Journal of Inherited Metabolic Disease

, Volume 9, Issue 2, pp 175–185 | Cite as

Ornithine transcarbamylase deficiency: a case with a truncated enzyme precursor and a case with undetectable mRNA activity

  • H. Kodama
  • A. Ohtake
  • M. Mori
  • I. Okabe
  • M. Tatibana
  • S. Kamoshita
Article
  • 32 Downloads

Abstract

The cell-free translation of ornithine transcarbamylase (OTC) mRNA from the livers of two heterozygous patients (from different families) with OTC deficiency was performed. The enzyme activities and the immunoreactive proteins in both patients were about 5% of those in controls. Immunoblotting assay of liver extracts from both patients showed decreased amounts of the OTC protein. The mRNA from the liver of patient 1 directed the synthesis of a very small amount of OTC precursor of normal subunit size (40 000 Da), whereas that from patient 2 directed the synthesis of small amounts of two distinctin vitro products; one was 40 000 Da and the other was about 30 000 Da. Thein vitro product of normal precursor synthesized with mRNA from patient 2 was converted to mature-sized OTC by isolated rat liver mitochondria, whereas the smaller product was degraded during the incubation with the mitochondria. These results indicate that in both patients the translatable level of mRNA for active OTC from liver cells was much lower than that in the controls. The results also suggest that in patient 2, the smaller product presumably derived from an abnormal gene could not be transferred to the mitochondria.

Keywords

Ornithine Liver Extract Control Liver Ornithine Transcarbamylase Polypeptide Band 

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Copyright information

© SSIEM and MTP Press Limited 1986

Authors and Affiliations

  • H. Kodama
    • 1
  • A. Ohtake
    • 2
  • M. Mori
    • 2
  • I. Okabe
    • 1
  • M. Tatibana
    • 2
  • S. Kamoshita
    • 1
  1. 1.Department of PediatricsJichi Medical School, Minamikawachi-machiKawachi-gun, Tochigi-kenJapan
  2. 2.Department of BiochemistryChiba University School of MedicineInohana, ChibaJapan

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