Abstract:
:Fabry disease, an X-linked inborn error of glycosphingolipid catabolism, results from mutations in the alpha-galactosidase A gene at Xq22.1. To determine the nature and frequency of the molecular lesions causing the classical and milder variant Fabry phenotypes, and for precise carrier detection in Fabry families, the alpha-galactosidase A coding and flanking intronic sequences from 23 unrelated Fabry hemizygotes were analyzed. In patients with the classic phenotype, 16 new missense and nonsense mutations and four small exonic gene rearrangements were identified: C52S, C56F, E59K, L89R, R100K, R112H, L131P, A143P, G144V, C172Y, D244N, N272K, A288D, W81X, Q99X, Q157X, R301X, 25del1, 333del18, 358del6, and 1020del1. The R112H mutation at a CpG dinucleotide resulted in residual activity and a mild variant phenotype while the R112C lesion caused the classic disease manifestations, defining a genotype/phenotype correlation for sense and antisense mutations at the same CpG dinucleotide. In addition, two complex rearrangements, each involving two mutational events, occurred in classic hemizygotes. Both rearrangements resulted in missense mutations that did not change the reading frame. Notably, three of the deletions occurred within 11 codons in exon 2, thereby defining a 'hot-spot' for deletions. These studies revealed that most mutations in the alpha-galactosidase A gene causing Fabry disease were private, that codons 111-122 defined a deletion hot-spot, and that different substitutions of the same codon resulted in markedly different disease phenotypes.
journal_name
Hum Mol Genetjournal_title
Human molecular geneticsauthors
Eng CM,Niehaus DJ,Enriquez AL,Burgert TS,Ludman MD,Desnick RJdoi
10.1093/hmg/3.10.1795subject
Has Abstractpub_date
1994-10-01 00:00:00pages
1795-9issue
10eissn
0964-6906issn
1460-2083journal_volume
3pub_type
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