Related Experiment Video
Updated: Mar 31, 2026
Molecular Analysis of Endothelial-mesenchymal Transition Induced by Transforming Growth Factor-β Signaling
Published on: August 3, 2018
Genome-Wide RNAi Screening to Dissect the TGF-β Signal Transduction Pathway
1Program in Molecular Medicine, University of Massachusetts Medical School, 373 Plantation Street, Worcester, MA, USA.
Abstract:
The transforming growth factor-β (TGF-β) family of cytokines figures prominently in regulation of embryonic development and adult tissue homeostasis from Drosophila to mammals. Genetic defects affecting TGF-β signaling underlie developmental disorders and diseases such as cancer in human. Therefore, delineating the molecular mechanism by which TGF-β regulates cell biology is critical for understanding normal biology and disease mechanisms. Forward genetic screens in model organisms and biochemical approaches in mammalian tissue culture were instrumental in initial characterization of the TGF-β signal transduction pathway. With complete sequence information of the genomes and the advent of RNA interference (RNAi) technology, genome-wide RNAi screening emerged as a powerful functional genomics approach to systematically delineate molecular components of signal transduction pathways. Here, we describe a protocol for image-based whole-genome RNAi screening aimed at identifying molecules required for TGF-β signaling into the nucleus. Using this protocol we examined >90 % of annotated Drosophila open reading frames (ORF) individually and successfully uncovered several novel factors serving critical roles in the TGF-β pathway. Thus cell-based high-throughput functional genomics can uncover new mechanistic insights on signaling pathways beyond what the classical genetics had revealed.
Insights
This study used genome-wide RNA interference screening in Drosophila to identify new molecules involved in transforming growth factor-beta (TGF-β) signaling. The findings reveal novel factors crucial for TGF-β pathway regulation and nuclear transport.
Area of Science:
- Molecular Biology
- Genomics
- Cell Signaling
Background:
- The transforming growth factor-beta (TGF-β) cytokine family is vital for embryonic development and tissue homeostasis in mammals.
- Dysregulation of TGF-β signaling is implicated in human developmental disorders and cancers.
- Understanding TGF-β's molecular mechanisms is crucial for both normal biology and disease research.
Purpose of the Study:
- To develop and implement an image-based, whole-genome RNA interference (RNAi) screen in Drosophila.
- To identify novel molecular components essential for TGF-β signaling into the nucleus.
- To leverage functional genomics for a systematic exploration of the TGF-β pathway.
Main Methods:
- Genome-wide RNA interference (RNAi) screening in Drosophila melanogaster.
- Image-based screening of >90% of annotated Drosophila open reading frames (ORFs).
- Functional genomics approach to systematically identify pathway components.
Main Results:
- Successfully identified several previously unknown factors critical for TGF-β pathway function.
- Demonstrated the utility of high-throughput functional genomics in uncovering novel signaling mechanisms.
- Characterized molecules involved in the nuclear translocation of TGF-β signaling components.
Conclusions:
- Cell-based, high-throughput functional genomics screens are powerful tools for dissecting complex signaling pathways.
- This approach extends beyond classical genetic methods to reveal new insights into TGF-β biology.
- The identified novel factors provide new avenues for research into TGF-β-related diseases.
More Related Videos
06:54Studying TGF-β Signaling and TGF-β-induced Epithelial-to-mesenchymal Transition in Breast Cancer and Normal Cells
Published on: October 27, 2020
11:06Live Cell Imaging of the TGF- β/Smad3 Signaling Pathway In Vitro and In Vivo Using an Adenovirus Reporter System
Published on: July 30, 2018
