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A Transcriptome Insight During Early Fish Larval Development Followed by Starvation in Seriola rivoliana
Marine Biotechnology ( IF 2.6 ) Pub Date : 2021-10-13 , DOI: 10.1007/s10126-021-10061-4
Danitzia A Guerrero-Tortolero 1 , Grecia Vázquez-Islas 1 , Rafael Campos-Ramos 1
Affiliation  

We investigated a time-course larval transcriptional analysis (RNA-seq) in the longfin yellowtail Seriola rivoliana, from hatching to day four at 22 °C, without providing zooplankton as food. Larval starvation is a critical physiological stage that must be prevented to ensure survival. However, the transcriptional mechanisms to endure starvation have not been investigated in marine fish. Differential gene expression showed newly day-specific transcriptome events during larval development. On day 1 (yolk sac absorption), the predominant upregulated developmental processes were larval growth, muscle and vision development, cytoskeletal structure, protein synthesis, protein and fat digestion-absorption, and hormone biosynthesis, whereas the cell cycle was suppressed. On day 2 (yolk sac exhaustion), a new stage of energy regeneration (ATP) was supplied by the oil drop reserve, whereas protein digestion-absorption and growth were suppressed. On day 3 (mouth opening and starvation), stress signals and nutrition deprivation upregulated the p53 signal and triggered autophagy and the AMP-activated protein kinase (AMPK) pathways as an alternative catabolic pathway to enduring starvation, and the circadian rhythm was established. On day 4 (starving and weakened larvae condition), autophagy supported subsequent protein synthesis, activated the immune system, and promoted estrogen signaling and skeleton renovation. However, larvae suppressed muscle development, vision and carbohydrate, and fat digestion-absorption and became lethargic, evidencing limited physiological support by autophagy to maintain survival without exogenous nutrition in this species.



中文翻译:

早期鱼类幼虫发育过程中的转录组洞察,随后是 Seriola rivoliana 中的饥饿

我们在长鳍鰤鱼Seriola rivoliana 中研究了时程幼虫转录分析 (RNA-seq),从孵化到 22 °C 的第四天,不提供浮游动物作为食物。幼虫饥饿是一个关键的生理阶段,必须防止以确保生存。然而,尚未在海鱼中研究忍受饥饿的转录机制。差异基因表达在幼虫发育过程中显示出新的一天特异性转录组事件。在第 1 天(卵黄囊吸收),主要的上调发育过程是幼虫生长、肌肉和视力发育、细胞骨架结构、蛋白质合成、蛋白质和脂肪消化吸收以及激素生物合成,而细胞周期受到抑制。在第 2 天(卵黄囊耗尽),油滴储备提供了能量再生(ATP)的新阶段,而蛋白质消化吸收和生长受到抑制。在第 3 天(张嘴和饥饿),压力信号和营养剥夺上调了 p53 信号并触发了自噬和 AMP 活化蛋白激酶 (AMPK) 途径,作为持久饥饿的替代分解代谢途径,并建立了昼夜节律。在第 4 天(饥饿和弱化幼虫状态),自噬支持随后的蛋白质合成,激活免疫系统,并促进雌激素信号传导和骨骼更新。然而,幼虫抑制肌肉发育、视力和碳水化合物以及脂肪的消化吸收并变得昏昏欲睡,证明自噬在该物种没有外源营养的情况下维持生存的生理支持有限。压力信号和营养剥夺会上调 p53 信号并触发自噬和 AMP 活化蛋白激酶 (AMPK) 途径,作为持久饥饿的替代分解代谢途径,并建立了昼夜节律。在第 4 天(饥饿和弱化幼虫状态),自噬支持随后的蛋白质合成,激活免疫系统,并促进雌激素信号传导和骨骼更新。然而,幼虫抑制肌肉发育、视力和碳水化合物以及脂肪的消化吸收并变得昏昏欲睡,证明自噬在该物种没有外源营养的情况下维持生存的生理支持有限。压力信号和营养剥夺会上调 p53 信号并触发自噬和 AMP 活化蛋白激酶 (AMPK) 途径,作为持久饥饿的替代分解代谢途径,并建立了昼夜节律。在第 4 天(饥饿和弱化幼虫状态),自噬支持随后的蛋白质合成,激活免疫系统,并促进雌激素信号传导和骨骼更新。然而,幼虫抑制肌肉发育、视力和碳水化合物以及脂肪的消化吸收并变得昏昏欲睡,证明自噬在该物种没有外源营养的情况下维持生存的生理支持有限。自噬支持随后的蛋白质合成,激活免疫系统,并促进雌激素信号传导和骨骼更新。然而,幼虫抑制肌肉发育、视力和碳水化合物以及脂肪的消化吸收并变得昏昏欲睡,证明自噬在该物种没有外源营养的情况下维持生存的生理支持有限。自噬支持随后的蛋白质合成,激活免疫系统,并促进雌激素信号传导和骨骼更新。然而,幼虫抑制肌肉发育、视力和碳水化合物以及脂肪的消化吸收并变得昏昏欲睡,证明自噬在该物种没有外源营养的情况下维持生存的生理支持有限。

更新日期:2021-10-13
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