FAM60A, also known as Protein FAM60A, or Tera protein homolog, and encoded by the gene FAM60A/C12orf14, is a subunit of the Sin3 deacetylase complex (Sin3/HDAC) that is important for the repression of genes. The SIN3A-HDAC complex deacetylates histones thereby repressing gene transcription. FAM60A specifically impacts genes encoding components of the TGF-beta signaling pathway and promoters of important proteins like cyclin D1. FAM60A activity peaks during G1 and S phases of the cell cycle and is up regulated in many carcinoma and tumor tissues. Additionally, loss of FAM60A leads to a change in cell morphology, an increase in cell migration, increased histone acetylation at the cyclin D1 promoter and elevated levels of cyclin D1 mRNA and protein. Furthermore, depletion of FAM60A altered the periodic association of HDAC1 with the cyclin D1 promoter, increased cyclin D1 expression at all cell cycle phases, and caused premature S phase entry.