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Published on: February 21, 2015
Cloning and characterization of the NPCEDRG gene promoter
Defu Hou1, Yongjun Guan, Jianping Liu
1Key Laboratory of Cancer Proteomics of Chinese Ministry of Health, Xiangya Hospital, Central South University, 87# Xiangya Road, Changsha, 410008, Hunan, China.
Abstract:
NPCEDRG is a novel tumor suppressive gene that localizes to 3p21.3, a chromosomal region frequently associated with loss of heterozygosity (LOH) in a number of malignancies including nasopharyngeal carcinoma (NPC). Its transcriptional down-expression has been shown in the cell lines and primary tumor tissues of NPC. Reintroduction of NPCEDRG into CNE2, a cell line derived from NPC, was effective to induce cell differentiation, control cell growth, and regulate the cell cycle. Little is known about the transcriptional mechanisms controlling NPCEDRG gene expression. In this article, we describe the NPCEDRG gene structure and the transcriptional expression of NPCEDRG; we found that NPCEDRG was expressed weakly in most of NPC cell lines. Using 5' rapid amplification of complementary DNA ends (5'-RACEs), we found that the NPCEDRG gene has several transcription start sites (TSSs) due to the existence of alternatively spliced variants, and the specific TSS of NPCEDRG was located -25 nucleotides upstream of the translation start site. We amend that Human NPCEDRG CDS containing 516 bp but not the 510 bp reported previously. To characterize the NPCEDRG promoter, transient luciferase and/or EGFP reporter assay were carried out with the constructs including various lengths of the 5' flanking region of the NPCEDRG gene. The results demonstrated that the basal promoter is located at the region from -215 to -8 nucleotides, and the optimal promoter is located at the region from -625 to -8 nucleotides upstream of the translation start site. In silico analysis suggested that the promoter region contained potential binding sites for SP1, c-Myb, AREB6, Nkx2-5, and so on. These results provide important clues to elucidate the regulation of NPCEDRG gene expression and function. Further studies are apparently required for the identification of the transcription factors, essential for NPCEDRG expression, which would lead to better understanding of the molecular mechanism of NPCEDRG expression in nasopharyngeal epithelial cells.
Insights
NPCEDRG is a tumor suppressor gene involved in nasopharyngeal carcinoma (NPC). Researchers identified its promoter region and transcription start sites, offering insights into its gene expression regulation.
Area of Science:
- Molecular Biology
- Genetics
- Cancer Research
Background:
- NPCEDRG is a novel tumor suppressor gene located on chromosome 3p21.3.
- Down-expression of NPCEDRG is observed in nasopharyngeal carcinoma (NPC) cell lines and tissues.
- NPCEDRG reintroduction into NPC cell lines induces differentiation, controls growth, and regulates the cell cycle.
Purpose of the Study:
- To elucidate the transcriptional mechanisms controlling NPCEDRG gene expression.
- To characterize the NPCEDRG gene structure, transcription start sites (TSSs), and promoter region.
- To identify potential regulatory elements and transcription factors involved in NPCEDRG expression.
Main Methods:
- 5' rapid amplification of complementary DNA ends (5'-RACEs) to identify TSSs.
- Transient luciferase and/or EGFP reporter assays to characterize the promoter region.
- In silico analysis to predict transcription factor binding sites.
Main Results:
- NPCEDRG exhibits weak expression in most NPC cell lines.
- Multiple TSSs were identified due to alternative splicing, with a specific TSS at -25 nucleotides.
- The basal promoter spans -215 to -8 nucleotides, and the optimal promoter is from -625 to -8 nucleotides.
- Potential binding sites for transcription factors like SP1, c-Myb, AREB6, and Nkx2-5 were predicted.
Conclusions:
- The study provides crucial information on the structure and transcriptional regulation of the NPCEDRG gene.
- Understanding NPCEDRG's promoter and TSSs offers insights into its role in NPC development.
- Further research is needed to identify specific transcription factors regulating NPCEDRG expression for a comprehensive understanding of its molecular mechanisms.
