ARID3A and ARID3B bind to ARID3-binding sites in the p53 target genes.
ARID3B silencing blocked expression of pro-apoptotic p53-target genes.
ARID3B overexpression activated transcription of pro-apoptotic p53-target genes.
Ectopic ARID3B but not ARID3A expression induced apoptosis.
ARID3B but not ARID3A silencing blocked apoptosis following DNA damage.