JAMA neurology · 2015
Clonal expansion of secondary mitochondrial DNA deletions associated with spinocerebellar ataxia type 28.
СтатьяПоддержка исследования: вне правительства СШАНазвание и аннотация: Перевод в очереди
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Gorman Gráinne S, Pfeffer Gerald, Griffin Helen, Blakely Emma L, Kurzawa-Akanbi Marzena, Gabriel Jessica, Sitarz Kamil, Roberts Mark, Schoser Benedikt, Pyle Angela, Schaefer Andrew M, McFarland Robert, Turnbull Douglass M, Horvath Rita, Chinnery Patrick F, Taylor Robert W
Аннотация
IMPORTANCE: Progressive external ophthalmoplegia (PEO) is a common feature in adults with mitochondrial (mt) DNA maintenance disorders associated with somatic mtDNA deletions in muscle, yet the causal genetic defect in many patients remains undetermined.
OBSERVATIONS: Whole-exome sequencing identified a novel, heterozygous p.(Gly671Trp) mutation in the AFG3L2 gene encoding an mt protease--previously associated with dominant spinocerebellar ataxia type 28 disease--in a patient with indolent ataxia and PEO. Targeted analysis of a larger, genetically undetermined cohort of patients with PEO with suspected mtDNA maintenance abnormalities identified a second unrelated patient with a similar phenotype and a novel, heterozygous p.(Tyr689His) AFG3L2 mutation. Analysis of patient fibroblasts revealed mt fragmentation and decreased AFG3L2 transcript expression. Western blotting of patient fibroblast and muscle showed decreased AFG3L2 protein levels.
CONCLUSIONS AND RELEVANCE: Our observations suggest that AFG3L2 mutations are another important cause, albeit rare, of a late-onset ataxic PEO phenotype due to a disturbance of mtDNA maintenance.
OBSERVATIONS: Whole-exome sequencing identified a novel, heterozygous p.(Gly671Trp) mutation in the AFG3L2 gene encoding an mt protease--previously associated with dominant spinocerebellar ataxia type 28 disease--in a patient with indolent ataxia and PEO. Targeted analysis of a larger, genetically undetermined cohort of patients with PEO with suspected mtDNA maintenance abnormalities identified a second unrelated patient with a similar phenotype and a novel, heterozygous p.(Tyr689His) AFG3L2 mutation. Analysis of patient fibroblasts revealed mt fragmentation and decreased AFG3L2 transcript expression. Western blotting of patient fibroblast and muscle showed decreased AFG3L2 protein levels.
CONCLUSIONS AND RELEVANCE: Our observations suggest that AFG3L2 mutations are another important cause, albeit rare, of a late-onset ataxic PEO phenotype due to a disturbance of mtDNA maintenance.
Предметные рубрики MeSH
ATP-Dependent ProteasesATPases Associated with Diverse Cellular ActivitiesAgedAnimalsCase-Control StudiesDNA, MitochondrialEvolution, MolecularFemaleFibroblastsGenome-Wide Association StudyHumansMitochondrial DiseasesMuscle, SkeletalMutationOphthalmoplegia, Chronic Progressive ExternalSpinocerebellar AtaxiasSpinocerebellar Degenerations