Acts as a transcriptional repressor. Positively regulates neuronal differentiation. Represses transcription by binding to the E box-containing promoter (By similarity). Binds to delta 1-crystallin enhancer core and represses lens-specific transcription. It binds as well many other non-lens specific DNA sequences. May interact with CTBP1. Expression is developmentally regulated with high expression in mesoderm, nervous system and lens. Expression starts after gastrulation, when organogenesis has just begun. Belongs to the delta-EF1/ZFH-1 C2H2-type zinc-finger family.