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Hormone-inducible expression of secreted factors in zebrafish embryos.
Development, Growth & Differentiation 1998 December
The study of gene function at later stages of embryonic development by overexpression experiments is often complicated by genes exerting different functions at multiple stages of development, which renders analysis of stage-specific effects difficult. To address this problem an inducible expression system that supports timed expression of essentially any protein, including secreted proteins was designed. The system is based on a two step mechanism. A glucocorticoid inducible, Gal4-site binding chimeric transcription factor is expressed ubiquitously, whereas a gene of interest is placed under the control of a Gal4-site driven promoter. Treatment of zebrafish embryos injected with such constructs with the synthetic glucocorticoid dexamethasone results in readily detectable reporter activity within 3 h. The system was tested with induced expression of Xactivin(beta)B and X(wnt), which both were shown to induce morphological abnormalities, as well as alterations in the expression patterns of goosecoid and otx2, respectively. Coinjection of an inducible lacZ reporter vector served as an indicator for expressing cells in embryos. The present results demonstrate that this is a versatile inducible expression system for use in vertebrate embryos, that also supports expression of secreted proteins.
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