PMS1 encodes the human gene, PMS1 homolog 1, mismatch repair system component. It may also be known as: PMS1 protein homolog 1; DNA mismatch repair protein PMS1; HNPCC3; PMS1 postmeiotic segregation increased 1 (S. cerevisiae); PMSL1; hPMS1. The encoded protein has an amino acid length of 932 and a mass of 105.8 kDa. Other isoforms may exist. PMS1 is a member of the DNA mismatch repair MutL/HexB family. Homologs of this gene exist in other organisms, including: Mouse, Yeast, Rat, Arabidopsis, Zebrafish, Frog, Chicken.