Journal article
Arginine does not rescue p.Q188R mutation deleterious effect in classic galactosemia
- Abstract:
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Background
Classic galactosemia is a rare genetic metabolic disease with an unmet treatment need. Current standard of care fails to prevent chronically-debilitating brain and gonadal complications.
Many mutations in the GALT gene responsible for classic galactosemia have been described to give rise to variants with conformational abnormalities. This pathogenic mechanism is highly amenable to a therapeutic strategy based on chemical/pharmacological chaperones. Arginine, a chemical chaperone, has shown beneficial effect in other inherited metabolic disorders, as well as in a prokaryotic model of classic galactosemia.
The p.Q188R mutation presents a high prevalence in the Caucasian population, making it a very clinically relevant mutation. This mutation gives rise to a protein with lower conformational stability and lower catalytic activity. The aim of this study is to assess the potential therapeutic role of arginine for this mutation.
Methods
Arginine aspartate administration to four patients with the p.Q188R/p.Q188R mutation, in vitro studies with three fibroblast cell lines derived from classic galactosemia patients as well as recombinant protein experiments were used to evaluate the effect of arginine in galactose metabolism. This study has been registered at https://clinicaltrials.gov (NCT03580122) on 09 July 2018. Retrospectively registered.
Results
Following a month of arginine administration, patients did not show a significant improvement of whole-body galactose oxidative capacity (p = 0.22), erythrocyte GALT activity (p = 0.87), urinary galactose (p = 0.52) and urinary galactitol levels (p =0.41). Patients’ fibroblasts exposed to arginine did not show changes in GALT activity. Thermal shift analysis of recombinant p.Q188R GALT protein in the presence of arginine did not exhibit a positive effect.
Conclusions
This short pilot study in four patients homozygous for the p.Q188R/p.Q188R mutation reveals that arginine has no potential therapeutic role for galactosemia patients homozygous for the p.Q188R mutation.
- Publication status:
- Published
- Peer review status:
- Peer reviewed
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(Preview, Version of record, pdf, 769.5KB, Terms of use)
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- Publisher copy:
- 10.1186/s13023-018-0954-8
Authors
- Publisher:
- BioMed Central
- Journal:
- Orphanet Journal of Rare Diseases More from this journal
- Volume:
- 13
- Issue:
- 1
- Pages:
- 212
- Publication date:
- 2018-11-26
- Acceptance date:
- 2018-11-14
- DOI:
- EISSN:
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1750-1172
- ISSN:
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1750-1172
- Pmid:
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30477550
- Language:
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English
- Keywords:
- Pubs id:
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pubs:949015
- UUID:
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uuid:4f44f3f2-92d0-4835-bb8f-e083515b6115
- Local pid:
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pubs:949015
- Source identifiers:
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949015
- Deposit date:
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2018-12-10
Terms of use
- Copyright holder:
- Haskovic et al
- Copyright date:
- 2018
- Notes:
- © The Author(s). 2018 Open Access This article is distributed under the terms of the Creative Commons Attribution 4.0 International License (http://creativecommons.org/licenses/by/4.0/), which permits unrestricted use, distribution, and reproduction in any medium, provided you give appropriate credit to the original author(s) and the source, provide a link to the Creative Commons license, and indicate if changes were made. The Creative Commons Public Domain Dedication waiver (http://creativecommons.org/publicdomain/zero/1.0/) applies to the data made available in this article, unless otherwise stated.
- Licence:
- CC Attribution (CC BY)
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