SECRETED AND CELL SURFACE GENES EXPRESSED IN BENIGN AND MALIGNANT COLORECTAL TUMORS
    131.
    发明公开
    SECRETED AND CELL SURFACE GENES EXPRESSED IN BENIGN AND MALIGNANT COLORECTAL TUMORS 有权
    分泌细胞表面基因所表达良性和恶性大肠肿瘤

    公开(公告)号:EP1430071A1

    公开(公告)日:2004-06-23

    申请号:EP02773302.1

    申请日:2002-09-09

    IPC分类号: C07H21/04

    摘要: Serial analysis of gene expression (SAGE) was used to identify transcripts encoding secreted or cell-surface proteins that were expressed in benign and malignant tumors of the colorectum. A total of 290,394 tags were analyzed from normal, adenomatous and cancerous colonic epithelium. Of the 21,343 different transcripts observed, 957 were found to be differentially expressed between normal and adenoma or between normal and cancer. Forty-nine transcripts were elevated ≥ 20-fold in adenomas, 40 transcripts were elevated ≥ 20-fold in cancers, and nine transcripts were elevated ≥ 20-fold in both. Product of six these nine transcripts (TGFBI, LYS, RDP, MIC-1, REGA, and DEHL) were predicted to be secreted or to reside on the cell surface and these were analyzed in more detail. The abnormal expression levels predicted by SAGE were confirmed by quantitative PCR analyses of each of these six genes. Moreover, the cell types responsible for the elevated expression were identified by in situ hybridization and by PCR analyses of epithelial cells immunoaffinity purified from primary tumors.

    DIGITAL AMPLIFICATION
    133.
    发明公开
    DIGITAL AMPLIFICATION 有权
    DIGITALE AMPLIFIZIERUNG

    公开(公告)号:EP1255856A2

    公开(公告)日:2002-11-13

    申请号:EP00952304.4

    申请日:2000-07-31

    IPC分类号: C12Q1/68

    摘要: The identification of pre-defined mutations expected to be present in a minor fraction of a cell population is important for a variety of basic research and clinical applications. The exponential, analog nature of the polymerase chain reaction is transformed into a linear, digital signal suitable for this purpose. Single molecules can be isolated by dilution and individually amplified; each product is then separately analyzed for the presence of mutations. The process provides a reliable and quantitative measure of the proportion of variant sequences within a DNA sample.

    C-MYC IS ACTIVATED BY BETA-CATENIN AND TCF-4
    135.
    发明公开
    C-MYC IS ACTIVATED BY BETA-CATENIN AND TCF-4 有权
    C-MYC被激活通过β-catenin和TCF-4

    公开(公告)号:EP1104475A1

    公开(公告)日:2001-06-06

    申请号:EP99943741.1

    申请日:1999-08-20

    IPC分类号: C12N15/63 C12Q1/68 C07K14/27

    摘要: The APC tumor suppressor protein binds to β-catenin, a protein recently shown to interact with Tcf/Lef transcription factors. Here, the gene encoding a Tcf family member that is expressed in colonic epithelium (hTcf-4) was cloned and characterized. hTcf-4 transactivates transcription only when associated with β-catenin. Nuclei of APC-/- colon carcinoma cells were found to contain a stable β-catenin-hTCF-4 complex that was constitutively active, as measured by transcription of a Tcf reporter gene. Reintroduction of APC removed β-catenin from hTcf4 and abrogated the transcriptional transactivation. Constitutive transcription of TCF target genes, caused by loss of APC function, may be a crucial event in the early transformation of colonic epithelium. It is also shown here that the products of mutant APC genes found in colorectal tumors are defective in regulating β-catenin/Tcf-4 transcriptional activation. Furthermore, colorectal tumors with intact APC genes were shown to contain subtle activating mutations of β-catenin that altered functionally significant phosphorylation sites. These results indicate that regulation of β-catenin is critical to APC"s tumor suppressive effect and that this regulation can be circumvented by mutations in either APC or β-catenin.

    MEANS FOR DETECTING FAMILIAL COLON CANCER (FCC)
    138.
    发明公开
    MEANS FOR DETECTING FAMILIAL COLON CANCER (FCC) 失效
    PROCEDURE用于确定所述家庭结肠癌

    公开(公告)号:EP0698123A1

    公开(公告)日:1996-02-28

    申请号:EP94917285.0

    申请日:1994-05-02

    IPC分类号: C12N15 C07K14 C12Q1 A61K38

    摘要: Markers of chromosome 2 are associated with cancer predisposition, as shown by linkage analysis, in a significant fraction of families with a history of colon and other cancers. Tumors from these patients progressed through the same series of accumulated mutations in oncogenes and tumor suppressor genes found in non-familial cases, but showed no losses of heterozygosity for the linked chromosome 2 markers. DNA from the tumors (but not normal tissues) in most familial cases revealed a consistent and distinct abnormality: rearrangemnets in short repeated sequences throughout their genomes. This abnormality suggests that a large number of replication errors had occurred during tumor development. Methods are presented for detecting the presence of the gene which predisposes people to have a colon and other tumors and for utilizing this information for diagnostic, prognostic, and preventive purposes. DNA markers useful for such methods are also described.