Characterization and gene expression profiling of a stable cell line expressing a cell cycle GFP sensor

Area of Science:

• Cell biology
• Molecular biology
• Biotechnology

Background:

• Stable cell lines expressing fluorescent proteins, like enhanced green fluorescent protein (EGFP), are increasingly utilized in biological research.
• Understanding the potential impact of these engineered cell lines on cellular processes is crucial for reliable experimental outcomes.

Purpose of the Study:

• To comprehensively analyze the characteristics of a U2OS cell line engineered to stably express an EGFP cell cycle sensor.
• To compare the cell cycle duration, distribution, and global gene expression profiles of the EGFP-expressing cells against their parental U2OS counterparts.

Main Methods:

• Cell growth assays and flow cytometry were employed to assess cell cycle duration and phase distribution.
• Quantitative reverse transcription polymerase chain reaction (RT-PCR) was used to measure EGFP fusion protein mRNA levels.
• Microarray analysis was performed to compare global gene expression between parental and EGFP-expressing U2OS cells.

Main Results:

• The EGFP-expressing cell line exhibited identical doubling times and cell cycle distributions compared to parental U2OS cells.
• EGFP sensor expression levels were found to be equivalent to endogenous Cyclin B1.
• Microarray analysis revealed minimal differences (0.9%) in global gene expression, with no significant changes in cyclin expression.

Conclusions:

• Engineering stable cell lines with low-level EGFP cell cycle sensors has a minimal perturbing effect on cell cycle dynamics.
• The characterized EGFP-expressing U2OS cell line serves as a reliable tool for cell cycle studies with minimal impact on cellular gene expression.