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Updated: Apr 15, 2026
Forward Genetic Approach to Uncover Stress Resistance Genes in Mice — A High-throughput Screen in ES Cells
Published on: November 11, 2015
Functional genomics screening utilizing mutant mouse embryonic stem cells identifies novel radiation-response genes
Kimberly Loesch1, Stacy Galaviz1, Zaher Hamoui2
1Department of Biochemistry and Biophysics, Texas A&M University, College Station, Texas, United States of America.
Abstract:
Elucidating the genetic determinants of radiation response is crucial to optimizing and individualizing radiotherapy for cancer patients. In order to identify genes that are involved in enhanced sensitivity or resistance to radiation, a library of stable mutant murine embryonic stem cells (ESCs), each with a defined mutation, was screened for cell viability and gene expression in response to radiation exposure. We focused on a cancer-relevant subset of over 500 mutant ESC lines. We identified 13 genes; 7 genes that have been previously implicated in radiation response and 6 other genes that have never been implicated in radiation response. After screening, proteomic analysis showed enrichment for genes involved in cellular component disassembly (e.g. Dstn and Pex14) and regulation of growth (e.g. Adnp2, Epc1, and Ing4). Overall, the best targets with the highest potential for sensitizing cancer cells to radiation were Dstn and Map2k6, and the best targets for enhancing resistance to radiation were Iqgap and Vcan. Hence, we provide compelling evidence that screening mutant ESCs is a powerful approach to identify genes that alter radiation response. Ultimately, this knowledge can be used to define genetic variants or therapeutic targets that will enhance clinical therapy.
Insights
Identifying genes that affect radiation response is key for cancer therapy. Screening mutant stem cells revealed new genes, like Dstn and Map2k6, that could sensitize cancer cells to radiation.
Area of Science:
- Genetics
- Cancer Biology
- Radiation Oncology
Background:
- Optimizing radiotherapy requires understanding genetic factors influencing patient response.
- Individualizing cancer treatment necessitates identifying genes that confer radiation sensitivity or resistance.
Purpose of the Study:
- To identify novel genes involved in modulating cellular response to radiation.
- To screen a library of mutant murine embryonic stem cells (ESCs) for radiation response phenotypes.
Main Methods:
- Screening over 500 mutant ESC lines for cell viability and gene expression after radiation exposure.
- Utilizing proteomic analysis to identify enriched biological pathways.
- Focusing on a cancer-relevant subset of mutant ESCs.
Main Results:
- Identified 13 genes influencing radiation response, including 6 previously unknown.
- Proteomic analysis revealed enrichment for genes in cellular component disassembly and growth regulation.
- Dstn and Map2k6 were identified as potential sensitizing targets, while Iqgap and Vcan were identified as resistance targets.
Conclusions:
- Screening mutant ESCs is an effective strategy for discovering genes that impact radiation response.
- The identified genes offer potential therapeutic targets for enhancing radiotherapy efficacy.
- This research contributes to the development of personalized cancer treatment strategies.
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