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Functional screening reveals genetic dependencies and diverging cell cycle control in atypical teratoid rhabdoid

Daniel J Merk1,2, Foteini Tsiami1,2, Sophie Hirsch1,2,3

  • 1Department of Neurology and Interdisciplinary Neuro-Oncology, Hertie Institute for Clinical Brain Research, University Hospital Tübingen, Eberhard Karls University Tübingen, Tübingen, 72076, Germany.

Genome Biology
|December 1, 2024
PubMed
Abstract

Insights

Atypical teratoid rhabdoid tumors (ATRTs) lack actionable mutations. This study identifies CDK4/6 inhibitors as potent drugs against ATRTs by targeting cell cycle regulators like AMBRA1.

Area of Science:

  • Oncology
  • Genetics
  • Molecular Biology

Background:

  • Atypical teratoid rhabdoid tumors (ATRTs) are aggressive pediatric brain cancers with poor prognoses.
  • Current treatments are insufficient, and identifying new therapeutic targets is crucial due to a lack of actionable genetic alterations.

Purpose of the Study:

  • To identify genetic dependencies and potential therapeutic targets in ATRTs using a functional genomics approach.
  • To validate drug candidates and understand their mechanisms of action in ATRT cells.

Main Methods:

  • Functional genomics screens to identify ATRT vulnerabilities.
  • Validation of hits using a small molecule drug library.
  • Chemogenetic interactor screens to map cell cycle regulation.

Main Results:

  • CDK4/6 inhibitors demonstrated potent anti-tumor activity in ATRT cells, independent of specific genetic subgroups.
  • Cell cycle regulators were identified as key dependencies, influencing response to CDK4/6 inhibition.
  • AMBRA1 was found to regulate mitosis and act as a context-specific inhibitor of cell cycle progression.

Conclusions:

  • The study provides a valuable resource of genetic and chemical dependencies for developing targeted ATRT therapies.
  • A novel mechanism of cell cycle inhibition involving AMBRA1 was uncovered, highlighting its tumor-suppressive role.
Keywords:
AMBRA1CDK4/6 inhibitorsCRISPR-Cas9Functional screeningGenetic dependenciesRhabdoid tumorsTumor suppressor

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