Publicado 6 números por año
ISSN Imprimir: 1045-4403
ISSN En Línea: 2162-6502
Indexed in
Regulation of RUNX1 Transcriptional Function by GATA-1
SINOPSIS
Runt-related transcription factor 1 (RUNX1) and GATA-1 are both transcription factors known to play essential roles in hematopoiesis. Genetic alterations of each are associated with abnormal platelet development, as well as predisposition to leukemia. In addition, in vitro and animal studies indicate that both factors are involved in megakaryopoiesis. We and others have previously shown that RUNX1 and GATA-1 physically interact and cooperate in the activation of megakaryocytic promoters such as αIIb integrin and glycoprotein Ibα. Moreover, transcriptional cooperation of RUNX1 with GATA-1 is conserved back to Drosophila in which RUNX1 and GATA-1 homologs cooperate in crystal cell development. In this article, we will review the molecular and functional significance of the transcriptional cross talk between RUNX1 and GATA-1. In particular, we will elaborate on recent data which suggest that GATA-1 targets RUNX1 for modification, in particular phosphory-lation by cyclin-dependent kinases. Furthermore, targeting of RUNX1 by GATA-1 for phosphorylation may convert RUNX1 from a repressor to an activator. This is a potential mechanism of transcriptional cooperation and may be an essential step in megakaryocytic differentiation.
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