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Updated: Aug 5, 2025

Single-Molecule Fluorescence Visualization of DNA Polymerase Dynamics at G-Quadruplexes
Published on: April 4, 2025
G-Quadruplexes in c-MYC Promoter as Targets for Cancer Therapy
Bárbara Bahls1, Israa M Aljnadi1, Rita Emídio1
1Faculty of Pharmacy, Research Institute for Medicines (iMed.Ulisboa), Universidade de Lisboa, 1649-003 Lisbon, Portugal.
Abstract:
Cancer is a societal burden demanding innovative approaches. A major problem with the conventional chemotherapeutic agents is their strong toxicity and other side effects due to their poor selectivity. Uncontrolled proliferation of cancer cells is due to mutations, deletions, or amplifications in genes (oncogenes) encoding for proteins that regulate cell growth and division, such as transcription factors, for example, c-MYC. The direct targeting of the c-MYC protein has been attempted but so far unsuccessfully, as it lacks a definite binding site for the modulators. Meanwhile, another approach has been explored since the discovery that G-quadruplex secondary DNA structures formed in the guanine-rich sequences of the c-MYC promoter region can downregulate the transcription of this oncogene. Here, we will overview the major achievements made in the last decades towards the discovery of a new class of anticancer drugs targeting G-quadruplexes in the c-MYC promoter of cancer cells.
Insights
Researchers are developing novel anticancer drugs targeting G-quadruplexes in the c-MYC gene promoter. This approach aims to overcome the limitations of conventional chemotherapy by selectively downregulating cancer cell proliferation.
Area of Science:
- Oncology
- Molecular Biology
- Drug Discovery
Background:
- Cancer poses a significant societal challenge, with conventional chemotherapies often exhibiting poor selectivity and severe side effects.
- The c-MYC oncogene, crucial for cell growth and division, is frequently dysregulated in cancer.
- Directly targeting the c-MYC protein has proven difficult due to its lack of a defined binding site.
Purpose of the Study:
- To review advancements in targeting G-quadruplex structures within the c-MYC promoter as a novel anticancer strategy.
- To highlight the potential of G-quadruplex-targeting agents for improved cancer treatment.
Main Methods:
- Overview of research on G-quadruplex secondary DNA structures.
- Analysis of strategies for modulating G-quadruplex formation in the c-MYC promoter region.
- Review of drug discovery efforts targeting these structures.
Main Results:
- G-quadruplexes in the c-MYC promoter can serve as a target to downregulate oncogene transcription.
- Significant progress has been made in identifying and developing small molecules that interact with these structures.
- This approach offers a promising alternative to conventional cancer therapies.
Conclusions:
- Targeting c-MYC G-quadruplexes represents a viable and innovative strategy for anticancer drug development.
- Further research in this area holds potential for creating more selective and effective cancer treatments.
- The development of G-quadruplex-binding agents could overcome limitations associated with traditional chemotherapeutics.
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