Selecting suitable reference genes for qPCR normalization: a comprehensive analysis in MCF-7 breast cancer cell line

Area of Science:

• Molecular Biology
• Cancer Research
• Cell Biology

Background:

• MCF-7 breast cancer cell line is a widely used research model.
• Previous studies identified reference genes for qPCR in MCF-7, but lacked comparative analysis.
• Expression dynamics of reference genes in sub-clones and under nutrient stress were underexplored.

Purpose of the Study:

• To investigate the expression stability of 12 reference genes in MCF-7 sub-clones.
• To evaluate the impact of nutrient stress on reference gene expression.
• To recommend reliable reference gene combinations for qPCR normalization in MCF-7 cells.

Main Methods:

• Cultured two MCF-7 sub-clones (A1 and A2) over multiple passages.
• Assessed expression of 12 candidate reference genes.
• Examined gene expression under nutrient stress conditions.
• Validated selected reference gene combinations using target genes (AURKA, KRT19).

Main Results:

• Differential reference gene expression was observed between MCF-7 sub-clones.
• GAPDH-CCSER2 (A1) and GAPDH-RNA28S (A2) were initially identified as least variable but unsuitable for validation.
• The triplet GAPDH-CCSER2-PCBP1 successfully normalized AURKA and KRT19 expression and handled nutrient stress variations.

Conclusions:

• MCF-7 sub-clone variance necessitates careful reference gene selection.
• The GAPDH-CCSER2-PCBP1 triplet is a robust alternative to traditional single internal controls.
• Avoid using ACTB, GAPDH, or PGK1 as single reference genes in MCF-7 studies.