Campus Units

Ecology, Evolution and Organismal Biology, Genome Informatics Facility

Document Type

Article

Publication Version

Submitted Manuscript

Publication Date

2-28-2018

Journal or Book Title

bioRxiv

First Page

272708

DOI

10.1101/272708

Abstract

Gene duplication is an important driver for the evolution of new genes and protein functions. Duplication of DNA-dependent RNA polymerase (Pol) II subunits within plants led to the emergence of RNA Pol IV and V complexes, each of which possess unique functions necessary for RNA-directed DNA Methylation. Comprehensive identification of Pol V subunit orthologs across the monocot radiation revealed a duplication of the largest two subunits within the grasses (Poaceae), including critical cereal crops. These paralogous Pol subunits display sequence conservation within catalytic domains, but their carboxy terminal domains differ in length and character of the Ago-binding platform, suggesting unique functional interactions. Phylogenetic analysis of the catalytic region indicates positive selection on one paralog following duplication, consistent with retention via neofunctionalization. Positive selection on residue pairs that are predicted to interact between subunits suggests that paralogous subunits have evolved specific assembly partners. Additional Pol subunits as well as Pol-interacting proteins also possess grass-specific paralogs, supporting the hypothesis that a novel Pol complex with distinct function has evolved in the grass family, Poaceae.

Comments

This is a pre-print of the article Trujillo, Joshua T., Arun S. Seetharam, Matthew B. Hufford, Mark A. Beilstein, and Rebecca A. Mosher. "Evidence for a unique DNA-dependent RNA polymerase in cereal crops." bioRxiv (2018): 272708. DOI: 10.1101/272708. Posted with permission.

Creative Commons License

Creative Commons Attribution-Noncommercial-No Derivative Works 4.0 License
This work is licensed under a Creative Commons Attribution-Noncommercial-No Derivative Works 4.0 License.

Copyright Owner

The Authors

Language

en

File Format

application/pdf

Published Version

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