RRC ID 64382
Author Huang DY, Xia XL, Huang R, Li S, Yuan DW, Liu SN.
Title The steroid-induced microRNA let-7 regulates developmental growth by targeting cdc7 in the Drosophila fat body.
Journal Insect Sci
Abstract In insects, 20-hydroxyecdysone (20E) limits systemic growth by triggering developmental transitions. Previous studies have shown that 20E-induced let-7 exhibits crosstalk with the cell cycle. Here, we examined the underlying molecular mechanisms and physiological functions of 20E-induced let-7 in the fat body, an organ for energy storage and nutrient mobilization which plays a critical role in the larval growth. First, the overexpression of let-7 decreased the body size and led to the reduction of both nucleolus and cell sizes in the larval fat body. In contrast, the overexpression of let-7-Sponge increased the nucleolus and cell sizes. Moreover, we found that cdc7, encoding a conserved protein kinase that controls the endocycle, is a target of let-7. Notably, the mutation of cdc7 in the fat body resulted in growth defects. Overall, our findings revealed a novel role of let-7 in the control of endoreduplication-related growth during larval-prepupal transition in Drosophila.
Volume 28(6)
Pages 1621-1632
Published 2021-12-1
DOI 10.1111/1744-7917.12878
PMID 33089948
MeSH Animals Drosophila / genetics Drosophila / growth & development* Drosophila Proteins* / genetics Drosophila Proteins* / metabolism Ecdysterone Fat Body* / metabolism Larva MicroRNAs* / genetics Protein Serine-Threonine Kinases* / genetics Protein Serine-Threonine Kinases* / metabolism
IF 2.791
Resource
Drosophila DGRC#111927 DGRC#114359