No Product Due to Suboptimal Cycling Parameters (PCR / RT-PCR Amplification Problems)

Question

Accepted Answer

No amplification product visible despite proper template and reagents, suggesting thermal cycling conditions are inappropriate. Common causes: 1) Primer annealing temperature too high, preventing primer binding 2) Denaturing temperature suboptimal, especially for GC-rich templates 3) Extension time too short for target amplicon length 4) Reagents not properly thawed and mixed before use Solutions: 1) Decrease annealing temperature in 2°C increments 2) Increase temperature or duration of initial denaturation step for GC-rich templates 3) Increase extension times, especially important for long PCR products 4) Thaw and thoroughly mix all reagents before setting up reactions