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Functional analysis of Kaposi's sarcoma-associated herpesvirus RTA in an RTA-depressed cell line
K Nishimura1, K Ueda, S Sakakibara
1Department of Microbiology, Osaka University Medical School, Osaka, Japan.
Journal of Human Virology
|June 26, 2002
Summary
Kaposi's sarcoma-associated herpesvirus (KSHV) RTA protein is crucial for viral DNA replication and lytic gene expression. An RTA-depressed cell line revealed RTA does not directly control late gene expression, challenging prior conclusions.
Area of Science:
- Virology
- Molecular Biology
- Herpesvirus Research
Background:
- Kaposi's sarcoma-associated herpesvirus (KSHV) open reading frame 50 (RTA) is a key viral transcriptional activator.
- RTA expression occurs during the immediate-early phase of KSHV reactivation.
Purpose of the Study:
- To investigate the role of RTA in KSHV reactivation and gene expression.
- To isolate and characterize an RTA-depressed cell line for functional studies.
Main Methods:
- Isolation of an RTA-depressed cell line (BLS50-4) from KSHV-infected BCBL-1 cells.
- Analysis of lytic gene expression, viral genome replication, and KSHV DNA release in BLS50-4 cells.
- Functional complementation by transfecting RTA into BLS50-4 cells.
Main Results:
- BLS50-4 cells showed reduced induction of RTA and some lytic genes, but not K8.1 and ORF65.
- KSHV genome replication and extracellular KSHV DNA release were significantly decreased.
- RTA transfection restored expression of K9 (vIRF) and ORF59, but not K8.1.
Conclusions:
- RTA is critical for KSHV DNA replication and the expression of several lytic genes.
- Late gene expression is not directly controlled by RTA, contrary to previous findings.
- The RTA-depressed cell line provides a valuable tool for dissecting KSHV replication mechanisms.