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JOURNAL ARTICLE
RESEARCH SUPPORT, U.S. GOV'T, P.H.S.
Molecular cloning of the CA125 ovarian cancer antigen: identification as a new mucin, MUC16.
Journal of Biological Chemistry 2001 July 21
CA125 is an ovarian cancer antigen that is the basis for a widely used serum assay for the monitoring of patients with ovarian cancer; however, detailed information on its biochemical and molecular nature is lacking. We now report the isolation of a long, but partial, cDNA that corresponds to the CA125 antigen. A rabbit polyclonal antibody produced to purified CA125 antigen was used to screen a lambdaZAP cDNA library from OVCAR-3 cells in Escherichia coli. The longest insert from the 54 positive isolated clones had a 5797-base pair sequence containing a stop codon and a poly(A) sequence but no clear 5' initiation sequence. The deduced amino acid sequence has many of the attributes of a mucin molecule and was designated CA125/MUC16 (gene MUC16). These features include a high serine, threonine, and proline content in an N-terminal region of nine partially conserved tandem repeats (156 amino acids each) and a C-terminal region non-tandem repeat sequence containing a possible transmembrane region and a potential tyrosine phosphorylation site. Northern blotting showed that the level of MUC16 mRNA correlated with the expression of CA125 in a panel of cell lines. The molecular cloning of the CA125 antigen will lead to a better understanding of its role in ovarian cancer.
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