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Pathway Description
3-Hydroxyisobutyric Acid Dehydrogenase Deficiency
Homo sapiens
Category:
Metabolite Pathway
Sub-Category:
Disease
Created: 2013-08-29
Last Updated: 2022-11-17
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
[Metagen: 3-HYDROXYISOBUTYRIC ACID DEHYDROGENASE DEFICIENCY](http://metagene.de/program/d.prg?id_d=553)
Loupatty FJ, van der Steen A, Ijlst L, Ruiter JP, Ofman R, Baumgartner MR, Ballhausen D, Yamaguchi S, Duran M, Wanders RJ: Clinical, biochemical, and molecular findings in three patients with 3-hydroxyisobutyric aciduria. Mol Genet Metab. 2006 Mar;87(3):243-8. doi: 10.1016/j.ymgme.2005.09.019. Epub 2006 Feb 8.
Pubmed: 16466957
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Pubmed: 21863277
Valine, Leucine, and Isoleucine Degradation References
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Pubmed: 21104317
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Pubmed: 2365818
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Pubmed: 8651316
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McKean MC, Winkeler KA, Danner DJ: Nucleotide sequence of the 5' end including the initiation codon of cDNA for the E1 alpha subunit of the human branched chain alpha-ketoacid dehydrogenase complex. Biochim Biophys Acta. 1992 Nov 15;1171(1):109-12. doi: 10.1016/0167-4781(92)90149-t.
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Feigenbaum AS, Robinson BH: The structure of the human dihydrolipoamide dehydrogenase gene (DLD) and its upstream elements. Genomics. 1993 Aug;17(2):376-81. doi: 10.1006/geno.1993.1335.
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Otulakowski G, Robinson BH: Isolation and sequence determination of cDNA clones for porcine and human lipoamide dehydrogenase. Homology to other disulfide oxidoreductases. J Biol Chem. 1987 Dec 25;262(36):17313-8.
Pubmed: 3693355
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Pubmed: 3278312
Wang SP, Robert MF, Gibson KM, Wanders RJ, Mitchell GA: 3-Hydroxy-3-methylglutaryl CoA lyase (HL): mouse and human HL gene (HMGCL) cloning and detection of large gene deletions in two unrelated HL-deficient patients. Genomics. 1996 Apr 1;33(1):99-104. doi: 10.1006/geno.1996.0164.
Pubmed: 8617516
Mitchell GA, Robert MF, Hruz PW, Wang S, Fontaine G, Behnke CE, Mende-Mueller LM, Schappert K, Lee C, Gibson KM, Miziorko HM, et al.: 3-Hydroxy-3-methylglutaryl coenzyme A lyase (HL). Cloning of human and chicken liver HL cDNAs and characterization of a mutation causing human HL deficiency. J Biol Chem. 1993 Feb 25;268(6):4376-81.
Pubmed: 8440722
Schuldiner O, Eden A, Ben-Yosef T, Yanuka O, Simchen G, Benvenisty N: ECA39, a conserved gene regulated by c-Myc in mice, is involved in G1/S cell cycle regulation in yeast. Proc Natl Acad Sci U S A. 1996 Jul 9;93(14):7143-8. doi: 10.1073/pnas.93.14.7143.
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Pubmed: 17974005
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