Co-activation of microRNAs by Zelda is essential for early drosophila development

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Title:	Co-activation of microRNAs by Zelda is essential for early drosophila development
Authors:	粘仲毅;Fu, Shengbo;Nien, Chung-Yi;Liang, Hsiao-Lan;Rushlow, Christine
Contributors:	生醫理工學院生命科學系
Keywords:	Animals;Animals, Genetically Modified;Body Patterning - genetics;Drosophila melanogaster - embryology;Drosophila melanogaster - genetics;Drosophila Proteins - genetics;Drosophila Proteins - physiology;Embryo, Nonmammalian;Gene Expression Regulation, Developmental;Gene Regulatory Networks;MicroRNAs - genetics;RNA, Messenger, Stored - genetics;Time Factors;Transcription Factors - genetics;Transcription Factors - physiology;Transcriptional Activation;Zygote - growth & development;Zygote - metabolism
Date:	2014-01-01
Issue Date:	2026-04-23 11:12:10 (UTC+8)
Publisher:	Company of Biologists Ltd;England: The Company of Biologists
Abstract:	摘要： Transcription factors and microRNAs (miRNAs) are two important classes of trans-regulators in differential gene expression. Transcription factors occupy cis-regulatory motifs in DNA to activate or repress gene transcription, whereas miRNAs specifically pair with seed sites in target mRNAs to trigger mRNA decay or inhibit translation. Dynamic spatiotemporal expression patterns of transcription factors and miRNAs during development point to their stage- and tissue-specific functions. Recent studies have focused on miRNA functions during development; however, much remains to explore regarding how the expression of miRNAs is initiated and how dynamic miRNA expression patterns are achieved by transcriptional regulatory networks at different developmental stages. Here, we focused on the identification, regulation and function of miRNAs during the earliest stage of Drosophila development, when the maternal-to-zygotic transition (MZT) takes place. Eleven miRNA clusters comprise the first set of miRNAs activated in the blastoderm embryo. The transcriptional activator Zelda is required for their proper activation and regulation, and Zelda binding observed in genome-wide binding profiles is predictive of enhancer activity. In addition, other blastoderm transcription factors, comprising both activators and repressors, the activities of which are potentiated and coordinated by Zelda, contribute to the accurate temporal and spatial expression of these miRNAs, which are known to function in diverse developmental processes. Although previous genetic studies showed no early phenotypes upon loss of individual miRNAs, our analysis of the miR-1; miR-9a double mutant revealed defects in gastrulation, demonstrating the importance of co-activation of miRNAs by Zelda during the MZT. 其他題名： Development 出版者： England: The Company of Biologists 出版日期： 2014-05-01 出處： Development, 2014-05, Vol.141 (10), p.2108-2118 版權： 2014. Published by The Company of Biologists Ltd 2014 識別號： ISSN: 0950-1991 識別號： ISSN: 1477-9129 識別號： EISSN: 1477-9129 識別號： DOI: 10.1242/dev.108118 識別號： PMID: 24764079
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