转基因玉米MON88017旁侧序列分析及定性PCR检测

采用基因组步移法和巢式PCR方法研究转基因玉米MON88017外源基因插入位点旁侧序列特征,获得了外源基因插入位点的左边界旁侧序列504bp,包括336bp的插入载体序列和168bp的玉米基因组序列。根据此旁侧序列,设计MON88017转化事件特异性引物并进行定性PCR扩增,扩增片段为446bp,建立了转基因玉米MON88017转化体特异性检测方法。该方法特异性强、灵敏度高(0.1%),为转基因玉米品种MON88017进出口检测和标识检测提供了技术基础。

Analysis of Junction Sequence in the Transgenic Maize MON88017 and the Methods of Qualitative PCR Detection

The experiment was conducted to investigate the integration site of transgene in maize MON88017 and to establish event specific methods for qualitative detection of MON88017 based on the left border junction fragment, which was isolated with the amended GenomeWalker and Nested-PCR methods. Sequence alignment between the T-DNA sequence and isolated junction fragments showed a 504 bp junction fragment of MON88017 including 336 bp of T-DNA sequence and 168 bp of MON88017 genome DNA. MON88017 event-specific qualitative PCR method was established with the primers (MON88017-1F/R) targeting the junction regions to produce a 446 bp product. The limit of detection for qualitative PCR assay was 0.1%. The method developed in this work is highly specific, sensitive and suitable for MON88017 sample detection.