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Fabry Disease: Thirty-Five Mutations in the α-Galactosidase A Gene in Patients with Classic and Variant Phenotypes

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Abstract

Background

Fabry disease, an X-linked inborn error of glycosphingolipid catabolism, results from mutations in the α-galactosidase A (α-Gal A) gene located 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, the α-Gal A lesions in 42 unrelated Fabry hemizygotes were determined.

Materials and Methods

Genomic DNA was isolated from affected probands and their family members. The seven α-galactosidase A exons and flanking intronic sequences were PCR amplified and the nucleotide sequence was determined by solid-phase direct sequencing.

Results

Two patients with the mild cardiac phenotype had missense mutations, I91T and F113L, respectively. In 38 classically affected patients, 33 new mutations were identified including 20 missense (M1T, A31V, H46R, Y86C, L89P, D92Y, C94Y, A97V, R100T, Y134S, G138R, A143T, S148R, G163V, D170V, C202Y, Y216D, N263S, W287C, and N298S), two nonsense (Q386X, W399X), one splice site mutation (IVS4 + 2T → C), and eight small exonic insertions or deletions (304del1, 613del9, 777del1, 1057del2, 1074del2, 1077del1, 1212del3, and 1094ins1), which identified exon 7 as a region prone to gene rearrangements. In addition, two unique complex rearrangements consisting of contiguous small insertions and deletions were found in exons 1 and 2 causing L45R/H46S and L120X, respectively.

Conclusions

These studies further define the heterogeneity of mutations causing Fabry disease, permit precise carrier identification and prenatal diagnosis in these families, and facilitate the identification of candidates for enzyme replacement therapy.

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Acknowledgements

The authors wish to thank Sheri Mural for assistance in DNA sequencing. We also thank the following physicians for referral of patients and/or diagnostic specimens: Drs. G. Wilson, M. Iamethi, P. Aula, E. K. M. Smith, C. Harris, N. Doyle, L. Clarke, A. Bottani, L. Workman, I. R. C. Sparrow, K. MacDermott, G. Hogansson, P. Slee, B. Kramer, G. Grabowski, J. Graf, B. Wolf, A. Skarbonk, and L. Emtestam. This work was supported in part by grants from the National Institutes of Health including a Merit Award (R37 DK34045), a grant (MO1 RR00071) for the Mount Sinai General Clinical Research Center from the National Center of Research Resources, a grant (P30 HD28822) for the Mount Sinai Child Health Research Center, and a grant from the American Heart Association (New York City affiliate).

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Eng, C.M., Ashley, G.A., Burgert, T.S. et al. Fabry Disease: Thirty-Five Mutations in the α-Galactosidase A Gene in Patients with Classic and Variant Phenotypes. Mol Med 3, 174–182 (1997). https://doi.org/10.1007/BF03401671

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