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A Data Integration Workflow to Identify Drug Combinations Targeting Synthetic Lethal Interactions
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A Data Integration Workflow to Identify Drug Combinations Targeting Synthetic Lethal Interactions

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Integration of multiple biological contexts reveals principles of synthetic lethality that affect reproducibility

Angel A Ku1, Hsien-Ming Hu1, Xin Zhao1

  • 1Department of Bioengineering and Therapeutic Sciences, University of California, San Francisco, San Francisco, CA, 94158, USA.

Nature Communications
|May 14, 2020
PubMed

Insights

Synthetic lethality screens for KRAS-mutant cancers show pathway-level overlap, not gene-level. Understanding cellular and genetic context reveals reproducible DNA repair dependencies, like BRCA1, offering a new framework for drug discovery.

Area of Science:

  • Oncology
  • Genetics
  • Molecular Biology

Background:

  • Synthetic lethality screens aim to find cancer vulnerabilities but suffer from poor reproducibility.
  • KRAS mutations are common in many cancers, making synthetic lethality a promising therapeutic strategy.

Purpose of the Study:

  • To investigate the reasons for poor reproducibility in synthetic lethality screens for KRAS-mutant cancers.
  • To identify reproducible synthetic lethal targets by considering pathway and contextual factors.

Main Methods:

  • Analysis of published synthetic lethal screen data for KRAS.
  • Pathway analysis using protein-interaction networks.
  • Construction of a pairwise genetic interaction map.
  • Investigation of cellular and genetic context modulation of synthetic lethality.

Main Results:

  • Synthetic lethal hits for KRAS-mutant cancers overlap significantly at the pathway level, not the gene level.
  • Biological context, including cellular conditions and genetic interactions, strongly modulates synthetic lethal phenotypes.
  • A DNA repair dependency in KRAS-mutant cells, mediated by a BRCA1-containing network, was identified.

Conclusions:

  • Reproducible synthetic lethal targets can be identified by analyzing pathways and considering biological context.
  • A multi-faceted testing framework is needed to address the lack of reproducibility in synthetic lethality studies.
  • This approach nominates DNA repair pathways as key vulnerabilities in KRAS-mutant cancers.

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