In order to validate fusion transcript by Sanger sequencing, fusion candidate were selected. Fusion transcripts were observed only in cancer tissues, and protein coding transcripts were selected. Genes that were reported in cancer gene database (COSMIC, ChimerDB 2.0) and previous studied were validated.
For Sanger sequencing, 2 µg of total RNA was used for cDNA synthesis with an oligo-dT primer and PrimeScript reverse transcription polymerase chain reaction Kit (Takara, Kyoto, Japan) according to the manufacturer's protocol.
Fusion gene specific primer pairs and TAKARA Ex-Taq polymerase (Takara) were used for the PCR reaction. After purification, PCR products were sequenced with the BigDye Terminator v3.1 Sequencing Kit and a 3730xl automated sequencer (Applied Biosystems, Foster City, CA, USA). All DNA sequenced comparison alignments were performed using DNAstar SeqMan program (DNAstar, Madison, WI, USA).