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目的:线粒体DNA 8344 A>G(m.8344A>G)是肌阵挛性癫痫伴破碎红纤维(mitochondrial myoclonus epilepsy with ragged-red fibers,MERRF)综合征的常见致病突变,报道1例罕见的由m.8344A>G突变引起的线粒体脑肌病伴乳酸酸中毒和卒中样发作/肌阵挛性癫痫伴破碎红纤维/Leigh(mitochondrial encephalopathy,lactic acidosis and stroke-like episodes/