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TCF7L2是一种重要的转录因子,通过Wnt信号途径,调节葡萄糖代谢.胰岛素降解酶(IDE)是细胞水平催化胰岛素降解的最关键的酶,与2型糖尿病(T2DM)高血糖、胰岛素抵抗、高胰岛素血症密切相关.为了检测HePG2细胞内转录因子TCF7L2与IDE基因启动子区的结合情况,采用染色质免疫沉淀技术结合PCR技术检测IDE基因启动子序列.结果表明,在特异性TCF7L2抗体免疫沉淀的DNA片段中扩增出IDE基因启动子序列,因此证实在HePG2细胞内,TCF7L2蛋白可与IDE基因转录启动子的特异区域结合,进而可能参与IDE基因的表达调控. 相似文献
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Genome-wide association studies (GWAS) have repeatedly shown an association between non-coding variants in the TCF7L2 locus and risk for type 2 diabetes (T2D), implicating a role for cis-regulatory variation within this locus in disease etiology. Supporting this hypothesis, we previously localized complex regulatory activity to the TCF7L2 T2D-associated interval using an in vivo bacterial artificial chromosome (BAC) enhancer-trapping reporter strategy. To follow-up on this broad initial survey of the TCF7L2 regulatory landscape, we performed a fine-mapping enhancer scan using in vivo mouse transgenic reporter assays. We functionally interrogated approximately 50% of the sequences within the T2D-associated interval, utilizing sequence conservation within this 92-kb interval to determine the regulatory potential of all evolutionary conserved sequences that exhibited conservation to the non-eutherian mammal opossum. Included in this study was a detailed functional interrogation of sequences spanning both protective and risk alleles of single nucleotide polymorphism (SNP) rs7903146, which has exhibited allele-specific enhancer function in pancreatic beta cells. Using these assays, we identified nine segments regulating various aspects of the TCF7L2 expression profile and that constitute nearly 70% of the sequences tested. These results highlight the regulatory complexity of this interval and support the notion that a TCF7L2 cis-regulatory disruption leads to T2D predisposition. 相似文献
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Cornelia Then Simone Wahl Anna Kirchhofer Harald Grallert Susanne Krug Gabi Kastenmüller Werner R?misch-Margl Melina Claussnitzer Thomas Illig Margit Heier Christa Meisinger Jerzy Adamski Barbara Thorand Cornelia Huth Annette Peters Cornelia Prehn Ina Heukamp Helmut Laumen Andreas Lechner Hans Hauner Jochen Seissler 《PloS one》2013,8(10)
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