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- W2135477856 abstract "In this dissertation, we explore the transcriptional regulatory roles of Gquadruplex-forming motifs and the involvement of specific transcriptional factors, which interact with the same elements, in the control of human c-myc and bcl-2 gene expression. The G-quadruplex structures within the NHE III1 region of the c-myc promoter and their ability to repress transcription has been well established. However, a longstanding unanswered question is how these stable DNA secondary structures are transformed to activate c-myc transcription. NDPK-B has been recognized as an activator of c-myc transcription via interactions with NHE III1 region of the c-myc gene promoter. Through the use of RNAi, we confirmed the transcriptional regulatory role of NDPK-B. We demonstrate that NDPK-B has DNA binding activity and the nuclease activity results from a contaminating protein. NDPK-B preferentially binds to the singlestranded guanine-rich strand of the c-myc NHE III1. Potassium ions and G-quadruplexinteractive agents, which stabilize G-quadruplex structures, had an inhibitory effect on NDPK-B DNA binding activity. Based on our studies, we have proposed a stepwise trapping-out of the NHE III1 region in a single-stranded form, thus allowing singlestranded transcription factors to bind and activate c-myc transcription. This model provides a rationale for how the stabilization of G-quadruplexes within the c-myc gene promoter region can inhibit NDPK-B from activating c-myc transcription. Similarly, the human bcl-2 gene contains a GC-rich region within its promoter region, which is critical in the regulation of bcl-2 expression. We demonstrate that the guanine-" @default.
- W2135477856 created "2016-06-24" @default.
- W2135477856 creator A5057930914 @default.
- W2135477856 date "2006-01-01" @default.
- W2135477856 modified "2023-09-28" @default.
- W2135477856 title "Defining the Role of DNA Secondary Structures and Transcriptional Factors in the Control of c-myc and bcl-2 Expression" @default.
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