作物学报 ›› 2020, Vol. 46 ›› Issue (11): 1703-1710.doi: 10.3724/SP.J.1006.2020.02002
马硕1(), 焦悦2(), 杨江涛1, 王旭静1,*(), 王志兴1,*()
MA Shuo1(), JIAO Yue2(), YANG Jiang-Tao1, WANG Xu-Jing1,*(), WANG Zhi-Xing1,*()
摘要:
外源DNA片段的拷贝数及插入位点的侧翼序列等分子特征信息是转基因植物安全评价过程中必需要提供的信息。本研究利用基因组测序结合生物信息学对耐除草剂转基因水稻G2-7的T-DNA插入位点、拷贝数和侧翼序列进行鉴定。利用Illumina NovaSeq 6000平台对G2-7进行全基因组测序, 共获得47.13 Gb的测序数据, 通过与转基因载体和参考基因组序列的比较, 确定了G2-7中T-DNA在受体基因组中的插入位点。结果显示, 外源DNA片段以单位点单拷贝形式插入到水稻1号染色体的36,189,491~36,189,507位置, 造成水稻基因组16 bp DNA缺失, 无载体骨架的插入。同时我们获得外源基因插入位点5′侧翼序列375 bp和3′端侧翼序列353 bp, 并通过PCR扩增和Sanger测序进一步证明获得的侧翼序列是正确的。研究结果为转基因水稻G2-7的安全评价及转化体特异性检测提供了有效的数据支撑, 同时也证明全基因组测序(WGS)是解析转基因植物分子特征的有效方法。
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