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Developmental regulation of the human beta-globin cluster
S M Jane1, P Amrolia, J M Cunningham
1Rotary Bone Marrow Research Laboratory, Royal Melbourne Hospital, Parkville, Vic.
Australian and New Zealand Journal of Medicine
|December 1, 1995
Summary
Scientists identified stage selector elements (SSE) that control fetal globin gene expression by binding specific proteins. This mechanism, involving CP2 and a partner protein, is conserved across species, revealing evolutionary insights into gene regulation.
Area of Science:
- Molecular Biology
- Genetics
- Developmental Biology
Background:
- Human beta-globin gene cluster expression is tightly regulated during development.
- Competition between gamma- and beta-promoters for Locus Control Region (LCR) sequences is key to this regulation.
Purpose of the Study:
- To identify and characterize elements mediating preferential gamma-gene interaction with the LCR during fetal development.
- To elucidate the protein factors involved in this stage-specific gene regulation.
Main Methods:
- Definition and localization of stage selector elements (SSE and SSE-2) in the gamma-promoter and 5'UTR.
- Purification and characterization of the protein complex binding the proximal SSE.
- Comparative analysis of human and chicken stage selector proteins.
Main Results:
- Identified two stage selector elements (SSE and SSE-2) crucial for fetal gamma-gene interaction with the LCR.
- Characterized the proximal SSE binding protein as a complex of transcription factor CP2 and a 40 kDa partner.
- Demonstrated homology between human CP2 complex and chicken NF-E4, indicating conserved mechanisms.
Conclusions:
- Developmentally-specific protein complexes mediate competitive silencing of globin genes.
- The identified mechanism involving SSEs and protein complexes is evolutionarily conserved.
- Findings provide insights into the molecular basis of developmental gene regulation in the beta-globin cluster.