eIF4E和 VEGF C在大肠癌中的表达及其意义

目的探讨大肠癌组织中真核细胞翻译起始因子4E(eIF4E)和血管内皮生长因子 C(VEGF C)的表达及意义.方法应用免疫组织化学技术检测46例大肠癌及20例正常大肠组织中 eIF4E和 VEGF C的表达,同时结合患者的临床病理资料进行分析.结果46例大肠癌组织中的 elF4E和 VEGF C的表达阳性率分别为91.3和76.1%.而正常大肠组织中 elF4E和 VEGF C的表达阳性率分别为10%和20%.eIF4E和 VEGF的表达都与大肠癌患者性别、年龄、肿瘤病理分化程度无明显相关,但与肿瘤浸润深度、临床分期、有无淋巴结转移有关(P<0.05);两者的表达具有正相关(r=0.347,P<0.05).结论 eIF4E和 VEGF C与大肠癌的发生发展密切相关,可作为判断大肠癌侵袭转移及预后的重要指标     

高等真核低频磁场作用后特异反应基因的克隆及鉴定

极低频磁场（ＥＬＦＭＦ）生物学效应的机理研究是当前生物电磁学中迫切需要解决的问题,为探索ＥＬＦＭＦ的特异反应基因及这些基因的结构与功能,用ｍＲＮＡ差异显示技术对受ＥＬＦＭＦ辐照与假辐照的Ｄａｕｄｉ细胞内的ｍＲＮＡ进行了检测,筛选到一个受ＥＬＦＭＦ诱牵ＤＤ片段,反向Ｎｏｒｔｈｅｒｎ及Ｎｏｒｔｈｅｒｎ鉴定进一步证实系磁场导所致,经克隆测序及与ＧｅｎｅＢａｎｋ同源性比较表明该基因片段（ＭＦ－ＣＡ）是人细     

淋巴囊肿病病毒主要衣壳蛋白基因片段在真核细胞中的初步表达

将淋巴囊肿病病毒（Lymphocystis disease virus,LCDV）主要衣壳蛋白（Majoy capsid protein,MCP）0.6kb基因片段克隆入真核表达载体pEGFP-N2,得到阳性重组质粒pEGFP-N2-LCDV0.6,用脂质体法将其转染入真核细胞CHO,并进行瞬时表达,荧光显微镜观察及特异性RT-PCR检测结果表明：已成功将目的片断LCDV MCP 0.6kb转染到CHO细胞,并得到了初步表达。此研究为LCDV基因工程疫苗的研制提供了实验资料。     

Detecting chimeric 5′／3′UTRs with cross-chromosomal splicing by bioinformatics

The 5′/3′ UTRs of mRNA are crucial in translational regulation, and several serious diseases are believed tobe associated with abnormal splicing of these parts of the mRNA sequence. In this work a novel method which usessequence alignment database searching for detecting chimeric 5′/3′ UTRs with cross-chromosomal splicing is reported.Eight highly credible instances of cross-chromosomal splicing have been found using this method, representing additional confirmation of the existence of cross-chromosomal splicing events provided by bioinformatics tools. Since noconserved motif has been found in any of the eight instances,and at the same time current prediction algorithms produceonly trivial secondary structures at the “splicing sites“, it isnot possible to identify any specific signal leading to the splicing.     

Regulation of microRNA on plant development and viral infection

THE FIRST MIRNA WAS IDENTIFIED IN C. ELEGANS AS EARLY AS IN 1993; THE IMPORTANCE OF MIRNAS, HOWEVER, IS RECOGNIZED ONLY RECENTLY AFTER THE DISCOVERY OF MIRNAS EXISTING UNIVERSALLY IN EUKARYOTIC ORGANISMS. THE SECOND MIRNA WAS IDENTIFIED IN 2000[1]. SINCE …