May act as a transcriptional corepressor. Has a possible role in the negative regulation of proteins containing WD-40 repeats. May be required for the initiation and maintenance of the differentiated state (By similarity). Monomer. Predominantly expressed in brain, testis and ovary. Ubiquitously expressed in the developing embryo. Present in unfertilized and fertilized eggs. Lacks the C-terminal WD repeats. Ubiquitinated by XIAP/BIRC4. Belongs to the WD repeat Groucho/TLE family.