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：ObjectiveToscreenformutationsinmyosin-7Agene(MYO7A)inpatientswithprelingualnonsyndromichearingimpairment.Methods31sporadicpatientswithcongenitalhearingimpairmentand65patientsfrom34familieswithprelingualhereditaryhearingimpairmentinChinaweretestedinthisstudy,and100hearingnormalindividualswereusedascontrol.GenomicDNAisolatedfromwholebloodofallsubjectswassubjectedtopolymerasechainreaction(PCR)toamplifyselectedexonsofMYO7Agene.ThePCRproductsweresubsequentlyscreenedusingsinglestrandconformationalpolymorphismanalysis(SSCP)anddirectsequencingwhenthefragmentsshowedanabnormalelectrophoreticpattern.ResultsGgAtransitionatposition617inexon7,whichwouldproduceanA206Gaminoacidsubstitution,wasdetectedintwopatientsbutinnoneoftheunaffectedmembersinthefamilies.ThisheterozygousmissensemutationhappenedwithinahighlyconservedheptapeptidesequenceofMYO7Aprotein,andiscloselyrelevanttopreligualnonsyndromicdeafness.ConclusionsTheA206Gsubstitutionispossiblyanewmutationtocausepreligualnonsyndromichearingimpairment.Ourresultsprovideevidencethatexon7ofMYO7Aisamutationalhotspotingenetichearingimpairment.

简介：ObjectiveTostudytheefficacyandsafetyoftheJiangTangFangLongJiaoNang(HypoglycemicAnti-DeafnessCapsule)intreatingnon-insulindependentdiabetesmellituswithhearingloss.MethodsTwohundredninetysixpatientswithnon-insulindependentdiabetesmellitusandhearinglosswererandomlyassignedtoatreatmentgroup(n=164,208ears)andacontrolgroup(n=132,184ears).PatientsinthetreatmentgroupweretreatedwiththeJiangTangFangLongJiaoNangandsupplementherbalpreparationsasindicatedbytraditionalChinesemedicinedialecticalassessment,whilecontrolpatientsreceivedglibenclamideandconventionaltreatmentsfordeafness.Hearing,fastingbloodglucose(FBG),post-prandialbloodglucose(PBG),24hoururinesugar,plateletfunctionindices,bloodsuperoxidedismutase(SOD)andlipidperoxides(LPO)levels,andsymptomimprovementwerecomparedbetweenthetwogroups.ResultsTherateofhearingimprovementwas56.7%forthetreatmentgroupand26.6%forthecontrol.FBG,PBGand24hoururinesugarimprovedinbothgroups,butthelasttwoweresuperiorinthetreatmentgroupcomparedtothecontrol.Symptomsimprovementwasalsosuperiorinthetreatmentgroupcomparedtothecontrol.InpatientsreceivingJiangTangFangLongJiaoNangtreatment,plateletfunctionindices,SODandLPOwereallimproved,whileonlyLOPimprovementwasnoticedincontrolpatients.Noacuteorlong-termtoxicitywasdemonstratedfortheJiangTangFangLongJiaoNanginanimaltests.TheJiangTangFangLongJiaoNangloweredbloodglucoseandserumtriglyceridesinaratmodelofalloxan-induceddiabetes.ConclusionTheJiangTangFangLongJiaoNangiseffectiveinimprovinghearinganddiabeticindicesindiabeticpatientswithdeafness,withoutsignificantsideeffects.

简介：ObjectiveChronictinnitusisahighlyprevalentconditionandhasbeenhypothesizedtoresultfromaninnatedisturbanceincentralnervousserotonergictransmission.Giventhefrequentcomorbiditywithmajordepressionandanxiety,wearguethatcandidategenesforthesedisordersarelikelytooverlap.Thepresentstudyaddressesthegeneencodingforthe5-HT1Areceptorasaputativeriskfactorfortinnitus.MethodsIn88subjectswithadiagnosisofchronicsubjectivetinnituswhounderwentadetailedneurootologicalexamination,theentire5-HT1AgenewasamplifiedusingoverlappingPCRproducts.Ampliconswerecustomsequencedbidirectionallyandwerescreenedforvariantsinmultiplealignmentsagainstthehumangenomereference.ResultsWeidentifiedasynonymousC>Texchangeatresidue184(Pro)in7/88subjects,butdetectednomissensevariantsinthepopulationunderstudy.Specifically,thefollowingresidueswerefullyconserved:16(Pro),22(Gly),28(Ile),98(Val),220(Arg),267(Val),273(Gly),and418(Asn).DiscussionThepresentdatacountagainstthecausationofchronictinnitusbyachangeinthe5-HT1Areceptor'saminoacidsequence.However,theallelefrequencyforthe184Prominorallele(0.04)reachedtwicethefrequencyreportedincontrolcohortsfromthesameethnicity.Additionalinvestigationsareinvitedtoclarifytheroleofthe5-HT1Apolymorphisminlargersamples,andtocontrolforcomorbidaffectivedisorders.

简介：Objective:Todeterminewhetheranew-bornchildfromafamilycarryingadeafnessgeneneedscochlearimplantationtoavoiddysphoniabyscreeningandsequencingadeafness-relatedgene.Results:BothscreeningandsequencingresultsconfirmedthatthenewbornchildhadanormalGJB2genedespitethefactthatshehasabrothersufferingfromhearinglosstriggeredbyanallelicGJB2c.176del16mutation.WeclonedtheGJB2genesderivedfromtheirrespectivebloodgenomicDNAintoGFPfusedplasmidsandtransfectedthoseplasmidsintothe293Tcelllinetotestforgenefunction.WhilethemutatedGJB2gene(GJB2c.176del16)ofherdeafbrotherwasfoundtobeunabletoformthegapjunctionstructurebetweentwoadjacentcells,thebabygirl’sGJB2generanintonosuchproblems.Conclusion:ThescreeningandsequencingaswellastheGJB2genefunctiontestsinvariablyshowedresultsconsistentwiththeABRtestedhearingphenotype,whichmeansthatthechild,withanormalwildtypeGJB2gene,doesnotneedearlyinterventiontopreventherfromdevelopinghearinglossanddysphoniaatalaterstageinlife.

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