Hygromycin B-selected cell lines from GAL4-regulated pUAST constructs.

Area of Science:

• * Molecular Biology
• * Cell Biology
• * Drosophila Genetics

Background:

• * Traditional transfection methods for Drosophila S2 cells are time-consuming and costly.
• * Establishing stable cell lines with consistent protein expression is challenging.
• * The UAS-GAL4 system offers inducible gene expression but requires stable integration for constitutive production.

Purpose of the Study:

• * To generate stable, selectable Drosophila S2 cell lines for constitutive coexpression of multiple proteins.
• * To establish a streamlined method for producing readily accessible protein pools.
• * To reduce the complexity and cost associated with protein-based studies in Drosophila S2 cells.

Main Methods:

• * Utilized the UAS-GAL4 system with the Actin5C-GAL4 driver for ubiquitous protein expression.
• * Cloned a hygromycin resistance gene into the pUAST vector for selection.
• * Cotransfected S2 cells with pUAST constructs and selected using hygromycin.
• * Maintained cell cultures in hygromycin-supplemented, serum-free media.

Main Results:

• * Successfully generated stable Drosophila S2 cell lines exhibiting coexpression of multiple proteins.
• * Demonstrated uniform expression of fluorescent markers (GFP and RFP) in cotransfected cells.
• * Confirmed concurrent expression of MYC3-tagged proteins via Western blot analysis.
• * Fluorescent-activated cell sorting (FACS) analysis indicated that 80% of the cell population expressed the GFP marker.

Conclusions:

• * The developed method enables the creation of stable, selectable S2 cell lines for constitutive protein production.
• * This technique provides a valuable tool for facilitating protein-based studies by offering readily accessible protein pools.
• * The approach significantly reduces the time and expense associated with transient transfections.