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Mutational analysis of patients with X‐linked adrenoleukodystrophy
Author(s) -
Kok Fernando,
Neumann Sylvia,
Sarde ClaudeOlivier,
Zheng Siqun,
Wu KueiHua,
Wei HeMing,
Bergin James,
Watkins Paul A.,
Gould Stephen,
Sack George,
Moser Hugo,
Mandel JeanLouis,
Smith Kirby D.
Publication year - 1995
Publication title -
human mutation
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.981
H-Index - 162
eISSN - 1098-1004
pISSN - 1059-7794
DOI - 10.1002/humu.1380060203
Subject(s) - biology , adrenoleukodystrophy , genetics , gene , peroxisome
Adrenoleukodystrophy (ALD) is an X‐linked neurodegenerative disorder characterized by elevated very long chain fatty acid (VLCFA) levels, reduced activity of peroxisomal VLCFA‐CoA ligase, and variable phenotypic expression. A putative gene for ALD was recently identified and surprisingly encodes a protein (ALDP) that belongs to a family of transmembrane transporters regulated or activated by ATP (the ABC proteins). We have examined genomic DNA from ALD probands for mutations in the putative ALD gene. We detected large deletions of the carboxyl‐terminal portion of the gene in 4 of 112 probands. Twenty‐five of the ALD probands whose ALD genes appeared normal by Southern blot analysis were surveyed for mutations by Single Strand Conformation Polymorphism (SSCP) procedures and DNA sequence analysis. SSCP variants were detected in 22 probands and none in 60 X‐chromosomes from normal individuals. Mutations were detected in all of the ALD probands. The mutations were distributed throughout the gene and did not corrate with phenotype. Approximately half were non‐recurrent missense mutations of which 64% occurred in CpG dinucleotides. There was a cluster of frameshift mutations in a small region of exon 5, including an identical AG deletion in 7 unrelated probands. These data strongly support the supposition that mutations in the putative ALD gene result in ALD. © 1995 Wiley‐Liss, Inc.