A non-syndromic hearing loss caused by very low levels of the mtDNA A3243G mutation.

Abstract:

:We described a patient with progressive non-syndromic hearing loss (NSHL) harboring the A3243G mutation in the mitochondrial DNA (mtDNA). Muscle biopsy showed scattered ragged-red, cytochrome c oxidase negative fibers, whereas the biochemical analysis of the mitochondrial respiratory chain complexes was normal. Restriction fragment length polymorphism (RFLP) analysis showed A3243G mtDNA transition, present at very low in patient's muscle (3%) and in urinary sediments (1%), and not detectable in blood and buccal mucosa. The patient was submitted to a bilateral cochlear implantation with post-operative excellent hearing and communicative outcomes. Our findings indicate that A3243G mutation may be responsible both for SHL and NSHL, may be depending on the levels of mutated mtDNA. Patients with hearing loss due to mtDNA mutations should be considered as good candidates for cochlear implantation.

journal_name

Acta Neurol Scand

authors

Mancuso M,Filosto M,Forli F,Rocchi A,Berrettini S,Siciliano G,Murri L

doi

10.1111/j.1600-0404.2004.00254.x

subject

Has Abstract

pub_date

2004-07-01 00:00:00

pages

72-4

issue

1

eissn

0001-6314

issn

1600-0404

pii

ANE254

journal_volume

110

pub_type

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