Cited by 127Mitochondrial Function and PathologyMetabolism and Genetic DisordersHereditary Neurological Disorders

The DOI matches its Crossref record; 30 of the 30 references it cites were found in a registry or an index.

Disturbed mitochondrial and peroxisomal dynamics due to loss of MFF causes Leigh-like encephalopathy, optic atrophy and peripheral neuropathy

Abstract

Background: Mitochondria are dynamic organelles which undergo continuous fission and fusion to maintain their diverse cellular functions. Components of the fission machinery are partly shared between mitochondria and peroxisomes, and inherited defects in two such components (dynamin-related protein (DRP1) and ganglioside-induced differentiation-associated protein 1 (GDAP1)) have been associated with human disease. Deficiency of a third component (mitochondrial fission factor, MFF) was recently reported in one index patient, rendering MFF another candidate disease gene within the expanding field of mitochondrial and peroxisomal dynamics. Here we investigated three new patients from two families with pathogenic mutations in MFF . Methods: The patients underwent clinical examination, brain MRI, and biochemical, cytological and molecular analyses, including exome sequencing. Results: The patients became symptomatic within the first year of life, exhibiting seizures, developmental delay and acquired microcephaly. Dysphagia, spasticity and optic and peripheral neuropathy developed subsequently. Brain MRI showed Leigh-like patterns with bilateral changes of the basal ganglia and subthalamic nucleus, suggestive of impaired mitochondrial energy metabolism. However, activities of mitochondrial respiratory chain complexes were found to be normal in skeletal muscle. Exome sequencing revealed three different biallelic loss-of-function variants in MFF in both index cases. Western blot studies of patient-derived fibroblasts indicated normal content of mitochondria and peroxisomes, whereas immunofluorescence staining revealed elongated mitochondria and peroxisomes. Furthermore, increased mitochondrial branching and an abnormal distribution of fission-mediating DRP1 were observed. Conclusions: Our findings establish MFF loss of function as a cause of disturbed mitochondrial and peroxisomal dynamics associated with early-onset Leigh-like basal ganglia disease. We suggest that, even if laboratory findings are not indicative of mitochondrial or peroxisomal dysfunction, the co-occurrence of optic and/or peripheral neuropathy with seizures warrants genetic testing for MFF mutations.

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Crossref · 10.1136/jmedgenet-2015-103500

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Metadata

Authors
Koch, J., Feichtinger, R. G., Freisinger, P., Pies, M., Schrödl, F., Iuso, A., Sperl, W., Mayr, J. A., Prokisch, H., & Haack, T. B.
Affiliations
  • Paracelsus Medical University (AT)
  • Kreiskliniken Reutlingen (DE)
  • Klinikum Frankfurt Höchst (DE)
  • Department of Ophthalmology and Optometry, Department of Anatomy, Department of Laboratory Medicine (HW), and First Department of Internal Medicine, Paracelsus Medical University, Salzburg, Austria
  • TUM Klinikum (DE)
Corresponding author
Koch, Johannes
Venue
Journal of Medical Genetics
Publisher
BMJ
Published
2016-01-18
Volume
53
Issue
4
Pages
270-278
ISSN
  • 0022-2593 (ISSN-L)
  • 1468-6244
OpenAlex
W2298458814
Cited by
127
References
30
Citations by year
2026: 1 · 2025: 6 · 2024: 6 · 2023: 8 · 2022: 20 · 2021: 25 · 2020: 20 · 2019: 10 · 2018: 15 · 2017: 11 · 2016: 4
FWCI
6.93
Type
journal article
Language
en
Open access
closed
Locations
  • Journal of Medical Genetics (publishedVersion)
  • PubMed (publishedVersion)
  • mediaTUM (Technical University of Munich) (submittedVersion)
  • HighWire Press Open Archive (submittedVersion)
  • Site cant be reached (submittedVersion)
  • PuSH - Publication Server of Helmholtz Zentrum München (submittedVersion)
Funders
E-Rare
Topics
  • Life Sciences › Biochemistry, Genetics and Molecular Biology › Molecular Biology › Mitochondrial Function and Pathology
  • Life Sciences › Biochemistry, Genetics and Molecular Biology › Clinical Biochemistry › Metabolism and Genetic Disorders
  • Life Sciences › Neuroscience › Cellular and Molecular Neuroscience › Hereditary Neurological Disorders
Keywords
mitochondrial fission factor, mitochondrial dynamics, optic atrophy, peripheral neuropathy, Drp1, GDAP1, mitochondrial fission, seizures, developmental delay, microcephaly, mitochondrial bioenergetics, inherited mitochondrial disease
MeSH terms
Basal Ganglia Diseases, Brain Diseases, Child, Preschool, Humans, Infant, Magnetic Resonance Imaging, Male, Membrane Proteins, Mitochondria, Nerve Tissue Proteins, Optic Atrophy, Peripheral Nervous System Diseases, Peroxisomes, Mitochondrial Proteins, High-Throughput Nucleotide Sequencing, Exome

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