Abstract
We used an in vitro template-dependent replicase assay (D. Chen, C. Zeng, M. Wentz, M. Gorziglia, M. Estes, and R. Ramig. J. Virol. 68:7030-7039, 1994) to identify the cis-acting signals required for replication of a genome segment 9 template from the group A rotavirus strain OSU. The replicase phenotypes for a panel of templates with internal deletions or 3'-terminal truncations indicated that no essential replication signals were present within the open reading frame and that key elements were present in the 5' and 3' noncoding regions. Chimeric constructs containing portions of viral sequence ligated to a nonviral backbone were generated to further map the regions required for in vitro replication of segment 9. The data from these constructs showed that the 3'-terminal seven nucleotides of the segment 9 mRNA provided the minimum requirement for replication (minimal promoter). Analysis of additional chimeric templates demonstrated that sequences capable of enhancing replication from the minimal promoter were located immediately upstream of the minimal promoter and at the extreme 5' terminus of the template. Mutational analysis of the minimal promoter revealed that the 3'-terminal -CC residues are required for efficient replication. Comparison of the replication levels for templates with guanosines and uridines at nucleotides -4 to -6 from the 3' terminus compared with levels for templates containing neither of these residues at these positions indicated that either or both residues must be present in this region for efficient replication in vitro.
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