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CDK7-dependent transcriptional addiction in triple-negative breast cancer
Yubao Wang1, Tinghu Zhang1, Nicholas Kwiatkowski2
1Department of Cancer Biology, Dana-Farber Cancer Institute, Boston, MA 02115, USA; Department of Biological Chemistry and Molecular Pharmacology, Harvard Medical School, Boston, MA 02115, USA.
Abstract:
Triple-negative breast cancer (TNBC) is a highly aggressive form of breast cancer that exhibits extremely high levels of genetic complexity and yet a relatively uniform transcriptional program. We postulate that TNBC might be highly dependent on uninterrupted transcription of a key set of genes within this gene expression program and might therefore be exceptionally sensitive to inhibitors of transcription. Utilizing kinase inhibitors and CRISPR/Cas9-mediated gene editing, we show here that triple-negative but not hormone receptor-positive breast cancer cells are exceptionally dependent on CDK7, a transcriptional cyclin-dependent kinase. TNBC cells are unique in their dependence on this transcriptional CDK and suffer apoptotic cell death upon CDK7 inhibition. An "Achilles cluster" of TNBC-specific genes is especially sensitive to CDK7 inhibition and frequently associated with super-enhancers. We conclude that CDK7 mediates transcriptional addiction to a vital cluster of genes in TNBC and CDK7 inhibition may be a useful therapy for this challenging cancer.
Insights
Triple-negative breast cancer (TNBC) cells exhibit a unique dependency on CDK7, a key transcriptional regulator. Inhibiting CDK7 triggers cell death, offering a potential new therapy for this aggressive cancer.
Area of Science:
- Oncology
- Molecular Biology
- Genetics
Background:
- Triple-negative breast cancer (TNBC) is aggressive and genetically complex.
- TNBC displays a uniform transcriptional program, suggesting reliance on specific gene expression.
- Understanding TNBC vulnerabilities is crucial for developing targeted therapies.
Purpose of the Study:
- To investigate the potential dependency of TNBC on transcriptional processes.
- To identify specific molecular targets for TNBC treatment.
Main Methods:
- Utilized kinase inhibitors and CRISPR/Cas9 gene editing.
- Compared sensitivity of triple-negative versus hormone receptor-positive breast cancer cells.
- Analyzed gene expression changes and cell death upon target inhibition.
Main Results:
- Triple-negative breast cancer cells are uniquely dependent on CDK7, a transcriptional cyclin-dependent kinase.
- CDK7 inhibition leads to apoptotic cell death in TNBC cells.
- A specific gene cluster, sensitive to CDK7 inhibition, was identified in TNBC.
Conclusions:
- CDK7 addiction to a vital gene cluster in TNBC is mediated by CDK7.
- CDK7 inhibition represents a promising therapeutic strategy for triple-negative breast cancer.
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