The Krüppel-like zinc finger protein GLIS3 transactivates neurogenin 3 for proper fetal pancreatic islet differentiation in mice.

The Krüppel-like zinc finger protein GLIS3 transactivates neurogenin 3 for proper fetal pancreatic islet differentiation in mice.
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DOI:
10.1007/s00125-011-2255-9
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发表时间:
2011-10
期刊:
影响因子:
8.2
通讯作者:
Chan, L.
Chan, L.
中科院分区:
医学1区
文献类型:
--
作者:
Yang, Y.;Chang, B. H-J.;Yechoor, V.;Chen, W.;Li, L.;Tsai, M. -J.;Chan, L.

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编码Krüppel样锌指转录因子的GLIS 3突变被发现是散发性新生儿糖尿病的基础。先前在小鼠中通过基因靶向失活Glis 3被证明会导致新生儿糖尿病,但其潜在机制在很大程度上仍不清楚。我们的目的是阐明GLIS家族锌指3(GLIS 3)在Glis 3 −/−小鼠中的作用机制,并进一步解释其在体外系统中的作用。我们创造了Glis 3 −/−小鼠,并在胚胎发育的不同阶段监测其胰岛的形态和生化表型。我们将这些观察结果与在培养细胞中表达的Glis 3的实验相结合,以及在其他重组成分存在下的体外系统中。体内和体外分析将Glis 3置于Neurog 3的上游,Neurog 3是内分泌胰腺谱系定义转录因子。我们发现GLIS 3与Neurog 3启动子中的特异性GLIS 3反应元件结合,直接激活Neurog 3基因转录,并与肝核因子6和叉头框A2协同激活。这些结果表明,GLIS 3通过Neurog 3的直接反式激活来控制胎儿胰岛分化,Neurog 3是一种引起小鼠新生儿糖尿病的扰动。
Mutations in GLIS3, which encodes a Krüppel-like zinc finger transcription factor, were found to underlie sporadic neonatal diabetes. Inactivation of Glis3 by gene targeting in mice was previously shown to lead to neonatal diabetes, but the underlying mechanism remains largely unknown. We aimed to elucidate the mechanism of action of GLIS family zinc finger 3 (GLIS3) in Glis3−/− mice and to further decipher its action in in-vitro systems. We created Glis3−/− mice and monitored the morphological and biochemical phenotype of their pancreatic islets at different stages of embryonic development. We combined these observations with experiments on Glis3 expressed in cultured cells, as well as in in vitro systems in the presence of other reconstituted components. In vivo and in vitro analyses placed Glis3 upstream of Neurog3, the endocrine pancreas lineage-defining transcription factor. We found that GLIS3 binds to specific GLIS3-response elements in the Neurog3 promoter, activating Neurog3 gene transcription both directly, and synergistically with hepatic nuclear factor 6 and forkhead box A2. These results indicate that GLIS3 controls fetal islet differentiation via direct transactivation of Neurog3, a perturbation that causes neonatal diabetes in mice.
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