Hoxd-4 Expression during Pharyngeal Arch Development in Flounder (Paralichthys olivaceus) Embryos and Effects of Retinoic Acid on Expression

Hoxd-4 Expression during Pharyngeal Arch Development in Flounder (Paralichthys olivaceus) Embryos and Effects of Retinoic Acid on Expression
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牙鲆 (Paralichthys olivaceus) 胚胎咽弓发育过程中 Hoxd-4 的表达及视黄酸对其表达的影响

DOI:
10.2108/zsj.15.57
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发表时间:
1998
影响因子:
3.3
通讯作者:
T. Kurokawa
T. Kurokawa
中科院分区:
医学3区
文献类型:
--
作者:
Tohru Suzuki;I. Oohara;T. Kurokawa

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摘要硬骨鱼有7个咽弓(下颌骨、舌骨和5个鳃弓),这些咽弓产生了颌骨和鳃,骨骼细胞群起源于颅神经嵴。变形(Dfd)组的表达前缘位于后脑和咽部区域。为了研究硬骨鱼咽部骨骼的形成,从牙鲆(Paralichthys olivaceus)胚胎cDNA文库中克隆了Hoxd-4基因,分析了Hoxd-4基因在胚胎发育过程中的表达模式以及视黄酸(RA)对其表达的影响。Hoxd-4在第21体节和第5体节之间的中枢神经系统中从第7节到脊髓,以及在鳃弓2后的咽部区域中表达。其表达随后被限制于鳃弓2-5的软骨前体细胞。当处于早期屏蔽期的胚胎暴露于浓度高于10−7 M的RA时,Hoxd-4表达的前缘以剂量依赖性方式向前移动,无论是在中枢神经系统还是咽部区域。我们建议,在鳃骨架的形成,Hoxd-4的功能在规格的区域身份之间的鳃弓1和2,和他们的身份是受治疗RA。
Abstract Teleost fish develop seven pharyngeal arches (mandible, hyoid and five gill arches) which give rise to the jaw and gills, and skeletal cell populations which originate from the cranial neural crest. The anterior border of expression of the Deformed (Dfd) group is located in the hindbrain and pharyngeal region. To investigate pharyngeal skeletal formation in the teleost fish, we cloned the cDNA coding Hoxd-4 from a cDNA library for flounder (Paralichthys olivaceus) embryos, and analyzed gene expression pattern during embryogenesis and the effects of retinoic acid (RA) on this gene expression. Between the 21-somite and prim-5 stages, Hoxd-4 was expressed in the central nervous system from rhombomere 7 to the spinal cord, and in the pharyngeal region posterior from gill arch 2. Its expression then became restricted to cartilage precursor cells of gill arches 2-5. When embryos in the early shield stage were exposed to RA at concentrations above 10−7 M, the anterior border of Hoxd-4 expression shifted anteriorly in a dose-dependent manner, both in the central nervous system and pharyngeal region. We propose that, during gill skeleton formation, Hoxd-4 functions in the specification of regional identity between gill arches 1 and 2, and that their identity is affected by treatment with RA.
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