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Open Access Green as soon as Postprint is submitted to ZB.
Notch signalling is required for cyclic expression of the hairy-like gene HES1 in the presomitic mesoderm.
Development 127, 1421-1429 (2000)
Somitic segmentation provides the framework on which the segmental pattern of the vertebrae, some muscles and the peripheral nervous system is established. Recent evidence indicates that a molecular oscillator, the ‘segmentation clock’, operates in the presomitic mesoderm (PSM) to direct periodic expression of c-hairy1 and lunatic fringe (l-fng). Here, we report the identification and characterisation of a second avian hairy-related gene, c-hairy2, which also cycles in the PSM and whose sequence is closely related to the mammalian HES1 gene, a downstream target of Notch signalling in vertebrates. We show that HES1 mRNA is also expressed in a cyclic fashion in the mouse PSM, similar to that observed for c-hairy1 and c-hairy2 in the chick. In HES1 mutant mouse embryos, the periodic expression of l-fng is maintained, suggesting that HES1 is not a critical component of the oscillator mechanism. In contrast, dynamic HES1 expression is lost in mice mutant for Delta1, which are defective for Notch signalling. These results suggest that Notch signalling is required for hairy-like genes cyclic expression in the PSM.
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Publication type
Article: Journal article
Document type
Scientific Article
Keywords
Presomitic mesoderm HES hairy-related genes lunatic fringe Notch signalling Chick Mouse
ISSN (print) / ISBN
0950-1991
e-ISSN
1477-9129
Quellenangaben
Volume: 127,
Pages: 1421-1429
Publisher
Company of Biologists
Non-patent literature
Publications
Reviewing status
Peer reviewed
Institute(s)
Institute of Experimental Genetics (IEG)