3-Methylglutaconic aciduria type III in a non-Iraqi-Jewish kindred: clinical and molecular findings

Mol Genet Metab. 2002 Jul;76(3):201-6. doi: 10.1016/s1096-7192(02)00047-1.


Type III 3-methylglutaconic aciduria (MGA) (MIM 258501) consists of early bilateral optic atrophy, later development of spasticity, extrapyramidal dysfunction and occasionally cognitive deficits, and urinary excretion of 3-methylglutaconic acid and 3-methylglutaric acid. The presence of the disorder in an Iraqi-Jewish genetic isolate led to mapping of the OPA3 gene to chromosome 19q13.2-q13.3, followed by isolation of the gene itself. OPA3 consists of two exons and codes for a peptide of 179 amino acids. Iraqi-Jewish patients with type III MGA are homozygous for a splice site founder mutation in OPA3 (IVS1-1G>C) which abolishes mRNA expression in fibroblasts. Here we report a novel mutation in OPA3 (320-337del) in a Kurdish-Turkish patient with optic atrophy and 3-methylglutaconic and 3-methylglutaric aciduria, previously carrying the diagnosis of type IV MGA. We conclude that type III MGA occurs in patients of non-Iraqi-Jewish ancestry, and should be considered in patients with type IV MGA that have optic atrophy and ataxia.

Publication types

  • Case Reports
  • Research Support, Non-U.S. Gov't

MeSH terms

  • Adolescent
  • Amino Acid Metabolism, Inborn Errors / genetics*
  • Amino Acid Metabolism, Inborn Errors / pathology*
  • Base Sequence
  • DNA
  • Glutarates / urine*
  • Humans
  • Jews
  • Magnetic Resonance Imaging
  • Male


  • Glutarates
  • 3-methylglutaconic acid
  • DNA