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Institut für Immunbiologie, Universität Freiburg, Stefan-Meier-Strasse 8, D-7800 Freiburg, Federal Republic of Germany [W. Z., B. O., F. R., S. v. K., J. A. T.]; Institut für Humangenetik und Anthropologie, Universität Freiburg, Albertstrasse 11, D-7800 Freiburg, Federal Republic of Germany [B. W., W. S.]; Medizinische Universitätsklinik Freiburg, Hugstetter Strasse 55, D-7800 Freiburg, Federal Republic of Germany [H-H. F]; and Beckman Research Institute of the City of Hope, Duarte, California [J. E. S.]
Carcinoembryonic antigen (CEA) is a glycoprotein which is important as a tumor marker for a number of human cancers. It is a member of a gene family comprising about 10 closely related genes. In order to characterize mRNAs transcribed from individual genes we have identified by DNA and RNA hybridization experiments, gene-specific sequences from the 3' noncoding regions of CEA, and of nonspecific cross-reacting antigen (NCA) mRNAs, which have been recently cloned. With these probes, CEA mRNAs with lengths of 3.5 and 3.0 kilobases and an NCA mRNA species of 2.5 kilobases were identified in various human tumors. A 2.2-kilobase mRNA species, however, could only be detected in leukocytes of patients with chronic myeloid leukemia by hybridization with a probe from the immunoglobulin-like repeat domain of CEA. This region is known to be very similar among the various members of the CEA gene family, and indeed the probe hybridizes with all four mRNA species. In situ hybridization with a cross-hybridizing probe from the NCA gene localized the members of the CEA gene family to the short and to the long arm of chromosome 19. In addition, a CEA cDNA probe was found to hybridize to the long arm of chromosome 19 only.
1 To whom requests for reprints should be addressed, at Institut für Immunbiologie, Stefan-Meier-Strasse 8, D-7800 Freiburg, Federal Republic of Germany.
Received 9/29/87. Revised 1/21/88. Accepted 1/29/88.
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