Predicted to enable DNA-binding transcription repressor activity, RNA polymerase II-specific; identical protein binding activity; and sequence-specific double-stranded DNA binding activity. Involved in Notch signaling pathway and cellular response to glucocorticoid stimulus. Located in nucleus. Orthologous to human HEY1 (hes related family bHLH transcription factor with YRPW motif 1). [provided by Alliance of Genome Resources, Apr 2022]