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Updated: Aug 11, 2026
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Real-time Analysis of Transcription Factor Binding, Transcription, Translation, and Turnover to Display Global Events During Cellular Activation
Published on: March 7, 2018
Functional analysis of the human RAG 2 promoter
1Institute of Medical Science, 610 University Avenue, Ontario Cancer Institute, Room 8-111, Ont., M5G 2M9, Toronto, Canada. ifong@oci.utoronto.ca
Molecular Immunology
|November 14, 2000
Summary
The human RAG2 exon 1A promoter has two regulatory domains critical for transcription. One domain ensures general promoter activity, while another provides lineage-specific regulation in B and T cells.
Area of Science:
- Immunology
- Molecular Biology
- Genetics
Background:
- Recombination activating genes (RAG1 and RAG2) are crucial for V(D)J recombination, essential for generating lymphocyte antigen receptors.
- Understanding the transcriptional regulation of RAG2 is key to deciphering lymphocyte development and immune system function.
Purpose of the Study:
- To characterize the human RAG2 exon 1A promoter and identify its regulatory elements.
- To elucidate the mechanisms controlling RAG2 gene transcription in a lineage- and developmental-specific manner.
Main Methods:
- Deletion constructs and linker scanning were employed to isolate and analyze promoter regions.
- Electrophoretic Mobility Shift Assays (EMSA) were used to assess DNA/protein interactions.
- Transfection experiments were conducted to evaluate the role of specific transcription factors.
Main Results:
- Two critical regulatory domains were identified within the RAG2 exon 1A promoter: a ubiquitous domain (-140 to -123) and a lineage-specific domain (-69 to -48).
- Mutations in Ets and C/EBP sites within the ubiquitous domain affected promoter activity, while mutations in the BSAP-myb-Ikaros-myb site within the lineage-specific domain altered activity differentially in B and T cells.
- A B cell-specific protein complex was detected, and BSAP was found to trans-activate the RAG2 promoter.
Conclusions:
- Transcriptional regulation of the human RAG2 gene is complex, involving both ubiquitous and tissue-specific factors.
- Both proximal and distal regulatory elements contribute to the precise control of RAG2 expression in lymphocytes.
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