A highly conserved regulatory element controls hematopoietic expression of GATA-2 in zebrafish

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• 作者：Zhongan Yang (1)
  Hong Jiang (1)
  Fang Zhao (2)
  Deepa B Shankar (3)
  Kathleen M Sakamoto (3)
  Michael Q Zhang (2)
  Shuo Lin (1)
  
• 刊名：BMC Developmental Biology
• 出版年：2007
• 出版时间：December 2007
• 年：2007
• 卷：7
• 期：1
• 全文大小：1469KB
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• 作者单位：Zhongan Yang (1)
  Hong Jiang (1)
  Fang Zhao (2)
  Deepa B Shankar (3)
  Kathleen M Sakamoto (3)
  Michael Q Zhang (2)
  Shuo Lin (1)
  
  1. Department of Molecular, Cell and Developmental Biology, University of California Los Angeles, Los Angeles, California, 90095-1606, USA
  2. Cold Spring Harbor Laboratory, Watson School of Biological Sciences, Cold Spring Harbor, NY, 11724, USA
  3. Division of Hematology-Oncology and Pathology and Laboratory Medicine, Gwynne Hazen Cherry Memorial Laboratories, David Geffen School of Medicine at UCLA, Los Angeles, California, 90095-1752, USA
  

文摘

Background GATA-2 is a transcription factor required for hematopoietic stem cell survival as well as for neuronal development in vertebrates. It has been shown that specific expression of GATA-2 in blood progenitor cells requires distal cis-acting regulatory elements. Identification and characterization of these elements should help elucidating transcription regulatory mechanisms of GATA-2 expression in hematopoietic lineage. Results By pair-wise alignments of the zebrafish genomic sequences flanking GATA-2 to orthologous regions of fugu, mouse, rat and human genomes, we identified three highly conserved non-coding sequences in the genomic region flanking GATA-2, two upstream of GATA-2 and another downstream. Using both transposon and bacterial artificial chromosome mediated germline transgenic zebrafish analyses, one of the sequences was established as necessary and sufficient to direct hematopoietic GFP expression in a manner that recapitulates that of GATA-2. In addition, we demonstrated that this element has enhancer activity in mammalian myeloid leukemia cell lines, thus validating its functional conservation among vertebrate species. Further analysis of potential transcription factor binding sites suggested that integrity of the putative HOXA3 and LMO2 sites is required for regulating GATA-2/GFP hematopoietic expression. Conclusion Regulation of GATA-2 expression in hematopoietic cells is likely conserved among vertebrate animals. The integrated approach described here, drawing on embryological, transgenesis and computational methods, should be generally applicable to analyze tissue-specific gene regulation involving distal DNA cis-acting elements.