Related Experiment Video
Updated: Feb 8, 2026
A Data Integration Workflow to Identify Drug Combinations Targeting Synthetic Lethal Interactions
Published on: May 27, 2021
Identification of highly penetrant Rb-related synthetic lethal interactions in triple negative breast cancer
Rachel Brough1,2, Aditi Gulati1,2, Syed Haider1
1The Breast Cancer Now Toby Robins Breast Cancer Research Centre, London, SW3 6JB, UK.
Abstract:
Although defects in the RB1 tumour suppressor are one of the more common driver alterations found in triple-negative breast cancer (TNBC), therapeutic approaches that exploit this have not been identified. By integrating molecular profiling data with data from multiple genetic perturbation screens, we identified candidate synthetic lethal (SL) interactions associated with RB1 defects in TNBC. We refined this analysis by identifying the highly penetrant effects, reasoning that these would be more robust in the face of molecular heterogeneity and would represent more promising therapeutic targets. A significant proportion of the highly penetrant RB1 SL effects involved proteins closely associated with RB1 function, suggesting that this might be a defining characteristic. These included nuclear pore complex components associated with the MAD2 spindle checkpoint protein, the kinase and bromodomain containing transcription factor TAF1, and multiple components of the SCFSKP Cullin F box containing complex. Small-molecule inhibition of SCFSKP elicited an increase in p27Kip levels, providing a mechanistic rationale for RB1 SL. Transcript expression of SKP2, a SCFSKP component, was elevated in RB1-defective TNBCs, suggesting that in these tumours, SKP2 activity might buffer the effects of RB1 dysfunction.
Insights
Researchers identified synthetic lethal interactions for RB1-defective triple-negative breast cancer (TNBC). Targeting the SCFSKP complex offers a potential therapeutic strategy for TNBC by increasing p27Kip levels.
Area of Science:
- Oncology
- Molecular Biology
- Genetics
Background:
- RB1 tumor suppressor gene defects are common in triple-negative breast cancer (TNBC).
- Effective therapeutic strategies targeting RB1 defects in TNBC remain elusive.
- Understanding synthetic lethal interactions is crucial for developing targeted therapies.
Purpose of the Study:
- To identify synthetic lethal (SL) interactions associated with RB1 defects in TNBC.
- To refine SL interactions by focusing on highly penetrant effects for therapeutic potential.
- To elucidate the molecular mechanisms underlying RB1-associated synthetic lethality.
Main Methods:
- Integration of molecular profiling data with genetic perturbation screens.
- Analysis of highly penetrant synthetic lethal effects.
- Small-molecule inhibition of the SCFSKP complex.
- Assessment of p27Kip levels and SKP2 transcript expression.
Main Results:
- Identified candidate SL interactions for RB1-defective TNBC, including those involving the nuclear pore complex, MAD2, TAF1, and SCFSKP complex components.
- Highly penetrant SL effects were often associated with proteins functionally linked to RB1.
- Small-molecule inhibition of SCFSKP increased p27Kip levels, providing a mechanistic link.
- Elevated SKP2 expression in RB1-defective TNBC suggests a buffering role.
Conclusions:
- Synthetic lethality offers a promising avenue for targeting RB1-defective TNBC.
- The SCFSKP complex and its regulation of p27Kip represent a potential therapeutic target.
- Understanding the interplay between RB1, SKP2, and p27Kip is key for future TNBC treatment strategies.
Related Concept Videos
01:23Negative Regulator Molecules
02:41Lethal Alleles
Lucien Cuénot discovered lethal alleles in 1905 while studying the inheritance of coat color in mice. The agouti gene is responsible for the color of the coat in mice. This gene codes for an agouti-signaling protein, which is responsible for melanin distribution in mammals. The wild-type allele gives rise to gray-brown coat color in mice, while the mutant allele gives rise to yellow coat color. In addition to coat color, the agouti gene is associated with the yellow...
02:55Synthetic Biology
Golden rice
Golden rice is a genetically modified...
01:06Scalar and Vector Triple Products
The scalar triple product is the dot product of a vector with the cross product of two vectors....
00:58Positive, Negative, and Zero Work
01:28Synthetic Disvision of Polynomials