Identification of a tissue-specific putative transcription factor in breast tissue by serological screening of a breast cancer library.

Application of SEREX (serological analysis of recombinant tumor cDNA expression libraries) to different tumor types has led to the identification of several categories of human tumor antigens. In this study, the analysis of a breast cancer library with autologous patient serum led to the isolation of seven genes, designated NY-BR-1 through NY-BR-7. NY-BR-1, representing 6 of 14 clones isolated, showed tissue-restricted mRNA expression in breast and testis but not in 13 other normal tissues tested. Among tumor specimens, NY-BR-1 mRNA expression was found in 21 of 25 breast cancers but in only 2 of 82 nonmammary tumors. Structural analysis of NY-BR-1 cDNA and the corresponding genomic sequences in the recently released working draft of human genome indicated that NY-BR-1 is composed of 37 exons and has an open reading frame of 4.0-4.2 kb, encoding a peptide of Mr 150,000-160,000. A bipartite nuclear localization signal motif indicates a nuclear site for NY-BR-1, and the presence of a bZIP site (DNA-binding site followed by leucine zipper motif) suggests that NY-BR-1 is a transcription factor. Additional structural features include five tandem ankyrin repeats, implying a role for NY-BR-1 in protein-protein interactions. NY-BR-1 thus represents a breast tissue-specific putative transcription factor with autoimmunogenicity in breast cancer patients. In addition to NY-BR-1, a homologous gene, NY-BR-1.1, was identified in this study. NY-BR-1.1 shares 54% amino acid homology with NY-BR-1 and also shows tissue-restricted mRNA expression. However, unlike NY-BR-1, NY-BR-1.1 mRNA is expressed in brain, in addition to breast and testis. The exon structure of NY-BR-1.1 remains to be defined. Using human genome database, NY-BR-1 was localized to chromosome 10p11-p12, and NY-BR-1.1 was tentatively localized to chromosome 9.

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