Identification of genomic insertion and flanking sequences of the transgenic drought-tolerant maize line "SbSNAC1-382" using the single-molecule real-time (SMRT) sequencing method

文献类型： 外文期刊

第一作者： Zeng, Tingru

作者： Zeng, Tingru;Zhang, Dengfeng;Li, Yongxiang;Li, Chunhui;Liu, Xuyang;Shi, Yunsu;Song, Yanchun;Li, Yu;Wang, Tianyu

作者机构：

期刊名称：PLOS ONE （ 影响因子：3.24； 五年影响因子：3.788 ）

ISSN： 1932-6203

年卷期： 2020 年 15 卷 4 期

页码：

收录情况： SCI

摘要： Safety assessment of genetically modified (GM) crops is crucial at the product-development phase before GM crops are placed on the market. Determining characteristics of sequences flanking exogenous insertion sequences is essential for the safety assessment and marketing of transgenic crops. In this study, we used genome walking and whole-genome sequencing (WGS) to identify the flanking sequence characteristics of the SbSNAC1 transgenic drought-tolerant maize line "SbSNAC1-382", but both of the two methods failed. Then, we constructed a genomic fosmid library of the transgenic maize line, which contained 4.18x10(5) clones with an average insertion fragment of 35 kb, covering 5.85 times the maize genome. Subsequently, three positive clones were screened by pairs of specific primers, and one of the three positive clones was sequenced by using single-molecule real-time (SMRT) sequencing technology. More than 1.95 Gb sequence data (similar to 10(5) x coverage) for the sequenced clone were generated. The junction reads mapped to the boundaries of TDNA, and the flanking sequences in the transgenic line were identified by comparing all sequencing reads with the maize reference genome and the sequence of the transgenic vector. Furthermore, the putative insertion loci and flanking sequences were confirmed by PCR amplification and Sanger sequencing. The results indicated that two copies of the exogenous T-DNA fragments were inserted at the same genomic site, and the exogenous T-DNA fragments were integrated at the position of Chromosome 5 from 177155650 to 177155696 in the transgenic line 382. In this study, we demonstrated the successful application of the SMRT technology for the characterization of genomic insertion and flanking sequences.

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