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Pathway Description
3-Hydroxyisobutyric Acid Dehydrogenase Deficiency
Mus musculus
Category:
Metabolite Pathway
Sub-Category:
Disease
Created: 2018-09-10
Last Updated: 2019-09-15
3-Hydroxyisobutyric acid dehydrogenase deficiency (3-hydroxyisobutyric aciduria) is an extremely rare inborn error of metabolism (IEM), potentially caused by numerous mechanisms. It is currently thought to be autosomal recessively inherited. At least two cases of 3-hydroxyisobutyric aciduria were determined to be caused by a mutation in the ALDH6A1 gene, which encodes acylating methylmalonate-semialdehyde dehydrogenase. This enzyme converts 2-methyl-3-oxopropanoate, CoA and water into propanoyl-CoA, using NAD+ as an oxidizing agent, and producing a hydrogen ion and hydrogencarbonate as byproducts. Other forms of 3-hydroxyisobutyric aciduria may be caused by a mutation in the gene encoding 3-hydroxyisobutyrate dehydrogenase, which forms (S)-methylmalonic acid semialdehyde from (S)-3-hydroxyisobutyric acid. This mutation leads to an accumulation of (S)-3-hydroxyisobutyric acid, as no other processes in the pathway use it. 3-hydroxyisobutyric aciduria is characterized by elevated levels of 3-hydroxyisobutyric acid excreted in the urine. Symptoms of the disorder include dysmorphic features, developmental delays and intellectual disabilities. Treatments are not currently well researched due to the rarity of the condition, but protein-restricted diets may be helpful. It is estimated that 3-hydroxyisobutyric aciduria affects less than 1 in 1,000,000 people, with only 12 cases having been reported by 2006.
References
3-Hydroxyisobutyric Acid Dehydrogenase Deficiency References
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Valine, Leucine, and Isoleucine Degradation References
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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 SMP0000521
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