapped to the telomeric region of chromosome 18, close to the Mbp locus. We now report the study of 14 congenic lines that carry different segments of these two chromosomes. Although the presence of a QTL on chromosome 18 was not confirmed, two loci controlling viral persistence were identified on chromosome 10 and named Tmevp2 and Tmevp3. Furthermore, the Ifng gene was excluded from the regions containing Tmevp2 and Tmevp3. Analysis of the mode of inheritance of Tmevp2 and Tmevp3 identified an effect of sex, with males being more infected than females.

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