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The mouse beta-globin locus control region: hypersensitive sites 3 and 4
1Leukaemia Research Fund Centre, Institute of Cancer Research, Chester Beatty Laboratories, London, UK.
Nucleic Acids Research
|November 11, 1992
Summary
Researchers isolated mouse beta-globin LCR regions 5'HS3 and 5'HS4, finding conserved sequences and regulatory elements. These findings highlight the evolutionary complexity of beta-globin LCRs and aid further mouse model studies.
Area of Science:
- Genetics
- Molecular Biology
- Hematopoiesis
Background:
- The human beta-globin locus control region (LCR) is crucial for regulating beta-globin gene transcription.
- The LCR contains four erythroid-specific DNase I hypersensitive sites (5'HS1-4).
Purpose of the Study:
- To isolate and characterize mouse beta-globin LCR elements 5'HS3 and 5'HS4.
- To investigate the evolutionary conservation and functional significance of these elements.
Main Methods:
- Genomic cloning of mouse 5'HS3 and 5'HS4.
- DNA sequence analysis.
- DNase I hypersensitivity assays in erythroid and non-erythroid cells.
- Analysis of mouse strain polymorphisms.
Main Results:
- Isolated genomic clones containing mouse 5'HS3 and 5'HS4, located upstream of the epsilon y-globin gene.
- Demonstrated significant sequence conservation between mouse and human 5'HS3/5'HS4, including transcription factor binding sites.
- Confirmed 5'HS3 and 5'HS4 form hypersensitive sites in erythroid cells but not non-erythroid cells.
- Identified a polymorphism affecting the spacing between 5'HS3 and 5'HS4 in different mouse strains.
Conclusions:
- Mouse beta-globin LCR elements 5'HS3 and 5'HS4 are evolutionarily conserved with humans.
- These elements exhibit erythroid-specific hypersensitivity, indicating regulatory roles.
- The identified polymorphism provides a tool for studying LCR function in mice.
- Results underscore the conserved complexity of mammalian beta-globin LCRs.