Journal Article

Alteration of the unfolded protein response modifies neurodegeneration in a mouse model of Marinesco–Sjögren syndrome

Lihong Zhao, Christine Rosales, Kevin Seburn, David Ron and Susan L. Ackerman

in Human Molecular Genetics

Volume 19, issue 1, pages 25-35
Published in print January 2010 | ISSN: 0964-6906
Published online October 2009 | e-ISSN: 1460-2083 | DOI: http://dx.doi.org/10.1093/hmg/ddp464
Alteration of the unfolded protein response modifies neurodegeneration in a mouse model of Marinesco–Sjögren syndrome

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Endoplasmic reticulum (ER) stress has been linked to the onset and progression of many diseases. SIL1 is an adenine nucleotide exchange factor of the essential ER lumen chaperone HSPA5/BiP that senses ER stress and is involved in protein folding. Mutations in the Sil1 gene have been associated with Marinesco–Sjögren syndrome, hallmarks of which include ataxia and cerebellar atrophy. We have previously shown that loss of SIL1 function in mouse results in ER stress, ubiquitylated protein inclusions, and degeneration of specific Purkinje cells in the cerebellum. Here, we report that overexpression of HYOU1/ORP150, an exchange factor that works in parallel to SIL1, prevents ER stress and rescues neurodegeneration in Sil1−/− mice, whereas decreasing expression of HYOU1 exacerbates these phenotypes. In addition, loss of DNAJC3/p58IPK, a co-chaperone that promotes ATP hydrolysis by BiP, ameliorates ER stress and neurodegeneration in Sil1−/− mice. These findings suggest that alterations in the nucleotide exchange cycle of BiP cause ER stress and neurodegeneration in Sil1-deficient mice. Our results present the first evidence of important genetic modifiers of Marinesco–Sjögren syndrome, and provide additional pathways for therapeutic intervention for this, and other ER stress-induced, diseases.

Journal Article.  6028 words.  Illustrated.

Subjects: Genetics and Genomics

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