Developmental expression of the zebrafish Arf-like small GTPase paralogs arl13a and arl13b.

Developmental expression of the zebrafish Arf-like small GTPase paralogs arl13a and arl13b.
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DOI:
10.1016/j.gep.2018.07.002
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发表时间:
2018-09
期刊:
Gene expression patterns : GEP
影响因子:
--
通讯作者:
Perkins BD
Perkins BD
中科院分区:
其他
文献类型:
--
作者:
Song P;Perkins BD

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Arf样(Arl)小GTP结合蛋白家族的成员调节许多细胞功能,并且在纤毛结构和信号传导中起重要作用。小的GTdR Arl 13 a是Arl 13 b的一个密切的paramino,Arl 13 b是正常纤毛形成所需的小GTdR,当突变时会导致Joubert综合征。由于arl 13 b的突变导致斑马鱼视网膜缓慢变性,我们假设arl 13 a的表达可能提供功能冗余。我们确定了arl 13 a和arl 13 b在斑马鱼发育过程中的表达结构域,并通过荧光融合蛋白的表达检测了亚细胞定位。这两个基因在早期细胞分裂和原肠胚形成过程中广泛表达,Arl 13 a和Arl 13 b都定位于早期斑马鱼胚胎的纤毛和分裂细胞中的微管。在受精后2-5天(dpf),arl 13 b在神经组织中表达,而arl 13 a的表达被2dpf下调并限于颅面结构。这些结果表明arl 13 a和arl 13 b已经进化出不同的作用,并且arl 13 a在斑马鱼视网膜中不起作用。
Members of the Arf-like (Arl) family of small GTP-binding proteins regulate a number of cellular functions and play important roles in cilia structure and signaling. The small GTPase Arl13a is a close paralog to Arl13b, a small GTPase required for normal cilia formation that causes Joubert Syndrome when mutated. As mutation of arl13b causes a slow retinal degeneration in zebrafish, we hypothesized that expression of arl13a may provide functional redundancy. We determined the expression domains of arl13a and arl13b during zebrafish development and examined subcellular localization by expression of fluorescence fusion proteins. Both genes are widely expressed during early cell division and gastrulation and Arl13a and Arl13b both localize to microtubules in ciliated and dividing cells of the early zebrafish embryo. Between 2–5 days post fertilization (dpf), arl13b is expressed in neural tissues while expression of arl13a is downregulated by 2 dpf and restricted to craniofacial structures. These results indicate that arl13a and arl13b have evolved different roles and that arl13a does not function in the zebrafish retina.
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