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Journal of Virology, September 1998, p. 7510-7522, Vol. 72, No. 9
0022-538X/98/$04.00+0
Copyright © 1998, American Society for Microbiology. All rights reserved.

Identification of Specific Nucleotide Sequences within the Conserved 3'-SL in the Dengue Type 2 Virus Genome Required for Replication

Lingling Zeng,dagger Barry Falgout, and Lewis Markoff*

Laboratory of Vector-Borne Virus Diseases, Division of Viral Products, Center for Biologics Evaluation and Research, Food and Drug Administration, Bethesda, Maryland

Received 22 September 1997/Accepted 6 June 1998

The flavivirus genome is a positive-stranded ~11-kb RNA including 5' and 3' noncoding regions (NCR) of approximately 100 and 400 to 600 nucleotides (nt), respectively. The 3' NCR contains adjacent, thermodynamically stable, conserved short and long stem-and-loop structures (the 3'-SL), formed by the 3'-terminal ~100 nt. The nucleotide sequences within the 3'-SL are not well conserved among species. We examined the requirement for the 3'-SL in the context of dengue virus type 2 (DEN2) replication by mutagenesis of an infectious cDNA copy of a DEN2 genome. Genomic full-length RNA was transcribed in vitro and used to transfect monkey kidney cells. A substitution mutation, in which the 3'-terminal 93 nt constituting the wild-type (wt) DEN2 3'-SL sequence were replaced by the 96-nt sequence of the West Nile virus (WN) 3'-SL, was sublethal for virus replication. An analysis of the growth phenotypes of additional mutant viruses derived from RNAs containing DEN2-WN chimeric 3'-SL structures suggested that the wt DEN2 nucleotide sequence forming the bottom half of the long stem and loop in the 3'-SL was required for viability. One 7-bp substitution mutation in this domain resulted in a mutant virus that grew well in monkey kidney cells but was severely restricted in cultured mosquito cells. In contrast, transpositions of and/or substitutions in the wt DEN2 nucleotide sequence in the top half of the long stem and in the short stem and loop were relatively well tolerated, provided the stem-loop secondary structure was conserved.


* Corresponding author. Mailing address: Laboratory of Vector-Borne Virus Diseases, Division of Viral Products, Center for Biologics Evaluation and Research, FDA, Bldg. 29A, Rm. 1B17, 8800 Rockville Pike, Bethesda, MD 20892. Phone: (301) 827-1886. Fax: (301) 496-1810.

dagger Present address: Department of Medicine, Moses Maimonides Hospital, Brooklyn, N.Y.


Journal of Virology, September 1998, p. 7510-7522, Vol. 72, No. 9
0022-538X/98/$04.00+0
Copyright © 1998, American Society for Microbiology. All rights reserved.



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