Age-related hearing loss（AHL） is one of the most common sensory disorders among elderly persons. The inwardly rectifying potassium channel 5.1（Kir5.1） plays a vital role in regulating cochlear K~＋ circulation whi...Age-related hearing loss（AHL） is one of the most common sensory disorders among elderly persons. The inwardly rectifying potassium channel 5.1（Kir5.1） plays a vital role in regulating cochlear K~＋ circulation which is necessary for normal hearing. The distribution of Kir5.1 in C57BL/6J mice cochleae, and the relationship between the expression of Kir5.1 and the etiology of AHL were investigated. Forty C57BL/6J mice were randomly divided into four groups at 4, 12, 24 and 52 weeks of age respectively. The location of Kir5.1 was detected by immunofluorescence technique. The m RNA and protein expression of Kir5.1 was evaluated in mice cochleae using real-time polymerase-chain reactions（RT-PCR） and Western blotting respectively. Kir5.1 was detected in the type Ⅱ and Ⅳfibrocytes of the spiral ligament in the cochlear lateral wall of C57BL/6J mice. The expression levels of Kir5.1 m RNA and protein in the cochleae of aging C57BL/6J mice were down-regulated. It was suggested that the age-related decreased expression of Kir5.1 in the lateral wall of C57BL/6J mice was associated with hearing loss. Our results indicated that Kir5.1 may play an important role in the pathogenesis of AHL.展开更多
目的研究一个鳃-耳-肾综合征(branchio-oto-renal,BOR)家系的临床表型及遗传学特征。方法通过家系调查、临床检查和遗传学特征分析,对一个鳃-耳-肾综合征家系的临床表型及致病原因进行系统研究,提取家系成员的外周血DNA,采用遗传性耳聋...目的研究一个鳃-耳-肾综合征(branchio-oto-renal,BOR)家系的临床表型及遗传学特征。方法通过家系调查、临床检查和遗传学特征分析,对一个鳃-耳-肾综合征家系的临床表型及致病原因进行系统研究,提取家系成员的外周血DNA,采用遗传性耳聋基因芯片进行最常见的GJB2(135 del G、176 del 16、299 del AT、235 del C)、GJB3(538 c>T)、SLC26A4(2168A>G、IVS7-2A>G)、mtDNA12SrRNA(1494C>T、1555C>T)4个基因9个耳聋位点检测,利用Sanger法进行基因测序,采用蛋白功能预测软件SIFT、PolyPhen2和REVEL进行变异致病性的预测。结果该家系共有3代9人,4人患病,所有患者均有不同程度的听力损失;先证者(III-3)、其姐姐(III-1)和其母亲(II-2)均有右侧的肾异常;遗传性耳聋基因芯片检测结果未发现最常见的4个耳聋基因突变;Sanger测序法基因检测结果显示,先证者(III-3)、患者II-2、III-1及III-2的EYA1基因c.889C>T(p.R297X)突变,为无义突变,均为杂合变异,变异来源于II-2,II-1(先证者父亲)未发现该位点的变异。利用蛋白功能预测软件SIFT、PolyPhen2和REVEL进行EYA1基因变异致病性的分析,结果均显示为未知。结论本研究首次检测出中国BOR综合征人群中EYA1基因c.889C>T(p.R297X)位点的致病性突变。展开更多
通过家系调查、临床检查和遗传学特征分析,对一个鳃-耳-肾综合征家系的临床表型及致病原因进行系统研究。该家系表现为常染色体显性遗传,4位先证者均表现为听力损失、鳃裂瘘管、耳前瘘管、肾异常中的两种及以上的混合症状,症状轻重不等...通过家系调查、临床检查和遗传学特征分析,对一个鳃-耳-肾综合征家系的临床表型及致病原因进行系统研究。该家系表现为常染色体显性遗传,4位先证者均表现为听力损失、鳃裂瘘管、耳前瘘管、肾异常中的两种及以上的混合症状,症状轻重不等。遗传性耳聋基因芯片检测未发现常见的耳聋基因突变,sanger法基因检测结果显示4位先证者的EYA1基因c.889C>T(p.R297X)突变,为无义突变且均为杂合变异,根据美国医学遗传学与基因组学学会(American College of Medical Genetics and Genomics,ACMG)指南初步判定为致病性变异,现结合文献报道如下。展开更多
基金supported by the National Natural Science Foundation of China(Nos.81271078,81300827,and 81500791)
文摘Age-related hearing loss（AHL） is one of the most common sensory disorders among elderly persons. The inwardly rectifying potassium channel 5.1（Kir5.1） plays a vital role in regulating cochlear K~＋ circulation which is necessary for normal hearing. The distribution of Kir5.1 in C57BL/6J mice cochleae, and the relationship between the expression of Kir5.1 and the etiology of AHL were investigated. Forty C57BL/6J mice were randomly divided into four groups at 4, 12, 24 and 52 weeks of age respectively. The location of Kir5.1 was detected by immunofluorescence technique. The m RNA and protein expression of Kir5.1 was evaluated in mice cochleae using real-time polymerase-chain reactions（RT-PCR） and Western blotting respectively. Kir5.1 was detected in the type Ⅱ and Ⅳfibrocytes of the spiral ligament in the cochlear lateral wall of C57BL/6J mice. The expression levels of Kir5.1 m RNA and protein in the cochleae of aging C57BL/6J mice were down-regulated. It was suggested that the age-related decreased expression of Kir5.1 in the lateral wall of C57BL/6J mice was associated with hearing loss. Our results indicated that Kir5.1 may play an important role in the pathogenesis of AHL.
文摘目的研究一个鳃-耳-肾综合征(branchio-oto-renal,BOR)家系的临床表型及遗传学特征。方法通过家系调查、临床检查和遗传学特征分析,对一个鳃-耳-肾综合征家系的临床表型及致病原因进行系统研究,提取家系成员的外周血DNA,采用遗传性耳聋基因芯片进行最常见的GJB2(135 del G、176 del 16、299 del AT、235 del C)、GJB3(538 c>T)、SLC26A4(2168A>G、IVS7-2A>G)、mtDNA12SrRNA(1494C>T、1555C>T)4个基因9个耳聋位点检测,利用Sanger法进行基因测序,采用蛋白功能预测软件SIFT、PolyPhen2和REVEL进行变异致病性的预测。结果该家系共有3代9人,4人患病,所有患者均有不同程度的听力损失;先证者(III-3)、其姐姐(III-1)和其母亲(II-2)均有右侧的肾异常;遗传性耳聋基因芯片检测结果未发现最常见的4个耳聋基因突变;Sanger测序法基因检测结果显示,先证者(III-3)、患者II-2、III-1及III-2的EYA1基因c.889C>T(p.R297X)突变,为无义突变,均为杂合变异,变异来源于II-2,II-1(先证者父亲)未发现该位点的变异。利用蛋白功能预测软件SIFT、PolyPhen2和REVEL进行EYA1基因变异致病性的分析,结果均显示为未知。结论本研究首次检测出中国BOR综合征人群中EYA1基因c.889C>T(p.R297X)位点的致病性突变。
文摘通过家系调查、临床检查和遗传学特征分析,对一个鳃-耳-肾综合征家系的临床表型及致病原因进行系统研究。该家系表现为常染色体显性遗传,4位先证者均表现为听力损失、鳃裂瘘管、耳前瘘管、肾异常中的两种及以上的混合症状,症状轻重不等。遗传性耳聋基因芯片检测未发现常见的耳聋基因突变,sanger法基因检测结果显示4位先证者的EYA1基因c.889C>T(p.R297X)突变,为无义突变且均为杂合变异,根据美国医学遗传学与基因组学学会(American College of Medical Genetics and Genomics,ACMG)指南初步判定为致病性变异,现结合文献报道如下。
