The interaction between the human beta-globin locus control region and nuclear matrix.

Abstract:

:Our previous study showed that hydroxyurea (Hu) could induce HEL cells to express human beta-globin gene. However the molecular mechanisms by which the expression of beta-globin gene is activated and regulated are poorly understood. Here we show that the binding patterns between the core DNA sequences (HS2 core sequence -10681 approximately -10971 bp, HS3 core sequence -14991 approximately -14716 bp and HS4 core sequence -18586 approximately -18306 bp) of DNase I hypersensitive sites in the human beta-globin LCR and nuclear matrix proteins isolated from Hu induced and uninduced HEL cells are quite different. Results demonstrated that nuclear matrix proteins might play important roles in regulating the expression of human beta-like globin genes through their interaction with HSs (HS2, HS3 and HS4 core sequences) in the LCR. Moreover, the results obtained from the in vitro DNA-matrix binding assay showed that the core DNA sequences of DNase I hypersensitive sites (HS2, HS3 and HS4) were unable to bind to the nuclear matrix isolated from uninduced HEL cells; in addition, HS2 core DNA sequence was capable of binding to the nuclear matrix prepared from Hu-induced HEL cells, while both HS3 and HS4 core DNA sequences could not do so. Results indicated that the HS2 core DNA sequence may be a functional MAR (matrix attachment region). We suggest that the HS2 core DNA sequence binding to the nuclear matrix in Hu-induced HEL cells may open the structure of chromatin to make the LCR accessible to the promoter of beta-globin gene and to promote its transcription.

journal_name

Cell Res

journal_title

Cell research

authors

Zhang SB,Qian RL

doi

10.1038/sj.cr.7290144

keywords:

subject

Has Abstract

pub_date

2002-12-01 00:00:00

pages

411-6

issue

5-6

eissn

1001-0602

issn

1748-7838

journal_volume

12

pub_type

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