Infantile hepatocerebral syndromes associated with mutations in the mitochondrial DNA polymerase-γA
Gianfrancesco Ferrari,Eleonora Lamantea,Alice Donati,Massimiliano Filosto,Egill Briem,Franco Carrara,Rossella Parini,Alessandro Simonati,René Santer,Massimo Zeviani +9 more
TLDR
Analysis of POLG1, the gene encoding the catalytic subunit of mitochondrial DNA polymerase, revealed that all the patients carried different allelic mutations in this gene, indicating that Alpers' syndrome is a major disease gene in mitochondrial disorders.Abstract:
We studied nine infant patients with a combination of progressive neurological and hepatic failure. Eight children, including two sibling pairs and four singletons, were affected by Alpers' hepatopathic poliodystrophy. A ninth baby patient suffered of a severe floppy infant syndrome associated with liver failure. Analysis of POLG1, the gene encoding the catalytic subunit of mitochondrial DNA polymerase, revealed that all the patients carried different allelic mutations in this gene. POLG1 is a major disease gene in mitochondrial disorders. Mutations in this gene can be associated with multiple deletions, depletion or point mutations of mitochondrial DNA (mtDNA). In turn, these different molecular phenotypes dictate an extremely heterogeneous spectrum of clinical outcomes, ranging from adult-onset progressive ophthalmoplegia to juvenile ataxic syndromes with epilepsy, to rapidly fatal hepatocerebral presentations, including Alpers' syndrome.read more
Citations
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Journal ArticleDOI
Mitochondrial Dynamics in Mammalian Health and Disease
TL;DR: Findings in the field of mitochondrial dynamics in mammalian cells and their implication in human pathologies have established mitochondrial dynamics as a consolidated area in cellular physiology.
Journal ArticleDOI
Mutation of RRM2B, encoding p53-controlled ribonucleotide reductase (p53R2), causes severe mitochondrial DNA depletion.
Alice Bourdon,Limor Minai,Valérie Serre,Valérie Serre,Jean-Philippe Jais,Emmanuelle Sarzi,Sophie Aubert,Dominique Chretien,Pascale de Lonlay,Véronique Paquis-Flucklinger,Hirofumi Arakawa,Yusuke Nakamura,Arnold Munnich,Agnès Rötig +13 more
TL;DR: The mtDNA depletion triggered by p53R2 alterations in both human and mouse implies that p 53R2 has a crucial role in dNTP supply for mtDNA synthesis, which implies that the majority of cases remain unexplained.
Journal ArticleDOI
POLG mutations associated with Alpers' syndrome and mitochondrial DNA depletion
Robert K. Naviaux,Khue Vu Nguyen +1 more
TL;DR: In two unrelated pedigrees of Alpers' syndrome, each affected child was found to carry a homozygous mutation in exon 17 of the POLG locus that led to a Glu873Stop mutation just upstream of the polymerase domain of the protein.
Journal ArticleDOI
MPV17 encodes an inner mitochondrial membrane protein and is mutated in infantile hepatic mitochondrial DNA depletion
Antonella Spinazzola,Carlo Viscomi,Erika Fernandez-Vizarra,Franco Carrara,Pio D'Adamo,Sarah E. Calvo,Sarah E. Calvo,René Massimiliano Marsano,Claudia Donnini,Hans Weiher,Pietro Strisciuglio,Rossella Parini,Emmanuelle Sarzi,Alicia Chan,Salvatore DiMauro,Agnès Rötig,Paolo Gasparini,Iliana Ferrero,Vamsi K. Mootha,Vamsi K. Mootha,Valeria Tiranti,Massimo Zeviani +21 more
TL;DR: It is demonstrated that, contrary to the alleged peroxisomal localization of the MPV17 gene product, MPV 17 is a mitochondrial inner membrane protein, and its absence or malfunction causes oxidative phosphorylation (OXPHOS) failure and mtDNA depletion, not only in affected individuals but also in Mpv17−/− mice.
Journal ArticleDOI
Phenotypic spectrum associated with mutations of the mitochondrial polymerase γ gene
Rita Horvath,Gavin Hudson,Gianfrancesco Ferrari,N Futterer,Sofia Ahola,Eleonora Lamantea,Holger Prokisch,Hanns Lochmüller,Robert McFarland,Ramesh,Thomas Klopstock,Peter Freisinger,Fabrizio Salvi,Johannes A. Mayr,Roger D. Santer,Marketa Tesarova,Jiri Zeman,Bjarne Udd,Robert W. Taylor,Douglass M. Turnbull,Michael G. Hanna,Doreen Fialho,Anu Suomalainen,M Zeviani,Patrick F. Chinnery +24 more
TL;DR: POLGI was sequenced in patients from different European diagnostic and research centres to define the phenotypic spectrum and advance understanding of the recurrence risks and identify multiple mutations that can have complex implications for genetic counselling.
References
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