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Improved survival and overt "dystonic" symptoms in a torsinA hypofunction mouse model.

Behav Brain Res. 2020 Mar 02;381:112451. Epub 2019 Dec 28
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摘要


DYT1 dystonia is an inherited movement disorder without obvious neurodegeneration. Multiple mutant mouse models exhibit motor deficits without overt "dystonic" symptoms and neurodegeneration. However, some mouse models do. Among the later models, the N-CKO mouse model, which has a heterozygous Tor1a/Dyt1 knockout (KO) in one allele and Nestin-cre-mediated conditional KO in the other, exhibits a severe lack of weight gain, neurodegeneration, overt "dystonic" symptoms, such as overt leg extension, weak walking, twisted hindpaw and stiff hindlimb, and complete infantile lethality. However, it is not clear if the overt dystonic symptoms were caused by the neurodegeneration in the dying N-CKO mice. Here, the effects of improved maternal care and nutrition during early life on the symptoms in N-CKO mice were analyzed by culling the litter and providing wet food to examine whether the overt dystonic symptoms and severe lack of weight gain are caused by malnutrition-related neurodegeneration. Although the N-CKO mice in this study replicated the severe lack of weight gain and overt "dystonic" symptoms during the lactation period regardless of culling at postnatal day zero or later, there was no significant difference in the brain astrocytes and apoptosis between the N-CKO and control mice. Moreover, more than half of the N-CKO mice with culling survived past the lactation period. The surviving adult N-CKO mice did not display overt "dystonic" symptoms, and in addition they still exhibited small body weight. The results suggest that the overt "dystonic" symptoms in the N-CKO mice were independent of prominent neurodegeneration, which negates the role of neurodegeneration in the pathogenesis of DYT1 dystonia. Copyright © 2019 Elsevier B.V. All rights reserved.

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