期刊
DEVELOPMENTAL BIOLOGY
卷 298, 期 2, 页码 616-631出版社
ACADEMIC PRESS INC ELSEVIER SCIENCE
DOI: 10.1016/j.ydbio.2006.07.020
关键词
pancreas; beta cell; foregut development; enteroendocrine; Pdx1 I; Ipf1; transcription factor; cis-regulation
资金
- NIDDK NIH HHS [DK20593, DK68854, DK63439, DK042502, DK69603, DK59637] Funding Source: Medline
The unique, well-demarcated expression domain of Pdx1 within the posterior foregut suggests that investigating its transcriptional regulation will provide insight into mechanisms that regionally pattern the endoderm. Previous phylogenetic comparison identified conserved noncoding regions that stimulate transcriptional activity selectively in cultured pancreatic cells. Characterization of these regulatory elements is helping to dissect the transcription factor networks that operate within cells, which is important for understanding the etiology of cell dysfunction and diabetes, as well as for developing methods to produce cells in vitro for cell-based therapies. We recently reported that deletion of three proximally located conserved areas (Area I-II-III) from the endogenous Pdx1 locus resulted in severely reduced expression of Pdx1 in the pancreas, and a milder decrease in other foregut tissues. Here, we report transgene-based complementation experiments on Pdx1 null mice, which reveal that the proximal promoter/enhancer region, including Area I-II-III, rescues the pancreatic defects caused by Pdx1 deficiency, but only weakly promotes expression of Pdx1 in the postnatal stomach and duodenum. These results reveal a role for distal cis-regulatory elements in achieving the correct level of extra-pancreatic Pdx1 expression, which is necessary for the production of duodenal GIP cells and stomach gastrin cells. (c) 2006 Elsevier Inc. All rights reserved.
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