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Available structures
PDB Ortholog search: PDBe RCSB
Aliases TACSTD2, EGP-1, EGP1, GA733-1, GA7331, GP50, M1S1, TROP2, tumor-associated calcium signal transducer 2
External IDs MGI: 1861606 HomoloGene: 1763 GeneCards: TACSTD2
RNA expression pattern
PBB GE TACSTD2 202287 s at fs.png

PBB GE TACSTD2 202286 s at fs.png
More reference expression data
Species Human Mouse
RefSeq (mRNA)



RefSeq (protein)



Location (UCSC) Chr 1: 58.58 – 58.58 Mb Chr 6: 67.53 – 67.54 Mb
PubMed search [1] [2]
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Tumor-associated calcium signal transducer 2, also known as Trop-2 and as epithelial glycoprotein-1 antigen (EGP-1),[3] is a protein that in humans is encoded by the TACSTD2 gene.[4][5][6]

This intronless gene encodes a carcinoma-associated antigen defined by the monoclonal antibody GA733. This antigen is a member of a family including at least two type I membrane proteins. It transduces an intracellular calcium signal and acts as a cell surface receptor.

Mutations of this gene result in gelatinous drop-like corneal dystrophy, an autosomal recessive disorder characterized by severe corneal amyloidosis leading to blindness.[6]

This antigen is the target of sacituzumab govitecan, an antibody-drug conjugate.


  1. ^ "Human PubMed Reference:". 
  2. ^ "Mouse PubMed Reference:". 
  3. ^ Immunomedics Awarded Fast Track Designation by FDA for Sacituzumab Govitecan (IMMU-132) for Triple-Negative Breast Cancer Therapy [1]
  4. ^ Linnenbach AJ, Seng BA, Wu S, Robbins S, Scollon M, Pyrc JJ, Druck T, Huebner K (Apr 1993). "Retroposition in a family of carcinoma-associated antigen genes". Mol Cell Biol. 13 (3): 1507–15. PMC 359462Freely accessible. PMID 8382772. 
  5. ^ Calabrese G, Crescenzi C, Morizio E, Palka G, Guerra E, Alberti S (Apr 2001). "Assignment of TACSTD1 (alias TROP1, M4S1) to human chromosome 2p21 and refinement of mapping of TACSTD2 (alias TROP2, M1S1) to human chromosome 1p32 by in situ hybridization". Cytogenet Cell Genet. 92 (1-2): 164–5. doi:10.1159/000056891. PMID 11306819. 
  6. ^ a b "Entrez Gene: TACSTD2 tumor-associated calcium signal transducer 2". 

Further reading[edit]