Related Experiment Videos
Negative regulatory elements in the human ETS1 gene promoter
1Department of Experimental Pediatric, University of Texas M.D. Anderson Cancer Center, Houston 77030.
Oncogene
|January 1, 1993
Summary
Negative regulatory elements (NREs) in the ETS1 gene promoter were identified, balancing gene expression. These NREs bind transcription factors and regulate ETS1 in hematopoietic cells.
Area of Science:
- Molecular Biology
- Gene Regulation
- Transcription Factor Binding
Background:
- The ETS1 gene promoter has known positive regulators (AP1, AP2, ETS).
- Previous studies suggested the presence of negative regulatory elements (NREs) to prevent ETS1 overexpression.
Purpose of the Study:
- To identify and characterize negative regulatory elements within the human ETS1 gene promoter.
- To investigate the role of these NREs in regulating ETS1 gene expression.
Main Methods:
- Deletion construct analysis of the ETS1 gene promoter.
- Functional analysis of promoter activity.
- Gel mobility-shift assays using nuclear extracts from various cell lines.
Main Results:
- Two NREs were identified and mapped within the ETS1 promoter: NRE1 (230 nt 5' end) and NRE2 (350 nt region).
- These NREs were shown to reduce promoter activity, including that of a heterogenous promoter.
- Gel mobility-shift assays revealed specific binding of NRE1 and NRE2 to nuclear factors in B-lymphoid, T-lymphoid, and erythromyeloid cells, but not in promyelocytic cells.
Conclusions:
- The human ETS1 gene promoter contains functional NREs that bind specific transcription factors.
- These NREs play a crucial role in the precise regulation of ETS1 gene expression in hematopoietic cells.