PiggyBac Transposon-Based Insertional Mutagenesis in Mice

Area of Science:

• Genetics
• Cancer Biology
• Molecular Biology

Background:

• Identifying cancer driver genes from large-scale genetic alteration data is difficult.
• Transposon-based insertional mutagenesis in mice is an effective strategy for flagging biologically relevant genes.
• Existing sequencing methods for transposon insertion sites have limitations.

Purpose of the Study:

• To develop and validate a robust method for identifying cancer driver genes using insertional mutagenesis.
• To enable high-throughput screening for candidate cancer genes.
• To study the clonal architecture of genetic tumor evolution.

Main Methods:

• Generation of transgenic mouse lines with PiggyBac-based oncogenic transposons.
• Whole-body and tissue-specific insertional mutagenesis screens using PiggyBac transposase.
• Development and application of QiSeq for (semi-)quantitative transposon insertion site sequencing.
• Multiplexed high-throughput sequencing formats.

Main Results:

• Successful generation of mouse models for insertional mutagenesis screens.
• QiSeq overcomes previous library preparation biases, enabling accurate quantification of insertion sites.
• Demonstrated utility of QiSeq in multiplexed formats for candidate cancer gene discovery.
• Provided insights into the clonal distribution of transposon insertions in tumors.

Conclusions:

• PiggyBac-based insertional mutagenesis coupled with QiSeq is a powerful approach for cancer gene discovery.
• This methodology facilitates the identification of cancer drivers and aids in understanding tumor evolution.
• QiSeq offers a high-throughput, quantitative, and less biased method for analyzing transposon insertions.