Related Experiment Video

Updated: Jan 12, 2026

Spatial and Temporal Control of Murine Melanoma Initiation from Mutant Melanocyte Stem Cells
06:09

Spatial and Temporal Control of Murine Melanoma Initiation from Mutant Melanocyte Stem Cells

Published on: June 7, 2019

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CDK12 inhibition reveals melanoma dependence on the RUNX1/CBFβ complex for genomic stability

Jonathan Boucher1, Thibault Houles1, Elsa Berliocchi1

  • 1Institute for Research in Immunology and Cancer (IRIC), Université de Montréal, Montreal, QC, Canada.

Cell Reports
|November 2, 2025
PubMed

Insights

Targeting cyclin-dependent kinase 12 (CDK12) in melanoma shows promise. Combining CDK12 inhibitors with RUNX1 inhibition exploits a synthetic lethal vulnerability, suppressing tumor growth.

Area of Science:

  • Oncology
  • Molecular Biology
  • Genetics

Background:

  • Cutaneous melanoma, a deadly skin cancer, often involves RAS/mitogen-activated protein kinase (MAPK) pathway hyperactivation.
  • Cyclin-dependent kinase 12 (CDK12) is crucial for transcriptional regulation and DNA repair, making it a therapeutic target in MAPK-driven melanoma.

Purpose of the Study:

  • To identify vulnerabilities in CDK12-inhibited melanoma.
  • To explore combinatorial therapeutic strategies targeting CDK12 and its synthetic lethal partners.

Main Methods:

  • Genome-wide CRISPR-Cas9 screening was employed to identify genes synthetically lethal with CDK12.
  • Melanoma cell sensitivity to CDK12 inhibitors was assessed following RUNX1 inhibition.
  • Tumor growth was evaluated in vivo using combined CDK12 and RUNX1 inhibition.

Main Results:

  • The Runt-related transcription factor RUNX1 and its cofactor CBFβ were identified as synthetic lethal partners of CDK12.
  • RUNX1 inhibition increased melanoma sensitivity to CDK12 inhibitors, leading to DNA damage and impaired repair, independent of p53.
  • Combined inhibition of CDK12 and RUNX1 significantly suppressed melanoma growth in vivo.

Conclusions:

  • RUNX1/CBFβ acts as a compensatory mechanism in melanoma treated with CDK12 inhibitors.
  • A synthetic lethal interaction between CDK12 and RUNX1/CBFβ offers a promising avenue for combinatorial melanoma therapy.
Keywords:
CBFBCDK12CP: cancerCRISP-Cas9 screeningDNA damage responseRUNX1genomic stabilitymelanomap53-independent pathwaytherapeutic vulnerabilitytranscriptional regulation

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