Control of foot differentiation in Hydra: Phylogenetic footprinting indicates interaction of head, bud and foot patterning systems

Control of foot differentiation in Hydra: Phylogenetic footprinting indicates interaction of head, bud and foot patterning systems
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水螅足分化的控制:系统发育足迹表明头、芽和足图案系统的相互作用

DOI:
10.1016/j.mod.2005.04.010
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发表时间:
2005
影响因子:
2.6
通讯作者:
T. Bosch
T. Bosch
中科院分区:
生物学4区
文献类型:
--
作者:
S. Siebert;S. Thomsen;M. M. Reimer;T. Bosch

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同源结构域转录因子CnNK-2似乎在水螅足的形成中起主要作用。最近,我们报道了体外证据表明,CnNK-2具有自动调节功能,并调节形态发生肽pedibin的表达。我们提出,CnNK-2和pedibin协同协调足分化过程[Alfresen,S.,Till,A.,Wittlieb,J.,比茨,Khalturin,K.,博世,T. C.的方法,2004.水螅足分化的控制:NK-2同源框因子CnNK-2自动调节自身表达并使用pedibin作为靶基因的体外证据。机械设备121,195-204]。在这里,我们进一步分析了控制水螅足形成的调控网络。通过系统发育足迹法,我们比较了两个密切相关的物种,普通水螅和寡水螅的CnNK-2 5′-侧翼序列。出乎意料的是,我们在CnNK-2 5′-侧翼区检测到一个高度保守的HNF-3β(脊椎动物Forkhead转录因子)结合位点。水螅HNF-3β同源物芽头主要在体柱的顶端区域和出芽早期表达。Budhead不存在于表达CnNK-2的组织中,并且被认为参与决定用于头部分化的组织[Martinez,D.E.,Dirksen,M. L.,博德,P.M.,Jamrich,M.,斯蒂尔,R. E.,博德,人力资源部,1997. Budhead是一种叉头/HNF-3β同源物,在水螅的轴形成和头部规格期间表达。Dev. 192,523-536]。通过电泳迁移率变动分析,我们证明了重组芽头蛋白与CnNK-2 5′-侧翼区的种间保守HNF-3β结合基序之间的体外相互作用。我们的研究结果加强了CnNK-2作为一个重要的调节剂在足部图案化过程中的观点。此外,他们指出芽头作为CnNK-2转录调节因子的候选者,并在分子水平上指出水螅中脚和头模式化过程的相互作用。
Homeodomain transcription factor CnNK-2 seems to play a major role in foot formation in Hydra. Recently, we reported in vitro evidence indicating that CnNK-2 has autoregulatory features and regulates expression of the morphogenetic peptide pedibin. We proposed that CnNK-2 and pedibin synergistically orchestrate foot differentiation processes [Thomsen, S., Till, A., Wittlieb, J., Beetz, C., Khalturin, K., Bosch, T. C., 2004. Control of foot differentiation in Hydra: in vitro evidence that the NK-2 homeobox factor CnNK-2 autoregulates its own expression and uses pedibin as target gene. Mech. Dev. 121, 195–204]. Here, we further analyzed the regulatory network controlling foot formation in Hydra. By phylogenetic footprinting we compared the CnNK-2 5′-flanking sequence from two closely related species, Hydra vulgaris and Hydra oligactis. Unexpectedly, we detected a highly conserved binding site for HNF-3β, a vertebrate Forkhead transcription factor, in the CnNK-2 5′-flanking region. The Hydra HNF-3β homolog budhead is predominantly expressed in the apical region of the body column and early during budding. Budhead is absent from tissue expressing CnNK-2 and thought to be involved in determining tissue for head differentiation [Martinez, D.E., Dirksen, M.L., Bode, P. M., Jamrich, M., Steele, R.E., Bode, H.R., 1997. Budhead, a fork head/HNF-3β homolog, is expressed during axis formation and head specification in hydra. Dev. Biol. 192, 523–536]. By electrophoretic mobility shift assays we demonstrate an in vitro interaction between recombinant budhead protein and the interspecific conserved HNF-3β binding motif in the CnNK-2 5′-flanking region. Our results strengthen the view of CnNK-2 as an important regulator during foot patterning processes. Furtheron, they point to budhead as a candidate for a transcriptional regulator of CnNK-2 and to an interaction of foot and head patterning processes in Hydra on the molecular level.
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