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Open Access Green as soon as Postprint is submitted to ZB.
CHD4/Mi-2 beta activity is required for the positioning of the mesoderm/neuroectoderm boundary in Xenopus
Genes Dev. 21, 973-983 (2007)
Experiments in Xenopus have illustrated the importance of extracellular morphogens for embryonic gene regulation in vertebrates. Much less is known about how induction leads to the correct positioning of boundaries; for example, between germ layers. Here we report that the neuroectoderm/mesoderm boundary is controlled by the chromatin remodeling ATPase CHD4/Mi-2beta. Gain and loss of CHD4 function experiments shifted this boundary along the animal-vegetal axis at gastrulation, leading to excess mesoderm formation at the expense of neuroectoderm, or vice versa. This phenotype results from specific alterations in gene transcription, notably of the neural-promoting gene Sip1 and the mesodermal regulatory gene Xbra. We show that CHD4 suppresses Sip1 transcription by direct binding to the 5' end of the Sip1 gene body. Furthermore, we demonstrate that CHD4 and Sip1 expression levels determine the "ON" threshold for Nodal-dependent but not for eFGF-dependent induction of Xbra transcription. The CHD4/Sip1 epistasis thus constitutes a regulatory module, which balances mesoderm and neuroectoderm formation.
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Publication type
Article: Journal article
Document type
Scientific Article
Keywords
CHD4/Mi-2beta; Sip1; Xbra; chromatin remodeling; Activin induction threshold; germ layer
ISSN (print) / ISBN
0890-9369
e-ISSN
1549-5477
Journal
Genes and Development
Quellenangaben
Volume: 21,
Issue: 8,
Pages: 973-983
Publisher
Cold Spring Harbor Laboratory Press
Non-patent literature
Publications
Reviewing status
Peer reviewed
Institute(s)
Institute of Molecular Immunology (IMI)