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Canavan disease

Analysis of the nature of the metabolic lesions responsible for development of the observed clinical symptoms

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Abstract

Canavan disease (CD), a rare recessive autosomal genetic disorder, is characterized by early onset and a progressive spongy degeneration of the brain involving loss of the axon’s myelin sheath. After a relatively normal birth, homozygous individuals generally develop clinical symptoms within months, and usually die within several years of the onset of the disease. A biochemical defect associated with this disease results in reduced activity of the enzymeN-acetyl-l-aspartate amidohydrolase (aspartoacylase) and affected individuals have less ability to hydrolyzeN-acetyl-l-aspartate (NAA) in brain and other tissues. As a result of aspartoacylase deficiency, NAA builds up in extracellular fluids (ECF) and is excreted in urine. From an analysis of the NAA biochemical cycle in various tissues of many vertebrate species, evidence is presented that there may be two distinct NAA circulation patterns related to aspartoacylase activity. These include near-field circulations in the brain and the eye, and a far-field systemic circulation involving the liver and kidney, the purpose of which in each case is apparently to regenerate aspartate (Asp) in order for it to be recycled into NAA as part of the still unknown function of the NAA cycle. Based on the authors’ analysis, they have also identified several metabolic outcomes of the genetic biochemical aspartoacylase lesion. First, there is a daily induced Asp deficit in the central nervous system (CNS) that is at least six times the static level of available free Asp. Second, there is up to a 50-fold drop in the intercompartmental NAA gradient, and third, the ability of the brain to perform its normal intercompartmental cycling of NAA to Asp is terminated, and as a result, the only remaining long-term source of Asp for NAA synthesis is via nutritional supplementation of Asp or its metabolic precursors. Finally, the authors identify a potential maternal-fetal interaction that may be responsible for observed normal fetal development in utero, and that provides a rationale for, and suggests how, CD might respond to far-field nutritional, transplantation, or genetic engineering techniques to alter the course of the disease.

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Authors and Affiliations

  1. Nathan S. Kline Institute for Psychiatric Research, Center for Neurochemistry, 10962, Orangeburg, NY

    Morris H. Baslow & Tracy R. Resnik

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  1. Morris H. Baslow
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  2. Tracy R. Resnik
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Baslow, M.H., Resnik, T.R. Canavan disease. J Mol Neurosci 9, 109–125 (1997). https://doi.org/10.1007/BF02736855

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  • DOI: https://doi.org/10.1007/BF02736855

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