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JOURNAL ARTICLES
Position-specific activity of the Hox1.1 promoter in transgenic mice
A.W. Puschel, R. Balling, P. Gruss
Development 1990 108: 435-442;
A.W. Puschel
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R. Balling
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P. Gruss
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Summary

During development, positional values have to be assigned to groups of cells. The murine Hox genes are a class of genes that are predicted to be involved at some stage in this process. During embryogenesis they are expressed in distinct overlapping region- and stage-specific patterns and therefore must be regulated in response to positional information. In this study, we have analysed the activity of Hox1.1 promoter sequences in transgenic mice. The use of lacZ as a marker allows a detailed analysis of expression at the single cell level during early embryonic development. We show that 3.6 kbp of promoter and 1.7 kbp of 3′ sequences provide sufficient regulatory information to express a transgene in a spatial and temporal manner indistinguishable from the endogenous Hox1.1 gene during the period of development when Hox1.1 expression is established. The activation occurs in a strict order in specific ectodermal and mesodermal domains. Within each of these domains the transgene is activated over a period of four hours apparently randomly in single cells. In a following second period, Hox1.1 and transgene expression patterns diverge. In this period, transgene expression persists in many mesodermally derived cells that do not express Hox1.1 indicating the absence of a negative regulatory element in the transgene. The anterior boundary of transgene expression is identical to that of Hox1.1. However, no posterior boundary of transgene expression is set, suggesting that a separate element absent from the transgene specifies this boundary.

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Position-specific activity of the Hox1.1 promoter in transgenic mice
A.W. Puschel, R. Balling, P. Gruss
Development 1990 108: 435-442;
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Position-specific activity of the Hox1.1 promoter in transgenic mice
A.W. Puschel, R. Balling, P. Gruss
Development 1990 108: 435-442;

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