Document Detail

Interaction between Drosophila bZIP proteins Atf3 and Jun prevents replacement of epithelial cells during metamorphosis.
MedLine Citation:
PMID:  20023169     Owner:  NLM     Status:  MEDLINE    
Epithelial sheet spreading and fusion underlie important developmental processes. Well-characterized examples of such epithelial morphogenetic events have been provided by studies in Drosophila, and include embryonic dorsal closure, formation of the adult thorax and wound healing. All of these processes require the basic region-leucine zipper (bZIP) transcription factors Jun and Fos. Much less is known about morphogenesis of the fly abdomen, which involves replacement of larval epidermal cells (LECs) with adult histoblasts that divide, migrate and finally fuse to form the adult epidermis during metamorphosis. Here, we implicate Drosophila Activating transcription factor 3 (Atf3), the single ortholog of human ATF3 and JDP2 bZIP proteins, in abdominal morphogenesis. During the process of the epithelial cell replacement, transcription of the atf3 gene declines. When this downregulation is experimentally prevented, the affected LECs accumulate cell-adhesion proteins and their extrusion and replacement with histoblasts are blocked. The abnormally adhering LECs consequently obstruct the closure of the adult abdominal epithelium. This closure defect can be either mimicked and further enhanced by knockdown of the small GTPase Rho1 or, conversely, alleviated by stimulating ecdysone steroid hormone signaling. Both Rho and ecdysone pathways have been previously identified as effectors of the LEC replacement. To elicit the gain-of-function effect, Atf3 specifically requires its binding partner Jun. Our data thus identify Atf3 as a new functional partner of Drosophila Jun during development.
Petra Sekyrova; Dirk Bohmann; Marek Jindra; Mirka Uhlirova
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Publication Detail:
Type:  Journal Article; Research Support, N.I.H., Extramural; Research Support, Non-U.S. Gov't    
Journal Detail:
Title:  Development (Cambridge, England)     Volume:  137     ISSN:  1477-9129     ISO Abbreviation:  Development     Publication Date:  2010 Jan 
Date Detail:
Created Date:  2009-12-21     Completed Date:  2010-01-27     Revised Date:  2011-07-19    
Medline Journal Info:
Nlm Unique ID:  8701744     Medline TA:  Development     Country:  England    
Other Details:
Languages:  eng     Pagination:  141-50     Citation Subset:  IM    
Biology Center, Czech Academy of Sciences and Department of Molecular Biology, University of South Bohemia, Ceske Budejovice 37005, Czech Republic.
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MeSH Terms
Activating Transcription Factor 3 / genetics,  metabolism*
Drosophila / growth & development*,  metabolism*
Drosophila Proteins / genetics,  metabolism*
Electrophoretic Mobility Shift Assay
Epithelial Cells / cytology*,  metabolism*
Gene Expression Regulation, Developmental / genetics,  physiology
Microscopy, Confocal
Protein Binding
Proto-Oncogene Proteins c-jun / genetics,  metabolism*
Grant Support
Reg. No./Substance:
0/Activating Transcription Factor 3; 0/Drosophila Proteins; 0/Proto-Oncogene Proteins c-jun

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