TU3A, or Family with sequence similarity 107 member A, is a human gene encoded by FAM107A. It may also be known as: Protein FAM107A; Down-regulated in renal cell carcinoma 1; Protein TU3A; DRR1; family with sequence similarity 107, member A. The encoded protein has an amino acid length of 144 and a mass of 17.5 kDa. Other isoforms may exist. TU3A is a member of the FAM107 family. Homologs of this gene exist in other organisms, including: Mouse, Rat, Zebrafish, Frog, Chicken.