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Layered Expression Scanning: Rapid Molecular Profiling of Tumor Samples

Pathogenetics Unit, Laboratory of Pathology, National Cancer Institute, Bethesda, Maryland 20892 [C. R. E., G. V. B., M. R. E-B.], and Howard Hughes Medical Institute-National Institutes of Health Research Scholars Program, Bethesda, Maryland 20892 [C. R. E.]

Layered expression scanning is a new approach to comprehensive molecular analysis of tumor samples that uses a layered array of capture membranes coupled to antibodies or DNA sequences to perform multiplex protein or mRNA analysis. Cell or tissue samples are transferred through a series of individual capture layers, each linked to a separate antibody or DNA sequence. As the biomolecules traverse the membrane set, each targeted protein or mRNA is specifically captured by the layer containing its antibody or cDNA sequence. The two-dimensional relationship of the cell populations is maintained during the transfer process, thereby producing a molecular profile of each cell type present. Reduction-to-practice of the technique is demonstrated by analysis of prostate-specific antigen (PSA) protein, gelatinase A protein, and POV1 (PB39) cDNA. As layered expression scanning technology progresses, we envision a laboratory method that will have multiple applications for high-throughput molecular profiling of normal and tumor samples.

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