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PLoS One. 2016 Feb 16;11(2):e0149099. doi: 10.1371/journal.pone.0149099. eCollection 2016.

CDK1 Is a Synthetic Lethal Target for KRAS Mutant Tumours.

Author information

1
The CRUK Gene Function Laboratory, The Institute of Cancer Research, London, SW3 6JB, United Kingdom.
2
Breakthrough Breast Cancer Research Centre, The Institute of Cancer Research, London, SW3 6JB, United Kingdom.
3
IFOM-FIRC Institute of Molecular Oncology, Via Adamello 16, 20139, Milan, Italy.
4
Horizon Discovery, 7100 Cambridge Research Park, Waterbeach, Cambridge, CB25 9TL, United Kingdom.

Abstract

Activating KRAS mutations are found in approximately 20% of human cancers but no RAS-directed therapies are currently available. Here we describe a novel, robust, KRAS synthetic lethal interaction with the cyclin dependent kinase, CDK1. This was discovered using parallel siRNA screens in KRAS mutant and wild type colorectal isogenic tumour cells and subsequently validated in a genetically diverse panel of 26 colorectal and pancreatic tumour cell models. This established that the KRAS/CDK1 synthetic lethality applies in tumour cells with either amino acid position 12 (p.G12V, pG12D, p.G12S) or amino acid position 13 (p.G13D) KRAS mutations and can also be replicated in vivo in a xenograft model using a small molecule CDK1 inhibitor. Mechanistically, CDK1 inhibition caused a reduction in the S-phase fraction of KRAS mutant cells, an effect also characterised by modulation of Rb, a master control of the G1/S checkpoint. Taken together, these observations suggest that the KRAS/CDK1 interaction is a robust synthetic lethal effect worthy of further investigation.

PMID:
26881434
PMCID:
PMC4755568
DOI:
10.1371/journal.pone.0149099
[Indexed for MEDLINE]
Free PMC Article

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