Ohneda K, Shimizu R, Nishimura S, Muraosa Y, Takahashi S, Engel JD, Yamamoto M. A minigene containing four discrete cis elements recapitulates GATA-1 gene expression in vivo.
Genes Cells 2002;
7:1243-54. [PMID:
12485164 DOI:
10.1046/j.1365-2443.2002.00595.x]
[Citation(s) in RCA: 43] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/20/2022]
Abstract
BACKGROUND
The GATA-1haematopoietic enhancer (G1HE), located between 3.9 and 2.6 kb 5' to the haematopoietic first exon, is essential for GATA-1 gene transcription in erythroid cells. However, G1HE is not sufficient to confer tissue specificity on the GATA-1 gene in vivo, indicating that additional regulatory sequences are necessary.
RESULTS
We demonstrate here that two other upstream promoter elements containing a double GATA motif or two CACCC boxes are also indispensable for reporter gene expression in erythroid cells in the transgenic mouse. The combination of these three cis-acting regions was sufficient for reporter expression in primitive erythroid cells, as demonstrated by linking the elements together into a 659 bp artificial (GdC) minigene. The minigene activated the transcription of a reporter gene from either the endogenous or an exogenous thymidine kinase promoter, retaining cell type-specificity. The addition of a 320 bp fragment in the first intron to the GdC minigene sustained reporter expression in the definitive stage. Moreover, a line of transgenic mouse that expressed GATA-1 cDNA under the control of the complete 979 bp minigene rescued GATA-1 germ line mutant mice from embryonic lethality.
CONCLUSIONS
A combination of four distinct sequence motifs co-operatively serve as a fundamental functional unit for GATA-1 erythroid transcription in vivo.
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