Dong Shunan, Li Kunze, Zang He, Song Yuxuan, Kang Jing, Chen Ying, Du Liting, Wang Ning, Chen Dafu, Luo Qingming, Yan Tizhen, Guo Rui, Qiu Jianfeng
College of Bee Science and Biomedicine, Fujian Agriculture and Forestry University, Fuzhou, Fujian, China.
National and Local United Engineering Laboratory of Natural Biotoxin, Fuzhou, Fujian, China.
Front Physiol. 2024 Sep 27;15:1475306. doi: 10.3389/fphys.2024.1475306. eCollection 2024.
The miRNA plays a key role in the regulation of hormone signaling in insects. The pathways by which miRNAs affect hormone levels are unclear in the honeybee (), an indispensable pollinator in nature. In this study, ame-miR-5119 was overexpressed and knocked down in larvae by feeding mimics and inhibitors, respectively, and we determined that ame-miR-5119 regulates hormone signaling through the target gene ecdysis triggering hormone (), which affects the larval-pupal transition of workers. The results showed that ame-miR-5119 with a length of 19 nt targets six genes related to the hormone pathway. We focused on and found that ame-miR-5119 and exhibited reverse expression patterns during the transition from larval to pupal stages in workers. Dual luciferase assay confirmed the negative regulatory between ame-miR-5119 and . Overexpression of ame-miR-5119 decreased the mRNA level of , and the Eth receptor () expression was not significantly affected, but the expression levels of juvenile hormone (JH) pathway related genes () and 1 (1) were significantly reduced. In contrast, knockdown of ame-miR-5119 increased the mRNA level of , and the expression of , and 1 was significantly upregulated. ame-miR-5119 did not affect larval body weight. The number of larvae overexpressing ame-miR-5119 survived in the prepupal stage was lower than that in the control group, and the number of pupations reduced at 11-day-old. The number of larvae that knocked down ame-miR-5119 survived in the prepupal stage was significantly higher than that in the control group, and the number of pupations increased at 11-day-old. These results indicated that ame-miR-5119 negatively regulates the expression of , indirectly inhibits the expression of , , and -1, and affects the JH biosynthesis, thereby preventing the metamorphic transition from larva to pupa in worker bees. These findings provide evidence that the miRNA regulation of hormone levels in honey bees.
微小RNA(miRNA)在昆虫激素信号调节中起关键作用。在自然界中不可或缺的传粉者蜜蜂中,miRNA影响激素水平的途径尚不清楚。在本研究中,分别通过喂食模拟物和抑制剂在幼虫中过表达和敲低ame-miR-5119,我们确定ame-miR-5119通过靶基因蜕皮触发激素调节激素信号,这影响工蜂的幼虫-蛹转变。结果表明,长度为19 nt的ame-miR-5119靶向六个与激素途径相关的基因。我们聚焦于[具体基因名称缺失],发现ame-miR-5119和[具体基因名称缺失]在工蜂从幼虫到蛹阶段的转变过程中呈现相反的表达模式。双荧光素酶测定证实了ame-miR-5119与[具体基因名称缺失]之间的负调控。ame-miR-5119的过表达降低了[具体基因名称缺失]的mRNA水平,蜕皮激素受体(Eth受体)的表达没有受到显著影响,但保幼激素(JH)途径相关基因[具体基因名称缺失]和[具体基因名称缺失]1([具体基因名称缺失]1)的表达水平显著降低。相反,敲低ame-miR-5119增加了[具体基因名称缺失]的mRNA水平,[具体基因名称缺失]、[具体基因名称缺失]和[具体基因名称缺失]1的表达显著上调。ame-miR-5119不影响幼虫体重。过表达ame-miR-5119的幼虫在预蛹期存活的数量低于对照组,在11日龄时化蛹数量减少。敲低ame-miR-5119的幼虫在预蛹期存活的数量显著高于对照组,在11日龄时化蛹数量增加。这些结果表明,ame-miR-5119负调控[具体基因名称缺失]的表达,间接抑制[具体基因名称缺失]、[具体基因名称缺失]和[具体基因名称缺失]-1的表达,并影响JH生物合成,从而阻止工蜂从幼虫到蛹的变态转变。这些发现为蜜蜂中miRNA对激素水平的调节提供了证据。