Single nucleotide polymorphisms and haplotypes analysis of DFNB1 locus in Chinese sporadic hearing impairment population

Background The DFNB1 locus, which contains the gap junction beta-2 (GJB2) and gap junction beta-6 (GJB6) genes, plays a key role in the nonsyndromic and sporadic hearing impairment. Mutations of DFNB1 result in autosomal recessive nonsyndromic hearing impairment (ARNSHI). Previous researches have identified mutations in GJB2 and GJB6, but single nucleotide polymorphisms (SNPs) of DFNB1 locus have not been studied. So we chose five SNPs to evaluate whether there is difference between deafness people and normal-hearing people in Han Chinese. Methods Five SNPs in the DFNB1 region were examined using a case-control association study between cases with sporadic hearing impairment and controls with normal hearing. The HWEsoft and SHEsis softwares were used to analyze the results.Results Single-locus association analysis showed a positive association for three SNPs: rs9315400, rs2274084 and 235delC. When we compared the distributions of the haplotypes, we also found significant differences between cases and controls in the haplotype combination of rs2274084 and rs2274083 (X2=12.978, df=3, global P=0.004719).Conclusions The haplotypes composed of rs2274084 and rs2274083 suggested that C-C may be a risk haplotype for the sporadic hearing impairment while T-T may be protective against hearing impairment. From that point of view, we can conclude that the SNPs of DFNB1 locus also plays an important role in sporadic hearing impairment cases.     

Single nucleotide polymorphisms and haplotypes analysis of DFNB1 locus in Chinese sporadic hearing impairment population

Background The DFNB1 locus, which contains the gap junction beta-2 (GJB2) and gap junction beta-6 (GJB6) genes, plays a key role in the nonsyndromic and sporadic hearing impairment. Mutations of DFNB1 result in autosomal recessive nonsyndromic hearing impairment (ARNSHI). Previous researches have identified mutations in GJB2 and GJB6, but single nucleotide polymorphisms (SNPs) of DFNB1 locus have not been studied. So we chose five SNPs to evaluate whether there is difference between deafness people and normal-hearing people in Han Chinese. Methods Five SNPs in the DFNB1 region were examined using a case-control association study between cases with sporadic hearing impairment and controls with normal hearing. The HWEsoft and SHEsis softwares were used to analyze the results.Results Single-locus association analysis showed a positive association for three SNPs: rs9315400, rs2274084 and 235delC. When we compared the distributions of the haplotypes, we also found significant differences between cases and controls in the haplotype combination of rs2274084 and rs2274083 (X2=12.978, df=3, global P=0.004719).Conclusions The haplotypes composed of rs2274084 and rs2274083 suggested that C-C may be a risk haplotype for the sporadic hearing impairment while T-T may be protective against hearing impairment. From that point of view, we can conclude that the SNPs of DFNB1 locus also plays an important role in sporadic hearing impairment cases.     

Single nucleotide polymorphisms and haplotypes analysis of DFNB1 locus in Chinese sporadic hearing impairment population

Background The DFNB1 locus, which contains the gap junction beta-2 (GJB2) and gap junction beta-6 (GJB6) genes, plays a key role in the nonsyndromic and sporadic hearing impairment. Mutations of DFNB1 result in autosomal recessive nonsyndromic hearing impairment (ARNSHI). Previous researches have identified mutations in GJB2 and GJB6, but single nucleotide polymorphisms (SNPs) of DFNB1 locus have not been studied. So we chose five SNPs to evaluate whether there is difference between deafness people and normal-hearing people in Han Chinese. Methods Five SNPs in the DFNB1 region were examined using a case-control association study between cases with sporadic hearing impairment and controls with normal hearing. The HWEsoft and SHEsis softwares were used to analyze the results.Results Single-locus association analysis showed a positive association for three SNPs: rs9315400, rs2274084 and 235delC. When we compared the distributions of the haplotypes, we also found significant differences between cases and controls in the haplotype combination of rs2274084 and rs2274083 (X2=12.978, df=3, global P=0.004719).Conclusions The haplotypes composed of rs2274084 and rs2274083 suggested that C-C may be a risk haplotype for the sporadic hearing impairment while T-T may be protective against hearing impairment. From that point of view, we can conclude that the SNPs of DFNB1 locus also plays an important role in sporadic hearing impairment cases.     

Single nucleotide polymorphisms and haplotypes analysis of DFNB1 locus in Chinese sporadic hearing impairment population

Background The DFNB1 locus, which contains the gap junction beta-2 (GJB2) and gap junction beta-6 (GJB6) genes, plays a key role in the nonsyndromic and sporadic hearing impairment. Mutations of DFNB1 result in autosomal recessive nonsyndromic hearing impairment (ARNSHI). Previous researches have identified mutations in GJB2 and GJB6, but single nucleotide polymorphisms (SNPs) of DFNB1 locus have not been studied. So we chose five SNPs to evaluate whether there is difference between deafness people and normal-hearing people in Han Chinese. Methods Five SNPs in the DFNB1 region were examined using a case-control association study between cases with sporadic hearing impairment and controls with normal hearing. The HWEsoft and SHEsis softwares were used to analyze the results.Results Single-locus association analysis showed a positive association for three SNPs: rs9315400, rs2274084 and 235delC. When we compared the distributions of the haplotypes, we also found significant differences between cases and controls in the haplotype combination of rs2274084 and rs2274083 (X2=12.978, df=3, global P=0.004719).Conclusions The haplotypes composed of rs2274084 and rs2274083 suggested that C-C may be a risk haplotype for the sporadic hearing impairment while T-T may be protective against hearing impairment. From that point of view, we can conclude that the SNPs of DFNB1 locus also plays an important role in sporadic hearing impairment cases.     

Single nucleotide polymorphisms and haplotypes analysis of DFNB1 locus in Chinese sporadic hearing impairment population

Background The DFNB1 locus, which contains the gap junction beta-2 (GJB2) and gap junction beta-6 (GJB6) genes, plays a key role in the nonsyndromic and sporadic hearing impairment. Mutations of DFNB1 result in autosomal recessive nonsyndromic hearing impairment (ARNSHI). Previous researches have identified mutations in GJB2 and GJB6, but single nucleotide polymorphisms (SNPs) of DFNB1 locus have not been studied. So we chose five SNPs to evaluate whether there is difference between deafness people and normal-hearing people in Han Chinese. Methods Five SNPs in the DFNB1 region were examined using a case-control association study between cases with sporadic hearing impairment and controls with normal hearing. The HWEsoft and SHEsis softwares were used to analyze the results.Results Single-locus association analysis showed a positive association for three SNPs: rs9315400, rs2274084 and 235delC. When we compared the distributions of the haplotypes, we also found significant differences between cases and controls in the haplotype combination of rs2274084 and rs2274083 (X2=12.978, df=3, global P=0.004719).Conclusions The haplotypes composed of rs2274084 and rs2274083 suggested that C-C may be a risk haplotype for the sporadic hearing impairment while T-T may be protective against hearing impairment. From that point of view, we can conclude that the SNPs of DFNB1 locus also plays an important role in sporadic hearing impairment cases.     

Single nucleotide polymorphisms and haplotypes analysis of DFNB1 locus in Chinese sporadic hearing impairment population

Background The DFNB1 locus, which contains the gap junction beta-2 (GJB2) and gap junction beta-6 (GJB6) genes, plays a key role in the nonsyndromic and sporadic hearing impairment. Mutations of DFNB1 result in autosomal recessive nonsyndromic hearing impairment (ARNSHI). Previous researches have identified mutations in GJB2 and GJB6, but single nucleotide polymorphisms (SNPs) of DFNB1 locus have not been studied. So we chose five SNPs to evaluate whether there is difference between deafness people and normal-hearing people in Han Chinese. Methods Five SNPs in the DFNB1 region were examined using a case-control association study between cases with sporadic hearing impairment and controls with normal hearing. The HWEsoft and SHEsis softwares were used to analyze the results.Results Single-locus association analysis showed a positive association for three SNPs: rs9315400, rs2274084 and 235delC. When we compared the distributions of the haplotypes, we also found significant differences between cases and controls in the haplotype combination of rs2274084 and rs2274083 (X2=12.978, df=3, global P=0.004719).Conclusions The haplotypes composed of rs2274084 and rs2274083 suggested that C-C may be a risk haplotype for the sporadic hearing impairment while T-T may be protective against hearing impairment. From that point of view, we can conclude that the SNPs of DFNB1 locus also plays an important role in sporadic hearing impairment cases.     

Single nucleotide polymorphisms and haplotypes analysis of DFNB1 locus in Chinese sporadic hearing impairment population

Background The DFNB1 locus, which contains the gap junction beta-2 (GJB2) and gap junction beta-6 (GJB6) genes, plays a key role in the nonsyndromic and sporadic hearing impairment. Mutations of DFNB1 result in autosomal recessive nonsyndromic hearing impairment (ARNSHI). Previous researches have identified mutations in GJB2 and GJB6, but single nucleotide polymorphisms (SNPs) of DFNB1 locus have not been studied. So we chose five SNPs to evaluate whether there is difference between deafness people and normal-hearing people in Han Chinese. Methods Five SNPs in the DFNB1 region were examined using a case-control association study between cases with sporadic hearing impairment and controls with normal hearing. The HWEsoft and SHEsis softwares were used to analyze the results.Results Single-locus association analysis showed a positive association for three SNPs: rs9315400, rs2274084 and 235delC. When we compared the distributions of the haplotypes, we also found significant differences between cases and controls in the haplotype combination of rs2274084 and rs2274083 (X2=12.978, df=3, global P=0.004719).Conclusions The haplotypes composed of rs2274084 and rs2274083 suggested that C-C may be a risk haplotype for the sporadic hearing impairment while T-T may be protective against hearing impairment. From that point of view, we can conclude that the SNPs of DFNB1 locus also plays an important role in sporadic hearing impairment cases.     

Single nucleotide polymorphisms and haplotypes analysis of DFNB1 locus in Chinese sporadic hearing impairment population

Background The DFNB1 locus, which contains the gap junction beta-2 (GJB2) and gap junction beta-6 (GJB6) genes, plays a key role in the nonsyndromic and sporadic hearing impairment. Mutations of DFNB1 result in autosomal recessive nonsyndromic hearing impairment (ARNSHI). Previous researches have identified mutations in GJB2 and GJB6, but single nucleotide polymorphisms (SNPs) of DFNB1 locus have not been studied. So we chose five SNPs to evaluate whether there is difference between deafness people and normal-hearing people in Han Chinese. Methods Five SNPs in the DFNB1 region were examined using a case-control association study between cases with sporadic hearing impairment and controls with normal hearing. The HWEsoft and SHEsis softwares were used to analyze the results.Results Single-locus association analysis showed a positive association for three SNPs: rs9315400, rs2274084 and 235delC. When we compared the distributions of the haplotypes, we also found significant differences between cases and controls in the haplotype combination of rs2274084 and rs2274083 (X2=12.978, df=3, global P=0.004719).Conclusions The haplotypes composed of rs2274084 and rs2274083 suggested that C-C may be a risk haplotype for the sporadic hearing impairment while T-T may be protective against hearing impairment. From that point of view, we can conclude that the SNPs of DFNB1 locus also plays an important role in sporadic hearing impairment cases.     

Single nucleotide polymorphisms and haplotypes analysis of DFNB1 locus in Chinese sporadic hearing impairment population

Background The DFNB1 locus, which contains the gap junction beta-2 (GJB2) and gap junction beta-6 (GJB6) genes, plays a key role in the nonsyndromic and sporadic hearing impairment. Mutations of DFNB1 result in autosomal recessive nonsyndromic hearing impairment (ARNSHI). Previous researches have identified mutations in GJB2 and GJB6, but single nucleotide polymorphisms (SNPs) of DFNB1 locus have not been studied. So we chose five SNPs to evaluate whether there is difference between deafness people and normal-hearing people in Han Chinese. Methods Five SNPs in the DFNB1 region were examined using a case-control association study between cases with sporadic hearing impairment and controls with normal hearing. The HWEsoft and SHEsis softwares were used to analyze the results.Results Single-locus association analysis showed a positive association for three SNPs: rs9315400, rs2274084 and 235delC. When we compared the distributions of the haplotypes, we also found significant differences between cases and controls in the haplotype combination of rs2274084 and rs2274083 (X2=12.978, df=3, global P=0.004719).Conclusions The haplotypes composed of rs2274084 and rs2274083 suggested that C-C may be a risk haplotype for the sporadic hearing impairment while T-T may be protective against hearing impairment. From that point of view, we can conclude that the SNPs of DFNB1 locus also plays an important role in sporadic hearing impairment cases.     

Single nucleotide polymorphisms and haplotypes analysis of DFNB1 locus in Chinese sporadic hearing impairment population

Background The DFNB1 locus, which contains the gap junction beta-2 （GJB2） and gap junction beta-6 （GJB6） genes, plays a key role in the nonsyndromic and sporadic hearing impairment. Mutations of DFNB1 result in autosomaJ recessive nonsyndromic hearing impairment （ARNSHI）. Previous researches have identified mutations in GJB2 and GJB6, but single nucleotide polymorphisms （SNPs） of DFNB1 locus have not been studied. So we chose five SNPs to evaluate whether there is difference between deafness people and normal-hearing people in Han Chinese. Methods Five SNPs in the DFNB1 region were examined using a case-control association study between cases with sporadic hearing impairment and controls with normal hearing. The HWEsoft and SHEsis softwares were used to analyze the results. Results Single-locus association analysis showed a positive association for three SNPs： rs9315400, rs2274084 and 235delC. When we compared the distributions of the haplotypes, we also found significant differences between cases and controls in the haplotype combination of rs2274084 and rs2274083 （Х^2=12.978, df=3, global P=0.004719）. Conclusions The haplotypes composed of rs2274084 and rs2274083 suggested that C-C may be a risk haplotype for the sporadic hearing impairment while T-T may be protective against hearing impairment. From that point of view, we can conclude that the SNPs of DFNB1 locus also plays an important role in sporadic hearing impairment cases.     

广西汉族人群高血压与瞬时受体电位香草酸亚型1基因多态性/单倍型相关性病例对照研究

目的:分析瞬时受体电位香草酸亚型1(transient receptor potential family vanilloid subtype 1,TRPV1)基因多态性/单倍型与广西地区汉族人群高血压关系,为高血压防控提供依据。方法:以本院心血管内科住院及门诊的汉族高血压患者为病例组,选取本院体检科性别相同、年龄±5岁的汉族成年健康体检者为对照组,对两组人群TRPV1基因8个位点(rs17706630、rs222747、rs222749、rs224534、rs4790521、rs4790522、rs8065080、rs9894618)进行基因分型,并通过SHEsis PL在线平台确定其单倍型。结果:rs8065080位点T等位基因频率病例组高于对照组,两组基因型频率分布相当。两组人群TRPV1基因的rs17706630、rs222747、rs222749、rs224534、rs4790522等5个位点基因型频率和等位基因频率差别无统计学意义。5个位点主要构成7种单倍型,但在两组间分布差别均无统计学意义。结论:尚不能认为广西汉族人群TRPV1基因8个位点(rs17706630、rs222747、rs222749、rs224534、rs4790521、rs4790522、rs8065080、rs9894618)基因型与高血压易感性相关,但部分单倍型可能与高血压易感性有关,需要进一步研究确定。     

非综合征性耳聋基因GJB2突变患儿与铁缺乏的关系探讨

目的 探索非综合征性耳聋患儿基因GJB2突变发生与机体铁缺乏之间的关系.方法 对138例临床诊断为非综合征性耳聋的2岁～10岁患儿及120例同年龄听力正常的健康儿童,均进行GJB2耳聋基因及血清铁、血红蛋白含量检测,并对其结果进行相关性分析.结果 34例存在GJB2基因235de1C突变,其中18例存在235de1C纯合突变,16例存在235de1C杂合突变.非综合征性耳聋患儿组血清铁含量、血红蛋白水平与对照组儿童相比,差异均无统计学意义（均P＞0.05）.聋儿GJB2基因突变组血清铁、血红蛋白检测值与GJB2基因非突变组及正常对照组相比,差异均无统计学意义（均P＞0.05）.结论 非综合征性耳聋GJB2基因突变发生与机体铁缺乏之间无明显相关性,有关铁代谢障碍与感音神经性耳聋发生的机制仍有待于进一步研究.     

河南汉族64例非综合征性耳聋的基因芯片诊断

目的 对河南汉族64例非综合征性耳聋患者进行基因芯片诊断. 方法 对河南汉族64个非综合征性耳聋标本采静脉血提取DNA并进行PCR扩增,与晶芯9项遗传性耳聋基因检测试剂盒的芯片微阵列进行杂交,经过耳聋基因专用软件进行扫描并判读结果. 结果 用耳聋基因芯片对64个样本进行耳聋基因突变检测,GJB2、SLC26A4、线粒体12SrRNA、GJB3基因的9个基因位点检出阳性人数22例,占总筛检人数的34.4％,GJB2基因阳性突变总检出率为10.9％ (7/64),SLC26A4基因阳性突变总检出率18.7％(12/64),GJB3阳性突变检出率3.1％(2/64),线粒体12S rRNA阳性突变检出率为1.6％ (1/64),GJB2和SLC26A4基因突变占总突变的86.4％ (19/22). 结论 中国人常见的4个致聋基因突变在河南省人群中都有一定的检出率,GJB2基因235delC突变和SLC26A4基因的2168A＞G突变是常见的突变方式.     

应用单核苷酸多态性技术筛查2型糖尿病易感基因

目的利用单核苷酸多态性(SNP)标记,在中国北方汉族2型糖尿病相关基因定位区域(1p36.33-p36.23、1q24.3-25.1及1q42.12-42.13)内寻找疾病易感基因位点以及与疾病相关的单倍型.方法通过公共SNP数据库和对样本库全基因测序寻找SNP位点的途径,在定位区域内选择了33个候选基因中的124个SNP位点,用测序法对236例北方汉族散发2型糖尿病患者及152例正常对照个体进行SNP基因分型及病例-对照关联分析,并对具显著性差异的SNP位点进行单倍型分析.结果124个SNP位点中有4个SNP位点的分布频率在病例组和正常对照组存在显著差异(P＜0.05),分别为sAC基因中的rs203849(P=0.005,OR=1.60)和rs203826(P=0.016,OR=1.60),PANK4基因中的rs7535528(P=0.028,OR=1.45)和CASP9基因中的rs884363(P=0.043,OR=1.37).在这4个SNP位点构成的组合型中发现,有2种组合型的频率分布在病例组与对照组之间差异有显著性(P＜0.001).此外,对sAC基因的单倍型分析发现,有4种单倍型与疾病发生相关.结论sAC、PANK4和CASP9基因为中国北方汉族人群2型糖尿病候选易感基因,这3个基因可能在2型糖尿病易感性上有协同作用.     

中国汉族女性中G72基因与精神分裂症的关系

目的 研究在中国汉族女性中NMDA受体途径重要基因G72与精神分裂症的关系。方法 在545名中国汉族女性(精神分裂症患者260例,正常对照285例)中对位于G72基因的3个单核苷酸多态性位点(rs3916965、rs3916967和rs2391191)进行基因分型和连锁不平衡分析。结果 遗传标记rs3916967的等位基因G(P=0.038 6)和rs2391191的等位基因A(P=0.009 6)均与精神分裂症相关。此外,由3个单核苷酸多态性位点构建的单倍型分析表明,单倍型GAG在病例-对照组中表现出统计学差异(P=0.002 4)。结论 在中国汉族女性中,G72基因是精神分裂症的一个重要易感基因,在后续的研究中有必要对本结果进行进一步的验证。     

一个遗传性非综合征型耳聋家系的 GJB2基因突变分析

目的：对1个遗传性非综合征型耳聋家系的临床表型特征进行分析,并选取 GJB2基因进行突变检测。方法详细询问病史和临床检查后,提取患者及家系成员的外周血基因组 DNA ,PCR 扩增 GJB2基因的外显子及外显子和内含子的交界区域,然后对扩增产物进行 DNA 测序和 BLAST 比对进行突变分析。结果该家系所有患者为迟发性、渐进性、早期以高频听力下降为主的感觉神经性聋。 GJB2基因突变分析检测到6种单核苷酸多态,其中 c ．79G ＞ A （p ．Val27Ile）和 c ．341G ＞ A （p ． Glu114Gly）为已知单核苷酸多态,而位于3′‐UTR 的 g ．4159T ＞ C 、g ．5142G／T 、g ．5227G／A 、g ．5352T ／C 突变为本研究新发现。结论该家系未发现 GJB2外显子致病性突变,遗传性非综合征型耳聋存在明显的遗传异质性。     

非综合征性耳聋人工耳蜗植入者基因分析

目的研究连接蛋白26（Connexin26）基因（GJB2）突变和线粒体12S rRNA基因突变在人工耳蜗植入的非综合征性耳聋患者中发生的几率及特性。方法选取100例接受人工耳蜗植入患者,语前聋为96例,语后聋为4例。自外周静脉血中提取总DNA,进行GJB2基因和线粒体12S rRNA基因核苷酸PCR,对扩增的基因片段进行测序,检测GJB2基因突变和线粒体12S rRNA基因突变。结果接受人工耳蜗植入的非综合征性耳聋病例中发现GJB2基因突变率最高,为34％（34／100）。其突变类型主要为235delC,占27％;同时有氨基糖甙类药物使用史的16例病例中发现2例有线粒体12S rRNA基因A1555G突变,1例有线粒体12S rRNA基因突变delT961Cn。结论GJB2基因突变在人工耳蜗植入的患者中发生率最高,235delC是主要突变类型,有氨基糖甙类药物应用史的语后聋患者中线粒体12S rRNA基因突变A1555G为常见突变形式。     

Searching for a schizophrenia susceptibility gene in the 22q11 region

Objective To investigate a genetic association for schizophrenia within chromosome 22ql 1 in a Chinese Han population.Methods The PCR-based restriction fragment length polymorphism (PCR-RFLP) analysis was used to detect three singlen ucleotide polymorphisms (SNPs), rs165655 (A/G base change) and rs165815 (C/T base change) present in the ARVCF(armadillo repeat gene deletion in velocardiofacial syndrome) locus, and rs756656 (A/C base change) in the LOC128979(expressed sequence tags, EST) locus, among 100 Chinese family trios consisting of fathers, mothers and affected offspring with schizophrenia. Genotype data were analyzed by using linkage disequilibrium (LD) methods including haplotype relative risk (HRR) analysis, transmission disequilibrium test (TDT) and haplotype transmission analysis. Results The genotype frequency distributions of three SNPs were all in Hardy-Weinberg equilibrium (P＞0.05). Both the HRR and the TDT analysis showed that rs 165815 was associated with schizophrenia (22=6.447, df=- 1, P=0.011 and X^2=6.313, df=1, P=0.012, respectively),whereas the other two SNPs did not show any allelic association. The haplotype transmission analysis showed a biased transmission for the rs165655-rs165815 haplotype system (X2=17.224, df=3, P=0.0006) and for the rs756656-rs165655-rs165815 hapoltype system (X^2=20.965, df=7, P=0.0038). Conclusion Either the ARVCF gene itself or a nearby locus may confer susceptibility to schizophrenia in a Chinese Han population.     

GJB2 (Cx26) gene mutations in Chinese patients with congenital sensorineural deafness and a report of one novel mutation

Background Mutations in GJB2 gene are a major cause of autosomal recessive congenital hearing loss and the cause in some rare cases of the autosomal dominant form. The purpose of this study was to investigate the frequency and the features of GJB2 mutations in the Chinese patients with congenital sensorineural deafness.Methods Using PCR amplifying the entire coding region of GJB2 gene and direct DNA sequencing to analyze mutations in this gene among unrelated 69 cases with autosomal recessive congenital nonsyndromic deafness and 27 cases of dominant congenital deafness and 35 sporadic cases. We also detected mutations in GJB2 in 100 control subjects with normal hearing.Results 17. 4% (12/69) of the probands in the autosomal recessive, 7. 4% (2/27) of dominant families and 5.7% ( 2/35 ) of the sporadic congenital deafness patients had deafness-causing mutations in GJB2, respectively. Nine types of the mutations in GJB2 were detected in the recessive and sporadic group. They consisted of five types of polymorphism, and four types of deafness-causing mutation with homozygous 35delG in 1 sporadic (1/35), and 235delC frameshift mutation in 1 sporadic (homozygotes) and 10 recessive patients (2 heterozygotes and 8 homozygotes), and homozygous 442G→A missense mutation and homozygous 465T→A nonsense mutation in 1 different recessive proband, respectively. The 465T→A that related to recessive deafness was a novel mutation found by this study. The homozygous (10/69, 14. 5%) and the heterozygous (2/69,2.9%) GJB2 mutation in the recessive patients (12/69, 17.4%) and the homozygotes in the sporadic patient (2/35, 5. 7%) all had congenital severe to profound sensorineural hearing loss.511G→A missense mutation and 299 -300delAT frameshift mutation were found in two autosomal dominant congenital deafness families (2/27, 7.4%). The total mutation frequency of GJB2 was 12.2% (16/131) in the Chinese patients with congenital sensorineural deafness and 235delC was the most common deafness-causing mutation. Six types of mutation-5 types of polymorphism and 1 type of heterozygous deletion (235delC) mutation were found in the 100 control subjects. The carry rate of the most frequent type of mutation 235delC was 0. 5% in the controls(1/200 alleles). 109G→A was the most frequent (15/100, 15%) and 79G→A was the second common (8/100, 8%) polymorphism in this population.Conclusions The general mutation rate of GJB2 is 12.2% (16/131) and the 235delC is the most common type of deafness-causing mutation in Chinese patients with congenital hearing loss. 465T→A nonsense mutation that is associated to autosomal recessive deafness is a novel mutation found by this screening. 511G→A and 299-300delAT mutations contribute to autosomal dominant hearing loss. The study further supports the view that the common types of mutation in GJB2 according to different ethnic background and that the mutation prevalence in the East Asian deafness population is lower than that in the white population.     

GJB2基因突变致聋儿童的人工耳蜗植入效果

背景：基因诊断技术的普及和推广,使得先天性听力障碍的儿童可以检测出致聋基因,其中在人工耳蜗植入患者中GJB2(gap junction protein beta 2,GJB2 )基因突变的发生率为26.5%。本文对31例GJB2基因突变致聋儿童人工耳蜗植入后听觉康复效果进行了随访评估,从而为评价此类患者人工耳蜗植入效果提供参考依据。