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Liver involvement in urea cycle disorders: a review of the literature

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Journal of Inherited Metabolic Disease

Abstract

Urea cycle disorders (UCDs) are inborn errors of metabolism of the nitrogen detoxification pathway and encompass six principal enzymatic deficiencies. The aging of UCD patients leads to a better knowledge of the long-term natural history of the condition and to the reporting of previously unnoticed manifestations. Despite historical evidence of liver involvement in UCDs, little attention has been paid to this organ until recently. Hence, we reviewed the available scientific evidence on acute and chronic liver dysfunction and liver carcinogenesis in UCDs and discuss their pathophysiology. Overall, liver involvement, such as acute liver failure or steatotic-like disease, which may evolve toward cirrhosis, has been reported in all six main UCDs. Excessive glycogen storage is also a prominent histologic feature, and hypoglycemia has been reported in citrin deficiency. Hepatocarcinomas seem frequent in some UCDs, such as in citrin deficiency, and can sometimes occur in non-cirrhotic patients. UCDs may differ in liver involvement according to the enzymatic deficiency. Ornithine transcarbamylase deficiency may be associated more with acute liver failure and argininosuccinic aciduria with chronic liver failure and cirrhosis. Direct toxicity of metabolites, downstream metabolic deficiencies, impaired tricarboxylic acid cycle, oxidative stress, mitochondrial dysfunction, energy deficit, and putative toxicity of therapies combine in various ways to cause the different liver diseases reported.

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Acknowledgements

The authors kindly thank the members of SFEIMA for their help in this study.

Funding

Dr. Adrien Bigot received the 2016 grant from the Adult group of the French Society for Inborn Errors of Metabolisms (SFEIMA) to support this research.

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Correspondence to Adrien Bigot.

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A. Bigot, M.C. Tchan, B. Thoreau, H. Blasco, and F. Maillot declare that they have no conflict of interest.

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This article does not contain any studies with human or animal subjects performed by any of the authors.

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Communicated by: John Christodoulou

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Bigot, A., Tchan, M.C., Thoreau, B. et al. Liver involvement in urea cycle disorders: a review of the literature. J Inherit Metab Dis 40, 757–769 (2017). https://doi.org/10.1007/s10545-017-0088-5

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  • DOI: https://doi.org/10.1007/s10545-017-0088-5

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