Hox transcription factors influence motoneuron identity through the integrated actions of both homeodomain and non-homeodomain regions.

Hox transcription factors influence motoneuron identity through the integrated actions of both homeodomain and non-homeodomain regions.
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DOI:
10.1002/dvdy.23763
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发表时间:
2012-04
影响因子:
2.5
通讯作者:
Lance-Jones, Cynthia
Lance-Jones, Cynthia
中科院分区:
生物学3区
文献类型:
--
作者:
Misra, Mala;Sours, Emily;Lance-Jones, Cynthia

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HOX转录因子在脊髓内运动神经元亚型的确定中起着关键作用。我们先前的工作表明,该家族的两个同源成员Hoxd10和Hoxd11对胚胎雏鸡腰骶(LS)脊髓中运动神经元的发育起相反的作用:Hoxd10促进投射到背肢肌肉的外侧运动神经元亚型的发育,而Hoxd11抑制外侧亚型的发育,有利于支配腹肢肌和轴肌的内侧亚型。Hoxd10和Hoxd11的DNA结合同源域之间惊人的同源性表明,非同源域区域介导了它们的不同作用。在本研究中,我们研究了Hoxd10和Hoxd11的同源结构域和非同源结构域区域对运动神经元规范的相对贡献。使用体内电穿孔技术表达LS运动神经元的嵌合和突变结构,我们发现Hoxd10的同源结构域和非同源结构域都是指定外侧运动神经元所必需的。相反,Hoxd11的非同源域区域足以抑制外侧运动神经元的命运,有利于中间的命运。总而言之,我们的数据表明,即使是密切相关的HOX同源基因也依赖于同源结构域依赖和非独立机制的不同组合来指定运动神经元的身份。
Hox transcription factors play a critical role in the specification of motoneuron subtypes within the spinal cord. Our previous work showed that two orthologous members of this family, Hoxd10 and Hoxd11, exert opposing effects on motoneuron development in the lumbosacral (LS) spinal cord of the embryonic chick: Hoxd10 promotes the development of lateral motoneuron subtypes that project to dorsal limb muscles, while Hoxd11 represses the development of lateral subtypes in favor of medial subtypes that innervate ventral limb muscles and axial muscles. The striking degree of homology between the DNA-binding homeodomains of Hoxd10 and Hoxd11 suggested that non-homeodomain regions mediate their divergent effects. In the present study, we investigate the relative contributions of homeodomain and non-homeodomain regions of Hoxd10 and Hoxd11 to motoneuron specification. Using in ovo electroporation to express chimeric and mutant constructs in LS motoneurons, we find that both the homeodomain and non-homeodomain regions of Hoxd10 are necessary to specify lateral motoneurons. In contrast, non-homeodomain regions of Hoxd11 are sufficient to repress lateral motoneuron fates in favor of medial fates. Together, our data demonstrate that even closely related Hox orthologues rely on distinct combinations of homeodomain-dependent and -independent mechanisms to specify motoneuron identity.
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