AGR2
Encyclopedia
Anterior gradient homolog 2 (AGR2) is a human protein
Protein
Proteins are biochemical compounds consisting of one or more polypeptides typically folded into a globular or fibrous form, facilitating a biological function. A polypeptide is a single linear polymer chain of amino acids bonded together by peptide bonds between the carboxyl and amino groups of...

 originally discovered in Xenopus laevis, encoded for by the gene
Gene
A gene is a molecular unit of heredity of a living organism. It is a name given to some stretches of DNA and RNA that code for a type of protein or for an RNA chain that has a function in the organism. Living beings depend on genes, as they specify all proteins and functional RNA chains...

 of the same name. In Xenopus AGR2 plays a role in cement gland differentiation, however in human cancer cell lines high levels of AGR2 correlate with downregulation of the p53
P53
p53 , is a tumor suppressor protein that in humans is encoded by the TP53 gene. p53 is crucial in multicellular organisms, where it regulates the cell cycle and, thus, functions as a tumor suppressor that is involved in preventing cancer...

 response and AGR2 levels are elevated in the preneoplastic tissue Barrett's oesophagus.

Further reading

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