The Mitochondrial TRNA Gene: A Novel M.7484A>G Mutation Associated with Mitochondrial Encephalomyopathy and Literature Review

Overview

Journal Life (Basel)

Specialty Biology

Date 2023 Feb 25

PMID 36836911

Authors

Eugenia Borgione

Mariangela Lo Giudice

Sandro Santa Paola

Marika Giuliano

Francesco Domenico Di Blasi

Vincenzo Di Stefano

Antonino Lupica

Filippo Brighina

Rosa Pettinato

Corrado Romano

Carmela Scuderi

Affiliations

Soon will be listed here.

Abstract

Mitochondrial tRNA 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 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 and the second homoplasmic mutation in the anticodon triplet reported to date.

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