IRF2BP1 breaked in the middle of exon 1 at the c.322 position and fused with RARA intron 2 which is located at 3717 bp upstream of its exon 3. The fusion produced a new intron by forming a paired splicing donor GT at 9 bp downstream of RARA breakpoint and acceptor AG at the 5' end of RARA exon 3. The IRF2BP1::RARA fusion gene leads a fusion transcript involving IRF2BP1 exon 1 and RARA exon 3, linked by a 9-bp fragment derived from RARA intron 2. The patient with IRF2BP1::RARA has same clinical features of APL.
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