Table 1.

FOXM1 isoforms and variants.

Isoform Name	Structure	Known Function	Size	RefSeq ID	Ensembl ID	UniProt ID	References
Well-Characterized FOXM1 Isoforms
FOXM1a	Includes alternative exons Va and VIIa	Not transcriptionally active	801 aa	NM_202002	ENST00000342628	Q08050-3	[13,14,28,29]
FOXM1b	Omits alternative exons Va and VIIa	Transcriptionally active	748 aa	NM_202003	ENST00000361953	Q08050-2	[13,14,28,29]
FOXM1c	Includes alternative exon Va; omits alternative exon VIIa	Transcriptionally active	763 aa	NM_021953	ENST00000359843	Q08050-1	[13,14,28,29]
Other Reported FOXM1 Isoforms
FOXM1b1	Omits alternative exons Va and VIIa; omits alanine residue at the beginning of exon III; includes glutamine residue at the end of exon V	Transcriptionally active with functions similar to FOXM1b	748 aa	NM_001243088	ENST00000627656	A0A0D9SFF0	[33]
FOXM1b2	Omits alternative exons Va and VIIa; omits alanine residue at the beginning of exon III	Transcriptionally active with functions similar to FOXM1b	747 aa	NM_001243089	N/A	N/A	[33]
FOXM1d	Includes alternative exon VIIa; omits alternative exon Va	Not transcriptionally active; binds directly to oncogenic proteins	786 aa	N/A	N/A	A0A2P9DTZ0-1	[31,34,35]
FOXM1 variant gAug10	No evidence at the protein level	N/A	N/A	N/A	ENST00000536066	N/A	[36]
FOXM1 variant lAug10	No evidence at the protein level	N/A	N/A	N/A	N/A	N/A	[36]