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Development, Vol 125, Issue 4 767-775, Copyright © 1998 by Company of Biologists
JOURNAL ARTICLES |
R Crowe, D Henrique, D Ish-Horowicz and L Niswander
Cell Biology Program, Memorial Sloan-Kettering Cancer Center, New York, NY 10021, USA.
Chick embryonic feather buds arise in a distinct spatial and temporal pattern. Although many genes are implicated in the growth and differentiation of the feather buds, little is known about how the discrete pattern of the feather array is formed and which gene products may be involved. Possible candidates include Notch and its ligands, Delta and Serrate, as they play a role in numerous cell fate decisions in many organisms. Here we show that Notch-1 and Notch-2 mRNAs are expressed in the skin in a localized pattern prior to feather bud initiation. In the early stages of feather bud development, Delta-1 and Notch-1 are localized to the forming buds while Notch-2 expression is excluded from the bud. Thus, Notch and Delta-1 are expressed at the correct time and place to be players in the formation of the feather pattern. Once the initial buds form, expression of Notch and its ligands is observed within each bud. Notch-1 and -2 and Serrate-1 and -2 are expressed throughout the growth and differentiation of the feathers whereas Delta-1 transcripts are downregulated. We have also misexpressed chick Delta-1 using a replication competent retrovirus. This results in induction of Notch-1 and-2 and a loss of feather buds from the embryo in either large or small patches. In large regions of Delta-1 misexpression, feathers are lost throughout the infected area. In contrast, in small regions of misexpression, Delta-1 expressing cells differentiate into feather buds more quickly than normal and inhibit their neighbors from accepting a feather fate. We propose a dual role for Delta-1 in promoting feather bud development and in lateral inhibition. These results implicate the Notch/Delta receptor ligand pair in the formation of the feather array.
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