@article {1751,
	title = {Mutations in TTC19 cause mitochondrial complex III deficiency and neurological impairment in humans and flies.},
	journal = {Nat Genet},
	volume = {43},
	year = {2011},
	month = {2011 Mar},
	pages = {259-63},
	abstract = {<p>Although mutations in CYTB (cytochrome b) or BCS1L have been reported in isolated defects of mitochondrial respiratory chain complex III (cIII), most cIII-defective individuals remain genetically undefined. We identified a homozygous nonsense mutation in the gene encoding tetratricopeptide 19 (TTC19) in individuals from two families affected by progressive encephalopathy associated with profound cIII deficiency and accumulation of cIII-specific assembly intermediates. We later found a second homozygous nonsense mutation in a fourth affected individual. We demonstrated that TTC19 is embedded in the inner mitochondrial membrane as part of two high-molecular-weight complexes, one of which coincides with cIII. We then showed a physical interaction between TTC19 and cIII by coimmunoprecipitation. We also investigated a Drosophila melanogaster knockout model for TTC19 that showed low fertility, adult-onset locomotor impairment and bang sensitivity, associated with cIII deficiency. TTC19 is a putative cIII assembly factor whose disruption is associated with severe neurological abnormalities in humans and flies.</p>},
	keywords = {Adult, Animals, Brain, Codon, Nonsense, Drosophila melanogaster, Electron Transport Complex III, Female, Gene Knockdown Techniques, Humans, Male, Membrane Proteins, Mitochondria, Mitochondrial Proteins, Nervous System Diseases},
	issn = {1546-1718},
	doi = {10.1038/ng.761},
	author = {Ghezzi, Daniele and Arzuffi, Paola and Zordan, Mauro and Da Re, Caterina and Lamperti, Costanza and Benna, Clara and d{\textquoteright}Adamo, Pio and Diodato, Daria and Costa, Rodolfo and Mariotti, Caterina and Uziel, Graziella and Smiderle, Cristina and Zeviani, Massimo}
}
@article {1666,
	title = {Severe X-linked mitochondrial encephalomyopathy associated with a mutation in apoptosis-inducing factor.},
	journal = {Am J Hum Genet},
	volume = {86},
	year = {2010},
	month = {2010 Apr 9},
	pages = {639-49},
	abstract = {<p>We investigated two male infant patients who were given a diagnosis of progressive mitochondrial encephalomyopathy on the basis of clinical, biochemical, and morphological features. These patients were born from monozygotic twin sisters and unrelated fathers, suggesting an X-linked trait. Fibroblasts from both showed reduction of respiratory chain (RC) cIII and cIV, but not of cI activities. We found a disease-segregating mutation in the X-linked AIFM1 gene, encoding the Apoptosis-Inducing Factor (AIF) mitochondrion-associated 1 precursor that deletes arginine 201 (R201 del). Under normal conditions, mature AIF is a FAD-dependent NADH oxidase of unknown function and is targeted to the mitochondrial intermembrane space (this form is called AIF(mit)). Upon apoptogenic stimuli, a soluble form (AIF(sol)) is released by proteolytic cleavage and migrates to the nucleus, where it induces "parthanatos," i.e., caspase-independent fragmentation of chromosomal DNA. In vitro, the AIF(R201 del) mutation decreases stability of both AIF(mit) and AIF(sol) and increases the AIF(sol) DNA binding affinity, a prerequisite for nuclear apoptosis. In AIF(R201 del) fibroblasts, staurosporine-induced parthanatos was markedly increased, whereas re-expression of AIF(wt) induced recovery of RC activities. Numerous TUNEL-positive, caspase 3-negative nuclei were visualized in patient $\#$1{\textquoteright}s muscle, again indicating markedly increased parthanatos in the AIF(R201 del) critical tissues. We conclude that AIF(R201 del) is an unstable mutant variant associated with increased parthanatos-linked cell death. Our data suggest a role for AIF in RC integrity and mtDNA maintenance, at least in some tissues. Interestingly, riboflavin supplementation was associated with prolonged improvement of patient $\#$1{\textquoteright}s neurological conditions, as well as correction of RC defects in mutant fibroblasts, suggesting that stabilization of the FAD binding in AIF(mit) is beneficial.</p>},
	keywords = {Apoptosis, Apoptosis Inducing Factor, Caspase 3, Computer Simulation, Dietary Supplements, DNA Primers, DNA, Mitochondrial, Electron Transport, Female, Fibroblasts, Flavin-Adenine Dinucleotide, Genes, X-Linked, Humans, In Situ Nick-End Labeling, Infant, Newborn, Magnetic Resonance Imaging, Male, Mitochondrial Encephalomyopathies, Muscle, Skeletal, Mutation, Nervous System Diseases, Pedigree, Poly(ADP-ribose) Polymerases, Protein Conformation, Riboflavin, Staurosporine, Twins, Monozygotic},
	issn = {1537-6605},
	doi = {10.1016/j.ajhg.2010.03.002},
	author = {Ghezzi, Daniele and Sevrioukova, Irina and Invernizzi, Federica and Lamperti, Costanza and Mora, Marina and d{\textquoteright}Adamo, Pio and Novara, Francesca and Zuffardi, Orsetta and Uziel, Graziella and Zeviani, Massimo}
}
