期刊
LIFE-BASEL
卷 13, 期 2, 页码 -出版社
MDPI
DOI: 10.3390/life13020554
关键词
mitochondrial DNA; tRNA(Ser(UCN)); homoplasmic mutation; encephalomyopathy
This article describes a novel homoplasmic m.7484A>G mutation in the tRNA(Ser(UCN)) gene, leading to profound intellectual disability, spastic tetraplegia, sensorineural hearing loss, and typical clinical manifestations of MELAS syndrome in a girl. The same mutation was also found in the mother, causing mild cognitive deficit, cerebellar ataxia, myoclonic epilepsy, sensorineural hearing loss, and myopathy consistent with MERRF syndrome. This is the first anticodon mutation in the tRNA(Ser(UCN)) and the second homoplasmic mutation in the anticodon triplet reported to date.
Mitochondrial tRNA(Ser(UCN)) is considered a hot-spot for non-syndromic and aminoglycoside-induced hearing loss. However, many patients have been described with more extensive neurological diseases, mainly including epilepsy, myoclonus, ataxia, and myopathy. We describe a novel homoplasmic m.7484A>G mutation in the tRNA(Ser(UCN)) gene affecting the third base of the anticodon triplet in a girl with profound intellectual disability, spastic tetraplegia, sensorineural hearing loss, a clinical history of epilepsia partialis continua and vomiting, typical of MELAS syndrome, leading to a myoclonic epilepticus status, and myopathy with severe COX deficiency at muscle biopsy. The mutation was also found in the homoplasmic condition in the mother who presented with mild cognitive deficit, cerebellar ataxia, myoclonic epilepsy, sensorineural hearing loss and myopathy with COX deficient ragged-red fibers consistent with MERRF syndrome. This is the first anticodon mutation in the tRNA(Ser(UCN)) and the second homoplasmic mutation in the anticodon triplet reported to date.
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