PITX2 regulates procollagen lysyl hydroxylase (PLOD) gene expression: implications for the pathology of Rieger syndrome.

PITX2 regulates procollagen lysyl hydroxylase (PLOD) gene expression: implications for the pathology of Rieger syndrome.
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DOI:
10.1083/jcb.152.3.545
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发表时间:
2001-02-05
期刊:
The Journal of cell biology
影响因子:
--
通讯作者:
Murray JC
Murray JC
中科院分区:
其他
文献类型:
--
作者:
Hjalt TA;Amendt BA;Murray JC

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Rieger综合征是一种常染色体显性遗传病,以眼部、颅面和脐部缺陷为特征。患者有PITX2突变,PITX2是一种成对的双核同源异型盒基因,也参与了左右两极的决定。在这项研究中,我们已经确定了一组负责胶原蛋白中羟化赖氨酸的酶的基因家族,作为PITX2转录调控的一组可能的同源靶标。用PITX2/Pitx2特异性抗体通过染色质沉淀法富集小鼠前胶原赖氨酸羟基酶(Plod)-2基因。PLOD-2和人类PLOD-1启动子一样,含有多个双核体(PITX2)结合元件。我们在体外展示了这些元件与PITX2的特异性结合。在共转染实验中,plod-1启动子在PITX2存在的情况下诱导荧光素酶报告基因的表达。导致PITX2突变体T68P的Rieger综合征不能诱导plod-1-荧光素酶。已知PLOD-1的突变和重排在Ehler-Danlos综合征(VI型脊柱侧凸)患者中普遍存在。Rieger综合征和EDVI涉及几个相同的器官系统。
The Rieger syndrome is an autosomal dominant disease characterized by ocular, craniofacial, and umbilical defects. Patients have mutations in PITX2, a paired-bicoid homeobox gene, also involved in left/right polarity determination. In this study we have identified a family of genes for enzymes responsible for hydroxylizing lysines in collagens as one group of likely cognate targets of PITX2 transcriptional regulation. The mouse procollagen lysyl hydroxylase (Plod)-2 gene was enriched for by chromatin precipitation using a PITX2/Pitx2-specific antibody. Plod-2, as well as the human PLOD-1 promoters, contains multiple bicoid (PITX2) binding elements. We show these elements to bind PITX2 specifically in vitro. The PLOD-1 promoter induces the expression of a luciferase reporter gene in the presence of PITX2 in cotransfection experiments. The Rieger syndrome causing PITX2 mutant T68P fails to induce PLOD-1–luciferase. Mutations and rearrangements in PLOD-1 are known to be prevalent in patients with Ehlers-Danlos syndrome, kyphoscoliosis type (type VI [EDVI]). Several of the same organ systems are involved in Rieger syndrome and EDVI.
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