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Negative spatial regulation of the lineage specific CyIIIa actin gene in the sea urchin embryo

Hough-Evans, Barbara R. and Franks, Roberta R. and Zeller, Robert W. and Britten, Roy J. and Davidson, Eric H. (1990) Negative spatial regulation of the lineage specific CyIIIa actin gene in the sea urchin embryo. Development, 110 (1). pp. 41-50. ISSN 0950-1991.

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The CyIIIa·CAT fusion gene was injected into Strongylocentrotus purpuratus eggs, together with excess ligated competitor sequences representing subregions of the CyIIIa regulatory domain. In this construct, the chloramphenicol acetyltransferase (CAT) reporter gene is placed under the control of the 2300 nucleotide upstream regulatory domain of the lineage-specific CyIIIa cytoskeletal actin gene. CAT mRNA was detected by in situ hybridization in serial sections of pluteus stage embryos derived from the injected eggs. When carrier DNA lacking competitor CyIIIa fragments was coinjected with CyIIIa.CAT, CAT mRNA was observed exclusively in aboral ectoderm cells, i.e. the territory in which the CyIIIa gene itself is normally expressed (as also reported by us previously). The same result was obtained when five of seven different competitor subfragments bearing sites of DNA-protein interaction were coinjected. However, coinjection of excess quantities of either of two widely separated, nonhomologous fragments of the CyIIIa regulatory domain produced a dramatic ectopic expression of CAT mRNA in the recipient embryos. CAT mRNA was observed in gut, mesenchyme cells and oral ectoderm in these embryos. We conclude that these fragments contain regulatory sites that negatively control spatial expression of the CyIIIa gene.

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Additional Information:Copyright © 1990 by Company of Biologists. (Accepted 1 June 1990) This research was supported by a grant from the National Institutes of Health [HD-05753]. RWZ is supported by an NIH Training Grant [GM-07616].
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Subject Keywords:sea urchin embryo, lineage specific, Cyllla actin gene, negative spatial regulation
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Record Number:CaltechAUTHORS:HOUdev90
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Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:12581
Deposited By: Archive Administrator
Deposited On:13 Dec 2008 03:02
Last Modified:03 Oct 2019 00:29

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