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Identification of 5' flanking sequence of RH50 gene and the core region for erythroid-specific expression.

Abstract：

:The Rh blood group antigens are carried by two distinct but homologous membrane proteins encoded by two closely related genes, RCHE and RHD. Rh50 glyco-protein is the membrane protein tightly associated with Rh polypeptides and is critical for expression of Rh antigens. The amino acid sequence and predicted membrane topology of Rh50 glycoprotein are significantly homologous with those of the Rh proteins. Northern blot analysis of leukemic cell lines showed that expression of RH50 gene is restricted to cells with erythroid features. HEL and K562 cells showed a transcription levels ratio of 1 to 9.9 for Rh50, and 12.3 to 1 for Rh. The nucleotide sequence of 5' flanking region of RH50 gene and functional promoter assays also supported the erythroid-specific regulation of the gene, whereas the sequence had lower homology with the promoter sequence of RH genes. Seven GATAs, nine E-boxes, two CACCCs, one YY1, and one October motif were identified in the 1868bp 5' flanking sequence. The core promoter of RH50 gene was located within 68bp length from the translation start position, which included an inverse GATA motif, although obvious motifs for Sp1 or erythroid Krüppel-like factor were lacking. The inverse GATA motif was the target sequence of GATA-1 protein, and disruption of the motif abolished the transactivating activity of erythroid cells. These studies confirm the erythroid-specific expression of Rh antigens, but suggest distinct regulatory mechanisms for RH vs RH50 genes.

journal_name

Biochem Biophys Res Commun

journal_title

Biochemical and biophysical research communications

authors

Iwamoto S,Omi T,Yamasaki M,Okuda H,Kawano M,Kajii E

doi

10.1006/bbrc.1997.8023

subject

Has Abstract

pub_date

1998-02-04 00:00:00

pages

233-40

issue

1

eissn

0006-291X

issn

1090-2104

pii

S0006-291X(97)98023-2

journal_volume

243

pub_type

杂志文章

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