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J. Virol., Mar 1996, 1512-1520, Vol 70, No. 3
E Sock, K Renner, D Feist, H Leger and M Wegner
Isolates of the human polyomavirus JC can be grouped as either PML-type or
archetype strains primarily on the basis of divergence in their regulatory
regions. Only PML-type viruses have so far been found to be associated with
the human demyelinating disease progressive multifocal leukoencephalopathy.
Here we have compared the functional properties of archetype and PML-type
regulatory regions with regard to DNA replication and viral gene
expression. No significant differences could be detected between archetype
and PML-type regions in their ability to direct episomal DNA replication in
the presence of JC virus T antigen. When viral gene expression was
examined, early- and late-gene promoters from all PML-type strains
exhibited a significantly higher activity in glial than in nonglial cells.
Surprisingly, archetype strain promoters were also preferentially active in
glial cells, although this effect was less pronounced than in PML-type
strains. Furthermore, all promoters from archetype strains reacted to the
presence of viral T antigen or the glial transcription factor Tst-1/Oct6 in
a manner similar to the promoters of the PML-type viral strain Mad-1.
Interestingly, T antigen and Tst-1/Oct6 were found to function in a
species-specific and cell-type-specific manner, respectively. We concluded
from our experiments that the differences in the regulatory regions cannot
account for the different biology of archetype and PML- type viral strains.
Copyright © 1996, American Society for Microbiology
Functional comparison of PML-type and archetype strains of JC virus
Zentrum fur Molekulare Neurobiologie, Universitat Hamburg, Germany.
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