Drosophila transcription factor NF-Y suppresses transcription of the lipase 4 gene, a key gene for lipid storage

Autor: Yasuhide, Yoshioka, Keisuke, Anzai, Ryosuke, Kowada, Ken, Hiratsuka, Teppei, Hirayabu, Masashi, Yasuda, Yasuyuki, Ohkawa, Tetsuya, Sato, Mikita, Suyama, Hideki, Yoshida, Masamitsu, Yamaguchi
Rok vydání: 2022
Předmět:
Zdroj: Experimental Cell Research. 420:113307
ISSN: 0014-4827
DOI: 10.1016/j.yexcr.2022.113307
Popis: The CCAAT motif-binding factor NF-Y consists of three different subunits, NF-YA, NF-YB, and NF-YC. Although it is suggested that NF-Y activity is essential for normal tissue homeostasis, survival, and metabolic function, its precise role in lipid metabolism is not clarified yet. In Drosophila, eye disc specific knockdown of Drosophila NF-YA (dNF-YA) induced aberrant morphology of the compound eye, the rough eye phenotype in adults and mutation of the lipase 4 (lip4) gene suppressed the rough eye phenotype. RNA-seq analyses with dNF-YA knockdown third instar larvae identified the lip4 gene as one of the genes that are up-regulated by the dNF-YA knockdown. We identified three dNF-Y-binding consensuses in the 5'flanking region of the lip4 gene, and a chromatin immunoprecipitation assay with the specific anti-dNF-YA IgG demonstrated dNF-Y binding to this genomic region. The luciferase transient expression assay with cultured Drosophila S2 cells and the lip4 promoter-luciferase fusion genes with and without mutations in the dNF-Y-binding consensuses showed that each of the three dNF-Y consensus sequences negatively regulated lip4 gene promoter activity. Consistent with these results, qRT-PCR analysis with the dNF-YA knockdown third instar larvae revealed that endogenous lip4 mRNA levels were increased by the knockdown of dNF-YA in vivo. The specific knockdown of dNF-YA in the fat body with the collagen-GAL4 driver resulted in smaller oil droplets in the fat body cells. Collectively, these results suggest that dNF-Y is involved in lipid storage through its negative regulation of lip4 gene transcription.
Databáze: OpenAIRE
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