Transcriptional integration of competence modulated by mutual repression generates cell-type specificity within the cardiogenic mesoderm

Zhe Han, Miki Fujioka, Mingtsan Su, Margaret Liu, James B. Jaynes, Rolf Bodmer

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48 引文 斯高帕斯(Scopus)

摘要

The way in which spatially patterned cellular identities are generated is a central question of organogenesis. In the case of Drosophila heart formation, the cardiac progenitors are specified in precise mesodermal positions, giving rise to multiple cell types in a highly ordered arrangement. Here, we study the mechanisms by which positional information conveyed by signaling pathways and a combinatorial code of activating and repressing transcription factors work together to confine the expression of the homeobox gene even-skipped (eve) to a small region of the dorsal mesoderm. By manipulating both expression patterns and binding sites for transcription factors, we show that a complex combination of regulatory activities converge on a single enhancer of eve to generate precisely targeted gene expression within the cardiac mesoderm. In particular, ladybird early (lbe), a homeobox gene expressed adjacent to eve, restricts the positive actions of factors downstream of wingless, decapentaplegic, and ras to generate the eve pattern. Mutation of a Lbe binding site causes dramatic expansion of expression and abolishes the responsiveness to repression by lbe. Conversely, eliminating eve in the mesoderm expands lbe expression into the normal eve-expressing territory, suggesting that mutual repression between eve and lbe is essential for delineating the spatial patterns of gene expression that specify cell types within the cardiac mesoderm.

原文英語
頁(從 - 到)225-240
頁數16
期刊Developmental Biology
252
發行號2
DOIs
出版狀態已發佈 - 2002

ASJC Scopus subject areas

  • Molecular Biology
  • Developmental Biology
  • Cell Biology

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