ID4基因启动子克隆及表达调控载体的构建

Cloning of ID4 gene promoter and construction of its expression regulatory vector

  • 摘要: 目的 深入研究ID4基因的表达调控机制。方法 在NCBI人类基因组数据库中截取并下载ID4基因转录起始位点上游5′侧翼区约2242bp及下游5′非翻译区212bp的基因组序列,设计PCR扩增引物,采用分段扩增法,从健康人外周血中扩增获得2条长度分别为1829bp和784bp的产物片段,插入用于表达调控研究的pGL3Basic荧光素酶报告载体,实现连接,经测序鉴定。以此为基础进行亚克隆,分别获得5条5′端不等、3′端平齐的片段,插入pGL3Basic载体。结果 获得了6条长度依次差别约为400bp的ID4启动子克隆,分别构建了调控荧光素酶报告基因的真核表达载体。结论 成功克隆了人ID4基因启动子并构建了表达调控载体,为研究ID4启动子活性及表达调控奠定了基础。

     

    Abstract: Objective To study the expression regulatory mechanism of ID4 gene. Methods The upstream 5’ lateral wing region of 2 242bp from transcriptional start site(TSS) and downstream 5’ non-coding region of 212bp on ID4 gene were searched out and downloaded from human genome databank of NCBI using the ID4 gene whole length cDNA as a probe.According to the targeted sequence,PCR amplification primers were designed and synthesized.Segmental amplification method was used to obtain two fragments of 1 829bp and 784bp in peripheral blood DNA samples from a healthy donor.The two fragments were inserted into pGL3 basic vector and ligation was successfully completed.After identification by sequencing,the ID4 promoter-pGL3bbasic recombinant was used as a template to subclone 5 fragments with identical 3’ terminus and different 5’ terminus.Then,the ID4 promoter subclone fragments were inserted into the pGL3 basic vector. Results The 6 identified ID4 promoter sequences with an interval of approximate 400bp were successfully cloned and 6 sub-ID4 promoter-pGL3 basic recombinants were constructed. Conclusion The human ID4 promoter we cloned and its expression regulatory vector we constructed lay a foundation for study on the promoter activity and expression regulation of ID4 gene.

     

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