Human T-cell leukemia virus type 1 tax attenuates the ATM-mediated cellular DNA damage response
| Autor: | Susan J. Marriott, Elijahu Berkovich, Michael B. Kastan, Chandtip Chandhasin, Razvan I. Ducu |
|---|---|
| Rok vydání: | 2008 |
| Předmět: |
DNA re-replication
Genome instability DNA Replication Cell cycle checkpoint DNA Repair DNA repair DNA damage T-Lymphocytes Immunology Cell Cycle Proteins Ataxia Telangiectasia Mutated Proteins Biology Protein Serine-Threonine Kinases Microbiology Cell Line chemistry.chemical_compound Virology Humans Adaptor Proteins Signal Transducing Human T-lymphotropic virus 1 Tumor Suppressor Proteins DNA replication Nuclear Proteins Gene Products tax Cell biology MDC1 Virus-Cell Interactions DNA-Binding Proteins chemistry Insect Science Trans-Activators DNA |
| Zdroj: | Journal of virology. 82(14) |
| ISSN: | 1098-5514 |
| Popis: | Genomic instability, a hallmark of leukemic cells, is associated with malfunctioning cellular responses to DNA damage caused by defective cell cycle checkpoints and/or DNA repair. Adult T-cell leukemia, which can result from infection with human T-cell leukemia virus type 1 (HTLV-1), is associated with extensive genomic instability that has been attributed to the viral oncoprotein Tax. How Tax influences cellular responses to DNA damage to mediate genomic instability, however, remains unclear. Therefore, we investigated the effect of Tax on cellular pathways involved in recognition and repair of DNA double-strand breaks. Premature attenuation of ATM kinase activity and reduced association of MDC1 with repair foci were observed in Tax-expressing cells. Following ionizing radiation-induced S-phase checkpoint activation, Tax-expressing cells progressed more rapidly than non-Tax-expressing cells toward DNA replication. These results demonstrate that Tax expression may allow premature DNA replication in the presence of genomic lesions. Attempts to replicate in the presence of these lesions would result in gradual accumulation of mutations, leading to genome instability and cellular transformation. |
| Databáze: | OpenAIRE |
| Externí odkaz: |
|