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E74 knockdown represses larval development and chitin synthesis in Hyphantria cunea
Bihan Zhang1, Bin Yao1, Xingpeng Li2
1School of Forestry, Northeast Forestry University, Harbin 150040, PR China.
Pesticide Biochemistry and Physiology
|September 20, 2022
Summary
The E74 transcription factor is crucial for Hyphantria cunea larval development and molting. This study reveals HcE74 regulates chitin biosynthesis genes, impacting chitin content in larvae.
Area of Science:
- Entomology
- Molecular Biology
- Biochemistry
Background:
- The transcription factor E74 is vital for insect development, regulating processes like metamorphosis.
- Its role in insect chitin biosynthesis, essential for the exoskeleton, remains largely uninvestigated.
Purpose of the Study:
- To identify and characterize the E74 gene (HcE74) in Hyphantria cunea.
- To elucidate the function of HcE74 in larval growth, development, molting, and chitin synthesis.
Main Methods:
- Bioinformatic analysis to determine HcE74 homology.
- RNA interference (RNAi) to knockdown HcE74 expression in H. cunea larvae.
- Quantitative analysis of chitin content and expression of chitin synthesis-related genes.
Main Results:
- HcE74 shares high homology with other insect E74 proteins.
- HcE74 knockdown resulted in significant larval mortality (51.11%) and developmental deformities.
- Silencing HcE74 decreased the expression of key chitin synthesis genes (HcG6PI, HcUAP, HcCHSA, HcCHSB) and reduced chitin content.
Conclusions:
- HcE74 is essential for H. cunea larval growth, development, and molting.
- HcE74 likely plays a regulatory role in chitin biosynthesis by controlling the expression of relevant genes.
