Validation-Based Insertional Mutagenesis (VBIM), A Powerful Forward Genetic Screening Strategy

Area of Science:

• Genetics
• Molecular Biology
• Genomics

Background:

• Forward genetics identifies genes influencing phenotypes by analyzing genetic changes.
• Traditional methods include cDNA, shRNA, CRISPR, and chemical mutagens, each with limitations.
• Validation-Based Insertional Mutagenesis (VBIM) offers a novel approach using lentiviruses.

Purpose of the Study:

• To review the VBIM strategy for genetic screens.
• To highlight its application in identifying novel genes and functions.
• To discuss its potential for in vivo applications.

Main Methods:

• VBIM utilizes modified lentiviruses as insertional mutagens with strong promoters.
• It generates large cell libraries with VBIM promoter insertions for phenotype-driven selection.
• VBIM enables identification of gain- and loss-of-function mutations and targets any genomic locus.

Main Results:

• VBIM facilitates selection of cells overexpressing VBIM-driven RNAs or proteins that promote a phenotype.
• VBIM-driven RNAs can encode full-length, truncated, or antisense RNAs, impacting gene expression.
• The strategy allows for true whole-genome screens without complex library construction.

Conclusions:

• VBIM is a versatile and efficient strategy for forward genetic screens.
• It has been successfully applied to identify novel genes and functions in diverse screens.
• VBIM shows promise for transitioning to in vivo genetic screens.