Enables DNA-binding transcription factor activity, RNA polymerase II-specific and RNA polymerase II transcription regulatory region sequence-specific DNA binding activity. Involved in several processes, including cell fate commitment; embryonic pattern specification; and positive regulation of DNA-templated transcription. Located in condensed nuclear chromosome. Expressed in several structures, including ABprpppppaa; enteric muscle; epithelial cell; oocyte; and tail spike. Human ortholog(s) of this gene implicated in Barrett's esophagus. Is an ortholog of human CDX1 (caudal type homeobox 1) and CDX2 (caudal type homeobox 2).