Abstract
Background: Fabry disease (FD), an X-linked lysosomal storage disease, results from an α-galactosidase A deficiency and altered sphingolipid metabolism. An accumulation of globotriaosylsphingosine (lyso-Gb3) likely triggers the pathological cascade leading to disease phenotype. The pathogenic significance of several Fabry mutations including the R118C α-galactosidase (GLA) gene variant has been disputed. We describe three members of the same family with the R118C variant, each having documented clinical signs of FD, low residual enzyme levels, and an elevated lyso-Gb3 in one heterozygote.
Determining the clinical significance of each GLA gene variant remains an ongoing challenge, with potential for inadequate treatment if the diagnosis of FD is missed. Elevated lyso-Gb3 has been shown to be the most reliable noninvasive marker of clinically relevant GLA variants. While the R118C variant will likely lead to a milder phenotype, additional genetic, epigenetic, and environmental factors can ameliorate or exacerbate the expression and impact on the resultant phenotype and associated complications. Patients affected with this variant warrant closer review and better management of disease risk factors.
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Abbreviations
- αGal:
-
Alpha-galactosidase A
- FD:
-
Fabry disease
- Gb3:
-
Globotriaosylceramide
- GLA:
-
Gene encoding α-galactosidase
- Lyso Gb3:
-
Globotriaosylsphingosine
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Acknowledgments
The authors thank Elizabeth Centra and Donna North for sample preparation and testing of all Fabry patients.
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Communicated by: Martina Huemer
Appendices
Take Home Message
The Fabry R118C GLA mutation may cause clinically significant disease with reduced α galactosidase level and requires ongoing patient follow-up.
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Andrew Talbot was responsible for data interpretation and original manuscript preparation.
Kathy Nicholls was involved in data interpretation and original manuscript preparation.
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Nil direct.
Andrew Talbot has received research support, speaker honoraria, and travel assistance from Shire Corporation and Sanofi Corporation, speaker honoraria and travel assistance from Dainippon Sumitomo Pharma Co, and research support from Amicus Therapeutics and Protalix Biotherapeutics.
Kathy Nicholls has received research support, speaker honoraria, and travel assistance from Shire Corporation and Sanofi Corporation and research support from Amicus Therapeutics and Protalix Biotherapeutics.
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All procedures followed were in accordance with the ethical standards of the responsible committee on human experimentation (institutional and national) and with the Helsinki Declaration of 1975, as revised in 2000(5). Informed consent was obtained from all patients for data analysis of results included in the study.
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Talbot, A., Nicholls, K. (2018). Elevated Lyso-Gb3 Suggests the R118C GLA Mutation Is a Pathological Fabry Variant. In: Morava, E., Baumgartner, M., Patterson, M., Rahman, S., Zschocke, J., Peters, V. (eds) JIMD Reports, Volume 45. JIMD Reports, vol 45. Springer, Berlin, Heidelberg. https://doi.org/10.1007/8904_2018_146
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DOI: https://doi.org/10.1007/8904_2018_146
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