Abstract：
:X-linked adrenoleukodystrophy (XALD), a neurological disorder caused by mutations in the peroxisomal membrane protein gene ABCD1, presents as a rapidly progressing, inflammatory cerebral demyelination (cerebral cases) or a slowly progressing, distal axonopathy (non-cerebral cases). Specific ABCD1 defects do not explain this significant phenotypic variation. Patients have increased plasma and tissue very long chain fatty acid levels and increased cellular oxidative stress and oxidative damage. Superoxide dismutase 2 (SOD2), at candidate modifier locus 6q25.3, detoxifies superoxide radicals protecting against oxidative stress and damage. We tested an SOD2 variant C47T (Ala16Val) associated with reduced enzymatic activity as a potential modifier gene of cerebral demyelinating disease by comparing 117 cerebral XALD cases with 105 non-cerebral XALD cases. The hypoactive valine allele of the variant was associated with cerebral disease under a dominant model in the full data set (p = 0.04; ORT* = 1.90, 95% CI 1.01-3.56) and the non-childhood cerebral disease subset (p = 0.03; ORT* = 2.47, 95% CI 1.08-5.61). Three tag SNPs were genotyped to test for additional SNP or haplotype associations. A common haplotype, GTAC, which included the SOD2 valine allele, was associated with cerebral disease in the full data set (p = 0.03; OR = 1.75, 95% CI 1.11-2.75) and the non-childhood cerebral disease subset (p = 0.008; OR = 2.20, 95% CI 1.27-3.83). There was no association between childhood cerebral XALD and the C47T variant or the GTAC haplotype. Thus, reduced SOD2 activity may contribute to the development of cerebral demyelination in adolescent and adult XALD patients.
journal_name
J Neuroljournal_title
Journal of neurologyauthors
Brose RD,Avramopoulos D,Smith KDdoi
10.1007/s00415-011-6371-8subject
Has Abstractpub_date
2012-07-01 00:00:00pages
1440-7issue
7eissn
0340-5354issn
1432-1459journal_volume
259pub_type
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