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. 2014 Aug;20(8):1195–1209. doi: 10.1261/rna.044644.114

FIGURE 6.

FIGURE 6.

High miRNA flux within testis-restricted cluster. (A) De novo miRNA birth is enriched within testes-restricted clusters compared with somatically expressed clusters. This enrichment is observed after normalizing to account for cluster size as measured by total number of conserved D. melanogaster miRNA orthologs. (B) Emergence of new miRNA within the mir-982-894 cluster via de novo hairpin emergence and gene duplication. A mir-982 subcluster containing three miRNAs (two mir-982 copies and mir-2582) duplicated in the D. simulans and D. sechellia lineage. Within D. sechellia, the duplicated copies remained similar; however, those of D. simulans experience gene loss and rapid sequence evolution. (C) De novo emergence of testis-restricted cluster in D. virilis. The 17 sense-strand miRNAs of this large cluster are testis-restricted (D) and interspersed among tRNA genes, while antisense members are predominantly expressed in other somatic tissues.