Predicted to enable DNA-binding transcription factor activity, RNA polymerase II-specific and RNA polymerase II transcription regulatory region sequence-specific DNA binding activity. Acts upstream of or within regulation of T cell differentiation. Located in nucleus. Is expressed in several structures, including brain; early conceptus; and genitourinary system. Orthologous to several human genes including DUX4L1 (double homeobox 4 like 1 (pseudogene)); DUX4L2 (double homeobox 4 like 2 (pseudogene)); and DUX4L4 (double homeobox 4 like 4 (pseudogene)). [provided by Alliance of Genome Resources, Apr 2022]