Differences between de novo generated and conserved miRNA genes in O. sativa and A. thaliana.

at-test.bNumber of pairing bases/hairpin length.cNumber of siRNAs encoded by miRNA precursor.dPercentage of miRNA precursor encoding more than one miRNA.ePercentage of miRNA genes located in coding gene regions.fAverage promoter (TATA box) and enhancer number of a miRNA gene.gSimple sequence repeats number adjacent to miRNA gene within 1 kb region.hMean of all gene expression intensity is 403.67 and 6.14 in O. sativa and A. thaliana respectively.iWatson-Crick pairing number of miRNA cleaving site (10 and 11 nucleotides) on miRNA/target duplex.jOrthologous number of miRNA gene in 14 plant species in miRbase.kmiRNA expression data, polymorphism site data and DNA methylation data only have A. thaliana data.lPre-miRNA polymorphic site number/pre-miRNA length. Polymorphic site density of the whole genome is 6.66%.mPre-miRNA DNA methylation site number/pre-miRNA length. Methylcytosine density of the whole genome is 0.98%.n1 kb upstream of pre-miRNA DNA methylation site number/1000.

a. 碱基配对数目/发夹茎长度
c. 微小RNA（miRNA，microRNA）前体编码的小干扰RNA（siRNA，small interfering RNA）数目
d. 编码多个微小RNA的前体微小RNA（pre-miRNA）占比
e. 位于编码基因区域内的微小RNA基因占比
f. 单个微小RNA基因的启动子（TATA box）与增强子平均数量
g. 微小RNA基因上下游1 kb范围内的简单序列重复数目
h. 水稻（O. sativa，Oryza sativa）与拟南芥（A. thaliana，Arabidopsis thaliana）的全基因表达强度均值分别为403.67和6.14
i. 微小RNA-靶标双链中，微小RNA切割位点（第10、11位核苷酸）的沃森-克里克碱基配对数目
j. miRbase数据库中14种植物的微小RNA基因直系同源数目
k. 微小RNA表达数据、多态性位点数据与DNA甲基化数据仅包含拟南芥（A. thaliana）的数据
l. 前体微小RNA多态性位点数与前体微小RNA长度的比值，全基因组多态性位点密度为6.66%
m. 前体微小RNA DNA甲基化位点数与前体微小RNA长度的比值，全基因组甲基化胞嘧啶密度为0.98%
n. 前体微小RNA上游1 kb区域内的DNA甲基化位点数每1000 bp