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. 2021 Nov 10;34(2):784–801. doi: 10.1093/plcell/koab280

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© The Author(s) 2021. Published by Oxford University Press on behalf of American Society of Plant Biologists.

This is an Open Access article distributed under the terms of the Creative Commons Attribution License (https://creativecommons.org/licenses/by/4.0/), which permits unrestricted reuse, distribution, and reproduction in any medium, provided the original work is properly cited.

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Model for miRNome changes during pollen development. miRNA populations change during pollen development and are influenced at maturity by the increased presence of miR845, in line with the increased accumulation of AGO5. The lower part shows the distinct functionality of the two main miRNA effectors, AGO1 and AGO5. While AGO1 is able to target both genes and TEs, AGO5 mainly targets TEs due to its preferential loading of miR845a. Furthermore, AGO1 loading of miR845b (which is 22 nts in length) might induce the production of mobile TE-derived siRNAs. These secondary siRNAs might help to target other TEs in the SCs or might inhibit the establishment of DNA methylation via targeting of Pol IV transcripts.