CCDC109A, or Mitochondrial calcium uniporter, is a human gene encoded by MCU. It may also be known as: Calcium uniporter protein, mitochondrial; Coiled-coil domain-containing protein 109A; C10orf42. The encoded protein has an amino acid length of 351 and a mass of 39.9 kDa. Other isoforms may exist. CCDC109A is a member of the MCU (TC 1.A.77) family. Homologs of this gene exist in other organisms, including: Mouse, Rat, Zebrafish, Frog.