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A clinical and genetic study of SPG31 in Japan

羽田 貴礼 山梨大学 DOI:info:doi/10.34429/00005210

2022.09.27

概要

SPG31 is an autosomal dominant hereditary spastic paraplegia caused by pathogenic variants in the receptor expression-enhancing protein 1 (REEP1) gene. We analyzed 488 DNA samples from unrelated HSP patients collected by Japan Spastic Paraplegia Research Consortium and found 15 Japanese SPG31 families. We investigated each family and found a total of 25 individuals with REEP1 variants (comprising 22 patients and three asymptomatic carriers). Fourteen REEP1 variants (five missense, three nonsense, four frameshift, one splice site, and one large deletion) including 11 novel ones were detected. Seventy percent of the patients (14 of 20) showed a pure form and the others (6 of 20) showed a complicated form with peripheral neuropathy. Fifty percent of the patients had neurological symptoms before the age of 10 and 20% of them at age 41–50. The mean age of onset was 19.6 ± 18.7 (from 5 to 67, n = 15) years for males and 32.8 ± 24.7 (from 4 to 60, n = 5) years for females. Although the difference was not statistically significant (p = 0.38, Mann–Whitney U test), males tended to have an earlier age of onset. Moreover, all three asymptomatic carriers were female. We investigated additional factors as to phenotypic appearance in one family with apparent intrafamilial variability in age at onset and clinical severity, but no additional factors including gene variants could be found. This is the first report of clinical and genetic findings of SPG31 in Japan, which may lead to further studies of the genotype–phenotype correlation of SPG31.

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参考文献

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