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. Isoform 1 and isoform 2 are highly expressed in testis, moderately expressed in adrenal gland and uterus and faintly expressed in brain, kidney and liver. Isoform 1 is expressed more in adrenal gland, uterus and liver than isoform 2 is. Expression during testicular development of isoform 1 and isoform 2 is restricted to spermatocytes at the pachytene stage of meiotic prophase and to round and elongated spermatids. Truncated N-terminus. Truncated N-terminus. Truncated N-terminus.