大鼠XAF1基因启动子荧光素酶报告质粒的构建及IRF-1结合位点的鉴定

被引:0
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作者
周建博
邱文
卢燕来
单锴
赵聃
王迎伟
机构
[1] 南京医科大学微生物与免疫学系
关键词
X染色体连锁的凋亡抑制蛋白相关因子1(XAF1); 干扰素调节因子-1(IRF-1); 启动子; 生物信息学; 荧光素酶报告质粒;
D O I
暂无
中图分类号
R111 [卫生生物学];
学科分类号
摘要
目的:构建大鼠X染色体连锁的凋亡抑制蛋白相关因子1(X-linked inhibitor of apoptosis associated factor 1,XAF1)基因启动子(全长和截断)荧光素酶报告质粒,并观察在人胚肾细胞HEK293中过表达干扰素调节因子-1(interferon regulatoryfactor-1,IRF-1)对XAF1基因启动活性的影响,同时,筛选其可能的IRF-1结合位点。方法:采用PCR技术,扩增出大鼠XAF1基因启动子序列(-1497~+166 nt),将XAF1基因启动子插入荧光素酶报告基因载体pGL3-basic中获得pGL3-XAF1-QC,与大鼠野生型IRF-1表达质粒(pcDNA3.1-IRF-1)共转染HEK293细胞,检测其荧光素酶活性,确定IRF-1对XAF1基因的启动作用。同时,应用生物信息学软件预测XAF1基因启动子上IRF-1潜在的结合位点,并构建截断的XAF1基因启动子荧光素酶报告质粒(pGL3-XAF1-1、pGL3-XAF1-2、pGL3-XAF1-3和pGL3-XAF1-4)。将上述全长和各截断的XAF1基因启动子荧光素酶报告质粒和IRF-1过表达质粒共转染HEK293细胞,再行荧光素酶活性测定,筛选IRF-1的结合位点。结果:菌液PCR及核酸测序证实,上述荧光素酶报告质粒均构建成功。将pGL3-XAF1-QC和pcDNA3.1-IRF-1共转染HEK293细胞发现,XAF1基因启动子活性显著增加。而将pGL3-XAF1-QC、pGL3-XAF1(1~4号)和pcDNA3.1-IRF-1共转染HEK293细胞后证实,pGL3-XAF1-3的启动活性显著低于pGL3-XAF1-1和pGL3-XAF1-2。提示IRF-1可能结合在大鼠XAF1基因启动子的-337~-47 nt区域。结论:本实验成功构建了大鼠全长及截断的XAF1基因启动子荧光素酶报告质粒,并初步筛查出IRF-1在XAF1基因启动子上的结合区域,为后续研究奠定了基础。
引用
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页码:295 / 300
页数:6
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