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DYT1 dystonia is a debilitating neurological disease characterized by involuntary twisting movements. The disease is caused by an in-frame deletion (GAG, "ΔE") mutation in the TOR1A gene that encodes the torsinA protein. Intriguingly, only 30% of mutation carriers exhibit motor symptoms despite the fact that functional brain imaging studies show abnormal brain metabolism in all carriers. Because genetic modifiers may be a determinant of this reduced penetrance, we examined the genetic contribution of three different inbred strains of mice on the DYT1 mutation in animals that are homozygous (Tor1a(ΔE/ΔE)) or heterozygous (Tor1a(ΔE/+); disease state) for the disease-causing ΔE mutation. We find that the DBA/2J, C57BL/6J, and CD1-ICR contribution of genes significantly alter lifespan in Tor1a(ΔE/ΔE) mice, which die during the first few days of life on the 129S6/SvEvTac (129) background. The C57BL/6J (B6) strain significantly decreases life expectancy of Tor1a(ΔE/ΔE) animals but, like 129S6/SvEvTac Tor1a(ΔE/+) mice, congenic C57BL/6J Tor1a(ΔE/+) mice do not exhibit any motor abnormalities. In contrast, the DBA/2J (D2) strain significantly increases life expectancy. This effect was not present in congenic DBA/2J Tor1a(ΔE/ΔE) mice, indicating that the extended lifespan of F2 129/D2 mice was due to a combination of homozygous and heterozygous allelic effects. Our observations suggest that genetic modifiers may alter the penetrance of the ΔE mutation, and that mapping these modifiers may provide fresh insight into the torsinA molecular pathway.
Pubmed ID: 22393392
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Founded in 1976, the Dystonia Medical Research Foundation (DMRF) is a 501(c)3 organization dedicated to serving all people with dystonia and their families. Since its inception, the DMRF has grown from a small family-based foundation into a dynamic membership-driven organization led by a Board of Directors and network of volunteers with personal connections to dystonia. Because dystonia hits so close to home for our directors and volunteers, the DMRF leadership is motivated by an unrelenting drive to find a cure and an unwavering commitment to serving people affected by dystonia. Dystonia Medical Research Foundation (DMRF) prides itself on a long history of supporting dystonia research. Always the primary goal of the DMRF, research has led to a better understanding of dystonia as well as to breakthroughs in genetics and therapeutics.The funding which researchers obtain from the DMRF usually serves as seed money before generating even greater funding from the National Institutes of Health.Beyond the funding of research, the scientific program of the DMRF is multi-faceted, encompassing workshops, a residency elective program, and international medical symposiums, all to further the understanding of dystonia.
View all literature mentionsMus musculus with name C57BL/6J from IMSR.
View all literature mentionsMus musculus with name DBA/2J from IMSR.
View all literature mentions