G蛋白偶联受体和homeobox基因在卤虫早期发育脑神经节中的潜在调控作用

POTENTIAL REGULATORY ROLES OF G PROTEIN-COUPLED RECEPTORS AND HOMEOBOX GENES IN THE CEREBRAL GANGLION OF ARTEMIA DURING EARLY DEVELOPMENT

  • 摘要: 为揭示卤虫变态发育过程中的神经调控机制, 研究报告了孤雌生殖卤虫三个典型发育阶段脑神经节的转录动态, 鉴定了各阶段特异表达的基因并预测了其功能。结果表明: 第1龄期的高表达基因(HEG)涉及大量的有机物代谢和免疫调节, 如含硫化合物转运及鸟氨酸代谢; 第3龄期的HEGs与细胞呼吸、甲基化和嘌呤代谢相关; 第8龄期的HEGs涉及神经信号传递和细胞间识别。其中, G蛋白偶联受体(GPCR)和homeobox基因在第3和第8龄期显著高表达, 继而探讨了这些基因的亚家族表达特征及功能, 如视蛋白受体、神经活性配体受体和嗅觉受体这类GPCRs在幼体发育的相对后期阶段显著高表达, homeobox基因家族中的Unc-42ArxCeh-14在第3龄期高表达, ArxCeh-14Nkx2Phox在第8龄期高表达。总之, 第1龄期幼体通过增强代谢和物质运输来支持其快速生长, 第3龄期到第8龄期是细胞分化和神经系统成熟的关键阶段, GPCRhomeobox的高表达提示了卤虫视觉发育及神经系统的进一步特化。研究不仅提供了一组脑神经节转录组数据, 还为认识卤虫的发育机制及深入理解神经调控在甲壳动物变态发育过程中的作用提供了新线索。

     

    Abstract: : Artemia, a small aquatic crustacean widely distributed in saline and alkali environments, represents as a valuable model for investigating gene regulation mechanisms in crustacean development. Under favorable conditions, Artemia larvae, complete metamorphosis through multiple molts within 2-4 weeks, but the neural regulation mechanisms involved in individual development are currently unclear. This study reports on the transcriptional dynamics of the cerebral ganglia across three developmental stages, identifying genes specifically expressed at each stage and predicting their functions. In the instar I stage, highly expressed genes (HEGs) are primarily involved in the metabolism of organic compounds and immune regulation, including sulfur compound transport and ornithine metabolism. In instar III, HEGs are related to cellular respiration, methylation, and purine metabolism, while in instar VIII, they are associated with neural signal transmission and cell-cell recognition. Notably, G protein-coupled receptors (GPCRs) and homeobox genes are significantly highly expressed in the instar III and instar VIII stages. The functions of these gene subfamilies were further explored: GPCRs, such as opsin receptors, neuroactive ligand receptors, and olfactory receptors, are highly expressed in the relatively later stages of larval development. Homeobox genes, including Unc-42, Arx, and Ceh-14 are highly expressed in instar III stage, while Arx, Ceh-14, Nkx2, and Phox are highly expressed in instar VIII stage. The results indicate that instar I larvae grow efficiently by enhancing metabolism and substance transport, while instar III to VII is an important stage for cell differentiation and nervous system maturation. The increased expression of GPCRs and homeobox genes during this time points to further visual development and nervous system specialization in Artemia. This study provides a comprehensive transcriptome dataset of cerebral ganglion and offers insights into the developmental mechanisms of Artemia, shedding light on the neural regulatory roles in crustacean development.

     

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