Section 9
Chapter 8,151

An upstream region of the H2AZ gene promoter modulates promoter activity in different cell types

Hatch, C.L.; Bonner, W.M.

Biochimica Et Biophysica Acta 1305(1-2): 59-62


ISSN/ISBN: 0006-3002
PMID: 8605251
DOI: 10.1016/0167-4781(95)00223-5
Accession: 008150660

Human H2AZ gene promoter fragments that included sequences upstream from the core promoter resulted in decreased activity of reporter constructs transfected into several human cell lines, but increased activity in the undifferentiated human embryonal carcinoma cell line Tera-2. Differentiation of Tera-2 cells in media containing retinoic acid restored the ability of the upstream region to downregulate H2AZ gene promoter activity. Levels of endogenous H2AZ mRNA were also found to be 2.5-fold higher in undifferentiated Tera-2 cells than in differentiated Tera-2 cells. A 128 bp region located 234 to 361 bp upstream from the transcription start site of the H2AZ gene was found to be responsible for the modulation of reporter activity. The upstream region also functioned similarly when removed from the H2AZ gene promoter and inserted upstream of the SV40 promoter in reporter constructs. Gel mobility shift studies of fragments of this region revealed two sequence elements, CTCCTCC and CACGTG, that bound nuclear factors in vitro.

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