Homeobox protein SIX5 (SIX5)

Homeobox protein SIX5 (SIX5) is a member of the sine oculis (SIX) family of transcription factors, sharing a conserved N-terminal SIX domain (protein-protein interactions) and a homeodomain (DNA binding). It is essential in vertebrate development, notably for the retina, spermatogenesis, and the cardiac conduction system, but not directly required for skeletal muscle phenotype in myotonic dystrophy type 1. Reduced SIX5 function, often stemming from DMPK locus trinucleotide expansion in myotonic dystrophy, contributes to multisystem manifestations such as cataracts and conduction defects. The SIX5 gene is subject to epigenetic regulation, and altered expression and methylation status play pathogenic roles in DM1. No approved drugs directly target SIX5, and its principal functions are as a sequence-specific DNA binding protein modulating transcription during development and tissue homeostasis.

Other names

DMAHPDM locus-associated homeodomain proteinSine oculis homeobox homolog 5BOR2Dystrophia myotonica-associated homeodomain proteinHomeobox protein SIX5

Not applicable; no specific drugs or inhibitors targeting SIX5 are reported. Mechanism relates to transcriptional gene regulation via DNA binding and protein-protein interactions