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1、24例Wiskott-Aldrich综合征患儿基因型与临床表现型的关系赵琴,蒋利萍,于洁,肖剑文,赵晓东(400014重庆,重庆医科大学附属儿童医院肾脏免疫科)[摘要]目的:分析24例Wiskott-Aldrich综合征(Wiskott-Aldrichsyndrome,WAS)患儿基因型与表现型关系。方法:收集24例WAS患儿临床资料,进行临床表现型评分。流式细胞术检测患儿外周血单个核细胞(peripheralbloodmononuclearcells,PBMCs)WAS蛋白(Wiskott-Aldrichsyndromepro
2、tein,WASP)的表达。对WASP基因进行直接测序,并分析基因型与表现型的关系。结果:24例患儿均系男性,2例临床表现型评分为2分,为X连锁血小板减少症(X-linkedthrombocytopenia,XLT);其余患儿评分均≥3分,为典型WAS。除1例WASP正常表达,2例WASP表达减少外,其余患儿WASP均为阴性。发现WASP基因突变包括7例错义突变,4例无义突变,6例缺失突变,及7例拼接位点突变。共发现基因突变21种,新发突变3种,即180C>T(A49V)、342-343delCA(S103fsX121)、IVS
3、7+2T>C。发现已报道的热点突变6种,包括291G>A(R86H)、291G>T(R86L)、1035delG(G334fsX444)、665C>T(R211X)、IVS6+5G>A、IVS8+1G>A。错义突变患儿2例为XLT,其余均为典型WAS。无义突变、缺失突变及拼接位点突变的患儿均为评分3~5分的典型WAS,部分患儿表现型严重。结论:错义突变患儿表现型多重于国外学者报道,原因尚不清楚。WASP下游区域的基因突变、无义、缺失、拼接位点突变类型则更可能导致WASP表达缺失、不稳定或截短型WASP,临床表型多为典型WAS。环
4、境因素对患儿表现型的影响作用不容小觑,可导致患儿表现型加重。[关键词]Wiskott-Aldrich综合征;WASP表达;基因型;临床表现型[中图法分类号]R725.5[文献标识码]APreliminaryStudyonGenotype-PhenotypeCorrelationin24ChineseWiskott-AldrichSyndromePatientsZhaoQin,JiangLiping,YuJie,XiaoJianwen,ZhaoXiaodong(DivisionofImmunologyandNephrology,C
5、hildren'sHospital,ChongqingMedicalUniversity,Chongqing,400014)[Abstract]Objective:tostudygenotype-phenotypecorrelationpreliminarilyin24ChineseWiskott-Aldrichsyndrome(WAS)patients.Methods:clinicaldataof24ChineseWASpatientswascollected,thenpatients'phenotypeswerescored
6、accordingtointernationalscoringstandards.FlowcytometricwasusedtoanalyseWASprotein(WASP)expressioninperipheralbloodmononuclearcells(PBMCs).WASPgenewasdirectlysequenced,thenthegenotype-phenotypecorrelationwasanalysed.Results:24patientswereallmale,2ofthemwereX-linkedthr
7、ombocytopenia(XLT)withscores2,theotherswereclassicWASwithscores3-5.Onepatient'sWASPpartlyexpressed,two'sexpressionreduced,andtheothers'expressionswerenegative.Wehadfound7missenses,4nonsenses,6deletions,7splicesitemutations.21uniquemutationsweredetected,including3nove
8、lmutationswhichwere180C>T(A49V)、342-343delCA(S103fsX121)、IVS7+2T>C.Therewere6hotspotmutationswerereportedwhichwere291G>A(R86H)、291G