GJB2235delC单杂合突变携带者的纯音测听评估

目的 分析GJB2突变致聋患者父母(GJB2 235delC单杂合突变携带者)的听力变化特点.方法 32例30～60岁经直接测序法证实为GJR2基因235delC单杂合突变的携带者作为研究对象,选择32例年龄和性别相匹配的无GJB2基因突变的健康人作为对照组.两组均进行纯音测听,比较不同年龄段各频率纯音听阈的差异.结果 与对照组相比,突变基因携带者各年龄段4000及8000 Hz高频听力均下降,且从40～49岁年龄段开始1000及2000 Hz中频听力也开始出现减退,差异具有统计学意义(P值均＜0.05);随着年龄的增加,听力损失有逐渐加重的趋势.结论 GJB2235delC致聋等位基因携带者可能是耳聋的危险群体,不仅存在高频听力损失,40岁以后即可能出现中频听力下降.

Abstract：

Objective To analyze GJB2 235delC monoallelic mutation carrier individuals and test the possible presence and incidence of audiometric abnormalities among 30 - 60 years old carriers of the 235delC mutations.Methods A total of 32 unrelated subjects with nonsyndromic hearing loss were screened for the 235delC mutation.Tonal audiometric analysis was performed on the 235delC mutation carrier group and on a non-carrier control group.Results Audiometric evaluations in the control group showed the presence of thresholds within normal limits at all frequencies,while carriers of the 235delC mutation presented with decreasd hearing at 1000 Hz and 2000 Hz (age 40-49 years and 50-59 years) ,and 4000 and 8000 Hz( age 30-59 years) ,P ＜ 0.05.The hearing loss of carriers gradually increased with age.Conclusions GJB2 235delC heterozygous carriers may be a risk group for high-frequency hearing loss.Hearing thresholds may deteriorate in the intermediate frequencies over the age of 40.

Tonal audiometry of GJB2 235delC single heterozygous mutation carriers

Objective To analyze GJB2 235delC monoallelic mutation carrier individuals and test the possible presence and incidence of audiometric abnormalities among 30 - 60 years old carriers of the 235delC mutations.Methods A total of 32 unrelated subjects with nonsyndromic hearing loss were screened for the 235delC mutation.Tonal audiometric analysis was performed on the 235delC mutation carrier group and on a non-carrier control group.Results Audiometric evaluations in the control group showed the presence of thresholds within normal limits at all frequencies,while carriers of the 235delC mutation presented with decreasd hearing at 1000 Hz and 2000 Hz (age 40-49 years and 50-59 years) ,and 4000 and 8000 Hz( age 30-59 years) ,P ＜ 0.05.The hearing loss of carriers gradually increased with age.Conclusions GJB2 235delC heterozygous carriers may be a risk group for high-frequency hearing loss.Hearing thresholds may deteriorate in the intermediate frequencies over the age of 40.