RT-qPCR Gene Expression Quantification and Workflow Solutions

A complete experimental framework covering sample preservation, RNA extraction, genomic DNA removal, quality assessment, reverse transcription, real-time quantitative PCR, and data analysis.

Experimental Objective

To quantify the relative or absolute abundance of target RNA in samples such as cells and tissues, for gene expression analysis, treatment response studies, and biomarker validation.

Scope of Application

  • Samples: Cultured cells, fresh or frozen tissues, blood, FFPE, bodily fluids, or purified RNA
  • Species: Depends on primer and probe design
  • Difficulty and Time: Moderate, typically about 4–8 hours

Standard Workflow

  1. Determine samples, target genes, and quantification strategy
  2. Extract total RNA and remove genomic DNA
  3. Assess RNA concentration, purity, and integrity
  4. Normalize RNA input and perform reverse transcription
  5. Prepare qPCR reaction mixture and include all controls
  6. Check amplification curves, melting curves, and amplification efficiency
  7. Complete normalization, statistical analysis, and results reporting

Required Materials

Equipment

  • Real-time fluorescence quantitative PCR instrument
  • Nucleic acid quantification instrument, microcentrifuge, and pipettes
  • PCR workstation for segregated use

Reagents

  • RNA extraction, DNase, and reverse transcription reagents
  • qPCR master mix, primers, or probes
  • Nuclease-free water and necessary standards

Consumables

  • RNase-free centrifuge tubes and pipette tips
  • Optical qPCR tubes, plates, and sealing film

Required Controls and QC

  • No-template control (NTC), no-reverse transcription control (-RT), positive control, and stable internal reference
  • Technical replicates show consistent Ct values, and dye-based melting curves show a single main peak
  • Amplification efficiency and standard curve linearity meet laboratory preset ranges

Common Problems

If there is no amplification, check RNA/cDNA quality, primers, and reaction components; if replicate variability is high, improve pipetting, mixing, and bubble control; if NTC is positive, replace reagents and perform segregated cleaning.

Shop by Material Role

Note: Specific product Bill of Materials (BOM) will be added after actual product stocking and completion of amplification efficiency, instrument compatibility, and specification review.