论文摘要
启动子在决定基因时空表达方面起着十分重要的作用,随着转基因技术的发明,启动子扮演着重要角色,目前植物转基因当中主要使用CaMV 35S,然而在CaMV 35S启动子大量表达外源基因的同时也产生了负面影响。因此人们更想得到能够满足不同需要的启动子,从而使基因的表达方式合乎人们的意愿,在这个需要的带动下关于启动子的前期基础研究更显其必要性。本研究以水稻碳酸酐酶基因启动子为对象,根据水稻碳酸酐酶基因5′端序列,从4处不同位置设计上游引物,在碳酸酐酶基因ATG前0位点处设计下游引物。通过PCR扩增基因5′端1,600 bp,964 bp,585 bp,313 bp片断,将以上目的片段克隆到以GUS为报告基因植物表达载体pBI121上,通过农杆菌介导法转化烟草。Southern检测目的基因已经转入植物体。通过对转化植株GUS活性染色结果表明-1,600bp~0片断启动GUS在烟草的叶、茎中有GUS活性,而其余三段区域(-964bp~0,-585 bp~0,-313 bp~0)未检测出GUS活性,这些暗示了-1,600bp~0启动子区域在控制基因表达具有在叶、茎中表达,在根中不表达的组织特异性。同时对启动子序列分析发现启动子-404 bD~-53bp区域富含GC碱基对,与人和老鼠体内碳酸酐酶Ⅱ型基因肩动子存在高GC区域相似。
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