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High-mobility group protein 2 may be involved in the locus control region regulation of the beta-globin gene cluster.

Expression regulation of the beta-globin gene cluster is a result of synergistic interactions between cis-elements and trans-acting factors. Previous studies usually concentrated on the core sequence of each hypersensitive site in the locus control region of the beta-globin gene cluster. But more and more evidence illustrates that the flanking regions are indispensable also. Using electrophoretic mobility shift assay and solid-phase DNase I footprinting methods, we identified a small nuclear protein from K562 cells that binds specifically to the first AT-rich region flanking the hypersensitive site 2 core sequence of the human beta-globin gene locus control region. N-terminal sequencing of the enriched protein proved that it is a member of the high-mobility group protein 2 family. This indicates that the AT-rich region in human hypersensitive site 2 may take part in the regulation of the beta-globin gene cluster by facilitating DNA bending, which is a prerequisite for the looping mechanism in this region.[1]

References

  1. High-mobility group protein 2 may be involved in the locus control region regulation of the beta-globin gene cluster. Lv, X., Xu, D.D., Liu, D.P., Li, L., Hao, D.L., Liang, C.C. Biochem. Cell Biol. (2002) [Pubmed]
 
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