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Pathway Description
3-Hydroxyisobutyric Aciduria
Rattus norvegicus
Category:
Metabolite Pathway
Sub-Category:
Disease
Created: 2018-09-10
Last Updated: 2019-09-15
3-Hydroxyisobutyric aciduria, also called HIBA, is an extremely rare inherited inborn error of metabolism (IEM) of valine metabolism. Only 12-13 patients have been identified with this condition. It is an autosomal recessive disorder that may be caused, in some cases, by a defective aldehyde dehydrogenase 6 family member A1 (ALDH6A1) gene which codes for methylmalonate semialdehyde dehydrogenase (MMSDH). MMSDH is a mitochondrial methylmalonate semialdehyde dehydrogenase that plays a role in the valine and pyrimidine catabolism. This protein catalyzes the irreversible oxidative decarboxylation of malonate and methylmalonate semialdehydes to acetyl- and propionyl-CoA. Another possible cause of the disorder is a mutation in 3-hydroxyisobutyrate dehydrogenase, a mitochondrial enzyme which catalyzes the conversion of 3-hydroxyisobutyrate into methylmalonic semialdehyde, or in the conversion of the semialdehyde to propionyl-CoA. Individuals with this disorder have very high levels of 3-hydroxyisobutyric acid secreted in their urine. Other indications of organic acidemia are also present. Signs and symptoms of 3-hydroxyisobutyric aciduria include developmental delay, dysmorphic facial features, and brain abnormalities. The excretion of 3-hydroxyisobutyric acid in the urine can range from 170 to 390 mmol/mol of creatinine. Concentrations of free carnitine are also low, and esterified carnitine can be elevated in patients. Protein-restricted diets and carnitine supplementation have been tried with varying degrees of success.
References
3-Hydroxyisobutyric Aciduria References
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Pubmed: 1956714
Valine, Leucine, and Isoleucine Degradation References
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Pubmed: 1390893
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Pubmed: 7841205
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Pubmed: 2822716
Moser K, White FM: Phosphoproteomic analysis of rat liver by high capacity IMAC and LC-MS/MS. J Proteome Res. 2006 Jan;5(1):98-104. doi: 10.1021/pr0503073.
Pubmed: 16396499
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Pubmed: 15489334
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Pubmed: 8530459
This pathway was propagated using PathWhiz -
Pon, A. et al. Pathways with PathWhiz (2015) Nucleic Acids Res. 43(Web Server issue): W552–W559.
Propagated from SMP0000522
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