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    Keywords: RECEPTOR ; EXPRESSION ; tumor ; CELL ; human ; KINASE ; MODEL ; MODELS ; TYROSINE KINASE ; GENE ; GENES ; TUMORS ; MICE ; DNA ; FAMILY ; TISSUES ; BIOLOGY ; MEMBER ; MOLECULAR-BIOLOGY ; FORM ; ISOFORM ; MOUSE ; TRANSGENIC MICE ; PROGRESSION ; LYMPHOMA ; MALIGNANCIES ; MUTATION ; TUMOR PROGRESSION ; METASTASIS ; genetics ; COLORECTAL-CANCER ; DNA methylation ; LYMPHOCYTES ; MUTATIONS ; ADHESION ; B-CELLS ; ONCOGENE ; TRANSFORMATION ; Jun ; TRANSLOCATION ; REVEALS ; RECEPTORS ; METHYLATION ; heredity ; CHRONIC LYMPHOCYTIC-LEUKEMIA ; B-CELL LYMPHOMA ; HYPERMETHYLATION ; molecular biology ; molecular ; ONCOLOGY ; aberrant expression ; FAMILIES ; MALIGNANT PROGRESSION ; TYROSINE KINASES ; non-Hodgkin lymphoma ; SUBTYPES ; USA ; INVASIVENESS ; B-LYMPHOCYTES ; genomic ; B-CELL ; ENGLAND ; SET ; germinal center ; MULTIPLE GENES ; receptor tyrosine kinase ; RECEPTOR TYROSINE KINASES ; NON-HODGKIN-LYMPHOMA ; MYC ; DNA-METHYLATION ; scanning ; B cells ; COMPLEMENT ; ACTIVATING MUTATION ; EPHRINS ; TCL1 ; TCL1 EXPRESSION
    Abstract: Most human lymphomas originate from transformed germinal center (GC) B lymphocytes. While activating mutations and translocations of MYC, BCL2 and BCL6 promote specific GC lymphoma subtypes, other genetic and epigenetic modi. cations that contribute to malignant progression in the GC remain poorly defined. Recently, aberrant expression of the TCL1 proto-oncogene was identified in major GC lymphoma subtypes. TCL1 transgenic mice offer unique models of both aggressive GC and marginal zone B-cell lymphomas, further supporting a role for TCL1 in B-cell transformation. Here, restriction landmark genomic scanning was employed to discover tumor-associated epigenetic alterations in malignant GC and marginal zone B-cells in TCL1 transgenic mice. Multiple genes were identified that underwent DNA hypermethylation and decreased expression in TCL1 transgenic tumors. Further, we identified a secreted isoform of EPHA7, a member of the Eph family of receptor tyrosine kinases that are able to influence tumor invasiveness, metastasis and neovascularization. EPHA7 was hypermethylated and repressed in both mouse and human GC B-cell non-Hodgkin lymphomas, with the potential to influence tumor progression and spread. These data provide the first set of hypermethylated genes with the potential to complement TCL1-mediated GC B-cell transformation and spread
    Type of Publication: Journal article published
    PubMed ID: 17260020
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