Factors that affect hearing level in individuals with the mitochondrial 1555A.G mutation.

Abstract:

:The mitochondrial 1555A>G mutation is one of the most common mutations responsible for hearing loss in Asians. Although the association with aminoglycoside exposure is well known, there is great variation in the severity of hearing loss. We analyzed hearing levels in 221 Japanese individuals with this mutation and attempted to identify relevant covariants including (i) age, (ii) aminoglycoside exposure, (iii) heteroplasmy ratio, and (iv) other gene mutations. At every age, average hearing levels were worse than those in normal subjects, suggesting that mitochondrial function itself may affect the severity of hearing loss. Although the hearing loss in individuals with the 1555A>G mutation progressed with age, the rate did not differ from that of the normal subjects. Those who had reported aminoglycoside exposure had moderate-to-severe hearing impairment regardless of age, confirming that such exposure is the most important environmental variable. We also confirmed the presence of heteroplasmy, which is known to modify the expression of other mitochondrial diseases, but found no evidence for a significant correlation with hearing impairment. A high prevalence of GJB2 heterozygous mutations was noted, indicating that these mutations may exhibit epistatic interaction with the 1555A>G mutation.

journal_name

Clin Genet

journal_title

Clinical genetics

authors

Lu SY,Nishio S,Tsukada K,Oguchi T,Kobayashi K,Abe S,Usami S

doi

10.1111/j.1399-0004.2008.01138.x

subject

Has Abstract

pub_date

2009-05-01 00:00:00

pages

480-4

issue

5

eissn

0009-9163

issn

1399-0004

journal_volume

75

pub_type

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