Improved biplex quantitative real-time polymerase chain reaction with modified primers for gene expression analysis

Area of Science:

• Molecular Biology
• Genetics

Background:

• Standard PCR methods often face limitations with high-abundance housekeeping genes inhibiting rare target amplification.
• Optimizing primer concentrations is crucial for multiplex PCR to avoid cross-inhibition and ensure accurate quantification.

Purpose of the Study:

• To investigate the utility of stabilized modified bases in primers for reducing housekeeping gene primer concentration.
• To assess the impact of reduced primer concentration on amplification efficiency and coamplification of rare templates.
• To evaluate the application of this method in high-throughput gene expression studies.

Main Methods:

• Incorporation of stabilizing modified bases into primers.
• Real-time polymerase chain reaction (PCR) using MGB Eclipse hybridization probes.
• Coamplification of 18S ribosomal RNA (a high-abundance housekeeping gene) with various genes of interest.

Main Results:

• Stabilized modified primers allowed significantly reduced housekeeping gene primer concentrations without compromising amplification efficiency.
• Low primer concentrations enabled successful coamplification of abundant housekeeping genes with rare templates, preventing mutual inhibition.
• The method demonstrated potential for simplifying validation in high-throughput gene expression analysis.

Conclusions:

• Stabilized modified primers offer a robust solution for multiplex PCR, particularly in gene expression profiling.
• This approach enhances the reliability and efficiency of quantitative PCR experiments involving targets with large dynamic ranges.
• The findings suggest a valuable tool for streamlining validation processes in large-scale genetic studies.