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SV40T胃壁细胞定位表达转基因小鼠的建立
目的 构建胃壁细胞定位表达SV40T的真核表达载体并制备转基因小鼠动物模型,为研究胃癌发病机制提供动物模型.方法 从构建的胃壁细胞特异性表达载体pcDNA3.1(-)/HKSV中酶切回收3.8kb的基因片段H+-K+ATPase β promoter/SV40T,通过显微注射的方法制备转基因小鼠,PCR和Southern blotting检测阳性转基因小鼠并建系繁殖,RT-PCR检测基因的表达情况.结果 将422枚注射过的受精卵移植给16只假孕雌鼠,共生出77只仔鼠,移植成功率为18.2%.在出生的77只仔鼠中,2#、4#、8#、16#、24#、51#、57#、61#、68#、73#经PCR检测为阳性首建鼠.除68#不育外,其他9个品系首建鼠共生出99只F1代鼠.8#品系23只F1代尚未发现阳性鼠,另8个品系F1代经PCR和Southern blotting检测发现31只阳性鼠,阳性率为40.8%(31/76).RT-PCR检测F1代阳性鼠均仅在胃组织中有SV40T基因的表达,而在心、肝、肾、肺、食道、肠、骨骼肌等组织中均不表达.不育首建鼠处死解剖发现胃组织有肿瘤存在.结论 建立了胃壁细胞定位表达SV40T基因的转基因小鼠动物模型.
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ObjecUve To iovestigate the role of hepatitis C virus (HCV) in the malignant transformation of bile duct celle. Tissues from 6Chinese patients and 6 American patients wtiJl cholengienarcinoma were studied.Mammals RNA was extracted from the selected tumor areas eq formalin-fixed, paraffin embedded sections,followed by reverse transcription double polymerase chain reaction (RT-PCR) and Southern blotting.Results Positive and negative strand HCV RNAsequences were detected in seven out of tweive patients witn choiangiocarcinorna. A high positive rate was found in Chinese patients (83%) as compared to US patients (38%).Coaclualon Our finding suggests HCV may play a role in the malignent transformation of bile duct cells.
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鹅源腺病毒基因组DNA物理图谱的构建
将鹅源腺病毒Y81G4株全基因组DNA的HindⅢ酶切片段分别插入质粒pUC18, 成功构建了全基因组DNA文库.在此基础上,将重组质粒携带的插入片段切出、回收并分别用地高辛标记后作为探针,与经限制酶BamHI、EcoRI、PstI、Eco RV消化的病毒基因组DNA进行Southern Blotting,杂交结果经比较综合后获得了该病毒基因组DNA的HindⅢ、Ba mH I、EcoR I、PstI、EcoR V限制性内切酶的物理图谱.利用已发表的含有鸡EDS76病毒AA-2 株基因组DNA右末端的重组质粒pBE42作为探针,与本病毒两末端重组质粒进行Southern Blo tting,根据同源性杂交结果确定了本病毒基因组DNA物理图谱与EDSVAA-2株相应的方向. 本病毒基础因组DNA物理图谱的精确构建,为进行基因组结构分析,筛选复制非必需区,构建禽腺病毒载体打下了基础.
关键词： 鹅源腺病毒 基因组DNA 物理图谱 Southern blotting
