ARID/BRIGHT DNA binding domain of dead ringer (Dri) from Drosophila melanogaster and similar proteins
Dri, also termed retained (retn), is a nuclear protein with a sequence-specific DNA-binding domain termed AT-rich DNA-interacting domain (ARID, also known as BRIGHT). It is a founding member of the ARID family. Sequence comparison shows that DRI belongs to the "extended" or e-ARID subfamily, which exhibits an extended region of similarity either side of the ARID. Dri plays an important role in embryogenesis. It functions as an essential transcription factor involved in aspects of dorsal/ventral and anterior/posterior axis patterning, as well as myogenesis and hindgut development.