A quantitative model of developmental RTK signaling
Yogesh Goyal1, Trudi Schüpbach2, Stanislav Y Shvartsman3
1Department of Chemical and Biological Engineering, Princeton University, Princeton, NJ 08544, United States; The Lewis-Sigler Institute for Integrative Genomics, Princeton University, Princeton, NJ 08544, United States.
Abstract:
Receptor tyrosine kinases (RTKs) control a wide range of developmental processes, from the first stages of embryogenesis to postnatal growth and neurocognitive development in the adult. A significant share of our knowledge about RTKs comes from genetic screens in model organisms, which provided numerous examples demonstrating how specific cell fates and morphologies are abolished when RTK activation is either abrogated or significantly reduced. Aberrant activation of such pathways has also been recognized in many forms of cancer. More recently, studies of human developmental syndromes established that excessive activation of RTKs and their downstream signaling effectors, most notably the Ras signaling pathway, can also lead to structural and functional defects. Given that both insufficient and excessive pathway activation can lead to abnormalities, mechanistic analysis of developmental RTK signaling must address quantitative questions about its regulation and function. Patterning events controlled by the RTK Torso in the early Drosophila embryo are well-suited for this purpose. This mini review summarizes current state of knowledge about Torso-dependent Ras activation and discusses its potential to serve as a quantitative model for studying the general principles of Ras signaling in development and disease.
Insights
Receptor tyrosine kinases (RTKs) regulate development and are implicated in cancer. Understanding quantitative aspects of RTK signaling, like Ras pathway activation, is crucial for development and disease research.
Area of Science:
- Developmental Biology
- Cell Signaling
- Molecular Biology
Background:
- Receptor tyrosine kinases (RTKs) are critical for development, from embryogenesis to adult neurocognition.
- Genetic screens in model organisms have revealed RTK roles in cell fate and morphology.
- Aberrant RTK activation is linked to cancer and human developmental syndromes.
Purpose of the Study:
- To review the current understanding of Torso-dependent Ras activation in Drosophila.
- To explore the potential of Torso signaling as a quantitative model for Ras pathway research.
- To address quantitative questions regarding RTK signaling regulation and function in development and disease.
Main Methods:
- Review of existing literature on RTK signaling, Ras pathway, and Torso in Drosophila.
- Analysis of genetic and molecular mechanisms governing RTK activation and downstream signaling.
- Discussion of quantitative principles derived from developmental patterning events.
Main Results:
- RTK signaling, including Ras pathway activation, must be quantitatively regulated for normal development.
- Both insufficient and excessive RTK activation lead to developmental defects.
- Torso signaling in early Drosophila embryos provides a suitable system for quantitative analysis.
Conclusions:
- Quantitative analysis of RTK signaling is essential for understanding development and disease.
- The Torso pathway in Drosophila offers a powerful model for studying Ras signaling principles.
- Further research into quantitative RTK signaling can advance developmental biology and cancer research.
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