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Related Concept Videos

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Receptor Tyrosine Kinases

Receptor tyrosine kinases or RTKs are membrane-bound receptors that phosphorylate specific tyrosine on protein substrates. RTKs regulate cellular growth, differentiation, survival, and migration. They contain an extracellular ligand binding domain, a transmembrane domain, and a cytosolic tail with intrinsic kinase activity. Several extracellular signaling molecules activate RTKs in one or more ways and relay the signal downstream. Ligands such as platelet-derived growth factor (PDGF) or...
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Mitogen-activated protein kinase, or MAPK pathway, activates three sequential kinases to regulate cellular responses such as proliferation, differentiation, survival, and apoptosis. The canonical MAPK pathway starts with a mitogen or growth factor binding to an RTK. The activated RTKs stimulate Ras, which recruits Raf or MAP3 Kinase (MAPKKK), the first kinase of the MAPK signaling cascade. Raf further phosphorylates and activates MEK or MAP2 Kinases (MAPKK), which in turn phosphorylates MAP...
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Related Experiment Video

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Light-mediated Reversible Modulation of the Mitogen-activated Protein Kinase Pathway during Cell Differentiation and Xenopus Embryonic Development
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Light-mediated Reversible Modulation of the Mitogen-activated Protein Kinase Pathway during Cell Differentiation and Xenopus Embryonic Development

Published on: June 15, 2017

RTK signaling modulates the Dorsal gradient.

Aharon Helman1, Bomyi Lim, María José Andreu

  • 1Department of Developmental Biology and Cancer Research, IMRIC, Faculty of Medicine, The Hebrew University, Jerusalem 91120, Israel.

Development (Cambridge, England)
|July 14, 2012
PubMed
Summary
This summary is machine-generated.

Receptor tyrosine kinases (RTK) signaling, through WntD, limits the nuclear levels and activity of the Dorsal (Dl) protein. This RTK-WntD interaction is crucial for patterning the Drosophila embryo's dorsoventral axis.

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Area of Science:

  • Developmental Biology
  • Molecular Biology
  • Genetics

Background:

  • The dorsoventral (DV) axis in Drosophila is established by a nuclear gradient of Dorsal (Dl), a transcription factor.
  • Dl regulates target genes regionally, controlling embryonic patterning.

Purpose of the Study:

  • To investigate the role of receptor tyrosine kinases (RTK) in modulating Dorsal (Dl) protein activity.
  • To elucidate the mechanism by which RTK signaling influences Dl distribution and function during Drosophila embryogenesis.

Main Methods:

  • Analysis of Dl nuclear localization and transcriptional activity under RTK signaling conditions.
  • Investigating the role of wntD as a mediator of RTK effects on Dl.
  • Studying the impact of RTK-dependent Dl regulation on target gene expression.

Main Results:

  • RTK signaling significantly reduces nuclear Dl levels and transcriptional activity.
  • WntD acts as a key antagonist, mediating RTK-induced reduction of Dl.
  • RTK pathways (Torso, EGFR) induce WntD expression, limiting Dl localization and activity.
  • This regulation is essential for precise target gene expression and DV axis patterning.

Conclusions:

  • RTK signaling, via WntD induction, provides a novel mechanism to control Dl morphogen activity in vivo.
  • This crosstalk between RTK and Dl pathways is vital for accurate spatial patterning of the Drosophila embryo.