24-nt reproductive phasiRNAs are broadly present in angiosperms

Rui Xia (), Chengjie Chen, Suresh Pokhrel, Wuqiang Ma, Kun Huang, Parth Patel, Fuxi Wang, Jing Xu, Zhongchi Liu, Jianguo Li and Blake C. Meyers ()
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Rui Xia: South China Agricultural University
Chengjie Chen: South China Agricultural University
Suresh Pokhrel: Donald Danforth Plant Science Center
Wuqiang Ma: South China Agricultural University
Kun Huang: University of Delaware
Parth Patel: University of Delaware
Fuxi Wang: University of Maryland
Jing Xu: South China Agricultural University
Zhongchi Liu: University of Maryland
Jianguo Li: South China Agricultural University
Blake C. Meyers: Donald Danforth Plant Science Center

Nature Communications, 2019, vol. 10, issue 1, 1-8

Abstract: Abstract Small RNAs are key regulators in plant growth and development. One subclass, phased siRNAs (phasiRNAs) require a trigger microRNA for their biogenesis. In grasses, two pathways yield abundant phasiRNAs during anther development; miR2275 triggers one class, 24-nt phasiRNAs, coincident with meiosis, while a second class of 21-nt phasiRNAs are present in premeiotic anthers. Here we report that the 24-nt phasiRNA pathway is widely present in flowering plants, indicating that 24-nt reproductive phasiRNAs likely originated with the evolutionary emergence of anthers. Deep comparative genomic analyses demonstrated that this miR2275/24-nt phasiRNA pathway is widely present in eudicots plants, however, it is absent in legumes and in the model plant Arabidopsis, demonstrating a dynamic evolutionary history of this pathway. In Solanaceae species, 24-nt phasiRNAs were observed, but the miR2275 trigger is missing and some loci displaying 12-nt phasing. Both the miR2275-triggered and Solanaceae 24-nt phasiRNAs are enriched in meiotic stages, implicating these phasiRNAs in anther and/or pollen development, a spatiotemporal pattern consistent in all angiosperm lineages that deploy them.

Date: 2019
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DOI: 10.1038/s41467-019-08543-0

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