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两个不同来源的番茄GGPS基因克隆和序列分析

DOI: 10.7668/hbnxb.2009.03.004, PP. 15-22

Keywords: 番茄,GGPS,上游侧翼序列,基因克隆,序列分析

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Abstract:

据本实验室得到的GGPS基因片段与NCBI公布的GGPS基因cDNA(DQ267903)序列设计引物,以两份番茄红素含量差异显著的番茄材料:普通番茄(编号E6203)和源于多毛番茄的渐渗系(编号TASl7)为试材,分别克隆其DNA和cDNA序列.序列分析显示:GGPS基因不含有内含子.所推导氨基酸序列比对表明:2个不同来源的GGPS基因存在13个差异位点,其中9个位点的氨基酸性质发生了变化.氨基酸变异导致了2个GGPS基因的二级结构与磷酸化位点的不同,初步推测番茄红素含量的差异可能与氨基酸变异有关;采用双链接头介导的染色体步移技术,克隆了GGPS基因5'侧翼序列,进一步分析结果显示:两份材料GGPS上游区序列差异明显,但所包含的顺式元件的分布相对保守,且存在明显的转录调控序列;利用RT-PER方法对不同器官的GGPS基因表达进行初步研究,结果表明:GGPS基因主要在果实和花器官中表达.

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