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Open Access 01-12-2017 | Letter to the Editor

Possible mechanisms for sensorineural hearing loss and deafness in patients with propionic acidemia

Authors: S. C. Grünert, I. Bodi, K. E. Odening

Published in: Orphanet Journal of Rare Diseases | Issue 1/2017

Abstract

Propionic acidemia is an inborn error of metabolism caused by deficiency of the mitochondrial enzyme propionyl-CoA carboxylase. Sensorineural deafness and severe hearing loss have been described as long-term complications of this disease, however, the mechanism has not yet been elucidated. We have recently shown by patch clamping experiments and Western blots that acute and chronic effects of accumulating metabolites such as propionic acid, propionylcarnitine and methylcitrate on the KvLQT1/KCNE1 channel complex cause long QT syndrome in patients with propionic acidemia by inhibition of K⁺ flow via this channel. The same KvLQT1/KCNE1 channel complex is expressed in the inner ear and essential for luminal potassium secretion into the endolymphatic space. A disruption of this K⁺ flow results in sensorineural hearing loss or deafness. It can be assumed that acute and chronic effects of accumulating metabolites on the KvLQT1/KCNE1 channel protein may similarly cause the hearing impairment of patients with propionic acidemia.

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Title: Possible mechanisms for sensorineural hearing loss and deafness in patients with propionic acidemia
Authors: S. C. Grünert
I. Bodi
K. E. Odening
Publication date: 01-12-2017
Publisher: BioMed Central
Published in: Orphanet Journal of Rare Diseases / Issue 1/2017
Electronic ISSN: 1750-1172
DOI: https://doi.org/10.1186/s13023-017-0585-5

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Springer Medicine

Possible mechanisms for sensorineural hearing loss and deafness in patients with propionic acidemia

Abstract

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Abstract

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