Enables DNA-binding transcription factor activity and chromatin binding activity. Acts upstream of or within BMP signaling pathway; mesoderm formation; and regulation of transcription by RNA polymerase II. Located in mitochondrion. Part of transcription regulator complex. Is expressed in several structures, including egg cylinder; embryo mesoderm; and genitourinary system. Orthologous to human ECSIT (ECSIT signaling integrator). [provided by Alliance of Genome Resources, Apr 2022]