In this study, the complete genomic nucleotide sequence of Chikungunya virus (CHIKV) strain S27 African prototype was determined and three 21 nucleotides repeated sequence elements (RSEs) at positions 11398-11418, 11533-11553, and 11620-11640 in the 3' untranslated region (3'UTR) were confirmed. In addition, the 3'UTRs of all CHIKV strains deposited in GenBank were analyzed. The results displayed that the majority of the CHIKV strains consisted of the three 21 nucleotides RSEs in the 3'UTRs, and the third RSE was the most conservative. The conservation of the three RSEs of 21 nucleotides within the 3'UTR of CHIKV genome may play an important role on the virus replication cycle.
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