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The gene disrupted in Marinesco-Sjögren syndrome encodes SIL1, an HSPA5 cochaperone

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Abstract

We identified the gene underlying Marinesco-Sjögren syndrome, which is characterized by cerebellar ataxia, progressive myopathy and cataracts. We identified four disease-associated, predicted loss-of-function mutations in SIL1, which encodes a nucleotide exchange factor for the heat-shock protein 70 (HSP70) chaperone HSPA5. These data, together with the similar spatial and temporal patterns of tissue expression of Sil1 and Hspa5, suggest that disturbed SIL1-HSPA5 interaction and protein folding is the primary pathology in Marinesco-Sjögren syndrome.

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Figure 1: SIL1 structure, MSS-associated mutations and variants with their expression in individuals with MSS.

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Acknowledgements

We thank the affected individuals and their families for collaboration; S. Lindh for collecting the samples; H. Olanne, T. Jokinen, T. Järvinen, T.-T. Toivonen and P. Hakala for technical assistance; and M. Heikinheimo, T. Kivelä, A. Hirvasniemi, R. Herva, A. Vihola, J. Kallijärvi and E. Anttonen for help and advice. This study was supported by the Folkhälsan Research Foundation and the Academy of Finland (Finnish Centre of Excellence Programme 2000–2005). A.-K.A. and R.H.H. are fellows of the Helsinki Biomedical Graduate School.

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Correspondence to Anna-Elina Lehesjoki.

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Supplementary information

Supplementary Fig. 1

The main clinical findings in MSS. (PDF 755 kb)

Supplementary Fig. 2

Pedigrees of the eight families studied showing microsatellite marker genotypes in the linked region on chromosome 5q31. (PDF 45 kb)

Supplementary Fig. 3

Chromatograms showing SIL1 mutations in MSS patients with respective controls. (PDF 126 kb)

Supplementary Fig. 4

Analysis of SIL1 tissue expression. (PDF 217 kb)

Supplementary Fig. 5

Tissue expression of Sil1 and Hspa5 in mouse (PDF 1066 kb)

Supplementary Table 1

Clinical features of the patients. (PDF 52 kb)

Supplementary Methods (PDF 102 kb)

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Anttonen, AK., Mahjneh, I., Hämäläinen, R. et al. The gene disrupted in Marinesco-Sjögren syndrome encodes SIL1, an HSPA5 cochaperone. Nat Genet 37, 1309–1311 (2005). https://doi.org/10.1038/ng1677

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