Cofactor for the transcription factor TCF7 (PubMed:26079538). Involved in regulation of lymphoid development by driving multipotent hematopoietic progenitor cells towards a T cell fate (PubMed:21715312). Interacts with HSPA8 and LAMP2 isoform A; the interaction may target MLLT11 for degradation via chaperone-mediated autophagy (PubMed:24880125). Interacts with TCF7 (PubMed:26079538). Continuous nuclear export is followed by degradation. Expressed in myoepithelial cells of normal breast tissue (at protein level) (PubMed:26079538). Highly expressed in thymus (PubMed:7833468). Expressed in colon, small intestine, prostate and ovary. Not detected in peripheral blood lymphocytes and spleen (PubMed:7833468). Ubiquitinated, leading to degradation. A chromosomal aberration involving MLLT11 is found in acute leukemias. Translocation t(1;11)(q21;q23) with KMT2A/MLL1. Belongs to the MLLT11 family.