TRAPPC10, also known as TMEM1 (transmembrane protein 1), EHOC1 (epilepsy holoprosencephaly candidate 1 protein) or GT334, is a widely expressed 1,259 amino acid protein that may function in vesicular transport. Despite its name, TRAPPC10 does not contain transmembrane domains. It is the human ortholog of the yeast Trs130 protein and its structure and function appears to be conserved. Localizing to the cis-Golgi apparatus, TRAPPC10 is believed to be involved in transport from the endoplasmic reticulum (ER) to the Golgi functioning as a component of the multisubunit transport protein particle (TRAPP) complex. Mutations in the gene encoding TRAPPC10 may be involved in autoimmune polyglandular disease type 1 or Unverricht-Lundborg disease, an autosomal recessive type of progressive myoclonic epilepsy.