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Review
. 2015 Feb:30:66-72.
doi: 10.1016/j.gde.2015.04.007. Epub 2015 Jun 4.

Sleeping Beauty transposon insertional mutagenesis based mouse models for cancer gene discovery

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Review

Sleeping Beauty transposon insertional mutagenesis based mouse models for cancer gene discovery

Branden S Moriarity et al. Curr Opin Genet Dev. 2015 Feb.

Abstract

Large-scale genomic efforts to study human cancer, such as the cancer gene atlas (TCGA), have identified numerous cancer drivers in a wide variety of tumor types. However, there are limitations to this approach, the mutations and expression or copy number changes that are identified are not always clearly functionally relevant, and only annotated genes and genetic elements are thoroughly queried. The use of complimentary, nonbiased, functional approaches to identify drivers of cancer development and progression is ideal to maximize the rate at which cancer discoveries are achieved. One such approach that has been successful is the use of the Sleeping Beauty (SB) transposon-based mutagenesis system in mice. This system uses a conditionally expressed transposase and mutagenic transposon allele to _target mutagenesis to somatic cells of a given tissue in mice to cause random mutations leading to tumor development. Analysis of tumors for transposon common insertion sites (CIS) identifies candidate cancer genes specific to that tumor type. While similar screens have been performed in mice with the PiggyBac (PB) transposon and viral approaches, we limit extensive discussion to SB. Here we discuss the basic structure of these screens, screens that have been performed, methods used to identify CIS.

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Figures

Figure 1
Figure 1
Basic structure of a SB cancer screen. Most screens to date utilize mice carrying the conditional SB11 Rosa26 “knockin” allele (Rosa26-LSL-SB11) and T2/Onc concatemer, which are crossed to mice carrying a tissue specific Cre transgene (TSP-Cre) and in many cases some cancer predisposing mutation (e.g. LSL-Trp53R270H). Important choices to be made at each step of such a screen are boxed.
Figure 2
Figure 2
Potential future refinements to SB cancer screens. Improvements and refinements to in vivo cancer screening using SB might be made at the level of the mouse, analysis of the primary tumor, or single cells isolated from the primary tumor.

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References

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