Abstract
GC content of small RNA-generating sites and their flanking sequences in Arabidopsis thaliana and rice was systematically analyzed in silico. High GC content fluctuation (GCF) is observed at the borders of sRNA sites, while the GCF within sRNA sites is low. Furthermore, the GC content along sequences of some miniature inverted-repeat transposable element (MITE) families coincides with the abundance of MITE-derived small RNAs. The GCF within tasiRNA clusters is negatively correlated with its phasing score. We conclude that high GC content and low GCF could increase the expression of small RNA. Our results provide further insights on small RNA expression, which may be applied to improve the silencing efficiency of RNAi and virus-induced gene silencing.
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