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MPV17 mutation causes neuropathy and leukoencephalopathy with multiple mtDNA deletions in muscle
Emma L Blakely1, Anna Butterworth, Robert D M Hadden
1Mitochondrial Research Group, Institute for Ageing and Health, The Medical School, Newcastle University, Newcastle upon Tyne NE2 4HH, UK.
Abstract:
Disorders of mitochondrial DNA (mtDNA) maintenance are clinically and genetically heterogeneous, embracing recessive mtDNA depletion syndromes affecting children and adult-onset multiple mtDNA deletion disorders. Here we show that mutation of MPV17 - a gene implicated in severe, infantile hepatocerebral mtDNA depletion disorders characterised by a loss of mtDNA copies - can also cause clonally-expanded mtDNA deletion and focal cytochrome c oxidase (COX) deficiency in skeletal muscle associated with an adult presentation of neuropathy and leukoencephalopathy. The mpv17 protein is therefore intimately involved in both the mtDNA replication and repair processes and associated with both quantitative and qualitative mtDNA abnormalities.
Insights
Mutations in the MPV17 gene cause mitochondrial DNA (mtDNA) depletion and deletion disorders. This gene is crucial for mtDNA replication and repair, affecting both mtDNA quantity and quality.
Area of Science:
- Genetics
- Molecular Biology
- Neuroscience
Background:
- Mitochondrial DNA (mtDNA) maintenance disorders are diverse, including childhood depletion syndromes and adult deletion disorders.
- MPV17 gene mutations are known to cause infantile hepatocerebral mtDNA depletion disorders with loss of mtDNA copies.
Observation:
- This study investigated the role of MPV17 in a broader spectrum of mitochondrial disorders.
- Researchers observed that MPV17 mutations can lead to adult-onset neuropathy and leukoencephalopathy.
Findings:
- MPV17 mutations can cause clonally-expanded mtDNA deletion and focal cytochrome c oxidase (COX) deficiency in skeletal muscle.
- The mpv17 protein is involved in both mtDNA replication and repair.
- MPV17 mutations are associated with both quantitative (depletion) and qualitative (deletion) mtDNA abnormalities.
Implications:
- This expands the known clinical and genetic spectrum of MPV17-associated mitochondrial disorders.
- It highlights the dual role of the mpv17 protein in maintaining mtDNA integrity.
- Understanding MPV17's function is crucial for diagnosing and potentially treating a wider range of mitochondrial diseases.
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