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Department of Pediatrics, Gifu University School of Medicine, Japan.
The molecular basis of X-linked adrenoleukodystrophy (ALD) was investigated. Six (A to 50) fragments of cDNA for ALD protein (Mosser et al. Nature 361: 726-730, 1993) from an adult patient with adrenomyeloneuropathy were amplified by PCR and mutations were screened by Mutation Detection Enhancement gel electrophoresis. A single base substitution (2154 C-->T, which resulted in the formation of a termination codon for glutamine (Q590STOP) and deletes Pst I site (CTGCAG-->CTGTAG), was detected. Eight other ALD patients did not have this mutation. A family study revealed the presence of both the mutant and normal alleles in the mother, a sister and a niece, indicating that these individuals were carriers. A nephew with childhood ALD who died 10 years earlier had the same mutant allele as detected by Pst I restriction assay. This report is the first description of a mutant allele for ALD, at the cDNA level, and presents confirmatory evidence of ALD protein as the primary etiology of ALD.
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