ABSTRACT
Abstract Objective:To better understand the regulatory mechanism of Pax-5 gene expression on B-cell differentation and development.Methods:The isolation and genomic colning of the 5'-flanking region of Pax-5 gene were carried out according to established protocols: molecu-lar cloning and subcloning The nucleotide sequences were determined by a double-stranded dideoxy sequencing method. Sequence analysis wasperformed on line programs. Results:Analysis of tha total sequence(6 671 bp) shows the proximal promoter include 3 CAT boxes, 1SP1 and 1Ebox. However, there was no consensus sequence for a TATA box in the 5'-flanking region. Putative regulatory sites of further upstream in thesequence revealed 6LMO2 COM, 5NFAT, 2LPOLYA-B, 3GATA1, 2AP4, 10MZF1, 1ets1B, 1GATA3, 1NKX-25, 2RORA1, 1LYF1, 2Ikaros2,2TCF11 , 1GATA-C and 1FREAC7. Conclusion: The 5'-flanking regionn of human Pax-5 gene exon1B could be involved in regulating the expres-sion of human Pax5 and B-cell differentiation and development.