Tissue- and stage-specific modulation of Wingless signaling by the segment polarity gene lines

AUTOR(ES)

Hatini, Victor

FONTE

Cold Spring Harbor Laboratory Press

RESUMO

Wnt signaling controls a variety of developmental programs but the mechanisms by which the same signal leads to distinct outputs remain unclear. To address this question, we identified stage-specific modulators of Wingless (Wg) signaling in the Drosophila embryonic epidermis. We show that lines (lin) is essential for Wg-dependent patterning in dorsal epidermis. lin encodes a novel protein that acts cell-autonomously, downstream or in parallel to Armadillo (Arm) and upstream of Wg-dependent target genes. Lin can accumulate in nuclei of cells signaled by Wg, suggesting that signaling promotes entry of Lin into the nucleus, where it cooperates with Arm and Pangolin. Thus, a stage-specific modulator is used to mediate Wg signaling activity in dorsal patterning. Hedgehog (Hh) controls half of the parasegmental pattern dorsally and antagonizes Wg function to do so. Lin can accumulate in the cytoplasm of cells signaled by Hh, suggesting that Hh antagonizes Wg function by prohibiting Lin from entering the nucleus.

Documentos Relacionados

• Developmental regulation of the human embryonic beta-like globin gene is mediated by synergistic interactions among multiple tissue- and stage-specific elements.
• Tissue- and stage-specific activation of an endogenous provirus after transcription through its integration site in the opposite orientation.
• Stage-specific modulation of skeletal myogenesis by inhibitors of nuclear deacetylases
• Ovule development: identification of stage-specific and tissue-specific cDNAs.
• Highly conserved proximal promoter element harbouring paired Sox9-binding sites contributes to the tissue- and developmental stage-specific activity of the matrilin-1 gene