转基因植物中外源非目的基因片段的生物安全研究进展

The biosafety of genetically engineered plants has been of concernment in society and science in recent years. The issue of 35S promoter of CaMV has been contentious because of its wide use in plant genetic engineering. The debate on the safety and potential risks of the 35S promoter will be discussed here. Some of concerns are expressed about the dissemination of antibiotic_resistance genes and vector backbone sequences. Various methods and strategies are currently being developed for the marker gene excision and elimination of vector backbone sequences from transgenic plants. In this review, the CRE/ lox system which could get rid of the marker geens and vector backbone sequences will be discussed in detail. Advances in the research of the safety assessment of genetically modified plants using the CRE/ lox system will also be described.

无载体框架序列转基因小麦中外源基因表达框的遗传分析

通过基因枪介导转化无载体框架序列的基因最小框架是一种新的基因转化技术。在应用此新转化系统获得转1Ax1小麦植株的基础上,着重研究了转基因植株中外源1Ax1基因表达框的遗传。结果表明:无载体框架结构的1Ax1基因在T1代中呈现3∶1的分离,符合单基因位点孟德尔遗传模式。首次在小麦中揭示了无载体框架序列基因遗传转化技术的可行性,并且证实了外源基因最小表达框在转基因后代中的稳定遗传。

转基因植物中载体骨架序列的安全性隐患及解决方案

载体骨架序列等非目的基因外源DNA片段整合入植物染色体中有可能引发的安全性问题已成为近年来植物基因工程研究的热点之一。总结了载体骨架序列整合进植物染色体的现象、由此引发的安全性隐患和机理 ,以及解决该问题的研究思路和方法 。