A gene trap vector system for identifying transcriptionally responsive genes

Area of Science:

• Molecular Biology
• Genetics
• Biotechnology

Background:

• Identifying genes regulated by external stimuli is crucial for understanding cellular responses.
• Existing methods for gene discovery can be time-consuming and lack efficiency.

Purpose of the Study:

• To develop a fast and efficient method for trapping genes regulated by exogenous stimuli.
• To enable the identification and isolation of specific responsive gene populations.

Main Methods:

• Construction of a promoterless retroviral vector encoding a green fluorescent protein-nitroreductase (GFNR) fusion protein.
• Utilizing flow cytometry for cell sorting based on GFNR expression.
• Employing positive and negative pharmacological selection strategies using nitroreductase (NTR).
• Application in liver cells stimulated with hepatocyte growth factor (HGF).

Main Results:

• Successful isolation of cell populations with gene traps in induced or suppressed genes.
• Identification of several distinct responsive clones with confirmed regulated gene expression at the RNA level.
• Demonstration that selection can be calibrated for varying basal expression and regulation levels.

Conclusions:

• The GFNR-based gene trap screening procedure is flexible and efficient.
• This method is suitable for large-scale surveys of transcriptionally regulated genes.
• The technique facilitates the discovery of genes responsive to external signals.