Affiliation:
1. School of Food and Biological Engineering Hefei University of Technology Hefei People's Republic of China
2. School of Biological Science and Engineering North Minzu University Yinchuan People's Republic of China
3. Jiangsu Key Laboratory of Sericultural Biology and Biotechnology, School of Biotechnology Jiangsu University of Science and Technology Zhenjiang People's Republic of China
4. Key Laboratory of Silkworm and Mulberry Genetic Improvement, Ministry of Agriculture, Sericultural Research Institute Chinese Academy of Agricultural Sciences Zhenjiang People's Republic of China
Abstract
ABSTRACTOur previous research reported the influence of 50 μM selenium (Se) on the cytosolization (endocytosis) pathway, which in turn stimulates the growth and development of Bombyx mori. Lately, dynamin is recognized as one of the key proteins in endocytosis. To explore the underlying mechanisms of Se impact, the dynamin gene was knocked down by injecting siRNAs (Dynamin‐1, Dynamin‐2, and Dynamin‐3). This was followed by an analysis of the target gene and levels of silk protein genes, as well as growth and developmental indices, Se‐enrichment capacity, degree of oxidative damage, and antioxidant capacity of B. mori. Our findings showed a considerable decrease in the relative expression of the dynamin gene in all tissues 24 h after the interference and a dramatic decrease in the silkworm body after 48 h. RNAi dynamin gene decreased the silkworm body weight, cocoon shell weight, and the ratio of cocoon. In the meantime, malondialdehyde level increased and glutathione level and superoxide dismutase/catalase activities decreased. 50 μM Se markedly ameliorated these growth and physiological deficits as well as decreases in dynamin gene expression. On the other hand, there were no significant effects on fertility (including produced eggs and laid eggs) between the interference and Se treatments. Additionally, the Se content in the B. mori increased after the dynamin gene interference. The dynamin gene was highly expressed in the silk gland and declined significantly after interference. Among the three siRNAs (Dynamin‐1, Dynamin‐2, and Dynamin‐3), the dynamin‐2 displayed the highest interference effects to target gene expression. Our results demonstrated that 50 μM Se was effective to prevent any adverse effects caused by dynamin knockdown in silkworms. This provides practical implications for B. mori breeding industry.
Funder
National Natural Science Foundation of China