Mix paired-like homeobox protein 1 (MIXL1)

Mix paired-like homeobox protein 1 (MIXL1) is a paired-type homeobox transcription factor found in humans and is part of the Mix/Bix homeobox gene family[1][2]. It is expressed transiently in the primitive streak during early embryogenesis, marking precursors that will become mesoderm and endoderm[1][2][4]. MIXL1 regulates essential developmental processes by activating genes required for mesoderm formation, hematopoiesis, and definitive endoderm development[1][3][4][5]. It functions as a dimeric, sequence-specific transcriptional activator, often responding to external signals such as BMP4, Nodal, and other TGF-β family ligands to guide cell fate during gastrulation[2][3][4]. Loss of MIXL1 disrupts embryonic axis formation, cardiac and gut development, and blood cell differentiation[1][3][4]. MIXL1 has been detected in leukemic cell lines and implicated in some cancers when aberrantly expressed[1]. There are currently no known therapeutic drugs that specifically target MIXL1, and its main utility as a biomarker is limited to research applications in developmental biology and stem cell lineage tracing[2][4][5].

Other names

MixMix1Mild1Homeobox protein MIXL1Homeodomain protein MIXMix.1 homeobox-like proteinMILD1MIXMix-like homeobox protein 1