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Hox genes and axial specification in vertebrates

机译:Hox基因和脊椎动物的轴向规格

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摘要

The colinear, anterior to posterior expression domains of the Hox genes in vertebrate embryos is strongly correlated with regional changes in vertebral morphology. The limbs of tetrapods are consistently aligned with specific areas of the vertebral column. However, control of limb development is apparently situated in the lateral plate mesoderm, and has been experimentally shown to be independent of an axial Hox code (Cohn et aL, 1997, Nature 387:97-101). We have used experimental manipulation of chick embryos to test the causal role of Hox genes in patterning derivatives of the paraxial mesoderm. Hox expression in heterotopically transplanted segmental plate responds in a manner consistent with a patterning role for these genes in the morphological behavior of the transplants. Expression is maintained in dorsal paraxial regions where patterning is also intrinsic to the donor site of the graft. However, expression is apparently lost in somite cells that migrate into the host lateral plate environment and form appropriate host-level muscles. This arrangement could enable increased plasticity in the evolution of transpositional variation in the vertebrate body plan.
机译:脊椎动物胚胎中Hox基因的共线性,前后表达域与椎骨形态的区域变化密切相关。四足动物的四肢始终与椎骨的特定区域对齐。然而,肢体发育的控制显然位于侧板中胚层中,并且已经通过实验证明其独立于轴向霍克斯编码(Cohn等,1997,Nature 387:97-101)。我们已经使用了雏鸡胚胎的实验操作来测试Hox基因在模式化近轴中胚层衍生物中的因果作用。异位移植的节段板中的Hox表达以与这些基因在移植物形态行为中的模式作用一致的方式响应。在背侧近轴区保持表达,其中图案化对于移植物的供体位点也是固有的。但是,表达体明显消失在迁移到宿主侧板环境中并形成合适宿主水平肌肉的体节细胞中。这种安排可以使脊椎动物身体计划中的转座变异进化中增加可塑性。

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