Stability of AML1 (core) site enhancer mutations in T lymphomas induced by attenuated SL3-3 murine leukemia virus mutants
| Autor: | Annette Balle Sørensen, H W Amtoft, J Schmidt, A Luz, Finn Skou Pedersen, C Bareil |
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| Rok vydání: | 1997 |
| Předmět: |
Virus Integration
viruses Molecular Sequence Data Immunology Mutant Lymphoma T-Cell Vaccines Attenuated Core binding factor Microbiology Proto-Oncogene Proteins c-myc Mice Proviruses Proto-Oncogene Proteins hemic and lymphatic diseases Virology Enhancer binding Murine leukemia virus Animals Humans Enhancer Elements (Genetics) Binding site Enhancer Transcription factor Leukemia Experimental Base Sequence biology Wild type DNA Neoplasm biology.organism_classification Molecular biology DNA-Binding Proteins Leukemia Virus Murine Tumor Virus Infections Enhancer Elements Genetic Insect Science Core Binding Factor Alpha 2 Subunit Mutation Research Article Retroviridae Infections Transcription Factors |
| Zdroj: | Aarhus University Amtoft, H W, Sørensen, A B, Bareil, C, Schmidt, J, Luz, A & Pedersen, F S 1997, ' Stability of AML1 (core) site enhancer mutations in T lymphomas induced by attenuated SL3-3 murine leukemia virus mutants. ', Journal of Virology, vol. 71, no. 7, pp. 5080-7 . Scopus-Elsevier |
| ISSN: | 1098-5514 0022-538X |
| Popis: | Udgivelsesdato: 1997-Jul Murine retrovirus SL3-3 is highly T lymphomagenic. Its pathogenic properties are determined by the transcriptional enhancer of the U3 repeat region which shows preferential activity in T cells. Within the U3 repeats, the major determinant of T-cell specificity has been mapped to binding sites for the AML1 transcription factor family (also known as the core binding factor [CBF], polyomavirus enhancer binding protein 2 [PEBP2], and SL3-3 enhancer factor 1 [SEF-1]). SL3-3 viruses with AML1 site mutations have lost a major determinant of T-cell-specific enhancer function but have been found to retain a lymphomagenic potential, although disease induction is slower than for the SL3-3 wild type. To compare the specificities and mechanisms of disease induction of wild-type and mutant viruses, we have examined lymphomas induced by mutant viruses harboring transversions of three consecutive base pairs critical to AML1 site function (B. Hallberg, J. Schmidt, A. Luz, F. S. Pedersen, and T. Grundström. J. Virol. 65:4177-4181, 1991). Our results show that the mutated AML1 sites are genetically stable during lymphomagenesis and that ecotropic provirus numbers in DNA of tumors induced by wild-type and mutant viruses fall within the same range. Moreover, proviruses were found to be integrated at the c-myc locus in similar proportions of wild-type and mutant SL3-3-induced tumors, and the mutated AML1 sites of proviruses at c-myc are unaltered. In some cases, however, including one c-myc-integrated provirus, a single-base pair change was detected in a second, weaker AML1 binding site. By DNA rearrangement analysis of the T-cell receptor beta-locus, tumors induced by the AML1 site mutants are found to be of the T-cell type. Thus, although the AML1 site mutants have weakened T-cell-specific enhancers they are T-lymphomagenic, and wild-type- and mutant-virus-induced tumor DNAs are similar with respect to the number of overall ecotropic and c-myc-integrated clonal proviruses. The SL3-3 wild-type and AML1 site mutant viruses may therefore induce disease by similar mechanisms. |
| Databáze: | OpenAIRE |
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