Other names: beta-hydroxyisovalerate
3-Hydroxyisovaleric Acid (3-HIA) is formed from the metabolism of the branched-chain amino acid leucine. Methylcrotonyl-CoA carboxylase catalyzes an essential step in this pathway and is biotin dependent. Reduced activity of this enzyme leads to an alternate pathway of metabolism resulting in 3-hydroxyisovaleric acid.
- Mock NI, Malik MI, Stumbo PJ, Bishop WP, Mock DM. Increased urinary excretion of 3-hydroxyisovaleric acid and decreased urinary excretion of biotin are sensitive early indicators of decreased biotin status in experimental biotin deficiency. Am J Clin Nutr. 1997;65(4):951-958.
- Mock DM, Quirk JG, Mock NI. Marginal biotin deficiency during normal pregnancy. Am J Clin Nutr. 2002;75(2):295-299.
- Sealey WM, Teague AM, Stratton SL, Mock DM. Smoking accelerates biotin catabolism in women. Am J Clin Nutr. 2004;80(4):932-935.
- Mock DM, Dyken ME. Biotin catabolism is accelerated in adults receiving long-term therapy with anticonvulsants. Neurology. 1997;49(5):1444-1447.
Low levels of 3-Hydroxyisovaleric (beta-hydroxyisovalerate) may occur if there are low levels of precursors (leucine), if there are nutritional enzyme inhibitions, or if a low-activity enzyme variant is inherited. The enzyme that converts leucine into beta- hydroxyisovalerate is vitamin B6 dependent and this step in the BCAA breakdown pathway is shared by all of the BCAAs.
Either a nutritional deficiency or an inherited metabolic disorder may decrease the levels of all the BCAA-derived analytes (alpha- ketoisovalerate, alpha-ketoisocaproate, alpha-keto-beta-methylvalerate, beta-hydroxyisovalerate).
Elevated urinary beta-hydroxyisovalerate may occur with:
Cardiovascular disorders or high blood pressure
Inborn errors of metabolism
These disorders are usually diagnosed in infancy
Medications (carbamazepine and/or phenytoin). Check all medications with a pharmacist.
High levels of 3-Hydroxyisovaleric (beta-hydroxyisovalerate) may occur when there are nutritional enzyme inhibitions of the breakdown pathways, inherited low-activity enzymes are present, if there are high levels of precursors (leucine, BCAAs), or if there are higher levels of its downstream products.
Higher levels of circulating BCAAs have been associated with obesity, metabolic syndrome, cardiovascular and hypertension risks. Higher circulating levels of leucine and isoleucine have been associated with cardiovascular risk. The risk appears to be associated with low-activity enzymes in the breakdown pathway. Higher levels of beta-hydroxyisovalerate may inhibit mitochondrial function. Medications may increase levels; check all medication use with a pharmacist. Inborn errors of metabolism, such as maple syrup urine disease, increase levels of alpha keto acids which act as neurotoxins in the central nervous system.
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