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Updated: Jul 13, 2026
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Transgenic Rodent Assay for Quantifying Male Germ Cell Mutant Frequency
Published on: August 6, 2014
Modeling insertional mutagenesis using gene length and expression in murine embryonic stem cells.
Alex S Nord1, Karen Vranizan, Whittemore Tingley
1Department of Medicine, MacDonald Medical Research Laboratories, University of California at Los Angeles, California, USA. nordalex@u.washington.edu
Plos One
|July 20, 2007
Summary
Gene trapping efficiency in mammalian cells depends on gene length and expression levels. Statistical models reveal which genes are susceptible or resistant to trapping, aiding large-scale mutagenesis efforts.
Area of Science:
- Genomics
- Mammalian Genetics
- Molecular Biology
Background:
- High-throughput mutagenesis is crucial for analyzing mammalian gene function.
- Gene trapping in embryonic stem cells (ESCs) is a primary method for insertional mutagenesis.
- Genome-wide rules governing gene-trapping efficiency and vector design effects remain unclear.
Purpose of the Study:
- To model gene-trap likelihood using public data.
- To identify factors influencing gene susceptibility and resistance to gene-trapping.
- To quantitatively characterize gene-trap activity hotspots.
Main Methods:
- Developed spline-based regression models using public gene-trap data.
- Analyzed associations between gene length, gene expression, and gene-trap likelihood.
- Evaluated three classes of gene-trap vectors.
Main Results:
- Gene length and expression are significant determinants of trap likelihood across all tested vectors.
- Identified "hotspots" of gene-trap activity beyond length and expression.
- Models explained a high proportion of variance for expression-dependent vectors and a significant portion for independent vectors.
Conclusions:
- Significant effects of gene expression and length on vector insertion are confirmed.
- Findings enhance understanding of gene-trapping determinants.
- Results can guide planning of large-scale mutagenesis initiatives.
