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The interaction between the human beta-globin locus control region and nuclear matrix.
1State Key Laboratory of Molecular Biology, Shanghai Institutes for Biological Sciences, Chinese Academy of Sciences, 320 Yueyang Road, Shanghai 200031, China.
Cell Research
|January 17, 2003
Summary
Hydroxyurea (Hu) treatment alters nuclear matrix protein binding to human beta-globin gene regulatory regions. The HS2 DNA sequence acts as a matrix attachment region, potentially activating gene expression by improving chromatin accessibility.
Area of Science:
- Molecular Biology
- Genetics
- Cell Biology
Background:
- Hydroxyurea (Hu) induces human beta-globin gene expression in HEL cells, but the underlying molecular mechanisms remain unclear.
- The human beta-globin locus control region (LCR) is crucial for regulating globin gene expression.
Purpose of the Study:
- To investigate the role of nuclear matrix proteins in regulating human beta-globin gene expression.
- To identify specific DNA sequences within the LCR that interact with nuclear matrix proteins.
Main Methods:
- Isolation of nuclear matrix proteins from hydroxyurea-induced and uninduced HEL cells.
- DNA-matrix binding assays using core DNA sequences of DNase I hypersensitive sites (HS2, HS3, HS4) within the beta-globin LCR.
Main Results:
- Distinct differences in DNA-matrix binding patterns were observed between Hu-induced and uninduced HEL cells.
- The HS2 core DNA sequence specifically bound to the nuclear matrix in Hu-induced HEL cells, unlike HS3 and HS4.
- HS2 core DNA sequence is identified as a potential functional matrix attachment region (MAR).
Conclusions:
- Nuclear matrix proteins play a significant role in regulating human beta-like globin gene expression via LCR interactions.
- The HS2 MAR may facilitate chromatin opening, enhancing LCR accessibility and promoting beta-globin gene transcription upon Hu induction.