Members of the trefoil family are characterized by having at least one copy of the trefoil motif, a 40-amino acid domain that contains three conserved disulfides. They are stable secretory proteins expressed in gastrointestinal mucosa. Their functions are not defined, but they may protect the mucosa from insults, stabilize the mucus layer, and affect healing of the epithelium. This gene, which is expressed in the gastric mucosa, has also been studied because of its expression in human tumors. This gene and two other related trefoil family member genes are found in a cluster on chromosome 21.
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Protein Aliases: Breast cancer estrogen-inducible protein; breast cancer estrogen-inducible sequence; gastrointestinal trefoil protein pS2; hP1.A; PNR-2; Polypeptide P1.A; Protein pS2; Trefoil factor 1
Gene Aliases: BCEI; D21S21; HP1.A; HPS2; pNR-2; PS2; TFF1
Molecular Function: intercellular signal molecule