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1 Division of Vector-Borne Viral Diseases, Center for Infectious Diseases, Centers for Disease Control, Public Health Service, U.S. Department of Health and Human Services, P.O. Box 2087, Fort Collins, Colorado 80522
and2 Division of Infectious Diseases, The Childrens' Hospital, Harvard Medical School, Boston, Massachusetts 02115, U.S.A.
The structural protein-coding genomic regions of dengue virus type 1 (DEN-1) strains representing three distinct topotypes (Thailand, Philippines and Caribbean) were cloned and sequenced. In addition the envelope (E) nucleotide sequences of two recent Caribbean topotype DEN-1 isolates were obtained by direct RNA sequencing. The nucleotide sequence of the DEN-1 viruses in the structural gene region was found to be highly conserved with greater than 95% nucleotide sequence homology and with less than 4% change in the amino acid sequence. Although there was a less than 2% change in the nucleotide sequence of DEN-1 E proteins, strains could be differentiated by the clusters of nucleotide changes. Furthermore, the deduced amino acid changes in the E protein were clustered primarily within the proposed immunologically reactive regions. Genomic nucleotide sequence comparisons did not define geographical or virulence markers but located unique clusters of nucleotide/amino acid changes for each of the three topotypes of DEN-1 viruses examined.
Keywords: dengue 1 virus, nucleotide sequence, genetic variation
Received 12 December 1988;
accepted 17 March 1989.
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