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The JAK-STAT Signaling Pathway

The JAK-STAT Signaling Pathway

Several cytokine receptors have tightly bound Janus kinase or JAK proteins attached at their cytosolic tail. Small signaling molecules such as cytokines, growth hormones, or prolactins bind to the cytokine receptors and initiate their dimerization. The dimerization brings the cytosolic JAKs together that trans-phosphorylate and activates each other. The activated JAKs now phosphorylate cytosolic tails of the cytokine receptors, which serve as binding sites for adaptor proteins such as SH2...

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Related Experiment Video

Updated: May 1, 2026

Medium-scale Preparation of Drosophila Embryo Extracts for Proteomic Experiments

Medium-scale Preparation of Drosophila Embryo Extracts for Proteomic Experiments

Published on: May 30, 2017

Tools and methods for studying the Drosophila JAK/STAT pathway.

Qian Chen¹, Michelle Giedt¹, Lingfeng Tang¹

¹University of Kentucky, Biology Dept., 101 T.H. Morgan Bldg., 675 Rose St., Lexington, KY 40506, USA.

Methods (San Diego, Calif.)

|April 2, 2014

Summary

The Janus Kinase/Signal Transducers and Activators of Transcription (JAK/STAT) pathway is crucial for development and homeostasis. Drosophila melanogaster offers a simplified model to study this conserved signaling cascade using available genetic tools.

Keywords:

Cell signaling Cytokine Drosophila Genetics Janus kinase (JAK)STAT

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Last Updated: May 1, 2026

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Published on: December 29, 2009

Area of Science:

* Molecular Biology
* Genetics
* Developmental Biology

Background:

* The Janus Kinase/Signal Transducers and Activators of Transcription (JAK/STAT) pathway is a conserved signaling cascade vital for numerous cellular functions.
* While present in both insects and mammals, the JAK/STAT pathway exhibits greater complexity in mammals compared to the simpler homologous system in Drosophila.
* This complexity in mammals necessitates simpler models for comprehensive pathway investigation.

Purpose of the Study:

* To provide a foundational overview of the Drosophila JAK/STAT signaling pathway.
* To summarize the existing genetic, biochemical, and developmental tools for studying this pathway in Drosophila.
* To highlight Drosophila as a powerful model organism for understanding JAK/STAT signaling.

Main Methods:

* Review of existing scientific literature on the Drosophila JAK/STAT pathway.
* Compilation of information on genetic and biochemical reagents.
* Summary of developmental biology tools applicable to pathway research.

Main Results:

* Detailed description of the core components and mechanisms of the Drosophila JAK/STAT cascade.
* Comprehensive catalog of available reagents and tools for pathway manipulation and analysis.
* Emphasis on the utility of Drosophila's genetic tractability for JAK/STAT research.

Conclusions:

* Drosophila provides a simplified yet effective system for dissecting the fundamental mechanisms of JAK/STAT signaling.
* The availability of numerous tools in Drosophila facilitates in-depth investigation of this critical pathway.
* Findings from Drosophila research can offer insights into conserved aspects of JAK/STAT function in other organisms, including mammals.