encodes a C2H2 zinc finger protein with transactivation and DNA-binding activity. This gene has been shown to exhibit antiproliferative activities and is a tumor suppressor gene candidate. Many transcript variants encoding two different isoforms have been found for this gene.The deduced 667-amino acid protein contains 7 C2H2 zinc fingers in its N-terminal half. Northern blot analysis of several mouse tissues detected highest Zac1 expression in pituitary.Rat and human LOT1 share 67.7% amino acid identity overall, with 85.5% identity in the N-terminal zinc finger region. Northern blot analysis detected multiple LOT1 transcripts in all human tissues examined, including spleen, thymus, prostate, testis, ovary, intestine, colon, and leukocytes. Highest expression was detected in ovary.