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Journal of Virology, January 1999, p. 482-494, Vol. 73, No. 1
0022-538X/99/$04.00+0
Copyright © 1999, American Society for Microbiology. All rights reserved.
Focal Transcriptional Activity of Murine
Cytomegalovirus during Latency in the Lungs
Sabine K.
Kurz,
Maria
Rapp,
Hans-Peter
Steffens,
Natascha K. A.
Grzimek,
Susanne
Schmalz, and
Matthias J.
Reddehase*
Institute for Virology, Johannes
Gutenberg-University, Mainz, Germany
Received 4 August 1998/Accepted 15 October 1998
Interstitial pneumonia is a frequent and critical manifestation of
human cytomegalovirus (CMV) disease in immunocompromised patients, in
particular in recipients of bone marrow transplantation. Previous work
in the murine CMV infection model has identified the lungs as a major
organ site of CMV latency and recurrence. It was open to question
whether the viral genome is transcriptionally silent or active during
latency. Transcription could be latency associated and thus be part of
the latency phenotype. Alternatively, transcriptional activity could
reflect episodes of reactivation. We demonstrate here that
transcription of the immediate-early (IE) transcription unit
ie1-ie3 selectively generates
ie1-specific transcripts during latency. Notably, while the
latent viral DNA was found to be evenly distributed in the lungs,
transcription was focal and randomly distributed. This finding
indicates that IE transcription is not a feature inherent to murine CMV
latency but rather reflects foci of primordial reactivation. However, this reactivation did not initiate productive infection, since ie3 gene mRNA specifying the essential transactivator IE3
of murine CMV early gene expression was not detectable. Accordingly,
transcripts encoding gB were absent during latency. By contrast, during
induced virus recurrence, IE-phase transcription switched from focal to generalized and ie3-specific transcripts were generated.
These data imply that latency and recurrence are regulated not only at
the IE promoter-enhancer and that there exists an additional checkpoint
at the level of precursor RNA splicing. We propose that focal
transcription reflects random episodes of nonproductive reactivation
that get terminated before IE3 is expressed and ignites the productive cycle.
*
Corresponding author. Mailing address: Institute for
Virology, Johannes Gutenberg-University, Hochhaus am Augustusplatz,
55101 Mainz, Germany. Phone: 49-6131-173650. Fax: 49-6131-395604. E-mail: Matthias.Reddehase{at}uni-mainz.de.

Present address: Institute for Anatomy, Johannes
Gutenberg-University, 55099 Mainz,
Germany.
Journal of Virology, January 1999, p. 482-494, Vol. 73, No. 1
0022-538X/99/$04.00+0
Copyright © 1999, American Society for Microbiology. All rights reserved.
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