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Haploid genetic screens identify genetic vulnerabilities to microtubule-targeting agents.

Abstract：

:The absence of biomarkers to accurately predict anticancer therapy response remains a major obstacle in clinical oncology. We applied a genome-wide loss-of-function screening approach in human haploid cells to characterize genetic vulnerabilities to classical microtubule-targeting agents. Using docetaxel and vinorelbine, two well-established chemotherapeutic agents, we sought to identify genetic alterations sensitizing human HAP1 cells to these drugs. Despite the fact that both drugs act on microtubules, a set of distinct genes were identified whose disruption affects drug sensitivity. For docetaxel, this included a number of genes with a function in mitosis, while for vinorelbine we identified inactivation of FBXW7, RB1, and NF2, three frequently mutated tumor suppressor genes, as sensitizing factors. We validated these genes using independent knockout clones and confirmed FBXW7 as an important regulator of the mitotic spindle assembly. Upon FBXW7 depletion, vinorelbine treatment led to decreased survival of cells due to defective mitotic progression and subsequent mitotic catastrophe. We show that haploid insertional mutagenesis screens are a useful tool to study genetic vulnerabilities to classical chemotherapeutic drugs by identifying thus far unknown sensitivity factors. These results provide a rationale for investigating patient response to vinca alkaloid-based anticancer treatment in relation to the mutational status of these three tumor suppressor genes, and could in the future lead to the establishment of novel predictive biomarkers or suggest new drug combinations based on molecular mechanisms of drug sensitivity.

journal_name

Mol Oncol

journal_title

Molecular oncology

authors

Gerhards NM,Blomen VA,Mutlu M,Nieuwenhuis J,Howald D,Guyader C,Jonkers J,Brummelkamp TR,Rottenberg S

doi

10.1002/1878-0261.12307

subject

Has Abstract

pub_date

2018-06-01 00:00:00

pages

953-971

issue

6

eissn

1574-7891

issn

1878-0261

journal_volume

12

pub_type

杂志文章

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