[No authors listed]
Nipah virus (NiV) is a nonsegmented, single-stranded, negative-sense RNA virus belonging to the genus Henipavirus, family Paramyxoviridae. NiV causes acute encephalitis and respiratory disease in humans, is associated with high mortality, and poses a threat in southern Asia. The genomes of henipaviruses are about 18,246 nucleotides (nt) long, which is longer than those of other paramyxoviruses (around 15,384 nt). This difference is caused by the noncoding RNA region, particularly the 3' untranslated region (UTR), which occupies more than half of the noncoding RNA region. To determine the function(s) of the NiV noncoding RNA region, we investigated the effects of NiV on reporter gene expression. The NiV N (nt 1 to 100) demonstrated strong repressor activity associated with hnRNP D protein binding to that region. Mutation of the hnRNP D binding site or knockdown of hnRNP D resulted in increased expression of the NiV N duanyu3 reporter. Our findings suggest that NiV N expression is repressed by hnRNP D through the NiV N duanyu3 and demonstrate the involvement of posttranscriptional regulation in the NiV life cycle. To the best of our knowledge, this provides the first report of the functions of the NiV noncoding RNA region.
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