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- Title
Adaptive evolution and functional innovation of Populus-specific recently evolved micro RNAs.
- Authors
Xie, Jianbo; Yang, Xiaohui; Song, Yuepeng; Du, Qingzhang; Li, Ying; Chen, Jinhui; Zhang, Deqiang
- Abstract
Lineage-specific micro RNAs (mi RNAs) undergo rapid turnover during evolution; however, their origin and functional importance have remained controversial. Here, we examine the origin, evolution, and potential roles in local adaptation of Populus-specific mi RNAs, which originated after the recent salicoid-specific, whole-genome duplication., RNA sequencing was used to generate extensive, comparable mi RNA and gene expression data for six tissues. A natural population of Populus trichocarpa and closely related species were used to study the divergence rates, evolution, and adaptive variation of mi RNAs., Mi RNAs that originated in 5′ untranslated regions had higher expression levels and their expression showed high correlation with their host genes. Compared with conserved mi RNAs, a significantly higher proportion of Populus-specific mi RNAs appear to target genes that were duplicated in salicoids. Examination of single nucleotide polymorphisms in Populus-specific mi RNA precursors showed high amounts of population differentiation. We also characterized the newly emerged MIR6445 family, which could trigger the production of phased small interfering RNAs from NAC mRNAs, which encode a transcription factor with primary roles in a variety of plant developmental processes., Together, these observations provide evolutionary insights into the birth and potential roles of Populus-specific mi RNAs in genome maintenance, local adaptation, and functional innovation.
- Subjects
MICRORNA; PLANT genetics; PLANT genomes; RNA; GENE expression
- Publication
New Phytologist, 2017, Vol 213, Issue 1, p206
- ISSN
0028-646X
- Publication type
Article
- DOI
10.1111/nph.14046