Normal fibroblast mitochondrial malic enzyme activity in Friedreich's ataxia
Related Experiment Videos
Abstract:
Mitochondrial and cytoplasmic malic isoenzymes were assayed fluorometrically in digitonin-fractionated fibroblasts from three patients with Friedreich's ataxia (FA). Normal activity was found, failing to verify an earlier report of reduced fibroblast mitochondrial malic enzyme activity in FA. The previously reported disturbance in fibroblast mitochondrial malic enzyme may be an epiphenomenon in patients with the FA phenotype. Further studies are necessary to define the primary genetic defect in this inherited disorder.
Insights
Researchers found normal mitochondrial malic enzyme activity in Friedreich's ataxia (FA) fibroblasts, contradicting earlier findings. This suggests the previously reported enzyme disturbance in FA may be secondary, not the primary genetic cause.
Area of Science:
- Biochemistry
- Genetics
- Cell Biology
Background:
- Friedreich's ataxia (FA) is an inherited neurodegenerative disorder.
- Previous studies suggested altered mitochondrial malic enzyme activity in FA fibroblasts.
Purpose of the Study:
- To investigate mitochondrial and cytoplasmic malic isoenzyme activity in Friedreich's ataxia (FA) fibroblasts.
- To verify or refute earlier reports of reduced mitochondrial malic enzyme activity in FA.
Main Methods:
- Fibroblasts from three FA patients were analyzed.
- Malic isoenzymes were assayed fluorometrically.
- Digitonin fractionation was used to isolate cellular compartments.
Main Results:
- Normal activity levels for both mitochondrial and cytoplasmic malic isoenzymes were observed.
- The findings did not support previous reports of reduced mitochondrial malic enzyme activity in FA.
Conclusions:
- The previously reported disturbance in fibroblast mitochondrial malic enzyme activity in FA may be an epiphenomenon.
- Further research is required to identify the primary genetic defect in Friedreich's ataxia.