PMID: 2112460May 20, 1990Paper

A transcribed gene, containing a variable number of tandem repeats, codes for a human epithelial tumor antigen. cDNA cloning, expression of the transfected gene and over-expression in breast cancer tissue

European Journal of Biochemistry
M HareuveniI Keydar

Abstract

A monoclonal antibody, H23, that specifically recognizes a breast-tumor-associated antigen, was used to isolate a cDNA insert that codes for the antigenic epitope. Nucleotide sequencing of this cDNA, as well as a longer 850-bp cDNA insert, shows that they are composed of 60-bp (G + C)-rich tandem repeating units. The coding strand was determined and codes for a proline-rich 20-amino-acid repeat motif. A comparison of the highly conserved repeat unit with the deduced flanking amino acid sequences demonstrates conservation of specific subregions of the repeat consensus within the flanking amino acids. Hybridization of the 60-bp cDNA probe with RNAs extracted from a variety of primary and metastatic human tumors yields relatively high levels of hybrid with the breast carcinomas, as compared to lower hybrid levels with RNAs from other epithelial tumors. RNA extracted from breast tissue adjacent to the tumor or from benign breast tumors, demonstrates low or undetectable levels of hybridization. Probing Southern blots with the 60-bp repeat shows that the tumor antigen is highly polymorphic and contains a variable number of tandem repeats (VNTRs). The VNTR nature of the gene was confirmed by probing Southern blots with unique genomic ...Continue Reading

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