Low Throughput Direct Cycle Sequencing of Polymerase Chain Reaction (PCR) Products

Polymerase Chain Reaction (PCR) products have been traditionally characterized by cloning and cycle sequencing. However, when quick sequencing data are required, the cloning step may be omitted and PCR products can be sequenced directly. We describe here a sequencing protocol that involves the gold standard Big Dye chemistry in a low throughput format using one of the latest sequencing platforms the ABI Seqstudio. Our cycle sequencing protocol follows the following steps: (1) purification of the PCR product with a spin column-based kit; (2) quality & quantity assessment of the PCR product with the use of spectrophotometry & gel electrophoresis; (3) setup and amplification of the cycle sequencing reaction; (4) Capillary Electrophoresis; (5) Sequence Data Analysis.