Enables bHLH transcription factor binding activity; identical protein binding activity; and sequence-specific DNA binding activity. Acts upstream of or within negative regulation of transcription, DNA-templated and positive regulation of transcription by RNA polymerase II. Predicted to be located in nuclear body. Predicted to be part of protein-containing complex. Is expressed in several structures, including central nervous system; dorsal root ganglion; genitourinary system; hemolymphoid system; and retina. Used to study encephalomyelitis. Orthologous to human IKZF4 (IKAROS family zinc finger 4). [provided by Alliance of Genome Resources, Apr 2022]