Probably involved in transcriptional regulation. Binds to cruciform DNA (By similarity). In cells, binding to unmodified histone H3 regulates DOT1L functions including histone H3 'Lys-79' dimethylation (H3K79me2) and gene activation (By similarity). Self-associates. Interacts with FSTL3; the interaction enhances MLLT10 in vitro transcriptional activity and self-association. Interacts with YEATS4. Interacts with SS18. Interacts with DOT1L (By similarity). Interacts with histone H3; interaction is necessary for MLLT10 binding to nucleosomes; interaction is inhibited by histone H3 'Lys-27' methylations (H3K27me1, H3K27me2 and H3K27me3) amd acetylation; interaction stabilizes association of MLLT10 at chromatin; interaction is essential for histone H3 'Lys-79' dimethylation (H3K79me2) (By similarity).