2-Hydroxyglutaric Aciduria

**Semantic type:** Disease or Syndrome

**Definition:** A group of genetic disorders characterized by elevated urinary concentrations of 2-hydroxyglutaric acid. Three different types have been identified based on the steroisomeric composition of the elevated alpha-hydroxyglutaric acid metabolites. Additionally, the disease may be categorized by the genetic mutation that is causative. Genes associated with 2-hydroxyglutaric aciduria are L2HGDH, D2HGDH, IDH2, and/or SLC25A1. Generally, there is nervous system involvement, but the clinical manifestations are variable and are dependent on the specific type of defect present.