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Human mitochondrial DNA deletions associated with mutations in the gene encoding Twinkle, a phage T7 gene 4-like protein localized in mitochondria
A novel mitochondrial protein, Twinkle, with structural similarity to phage T7 gene 4 primase/helicase and other hexameric ring helicases is reported, inferred to be critical for lifetime maintenance of human mtDNA integrity.
Absence of an orphan mitochondrial protein, c19orf12, causes a distinct clinical subtype of neurodegeneration with brain iron accumulation.
Loss of ETHE1, a mitochondrial dioxygenase, causes fatal sulfide toxicity in ethylmalonic encephalopathy
It was found that thiosulfate was excreted in massive amounts in urine of both Ethe1−/− mice and humans with ethylmalonic encephalopathy, and ETHE1 is a mitochondrial sulfur dioxygenase involved in catabolism of sulfide that accumulates to toxic levels in ethyl malonicEncephalopathy.
Role of adenine nucleotide translocator 1 in mtDNA maintenance.
The identified two heterozygous missense mutations in the nuclear gene encoding the heart/skeletal muscle isoform of the adenine nucleotide translocator (ANT1) in five families and one sporadic patient indicate that ANT has a role in mtDNA maintenance and that a mitochondrial disease can be caused by a dominant mechanism.
Oxygen sensing requires mitochondrial ROS but not oxidative phosphorylation.
MPV17 encodes an inner mitochondrial membrane protein and is mutated in infantile hepatic mitochondrial DNA depletion
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.
Mutations of mitochondrial DNA polymerase γA are a frequent cause of autosomal dominant or recessive progressive external ophthalmoplegia
Data show that mutations of POLG1 are the most frequent cause of familial progressive external ophthalmoplegia associated with accumulation of multiple mitochondrial DNA deletions, accounting for approximately 45% of the family cohort.
Assembly of the oxidative phosphorylation system in humans: what we have learned by studying its defects.
Mutations of SURF-1 in Leigh disease associated with cytochrome c oxidase deficiency.
Sequence analysis of SURF-1 revealed mutations in numerous DNA samples from LD(COX-) patients, indicating that this gene is responsible for the major complementation group in this important mitochondrial disorder.
Infantile encephalopathy and defective mitochondrial DNA translation in patients with mutations of mitochondrial elongation factors EFG1 and EFTu.
Yeast and mammalian cell systems proved the pathogenic role of the mutant alleles by functional complementation in vivo, and genetic investigation involving patients with defective mitochondrial translation led to the discovery of novel mutations in the mitochondrial elongation factor G1 (EFG1) in one affected baby and, for the first time, in the mitochondria elongation factors Tu (EFTu) in another one.