简介:TheGJB2gene(connexin26)hasbeenshowntoberesponsibleforDFNB1andDFNA3.WescreenedtheGJB2genein488patientswithprelingualdeafness(Group1),124withpostlingualdeafness(Group2),and117normalhearingsubjects(Group3).Wefoundthat,inGroup1,65patients(13.32%)werehomozygotesorcompoundheterozygotesand51patients(10.45%)carriedasinglepathogenicmutation.The235delCmutationwasthemostfrequentmutation,accountingfor73.22%oftheknownpathogenicallelesinGroup1.NohomozygotesorcompoundheterozygotesweredetectedinGroup2orGroup3.Somepostlingualdeafpatients(2.42%)andnormalhearingsubjects(4.27%)were235delCcarriers.Ourpreliminarydataindicatethat235delC,themostfrequentmutationidentifiedinthisstudy,isamajorcauseforprelingualdeafness.
简介:目的构建人野生型Cx30与红色荧光蛋白DsRed的融合蛋白表达载体,为揭示Cx30突变患者发病机制提供实验依据。方法用PCR法扩增GJB6基因,将PCR产物与T载体连接,用双切酶酶切pEASY-GJB6与载体DsRed-N1,连接回收后的片断,构建野生型Cx30编码序列与PDsRed2表达载体,测序鉴定序列正确性。将GJB6-DsRed用脂质体转染HEK293细胞,荧光显微镜观察表达的融合蛋白。结果GJB6-DsRed在HEK293细胞中高效表达,表达主要位于细胞膜中。结论成功构建了人野生型Cx30与红色荧光蛋白DsRed的融合蛋白表达载体,为进一步研究非综合征性聋的致聋机制奠定了基础。
简介:MutationsinGJB2genearethemostfrequentlyfoundmutationsinpatientswithnonsyndromichearingimpairment.However,thespectrumandprevalenceofmutationsinthisgenevaryamongdifferentethnicgroups.InChina,30,000infantsarebornwithcongenitalhearingimpairmentannually.Inordertoprovideappropriategenetictestingandcounselingtothefamilies,weinvestigatedthemolecularetiologyofnonsyndromicdeafnessin103unrelatedschoolchildrenattendingNantongSchoolfortheDeafandMuteinJiangsuProvince,China.ThecodingexonoftheGJB2genewasPCRamplifiedandsequenced.SixtytwoGJB2mutantalleleswereidentifiedin35.9%(37/103)ofthepatients.Twentyfivepatientscarriedtwopathogenicmutationsand12patientscarriedonemutantallele.The235delCwasthemostcommonmutationaccountingfor69.4%(43/62)ofGJB2mutantalleles.TheGJB2mutantallelesaccountedfor30.1%(62/206)ofallchromosomesresponsiblefornonsyndromichearingimpairment.Testingofthe3mostprevalentdeleteriousframeshiftmutationsinthiscohortdetected100%ofallGJB2mutantalleles.TheseresultsdemonstratethataneffectivegenetictestingofGJB2geneforpatientsandfamilieswithnonsyndromichearingimpairmentispossible.
简介:ObjectiveToinvestigateGJB2mutationprevalencesintheUigurandHanethnicgroupsinXinjiang,China,anddeterminetherelationshipbetweenethnicityandGJB2genemutations.MethodsInformationregardingethnicityofpatients'familieswasobtainedthroughmedicalrecordsreviewand/orpatientinterview.Bloodsampleswerecollectedfrom61Uigursand66Hansfordirectsequencingofthecodingregionandintron/exonboundariesoftheGBJ2gene.ResultsCarrierfrequencyofGJB2mutationswassimilarbetweentheUigurandHansubjects.TheGJB235delGmutationwasseenonlyinUigurpatientswithhearingloss,whereasthe235delCmutationwasidentifiedinbothUigurandHanpatients.TheallelicFrequencyof35delGmutationwas7.4%(9/122)inUigurdeafstudents,butnoneinHandeafstudents(0/128)andUigurcontrols(0/196).TheallelicfrequencyofGJB2235delCmutationinUigurandHandeafstudentswas5.7%and9.8%,andthatof299-300delATmutationwas0.8%and5.5%,respectively.V27IandE114Gwerethemostfrequenttypesofpolymorphism.ConclusionWefoundanAsian-specificGJB2diversityamongUigurs,andcomparableGJB2contributiontodeafnessinUigurandHanpatients.Thehighcarrierfrequencyof35delGinUigurs(11.5%)isprobablydefinedbygenedrift/foundereffectinaparticulargroup.EventhoughGJB2mutationshavebeenwidelyreportedintheliterature,thisdiscussionrepresentsthefirstreportofGJB2mutationsinChinesemulti-ethnicpopulations.
简介:MutationsintheGJB2genearethemostfrequentlyfoundmutationsinpatientswithnonsyndromichearingimpairment.However,themutationspectrumandprevalenceofmutationsvaryamongdifferentethnicgroups.Everyyear,30,000babiesarebornwithcongenitalhearingimpairmentinChina.Inordertoprovideappropriategenetictestingandcounselingtothefamily,weinvestigatedthemolecularetiologyofnonsyndromicdeafnessin135unrelatedschoolchildrenattendingChifengMunicipalSpecialEducationSchoolinInnerMongolia,China.ThecodingexonoftheGJB2genewasPCRamplifiedandsequenced.Inaddition,the12SrRNAgeneandtRNAser(UCN)ofmitochondrialgenomewerescreenedformutationsresponsibleforhearingimpairment.SixtyfourGJB2mutantalleles,including60confirmedpathogenicallelesand4unclassifiedvariants,wereidentifiedin31.1%(42/135)ofthesubjects.Twentytwosubjectscarriedtwopathogenicmutationsand20subjectscarriedonemutantallele,includingonesubjectwithoneautosomaldominantmutation.The235delCwasthemostcommonmutationaccountingfor65.6%(42/64)GJB2mutantalleles.WhencomparedtootherAsianpopulations,oursubjectcohorthadhigherfrequencyof235delCmutationthantheJapanesepopulation.TheGJB2mutantallelesaccountfor23.7%(64/270)ofallchromosomesresponsiblefornonsyndromichearingimpairment.Testingofthe4mostprevalentdeleteriousframeshiftmutations(235delC,299_300delAT,176_191del16,and560_605ins46)inthiscohortdetected90%ofallGJB2mutantalleles.TheseresultsdemonstratethateffectivegenetictestingoftheGJB2geneforpatientsandfamilieswithnonsyndromichearingimpairmentispossibleintheChinesepopulation.Sincethemostcommon309kbGJB6deletionisnotdetectedandonlyone1555A>GmutationinmitochondrialDNAisdetectedinourpatients,investigationofmutationsinothernucleargenesand/orenvironmentalfactorsresponsiblefornonsyndromichearingimpairmentintheChinesepopulationis
简介:目的构建6种分别携带GJB2基因错义突变A40G、V37I、L90P、L90V、V84L和W44C的真核表达载体,转染HEK293细胞,建立6种错义突变的稳定表达细胞系。方法以野生型Cx26-EGFP融合蛋白质粒为模板,用Stratagene公司定点突变试剂盒构建错义突变表达载体,直接测序鉴定序列正确性,选取含有突变的载体转染HEK293细胞,G418选择性培养2周,流式细胞仪筛选表达阳性细胞,扩增培养形成稳定表达人Cx26突变的HEK293细胞系。培养细胞用4%多聚甲醛固定,鬼笔环肽和4',6-二脒基-2-苯基吲哚衬染细胞核,荧光显微镜下检测结果。结果6种突变表达载体经过测序,均含有相应突变,无多余突变出现,转染后均可在细胞间形成缝隙连接,呈现绿色荧光。结论成功构建6种携带GJB2基因错义突变的真核表达载体,为进一步研究错义突变致聋原因奠定了实验基础。
简介:Objective:Todeterminewhetheranew-bornchildfromafamilycarryingadeafnessgeneneedscochlearimplantationtoavoiddysphoniabyscreeningandsequencingadeafness-relatedgene.Results:BothscreeningandsequencingresultsconfirmedthatthenewbornchildhadanormalGJB2genedespitethefactthatshehasabrothersufferingfromhearinglosstriggeredbyanallelicGJB2c.176del16mutation.WeclonedtheGJB2genesderivedfromtheirrespectivebloodgenomicDNAintoGFPfusedplasmidsandtransfectedthoseplasmidsintothe293Tcelllinetotestforgenefunction.WhilethemutatedGJB2gene(GJB2c.176del16)ofherdeafbrotherwasfoundtobeunabletoformthegapjunctionstructurebetweentwoadjacentcells,thebabygirl’sGJB2generanintonosuchproblems.Conclusion:ThescreeningandsequencingaswellastheGJB2genefunctiontestsinvariablyshowedresultsconsistentwiththeABRtestedhearingphenotype,whichmeansthatthechild,withanormalwildtypeGJB2gene,doesnotneedearlyinterventiontopreventherfromdevelopinghearinglossanddysphoniaatalaterstageinlife.
简介:目的连接蛋白基因和遗传性耳聋及角皮病有明确的相关性.现有4个连接蛋白基因突变可导致角皮病,即:GJB4、GJB2、GJB3和GJB6,其中3个基因既可导致遗传性耳聋,即GJB2、GJB3和GJB6,而GJB4是否与遗传性耳聋相关还有待于进一步证实.为证实GJB4和遗传性耳聋的相关性,在非综合征型遗传性耳聋中进行突变检测.方法本实验采用PCR-直接测序法对60个非综合征型遗传性耳聋家系先证者进行GJB4的突变检测,其中32个显性遗传,28个隐性遗传.结果发现了四种碱基改变:109G>A、3'UTR+17A>G、611A>C和507C>G.109G>A和3'UTR+17A>G是新发现的碱基改变,但在家系突变检测中证实为多态.611A>C和507C>G两种碱基改变是已报道的多态,611A>C是我们检测到的最常见的多态.结论本研究发现了GJB4的109G>A和3'UTR+17A>G两种新多态,为今后进一步研究打下了基础,但未能最终证实GJB4为遗传性耳聋的致病基因,可是从该基因背景来分析GJB4仍可能是一个很好的耳聋候选基因,有待于扩大家系收集范围进一步检测.
简介:目的研究南通地区非综合征性耳聋GJB2基因突变情况。方法收集南通地区海安县和如皋县聋哑学校学生100名和健康对照组50名,利用PCR扩增及限制性内切酶酶切分析初筛GJB2235delC突变者,然后再行DNA直接测序。结果耳聋组中共发现三种突变:235delC、176—191del16、299—300delAT。235delC是主要突变方式.约30%的患者携带此突变;299—300delAT和176-191del16突变检出率分别为9%和8%。对照组未发现这些突变。结论南通地区非综合征性耳聋GJB2基因突变率较高,因此在南通地区进行广泛的生育前耳聋基因筛查工作有重要意义。
简介:目的分析在中国西北地区耳聋家系人群与散发人群之间GJB2基因突变频率的差异性,探讨GJB2基因突变在西北地区耳聋家系人群中的发生频率及其特点。方法收集中国西北地区29个家系的87例耳聋患者、散发非综合征型感音神经性耳聋患者169例及听力正常人117例血样,提取外周血DNA后,进行聚合酶链反应扩增GJB2基因编码区,将扩增产物进行直接测序。运用DNAStar5.0软件进行测序结果分析,对各组GJB2基因突变频率进行统计学分析。结果87例家系耳聋患者中存在GJB2致病突变28例,占32.18%;169例散发耳聋患者中GJB2基因致病突变24例,占14.20%;117例正常对照人群发现GJB2基因突变携带者5例,占4.27%。结论GJB2基因突变在中国西北地区家系耳聋患者与散发耳聋人群的发生频率存在统计学差异(χ2=11.474,P<0.05),对存在GJB2基因突变的耳聋患者进一步对其家系成员重点进行该基因的突变筛查具有重要意义。
简介:目的探讨携带GJB2基因单杂合突变非综合征型耳聋患者GJA1基因突变情况.方法对205例GJB2单杂合突变的非综合征型耳聋患者进行GJA1外显子2直接测序,对照组为111例听力正常成年人.结果205例GJB2单杂合突变患者中,GJA1c.IVS2+1insA杂合突变3例(1.45%),c.456G〉A和c.717G〉A各1例,都为杂合同义突变.111例对照组中,c.IVS2+1insA杂合突变3例(2.70%),c.466A〉G杂合突变1例.两组c.IVS2+1insA突变率无明显差异(校正χ2=0.115,P=0.735〉0.05).结论GJB2单杂合突变非综合征型耳聋患者中GJA1检测未见致病突变.
简介:目的调查新疆乌鲁木齐市聋哑学校重度感音性耳聋分子流行病学情况。方法对194例聋哑学生进行临床资料采集,外周静脉血抽取。血样经DNA提取,进行GJB2235delC突变、线粒体DNA12SrRNAA1555G突变的检测。结果194例聋哑学生中,GJB2235delC纯合突变、235delC杂合突变携带率分别为为5.67%(11/194)、5.67%(11/194),mtDNAA1555G点突变检出率为9.28%(18/194)。GJB2235delC在汉族、维族、回族聋哑学生中的等位基因频率分别为9.51%(27/284)、6.0%(3/50)、3.13%(1/32);携带mtDNAA1555G点突变的聋哑学生16人为汉族、1人为维族、1人为回族。结论新疆三个主要民族聋哑学生群体中GJB2235delC、A1555G突变检出率均以汉族最高,但三个民族的突变检出率经统计学比较无显著性差异。新疆地区聋哑学生的GJB2235deIC突变检出率在全国处于较低水平,新疆地区聋哑学生的A1555G突变检出率高。
简介:目的分析不同听力水平的中老年人GJB2基因的突变类型和基因型频率,探讨GJB2基因的各种突变和单核苷酸多态(SNPs)是否与年龄相关性耳聋的遗传易感性相关联。方法通过普查共收集到648例中老年人的听力学资料和血样,根据听力学检查结果将其分为四组。提取基因组DNA,经聚合酶链反应(Polymerasechainreaction,PCR)扩增GJB2基因编码区,利用直接测序方法获得所有样本的基因型,区分致病突变和多态性改变,利用统计学分析方法研究各种突变和多态在各组的分布情况。结果根据听力学结果将所有样本分为四组:正常对照组(157人)、轻度听力下降组(199人)、中度听力下降组(226人)、重度听力下降组(66人)。通过直接测序的方法,发现4种移码突变,包括235delC杂合突变16例、299-300delAT杂合突变3例、176-191del16杂合突变1例、512insAACG杂合突变2例;1种错义突变109G>A;6种多态,包括79G>A、341A>G、608T>C、457G>A、368C>A、571T>C;3种已报道但与疾病关系不确定的突变11G>A、187G>T、558G>A;5种没有报道过的突变...
简介:NuclearfactorkappaB(NF-κB)isoneofthebest-characterizedtranscriptionfactorsplayingimportantrolesinmanycellularresponsestoalargevarietyofstimuli,includinginflammatorycytokines,phorbolesters,growthfactors,andbacterialandviralproducts.TheaimofthisstudyistodemonstrateNF-κBexpressioninthemousecochleaanditsenhancementinresponsetolipopolysaccharides(LPS)andkanamycin(KA)treatment.MethodsKAtreatmentconsistedofsubcutaneousKAinjectionsat700mg/kgtwiceadaywithaneight-hourintervalbetweenthetwoinjectionsfor3or7days.ForanimalsintheLPStreatmentgroup,asingledoseof0.3mgLPSdissolvedin0.2mlsterilesalinewereinjectedintobothbullaethroughthetympanicmembraneandkepttherefor3hours.Animalsinthecontrolgroupreceivedsubcutaneoussalineinjectionfor7days.Followingimmmunohistochemichalprocessingwithrabbitpolyclonalanti-NF-κBp65antibodies,cryosectionsofthecochleawereexaminedforexpressionofNF-κBp65invariousstructuresinthecochlea.ResultsNF-κBp65expression,identifiedbypresenceofbrownreactionproductscharacteristicofDABimmunohistochemistry,wasvisibleinthespiralligament,spiralprominence,tectorialmembrane(TM),spiralganglionandnervefibers.RelativelyweakNF-κBp65expressionwasalsovisualizedintheorganofCorti.WithintheorganofCorti,theinnerhaircells(IHC),outerhaircells(OHC),innerpillarcells(IP),outerpillarcells(OP),Deiter'scells(DC),andBoettcher'scellsexhibitedstrongerstainingthantheinnersulcuscells,Hensen'scells(HC)andClaudius'cells.NoNF-κBp65expressionwasseeninthenucleusoftheIHCandOHC.NF-κBp65expressionwasincreasedinanimalsexposedtoLPSorKA,demonstratingsignificantdifferencesinthestainingbetweencontrolanimalsandLPS/KA-treatedanimals.NF-κBp65expressionwasnotsignificantlydifferentbetweenLPStreatedandKAtreatedanimalsorbetween3and7daysinKA-treatedanimals.Conclusio
简介:目的评价通过B超测量面肌厚度的方法诊断面肌萎缩的可行性,并测量青年人面肌厚度的正常值,分析面肌厚度正常值的相关因素。方法选取34名健康青年志愿者,记录所有志愿者的年龄、性别、身高、体重及头围5种相关因素,用B超按设定方法测量每位志愿者双侧的额肌、降口角肌和降口唇肌,对测量结果及5种相关因素进行统计学分析。并从34名志愿者中随机选取5名,在1周后和2周后分别重复测量3组面肌,比较3次测量结果有无差异。结果①34名志愿者经B超测量3组面肌厚度,双侧额肌、降嗣角肌和降口唇肌厚度无显著差异(P〉0.05)。面肌厚度平均值为:额肌左侧(1.60±0.21)mm,右侧(1.62±0.22)mm;降口角肌左侧(2.60±0.50)mm,右侧(2.62±0.51)mm;降口唇肌左侧(1.51±0.23)mm,右侧(1.52±0.23)mm。②随机选取的五5名志愿者重复测量3次,3次面肌厚度测量结果相近,无统计学差异(P〉0.05)。③按性别分组,女性18例,男性16例,组间比较:男性3组面肌厚度大于女性,差异有统计学意(P〈0.05)。④体重指数与所测量的3块面肌厚度呈正相关性(P〈0.05),额肌、降日角肌、降口屠肌与体重指数的相关系数分别为0.391、0.459及0.447;头围与面肌厚度无明显相关性。⑤选定的年龄段内(20-30岁)3组面肌厚度与年龄无相关性(P〉0.05)。证明20-30岁年龄段的青年人,面肌厚度不受年龄影响,该年龄段人群面肌厚度具有相对稳定性。结论①B超测量面肌厚度具有可重复性和很好的稳定性;②正常青年人(20-30岁)双侧额肌、降口角肌和降口唇肌厚度无明显差异:③不同性别的正常青年人(20-30岁)面肌厚度有明显差异,男性的额肌、降口角肌、降口唇肌均较女性厚;④正常青年人(20-30岁)面肌厚度跟体重指数呈正�
简介:目的分析武汉地区非综合征性耳聋(nonsyndromichearingimpairment,NSHI)患儿GJB2235delC突变率和线粒体DNAA1555G突变率。方法收集武汉市艺萌听力康复中心的94例耳聋患儿血样,非综合征性耳聋患儿88例,提取DNA后经聚合酶链反应(PCR)分别扩增GJB2基因编码区及线粒体DNA,ApaI酶切分析GJB2235位点的C缺失突变,Prev—DAF药物性耳聋基因诊断试剂盒分析线粒体1555位点的A—G突变,对GJB2235ddC及线粒体DNAA1555G的突变率进行统计分析。结果88例患儿中9例(10.23%)为GJB2235delC纯合突变,7例(7.96%)为GJB2235delC杂合突变;2例(2.27%)存在线粒体DNAA1555G点突变。在分子水平能够明确诊断者占20.46%。结论武汉地区耳聋患者存在较高的遗传性耳聋发生率,应用基因诊断技术可以在耳聋患者病因调查中进行快速诊断筛查,达到防止再生育聋儿、指导聋儿康复等积极效果。
简介:目的分析GJB2235delC突变和线粒体DNA12SrRNAA1555G突变在广西壮族自治区柳州地区非综合征性耳聋(nonsyndromichearingimpairment,NSHI)患儿中的作用。方法收集广西壮族自治区柳州聋哑学校的88例非综合征性耳聋患儿的血样,提取DNA后经聚合酶链反应(PCR)分别扩增GJB2基因编码区及线粒体DNA,ApaI酶切分析GJB2235位点的C缺失突变、Prey—DAF药物性耳聋基因诊断试剂盒分析线粒体1555位点的A—G突变,对GJB2235delC及线粒体DNA12SrRNAA1555G的突变率进行统计分析。结果88例患儿中1例(1.14%)为GJB2235delC纯合突变;5例(5.68%)为GJB2235delC杂合突变;4例(4.55%)存在线粒体DNA12SrRNAA1555G点突变,其中1例同时伴有GJB2235delC杂合突变。在分子水平能够明确诊断者占11.37%。结论柳州地区耳聋患者常染色体隐性遗传性耳聋发生率较全国平均水平低,线粒体DNA12SrRNAA1555G突变发生率偏高。应用基因诊断技术可以在地区性耳聋病因调查中进行快速筛查、诊断,可达到防止聋儿再生、指导聋儿康复等积极效果。