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Sequence analysis of nuclear genes encoding functionally important complex I subunits in children with
Reetta Hinttala1, Johanna Uusimaa, Anne M Remes
1Department of Neurology, University of Oulu, Finland.
Journal of Molecular Medicine (Berlin, Germany)
|September 6, 2005
Summary
Researchers investigated genetic mutations causing Complex I deficiency in children. A novel mutation in the NDUFS8 gene was identified, but it may not be the sole cause of the disease, suggesting other genetic factors are involved.
Area of Science:
- Biochemistry
- Genetics
- Molecular Biology
Background:
- Complex I is crucial for cellular energy production.
- Deficiency in Complex I leads to varied clinical symptoms, from infant lactic acidosis to adult muscle weakness.
- Mutations in nuclear-encoded genes are common causes of Complex I deficiency in children.
Purpose of the Study:
- To identify genetic mutations responsible for Complex I deficiency in pediatric patients.
- To investigate a novel missense mutation in the NDUFS8 gene.
Main Methods:
- Sequencing of nine nuclear-encoded Complex I subunit genes in 13 children with Complex I deficiency.
- Bioinformatic analysis of identified genetic variants.
- Assessment of Complex I assembly and activity in patient-derived fibroblasts.
Main Results:
- Two novel substitutions were identified: a synonymous change in NDUFV2 and a missense mutation (Arg18Cys) in NDUFS8.
- The NDUFS8 Arg18Cys mutation was found in a patient and her mother, but not in controls.
- Bioinformatic analysis suggested potential impacts on the mitochondrial-targeting peptide, but no significant changes in Complex I assembly, activity, or NDUFS8 transcription were observed.
Conclusions:
- The novel NDUFS8 Arg18Cys mutation may not be solely pathogenic.
- Other genetic factors likely contribute to the disease-causing potential of this mutation in Complex I deficiency.