Acts as a transcriptional corepressor for AR-mediated transactivation function. May act as a transcriptional regulator during spermatogenesis and, in particular, during meiotic division. Acts as a transcriptional coactivator for AR-mediated transactivation function. May act as a transcriptional regulator during spermatogenesis and, in particular, during meiotic division. Homodimer. Heterodimer of isoform 1 and isoform 2. Isoform 1 and isoform 2 interact with AR. Expressed in endocrine tissue. May be produced at very low levels due to a premature stop codon in the mRNA, leading to nonsense-mediated mRNA decay. Extended N-terminus. Contaminating sequence. Potential poly-A sequence starting in position 1214.