To globally evaluate to what extend the p53 mutant transcription activity can be restored by arsenic trioxide (ATO), p53-null U937 cells introduced with p53-R280I or wild-type p53 were treated with or without 1 μg/mL ATO. mRNA was isolated and then subject to deep sequencing, using Illumina HiSeq. The sequence reads that passed quality filters were analyzed using Cutadapt. Overall design: RNAseq to evaluate mutant p53 transcriptional activity upon ATO treatment.